/* GNU/Linux native-dependent code for debugging multiple forks.
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/* GNU/Linux native-dependent code for debugging multiple forks.
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Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010
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Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010
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Free Software Foundation, Inc.
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Free Software Foundation, Inc.
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This file is part of GDB.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "defs.h"
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#include "arch-utils.h"
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#include "arch-utils.h"
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#include "inferior.h"
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#include "inferior.h"
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#include "regcache.h"
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#include "regcache.h"
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#include "gdbcmd.h"
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#include "gdbcmd.h"
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#include "infcall.h"
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#include "infcall.h"
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#include "objfiles.h"
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#include "objfiles.h"
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#include "gdb_assert.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include "gdb_string.h"
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#include "linux-fork.h"
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#include "linux-fork.h"
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#include "linux-nat.h"
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#include "linux-nat.h"
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#include <sys/ptrace.h>
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#include <sys/ptrace.h>
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#include "gdb_wait.h"
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#include "gdb_wait.h"
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#include <sys/param.h>
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#include <sys/param.h>
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#include "gdb_dirent.h"
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#include "gdb_dirent.h"
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#include <ctype.h>
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#include <ctype.h>
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struct fork_info *fork_list;
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struct fork_info *fork_list;
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static int highest_fork_num;
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static int highest_fork_num;
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/* Prevent warning from -Wmissing-prototypes. */
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/* Prevent warning from -Wmissing-prototypes. */
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extern void _initialize_linux_fork (void);
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extern void _initialize_linux_fork (void);
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/* Fork list data structure: */
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/* Fork list data structure: */
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struct fork_info
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struct fork_info
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{
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{
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struct fork_info *next;
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struct fork_info *next;
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ptid_t ptid;
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ptid_t ptid;
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int num; /* Convenient handle (GDB fork id) */
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int num; /* Convenient handle (GDB fork id) */
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struct regcache *savedregs; /* Convenient for info fork, saves
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struct regcache *savedregs; /* Convenient for info fork, saves
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having to actually switch contexts. */
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having to actually switch contexts. */
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int clobber_regs; /* True if we should restore saved regs. */
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int clobber_regs; /* True if we should restore saved regs. */
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off_t *filepos; /* Set of open file descriptors' offsets. */
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off_t *filepos; /* Set of open file descriptors' offsets. */
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int maxfd;
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int maxfd;
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};
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};
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/* Fork list methods: */
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/* Fork list methods: */
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int
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int
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forks_exist_p (void)
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forks_exist_p (void)
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{
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{
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return (fork_list != NULL);
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return (fork_list != NULL);
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}
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}
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/* Add a fork to the internal fork list. */
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/* Add a fork to the internal fork list. */
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struct fork_info *
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struct fork_info *
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add_fork (pid_t pid)
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add_fork (pid_t pid)
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{
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{
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struct fork_info *fp;
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struct fork_info *fp;
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if (fork_list == NULL && pid != PIDGET (inferior_ptid))
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if (fork_list == NULL && pid != PIDGET (inferior_ptid))
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{
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{
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/* Special case -- if this is the first fork in the list
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/* Special case -- if this is the first fork in the list
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(the list is hitherto empty), and if this new fork is
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(the list is hitherto empty), and if this new fork is
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NOT the current inferior_ptid, then add inferior_ptid
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NOT the current inferior_ptid, then add inferior_ptid
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first, as a special zeroeth fork id. */
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first, as a special zeroeth fork id. */
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highest_fork_num = -1;
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highest_fork_num = -1;
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add_fork (PIDGET (inferior_ptid)); /* safe recursion */
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add_fork (PIDGET (inferior_ptid)); /* safe recursion */
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}
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}
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fp = XZALLOC (struct fork_info);
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fp = XZALLOC (struct fork_info);
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fp->ptid = ptid_build (pid, pid, 0);
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fp->ptid = ptid_build (pid, pid, 0);
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fp->num = ++highest_fork_num;
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fp->num = ++highest_fork_num;
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fp->next = fork_list;
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fp->next = fork_list;
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fork_list = fp;
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fork_list = fp;
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return fp;
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return fp;
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}
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}
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static void
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static void
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free_fork (struct fork_info *fp)
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free_fork (struct fork_info *fp)
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{
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{
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/* Notes on step-resume breakpoints: since this is a concern for
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/* Notes on step-resume breakpoints: since this is a concern for
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threads, let's convince ourselves that it's not a concern for
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threads, let's convince ourselves that it's not a concern for
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forks. There are two ways for a fork_info to be created. First,
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forks. There are two ways for a fork_info to be created. First,
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by the checkpoint command, in which case we're at a gdb prompt
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by the checkpoint command, in which case we're at a gdb prompt
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and there can't be any step-resume breakpoint. Second, by a fork
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and there can't be any step-resume breakpoint. Second, by a fork
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in the user program, in which case we *may* have stepped into the
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in the user program, in which case we *may* have stepped into the
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fork call, but regardless of whether we follow the parent or the
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fork call, but regardless of whether we follow the parent or the
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child, we will return to the same place and the step-resume
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child, we will return to the same place and the step-resume
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breakpoint, if any, will take care of itself as usual. And
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breakpoint, if any, will take care of itself as usual. And
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unlike threads, we do not save a private copy of the step-resume
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unlike threads, we do not save a private copy of the step-resume
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breakpoint -- so we're OK. */
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breakpoint -- so we're OK. */
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if (fp)
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if (fp)
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{
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{
