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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [gdb/] [ser-pipe.c] - Blame information for rev 227

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Line No. Rev Author Line
1 227 jeremybenn
/* Serial interface for a pipe to a separate program
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   Copyright (C) 1999, 2000, 2001, 2007, 2008, 2009, 2010
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   Free Software Foundation, Inc.
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   Contributed by Cygnus Solutions.
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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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   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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   (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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   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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   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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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#include "defs.h"
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#include "serial.h"
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#include "ser-base.h"
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#include "ser-unix.h"
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#include "gdb_vfork.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <fcntl.h>
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#include "gdb_string.h"
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#include <signal.h>
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static int pipe_open (struct serial *scb, const char *name);
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static void pipe_close (struct serial *scb);
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extern void _initialize_ser_pipe (void);
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struct pipe_state
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  {
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    int pid;
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  };
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/* Open up a raw pipe */
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static int
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pipe_open (struct serial *scb, const char *name)
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{
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#if !HAVE_SOCKETPAIR
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  return -1;
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#else
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  struct pipe_state *state;
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  /* This chunk: */
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  /* Copyright (c) 1988, 1993
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   *      The Regents of the University of California.  All rights reserved.
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   *
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   * This code is derived from software written by Ken Arnold and
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   * published in UNIX Review, Vol. 6, No. 8.
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   */
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  int pdes[2];
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  int err_pdes[2];
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  int pid;
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  if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
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    return -1;
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  if (socketpair (AF_UNIX, SOCK_STREAM, 0, err_pdes) < 0)
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    return -1;
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  /* Create the child process to run the command in.  Note that the
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     apparent call to vfork() below *might* actually be a call to
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     fork() due to the fact that autoconf will ``#define vfork fork''
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     on certain platforms.  */
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  pid = vfork ();
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  /* Error. */
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  if (pid == -1)
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    {
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      close (pdes[0]);
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      close (pdes[1]);
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      close (err_pdes[0]);
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      close (err_pdes[1]);
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      return -1;
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    }
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  if (fcntl (err_pdes[0], F_SETFL, O_NONBLOCK) == -1)
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    {
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      close (err_pdes[0]);
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      close (err_pdes[1]);
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      err_pdes[0] = err_pdes[1] = -1;
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    }
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  /* Child. */
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  if (pid == 0)
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    {
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      /* re-wire pdes[1] to stdin/stdout */
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      close (pdes[0]);
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      if (pdes[1] != STDOUT_FILENO)
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        {
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          dup2 (pdes[1], STDOUT_FILENO);
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          close (pdes[1]);
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        }
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      dup2 (STDOUT_FILENO, STDIN_FILENO);
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      if (err_pdes[0] != -1)
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        {
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          close (err_pdes[0]);
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          dup2 (err_pdes[1], STDERR_FILENO);
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          close (err_pdes[1]);
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        }
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#if 0
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      /* close any stray FD's - FIXME - how? */
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      /* POSIX.2 B.3.2.2 "popen() shall ensure that any streams
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         from previous popen() calls that remain open in the
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         parent process are closed in the new child process. */
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      for (old = pidlist; old; old = old->next)
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        close (fileno (old->fp));       /* don't allow a flush */
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#endif
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      execl ("/bin/sh", "sh", "-c", name, (char *) 0);
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      _exit (127);
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    }
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  /* Parent. */
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  close (pdes[1]);
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  /* :end chunk */
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  state = XMALLOC (struct pipe_state);
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  state->pid = pid;
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  scb->fd = pdes[0];
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  scb->error_fd = err_pdes[0];
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  scb->state = state;
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  /* If we don't do this, GDB simply exits when the remote side dies.  */
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  signal (SIGPIPE, SIG_IGN);
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  return 0;
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#endif
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}
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static void
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pipe_close (struct serial *scb)
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{
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  struct pipe_state *state = scb->state;
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  if (state != NULL)
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    {
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      int pid = state->pid;
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      close (scb->fd);
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      scb->fd = -1;
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      xfree (state);
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      scb->state = NULL;
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      kill (pid, SIGTERM);
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      /* Might be useful to check that the child does die. */
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    }
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