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if (fp->savedregs)
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if (fp->savedregs)
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regcache_xfree (fp->savedregs);
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regcache_xfree (fp->savedregs);
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if (fp->filepos)
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if (fp->filepos)
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xfree (fp->filepos);
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xfree (fp->filepos);
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xfree (fp);
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xfree (fp);
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}
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}
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}
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}
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static void
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static void
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delete_fork (ptid_t ptid)
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delete_fork (ptid_t ptid)
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{
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{
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struct fork_info *fp, *fpprev;
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struct fork_info *fp, *fpprev;
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fpprev = NULL;
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fpprev = NULL;
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for (fp = fork_list; fp; fpprev = fp, fp = fp->next)
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for (fp = fork_list; fp; fpprev = fp, fp = fp->next)
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if (ptid_equal (fp->ptid, ptid))
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if (ptid_equal (fp->ptid, ptid))
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break;
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break;
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if (!fp)
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if (!fp)
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return;
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return;
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if (fpprev)
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if (fpprev)
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fpprev->next = fp->next;
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fpprev->next = fp->next;
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else
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else
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fork_list = fp->next;
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fork_list = fp->next;
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free_fork (fp);
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free_fork (fp);
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/* Special case: if there is now only one process in the list,
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/* Special case: if there is now only one process in the list,
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and if it is (hopefully!) the current inferior_ptid, then
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and if it is (hopefully!) the current inferior_ptid, then
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remove it, leaving the list empty -- we're now down to the
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remove it, leaving the list empty -- we're now down to the
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default case of debugging a single process. */
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default case of debugging a single process. */
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if (fork_list != NULL && fork_list->next == NULL &&
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if (fork_list != NULL && fork_list->next == NULL &&
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ptid_equal (fork_list->ptid, inferior_ptid))
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ptid_equal (fork_list->ptid, inferior_ptid))
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{
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{
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/* Last fork -- delete from list and handle as solo process
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/* Last fork -- delete from list and handle as solo process
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(should be a safe recursion). */
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(should be a safe recursion). */
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delete_fork (inferior_ptid);
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delete_fork (inferior_ptid);
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}
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}
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}
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}
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/* Find a fork_info by matching PTID. */
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/* Find a fork_info by matching PTID. */
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static struct fork_info *
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static struct fork_info *
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find_fork_ptid (ptid_t ptid)
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find_fork_ptid (ptid_t ptid)
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{
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{
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struct fork_info *fp;
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struct fork_info *fp;
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for (fp = fork_list; fp; fp = fp->next)
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for (fp = fork_list; fp; fp = fp->next)
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if (ptid_equal (fp->ptid, ptid))
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if (ptid_equal (fp->ptid, ptid))
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return fp;
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return fp;
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return NULL;
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return NULL;
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}
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}
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/* Find a fork_info by matching ID. */
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/* Find a fork_info by matching ID. */
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static struct fork_info *
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static struct fork_info *
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find_fork_id (int num)
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find_fork_id (int num)
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{
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{
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struct fork_info *fp;
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struct fork_info *fp;
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for (fp = fork_list; fp; fp = fp->next)
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for (fp = fork_list; fp; fp = fp->next)
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if (fp->num == num)
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if (fp->num == num)
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return fp;
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return fp;
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return NULL;
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return NULL;
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}
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}
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/* Find a fork_info by matching pid. */
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/* Find a fork_info by matching pid. */
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extern struct fork_info *
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extern struct fork_info *
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find_fork_pid (pid_t pid)
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find_fork_pid (pid_t pid)
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{
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{
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struct fork_info *fp;
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struct fork_info *fp;
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for (fp = fork_list; fp; fp = fp->next)
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for (fp = fork_list; fp; fp = fp->next)
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if (pid == ptid_get_pid (fp->ptid))
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if (pid == ptid_get_pid (fp->ptid))
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return fp;
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return fp;
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return NULL;
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return NULL;
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}
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}
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static ptid_t
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static ptid_t
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fork_id_to_ptid (int num)
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fork_id_to_ptid (int num)
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{
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{
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struct fork_info *fork = find_fork_id (num);
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struct fork_info *fork = find_fork_id (num);
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if (fork)
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if (fork)
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return fork->ptid;
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return fork->ptid;
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else
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else
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return pid_to_ptid (-1);
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return pid_to_ptid (-1);
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}
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}
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static void
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static void
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init_fork_list (void)
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init_fork_list (void)
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{
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{
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struct fork_info *fp, *fpnext;
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struct fork_info *fp, *fpnext;
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if (!fork_list)
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if (!fork_list)
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return;
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return;
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for (fp = fork_list; fp; fp = fpnext)
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for (fp = fork_list; fp; fp = fpnext)
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{
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{
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fpnext = fp->next;
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fpnext = fp->next;
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free_fork (fp);
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free_fork (fp);
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}
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}
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fork_list = NULL;
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fork_list = NULL;
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}
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}
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/* Fork list <-> gdb interface. */
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/* Fork list <-> gdb interface. */
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/* Utility function for fork_load/fork_save.
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/* Utility function for fork_load/fork_save.
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Calls lseek in the (current) inferior process. */
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Calls lseek in the (current) inferior process. */
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static off_t
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static off_t
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call_lseek (int fd, off_t offset, int whence)
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call_lseek (int fd, off_t offset, int whence)
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{
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{
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char exp[80];
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char exp[80];
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snprintf (&exp[0], sizeof (exp), "lseek (%d, %ld, %d)",
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snprintf (&exp[0], sizeof (exp), "lseek (%d, %ld, %d)",
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fd, (long) offset, whence);
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fd, (long) offset, whence);
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return (off_t) parse_and_eval_long (&exp[0]);
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return (off_t) parse_and_eval_long (&exp[0]);
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}
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}
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/* Load infrun state for the fork PTID. */
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/* Load infrun state for the fork PTID. */
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static void
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static void
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fork_load_infrun_state (struct fork_info *fp)
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fork_load_infrun_state (struct fork_info *fp)
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{
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{
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extern void nullify_last_target_wait_ptid ();
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extern void nullify_last_target_wait_ptid ();
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int i;
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int i;
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linux_nat_switch_fork (fp->ptid);
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linux_nat_switch_fork (fp->ptid);
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if (fp->savedregs && fp->clobber_regs)
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if (fp->savedregs && fp->clobber_regs)
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regcache_cpy (get_current_regcache (), fp->savedregs);
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regcache_cpy (get_current_regcache (), fp->savedregs);
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registers_changed ();
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registers_changed ();
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reinit_frame_cache ();
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reinit_frame_cache ();
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stop_pc = regcache_read_pc (get_current_regcache ());
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stop_pc = regcache_read_pc (get_current_regcache ());
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nullify_last_target_wait_ptid ();
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nullify_last_target_wait_ptid ();
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/* Now restore the file positions of open file descriptors. */
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/* Now restore the file positions of open file descriptors. */
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if (fp->filepos)
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if (fp->filepos)
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{
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{
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for (i = 0; i <= fp->maxfd; i++)
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for (i = 0; i <= fp->maxfd; i++)
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if (fp->filepos[i] != (off_t) -1)
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if (fp->filepos[i] != (off_t) -1)
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call_lseek (i, fp->filepos[i], SEEK_SET);
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call_lseek (i, fp->filepos[i], SEEK_SET);
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/* NOTE: I can get away with using SEEK_SET and SEEK_CUR because
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/* NOTE: I can get away with using SEEK_SET and SEEK_CUR because
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this is native-only. If it ever has to be cross, we'll have
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this is native-only. If it ever has to be cross, we'll have
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to rethink this. */
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to rethink this. */
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}
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}
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}
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}
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/* Save infrun state for the fork PTID.
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/* Save infrun state for the fork PTID.
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Exported for use by linux child_follow_fork. */
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Exported for use by linux child_follow_fork. */
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static void
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static void
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fork_save_infrun_state (struct fork_info *fp, int clobber_regs)
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fork_save_infrun_state (struct fork_info *fp, int clobber_regs)
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{
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{
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char path[MAXPATHLEN];
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char path[MAXPATHLEN];
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struct dirent *de;
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struct dirent *de;
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DIR *d;
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DIR *d;
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if (fp->savedregs)
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if (fp->savedregs)
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regcache_xfree (fp->savedregs);
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regcache_xfree (fp->savedregs);
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fp->savedregs = regcache_dup (get_current_regcache ());
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fp->savedregs = regcache_dup (get_current_regcache ());
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fp->clobber_regs = clobber_regs;
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fp->clobber_regs = clobber_regs;
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if (clobber_regs)
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if (clobber_regs)
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{
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{
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/* Now save the 'state' (file position) of all open file descriptors.
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/* Now save the 'state' (file position) of all open file descriptors.
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Unfortunately fork does not take care of that for us... */
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Unfortunately fork does not take care of that for us... */
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snprintf (path, MAXPATHLEN, "/proc/%ld/fd", (long) PIDGET (fp->ptid));
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snprintf (path, MAXPATHLEN, "/proc/%ld/fd", (long) PIDGET (fp->ptid));
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if ((d = opendir (path)) != NULL)
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if ((d = opendir (path)) != NULL)
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{
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{
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long tmp;
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long tmp;
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|
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fp->maxfd = 0;
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fp->maxfd = 0;
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while ((de = readdir (d)) != NULL)
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while ((de = readdir (d)) != NULL)
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{
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{
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/* Count open file descriptors (actually find highest
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/* Count open file descriptors (actually find highest
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numbered). */
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numbered). */
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tmp = strtol (&de->d_name[0], NULL, 10);
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tmp = strtol (&de->d_name[0], NULL, 10);
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if (fp->maxfd < tmp)
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if (fp->maxfd < tmp)
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fp->maxfd = tmp;
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fp->maxfd = tmp;
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}
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}
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/* Allocate array of file positions. */
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/* Allocate array of file positions. */
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fp->filepos = xrealloc (fp->filepos,
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fp->filepos = xrealloc (fp->filepos,
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(fp->maxfd + 1) * sizeof (*fp->filepos));
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(fp->maxfd + 1) * sizeof (*fp->filepos));
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|
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/* Initialize to -1 (invalid). */
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/* Initialize to -1 (invalid). */
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for (tmp = 0; tmp <= fp->maxfd; tmp++)
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for (tmp = 0; tmp <= fp->maxfd; tmp++)
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fp->filepos[tmp] = -1;
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fp->filepos[tmp] = -1;
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|
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/* Now find actual file positions. */
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/* Now find actual file positions. */
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rewinddir (d);
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rewinddir (d);
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while ((de = readdir (d)) != NULL)
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while ((de = readdir (d)) != NULL)
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if (isdigit (de->d_name[0]))
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if (isdigit (de->d_name[0]))
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{
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{
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tmp = strtol (&de->d_name[0], NULL, 10);
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tmp = strtol (&de->d_name[0], NULL, 10);
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fp->filepos[tmp] = call_lseek (tmp, 0, SEEK_CUR);
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fp->filepos[tmp] = call_lseek (tmp, 0, SEEK_CUR);
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}
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}
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closedir (d);
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closedir (d);
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}
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}
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}
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}
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}
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}
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|
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/* Kill 'em all, let God sort 'em out... */
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/* Kill 'em all, let God sort 'em out... */
|
|
|
void
|
void
|
linux_fork_killall (void)
|
linux_fork_killall (void)
|
{
|
{
|
/* Walk list and kill every pid. No need to treat the
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/* Walk list and kill every pid. No need to treat the
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current inferior_ptid as special (we do not return a
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current inferior_ptid as special (we do not return a
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status for it) -- however any process may be a child
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status for it) -- however any process may be a child
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or a parent, so may get a SIGCHLD from a previously
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or a parent, so may get a SIGCHLD from a previously
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killed child. Wait them all out. */
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killed child. Wait them all out. */
|
struct fork_info *fp;
|
struct fork_info *fp;
|
pid_t pid, ret;
|
pid_t pid, ret;
|
int status;
|
int status;
|
|
|
for (fp = fork_list; fp; fp = fp->next)
|
for (fp = fork_list; fp; fp = fp->next)
|
{
|
{
|
pid = PIDGET (fp->ptid);
|
pid = PIDGET (fp->ptid);
|
do {
|
do {
|
/* Use SIGKILL instead of PTRACE_KILL because the former works even
|
/* Use SIGKILL instead of PTRACE_KILL because the former works even
|
if the thread is running, while the later doesn't. */
|
if the thread is running, while the later doesn't. */
|
kill (pid, SIGKILL);
|
kill (pid, SIGKILL);
|
ret = waitpid (pid, &status, 0);
|
ret = waitpid (pid, &status, 0);
|
/* We might get a SIGCHLD instead of an exit status. This is
|
/* We might get a SIGCHLD instead of an exit status. This is
|
aggravated by the first kill above - a child has just
|
aggravated by the first kill above - a child has just
|
died. MVS comment cut-and-pasted from linux-nat. */
|
died. MVS comment cut-and-pasted from linux-nat. */
|
} while (ret == pid && WIFSTOPPED (status));
|
} while (ret == pid && WIFSTOPPED (status));
|
}
|
}
|
init_fork_list (); /* Clear list, prepare to start fresh. */
|
init_fork_list (); /* Clear list, prepare to start fresh. */
|
}
|
}
|
|
|
/* The current inferior_ptid has exited, but there are other viable
|
/* The current inferior_ptid has exited, but there are other viable
|
forks to debug. Delete the exiting one and context-switch to the
|
forks to debug. Delete the exiting one and context-switch to the
|
first available. */
|
first available. */
|
|
|
void
|
void
|
linux_fork_mourn_inferior (void)
|
linux_fork_mourn_inferior (void)
|
{
|
{
|
/* Wait just one more time to collect the inferior's exit status.
|
/* Wait just one more time to collect the inferior's exit status.
|
Do not check whether this succeeds though, since we may be
|
Do not check whether this succeeds though, since we may be
|
dealing with a process that we attached to. Such a process will
|
dealing with a process that we attached to. Such a process will
|
only report its exit status to its original parent. */
|
only report its exit status to its original parent. */
|
int status;
|
int status;
|
|
|
waitpid (ptid_get_pid (inferior_ptid), &status, 0);
|
waitpid (ptid_get_pid (inferior_ptid), &status, 0);
|
|
|
/* OK, presumably inferior_ptid is the one who has exited.
|
/* OK, presumably inferior_ptid is the one who has exited.
|
We need to delete that one from the fork_list, and switch
|
We need to delete that one from the fork_list, and switch
|
to the next available fork. */
|
to the next available fork. */
|
delete_fork (inferior_ptid);
|
delete_fork (inferior_ptid);
|
|
|
/* There should still be a fork - if there's only one left,
|
/* There should still be a fork - if there's only one left,
|
delete_fork won't remove it, because we haven't updated
|
delete_fork won't remove it, because we haven't updated
|
inferior_ptid yet. */
|
inferior_ptid yet. */
|
gdb_assert (fork_list);
|
gdb_assert (fork_list);
|
|
|
fork_load_infrun_state (fork_list);
|
fork_load_infrun_state (fork_list);
|
printf_filtered (_("[Switching to %s]\n"),
|
printf_filtered (_("[Switching to %s]\n"),
|
target_pid_to_str (inferior_ptid));
|
target_pid_to_str (inferior_ptid));
|
|
|
/* If there's only one fork, switch back to non-fork mode. */
|
/* If there's only one fork, switch back to non-fork mode. */
|
if (fork_list->next == NULL)
|
if (fork_list->next == NULL)
|
delete_fork (inferior_ptid);
|
delete_fork (inferior_ptid);
|
}
|
}
|
|
|
/* The current inferior_ptid is being detached, but there are other
|
/* The current inferior_ptid is being detached, but there are other
|
viable forks to debug. Detach and delete it and context-switch to
|
viable forks to debug. Detach and delete it and context-switch to
|
the first available. */
|
the first available. */
|
|
|
void
|
void
|
linux_fork_detach (char *args, int from_tty)
|
linux_fork_detach (char *args, int from_tty)
|
{
|
{
|
/* OK, inferior_ptid is the one we are detaching from. We need to
|
/* OK, inferior_ptid is the one we are detaching from. We need to
|
delete it from the fork_list, and switch to the next available
|
delete it from the fork_list, and switch to the next available
|
fork. */
|
fork. */
|
|
|
if (ptrace (PTRACE_DETACH, PIDGET (inferior_ptid), 0, 0))
|
if (ptrace (PTRACE_DETACH, PIDGET (inferior_ptid), 0, 0))
|
error (_("Unable to detach %s"), target_pid_to_str (inferior_ptid));
|
error (_("Unable to detach %s"), target_pid_to_str (inferior_ptid));
|
|
|
delete_fork (inferior_ptid);
|
delete_fork (inferior_ptid);
|
|
|
/* There should still be a fork - if there's only one left,
|
/* There should still be a fork - if there's only one left,
|
delete_fork won't remove it, because we haven't updated
|
delete_fork won't remove it, because we haven't updated
|
inferior_ptid yet. */
|
inferior_ptid yet. */
|
gdb_assert (fork_list);
|
gdb_assert (fork_list);
|
|
|
fork_load_infrun_state (fork_list);
|
fork_load_infrun_state (fork_list);
|
|
|
if (from_tty)
|
if (from_tty)
|
printf_filtered (_("[Switching to %s]\n"),
|
printf_filtered (_("[Switching to %s]\n"),
|
target_pid_to_str (inferior_ptid));
|
target_pid_to_str (inferior_ptid));
|
|
|
/* If there's only one fork, switch back to non-fork mode. */
|
/* If there's only one fork, switch back to non-fork mode. */
|
if (fork_list->next == NULL)
|
if (fork_list->next == NULL)
|
delete_fork (inferior_ptid);
|
delete_fork (inferior_ptid);
|
}
|
}
|
|
|
/* Fork list <-> user interface. */
|
/* Fork list <-> user interface. */
|
|
|
static void
|
static void
|
delete_checkpoint_command (char *args, int from_tty)
|
delete_checkpoint_command (char *args, int from_tty)
|
{
|
{
|
ptid_t ptid;
|
ptid_t ptid;
|
|
|
if (!args || !*args)
|
if (!args || !*args)
|
error (_("Requires argument (checkpoint id to delete)"));
|
error (_("Requires argument (checkpoint id to delete)"));
|
|
|
ptid = fork_id_to_ptid (parse_and_eval_long (args));
|
ptid = fork_id_to_ptid (parse_and_eval_long (args));
|
if (ptid_equal (ptid, minus_one_ptid))
|
if (ptid_equal (ptid, minus_one_ptid))
|
error (_("No such checkpoint id, %s"), args);
|
error (_("No such checkpoint id, %s"), args);
|
|
|
if (ptid_equal (ptid, inferior_ptid))
|
if (ptid_equal (ptid, inferior_ptid))
|
error (_("\
|
error (_("\
|
Please switch to another checkpoint before deleting the current one"));
|
Please switch to another checkpoint before deleting the current one"));
|
|
|
if (ptrace (PTRACE_KILL, PIDGET (ptid), 0, 0))
|
if (ptrace (PTRACE_KILL, PIDGET (ptid), 0, 0))
|
error (_("Unable to kill pid %s"), target_pid_to_str (ptid));
|
error (_("Unable to kill pid %s"), target_pid_to_str (ptid));
|
|
|
if (from_tty)
|
if (from_tty)
|
printf_filtered (_("Killed %s\n"), target_pid_to_str (ptid));
|
printf_filtered (_("Killed %s\n"), target_pid_to_str (ptid));
|
|
|
delete_fork (ptid);
|
delete_fork (ptid);
|
}
|
}
|
|
|
static void
|
static void
|
detach_checkpoint_command (char *args, int from_tty)
|
detach_checkpoint_command (char *args, int from_tty)
|
{
|
{
|
ptid_t ptid;
|
ptid_t ptid;
|
|
|
if (!args || !*args)
|
if (!args || !*args)
|
error (_("Requires argument (checkpoint id to detach)"));
|
error (_("Requires argument (checkpoint id to detach)"));
|
|
|
ptid = fork_id_to_ptid (parse_and_eval_long (args));
|
ptid = fork_id_to_ptid (parse_and_eval_long (args));
|
if (ptid_equal (ptid, minus_one_ptid))
|
if (ptid_equal (ptid, minus_one_ptid))
|
error (_("No such checkpoint id, %s"), args);
|
error (_("No such checkpoint id, %s"), args);
|
|
|
if (ptid_equal (ptid, inferior_ptid))
|
if (ptid_equal (ptid, inferior_ptid))
|
error (_("\
|
error (_("\
|
Please switch to another checkpoint before detaching the current one"));
|
Please switch to another checkpoint before detaching the current one"));
|
|
|
if (ptrace (PTRACE_DETACH, PIDGET (ptid), 0, 0))
|
if (ptrace (PTRACE_DETACH, PIDGET (ptid), 0, 0))
|
error (_("Unable to detach %s"), target_pid_to_str (ptid));
|
error (_("Unable to detach %s"), target_pid_to_str (ptid));
|
|
|
if (from_tty)
|
if (from_tty)
|
printf_filtered (_("Detached %s\n"), target_pid_to_str (ptid));
|
printf_filtered (_("Detached %s\n"), target_pid_to_str (ptid));
|
|
|
delete_fork (ptid);
|
delete_fork (ptid);
|
}
|
}
|
|
|
/* Print information about currently known checkpoints. */
|
/* Print information about currently known checkpoints. */
|
|
|
static void
|
static void
|
info_checkpoints_command (char *arg, int from_tty)
|
info_checkpoints_command (char *arg, int from_tty)
|
{
|
{
|
struct gdbarch *gdbarch = get_current_arch ();
|
struct gdbarch *gdbarch = get_current_arch ();
|
struct frame_info *cur_frame;
|
struct frame_info *cur_frame;
|
struct symtab_and_line sal;
|
struct symtab_and_line sal;
|
struct symtab *cur_symtab;
|
struct symtab *cur_symtab;
|
struct fork_info *fp;
|
struct fork_info *fp;
|
int cur_line;
|
int cur_line;
|
ULONGEST pc;
|
ULONGEST pc;
|
int requested = -1;
|
int requested = -1;
|
struct fork_info *printed = NULL;
|
struct fork_info *printed = NULL;
|
|
|
if (arg && *arg)
|
if (arg && *arg)
|
requested = (int) parse_and_eval_long (arg);
|
requested = (int) parse_and_eval_long (arg);
|
|
|
for (fp = fork_list; fp; fp = fp->next)
|
for (fp = fork_list; fp; fp = fp->next)
|
{
|
{
|
if (requested > 0 && fp->num != requested)
|
if (requested > 0 && fp->num != requested)
|
continue;
|
continue;
|
|
|
printed = fp;
|
printed = fp;
|
if (ptid_equal (fp->ptid, inferior_ptid))
|
if (ptid_equal (fp->ptid, inferior_ptid))
|
{
|
{
|
printf_filtered ("* ");
|
printf_filtered ("* ");
|
pc = regcache_read_pc (get_current_regcache ());
|
pc = regcache_read_pc (get_current_regcache ());
|
}
|
}
|
else
|
else
|
{
|
{
|
printf_filtered (" ");
|
printf_filtered (" ");
|
pc = regcache_read_pc (fp->savedregs);
|
pc = regcache_read_pc (fp->savedregs);
|
}
|
}
|
printf_filtered ("%d %s", fp->num, target_pid_to_str (fp->ptid));
|
printf_filtered ("%d %s", fp->num, target_pid_to_str (fp->ptid));
|
if (fp->num == 0)
|
if (fp->num == 0)
|
printf_filtered (_(" (main process)"));
|
printf_filtered (_(" (main process)"));
|
printf_filtered (_(" at "));
|
printf_filtered (_(" at "));
|
fputs_filtered (paddress (gdbarch, pc), gdb_stdout);
|
fputs_filtered (paddress (gdbarch, pc), gdb_stdout);
|
|
|
sal = find_pc_line (pc, 0);
|
sal = find_pc_line (pc, 0);
|
if (sal.symtab)
|
if (sal.symtab)
|
{
|
{
|
char *tmp = strrchr (sal.symtab->filename, '/');
|
char *tmp = strrchr (sal.symtab->filename, '/');
|
|
|
if (tmp)
|
if (tmp)
|
printf_filtered (_(", file %s"), tmp + 1);
|
printf_filtered (_(", file %s"), tmp + 1);
|
else
|
else
|
printf_filtered (_(", file %s"), sal.symtab->filename);
|
printf_filtered (_(", file %s"), sal.symtab->filename);
|
}
|
}
|
if (sal.line)
|
if (sal.line)
|
printf_filtered (_(", line %d"), sal.line);
|
printf_filtered (_(", line %d"), sal.line);
|
if (!sal.symtab && !sal.line)
|
if (!sal.symtab && !sal.line)
|
{
|
{
|
struct minimal_symbol *msym;
|
struct minimal_symbol *msym;
|
|
|
msym = lookup_minimal_symbol_by_pc (pc);
|
msym = lookup_minimal_symbol_by_pc (pc);
|
if (msym)
|
if (msym)
|
printf_filtered (", <%s>", SYMBOL_LINKAGE_NAME (msym));
|
printf_filtered (", <%s>", SYMBOL_LINKAGE_NAME (msym));
|
}
|
}
|
|
|
putchar_filtered ('\n');
|
putchar_filtered ('\n');
|
}
|
}
|
if (printed == NULL)
|
if (printed == NULL)
|
{
|
{
|
if (requested > 0)
|
if (requested > 0)
|
printf_filtered (_("No checkpoint number %d.\n"), requested);
|
printf_filtered (_("No checkpoint number %d.\n"), requested);
|
else
|
else
|
printf_filtered (_("No checkpoints.\n"));
|
printf_filtered (_("No checkpoints.\n"));
|
}
|
}
|
}
|
}
|
|
|
/* The PID of the process we're checkpointing. */
|
/* The PID of the process we're checkpointing. */
|
static int checkpointing_pid = 0;
|
static int checkpointing_pid = 0;
|
|
|
int
|
int
|
linux_fork_checkpointing_p (int pid)
|
linux_fork_checkpointing_p (int pid)
|
{
|
{
|
return (checkpointing_pid == pid);
|
return (checkpointing_pid == pid);
|
}
|
}
|
|
|
static void
|
static void
|
checkpoint_command (char *args, int from_tty)
|
checkpoint_command (char *args, int from_tty)
|
{
|
{
|
struct objfile *fork_objf;
|
struct objfile *fork_objf;
|
struct gdbarch *gdbarch;
|
struct gdbarch *gdbarch;
|
struct target_waitstatus last_target_waitstatus;
|
struct target_waitstatus last_target_waitstatus;
|
ptid_t last_target_ptid;
|
ptid_t last_target_ptid;
|
struct value *fork_fn = NULL, *ret;
|
struct value *fork_fn = NULL, *ret;
|
struct fork_info *fp;
|
struct fork_info *fp;
|
pid_t retpid;
|
pid_t retpid;
|
struct cleanup *old_chain;
|
struct cleanup *old_chain;
|
long i;
|
long i;
|
|
|
/* Make the inferior fork, record its (and gdb's) state. */
|
/* Make the inferior fork, record its (and gdb's) state. */
|
|
|
if (lookup_minimal_symbol ("fork", NULL, NULL) != NULL)
|
if (lookup_minimal_symbol ("fork", NULL, NULL) != NULL)
|
fork_fn = find_function_in_inferior ("fork", &fork_objf);
|
fork_fn = find_function_in_inferior ("fork", &fork_objf);
|
if (!fork_fn)
|
if (!fork_fn)
|
if (lookup_minimal_symbol ("_fork", NULL, NULL) != NULL)
|
if (lookup_minimal_symbol ("_fork", NULL, NULL) != NULL)
|
fork_fn = find_function_in_inferior ("fork", &fork_objf);
|
fork_fn = find_function_in_inferior ("fork", &fork_objf);
|
if (!fork_fn)
|
if (!fork_fn)
|
error (_("checkpoint: can't find fork function in inferior."));
|
error (_("checkpoint: can't find fork function in inferior."));
|
|
|
gdbarch = get_objfile_arch (fork_objf);
|
gdbarch = get_objfile_arch (fork_objf);
|
ret = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
|
ret = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
|
|
|
/* Tell linux-nat.c that we're checkpointing this inferior. */
|
/* Tell linux-nat.c that we're checkpointing this inferior. */
|
old_chain = make_cleanup_restore_integer (&checkpointing_pid);
|
old_chain = make_cleanup_restore_integer (&checkpointing_pid);
|
checkpointing_pid = PIDGET (inferior_ptid);
|
checkpointing_pid = PIDGET (inferior_ptid);
|
|
|
ret = call_function_by_hand (fork_fn, 0, &ret);
|
ret = call_function_by_hand (fork_fn, 0, &ret);
|
do_cleanups (old_chain);
|
do_cleanups (old_chain);
|
if (!ret) /* Probably can't happen. */
|
if (!ret) /* Probably can't happen. */
|
error (_("checkpoint: call_function_by_hand returned null."));
|
error (_("checkpoint: call_function_by_hand returned null."));
|
|
|
retpid = value_as_long (ret);
|
retpid = value_as_long (ret);
|
get_last_target_status (&last_target_ptid, &last_target_waitstatus);
|
get_last_target_status (&last_target_ptid, &last_target_waitstatus);
|
if (from_tty)
|
if (from_tty)
|
{
|
{
|
int parent_pid;
|
int parent_pid;
|
|
|
printf_filtered (_("checkpoint: fork returned pid %ld.\n"),
|
printf_filtered (_("checkpoint: fork returned pid %ld.\n"),
|
(long) retpid);
|
(long) retpid);
|
if (info_verbose)
|
if (info_verbose)
|
{
|
{
|
parent_pid = ptid_get_lwp (last_target_ptid);
|
parent_pid = ptid_get_lwp (last_target_ptid);
|
if (parent_pid == 0)
|
if (parent_pid == 0)
|
parent_pid = ptid_get_pid (last_target_ptid);
|
parent_pid = ptid_get_pid (last_target_ptid);
|
printf_filtered (_(" gdb says parent = %ld.\n"),
|
printf_filtered (_(" gdb says parent = %ld.\n"),
|
(long) parent_pid);
|
(long) parent_pid);
|
}
|
}
|
}
|
}
|
|
|
fp = find_fork_pid (retpid);
|
fp = find_fork_pid (retpid);
|
if (!fp)
|
if (!fp)
|
error (_("Failed to find new fork"));
|
error (_("Failed to find new fork"));
|
fork_save_infrun_state (fp, 1);
|
fork_save_infrun_state (fp, 1);
|
}
|
}
|
|
|
static void
|
static void
|
linux_fork_context (struct fork_info *newfp, int from_tty)
|
linux_fork_context (struct fork_info *newfp, int from_tty)
|
{
|
{
|
/* Now we attempt to switch processes. */
|
/* Now we attempt to switch processes. */
|
struct fork_info *oldfp;
|
struct fork_info *oldfp;
|
ptid_t ptid;
|
ptid_t ptid;
|
int id, i;
|
int id, i;
|
|
|
gdb_assert (newfp != NULL);
|
gdb_assert (newfp != NULL);
|
|
|
oldfp = find_fork_ptid (inferior_ptid);
|
oldfp = find_fork_ptid (inferior_ptid);
|
gdb_assert (oldfp != NULL);
|
gdb_assert (oldfp != NULL);
|
|
|
fork_save_infrun_state (oldfp, 1);
|
fork_save_infrun_state (oldfp, 1);
|
remove_breakpoints ();
|
remove_breakpoints ();
|
fork_load_infrun_state (newfp);
|
fork_load_infrun_state (newfp);
|
insert_breakpoints ();
|
insert_breakpoints ();
|
|
|
printf_filtered (_("Switching to %s\n"),
|
printf_filtered (_("Switching to %s\n"),
|
target_pid_to_str (inferior_ptid));
|
target_pid_to_str (inferior_ptid));
|
|
|
print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
|
print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
|
}
|
}
|
|
|
/* Switch inferior process (checkpoint) context, by checkpoint id. */
|
/* Switch inferior process (checkpoint) context, by checkpoint id. */
|
static void
|
static void
|
restart_command (char *args, int from_tty)
|
restart_command (char *args, int from_tty)
|
{
|
{
|
struct fork_info *fp;
|
struct fork_info *fp;
|
|
|
if (!args || !*args)
|
if (!args || !*args)
|
error (_("Requires argument (checkpoint id to restart)"));
|
error (_("Requires argument (checkpoint id to restart)"));
|
|
|
if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL)
|
if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL)
|
error (_("Not found: checkpoint id %s"), args);
|
error (_("Not found: checkpoint id %s"), args);
|
|
|
linux_fork_context (fp, from_tty);
|
linux_fork_context (fp, from_tty);
|
}
|
}
|
|
|
void
|
void
|
_initialize_linux_fork (void)
|
_initialize_linux_fork (void)
|
{
|
{
|
init_fork_list ();
|
init_fork_list ();
|
|
|
/* Checkpoint command: create a fork of the inferior process
|
/* Checkpoint command: create a fork of the inferior process
|
and set it aside for later debugging. */
|
and set it aside for later debugging. */
|
|
|
add_com ("checkpoint", class_obscure, checkpoint_command, _("\
|
add_com ("checkpoint", class_obscure, checkpoint_command, _("\
|
Fork a duplicate process (experimental)."));
|
Fork a duplicate process (experimental)."));
|
|
|
/* Restart command: restore the context of a specified checkpoint
|
/* Restart command: restore the context of a specified checkpoint
|
process. */
|
process. */
|
|
|
add_com ("restart", class_obscure, restart_command, _("\
|
add_com ("restart", class_obscure, restart_command, _("\
|
restart <n>: restore program context from a checkpoint.\n\
|
restart <n>: restore program context from a checkpoint.\n\
|
Argument 'n' is checkpoint ID, as displayed by 'info checkpoints'."));
|
Argument 'n' is checkpoint ID, as displayed by 'info checkpoints'."));
|
|
|
/* Delete checkpoint command: kill the process and remove it from
|
/* Delete checkpoint command: kill the process and remove it from
|
the fork list. */
|
the fork list. */
|
|
|
add_cmd ("checkpoint", class_obscure, delete_checkpoint_command, _("\
|
add_cmd ("checkpoint", class_obscure, delete_checkpoint_command, _("\
|
Delete a checkpoint (experimental)."),
|
Delete a checkpoint (experimental)."),
|
&deletelist);
|
&deletelist);
|
|
|
/* Detach checkpoint command: release the process to run independently,
|
/* Detach checkpoint command: release the process to run independently,
|
and remove it from the fork list. */
|
and remove it from the fork list. */
|
|
|
add_cmd ("checkpoint", class_obscure, detach_checkpoint_command, _("\
|
add_cmd ("checkpoint", class_obscure, detach_checkpoint_command, _("\
|
Detach from a checkpoint (experimental)."),
|
Detach from a checkpoint (experimental)."),
|
&detachlist);
|
&detachlist);
|
|
|
/* Info checkpoints command: list all forks/checkpoints
|
/* Info checkpoints command: list all forks/checkpoints
|
currently under gdb's control. */
|
currently under gdb's control. */
|
|
|
add_info ("checkpoints", info_checkpoints_command,
|
add_info ("checkpoints", info_checkpoints_command,
|
_("IDs of currently known checkpoints."));
|
_("IDs of currently known checkpoints."));
|
}
|
}
|
|
|
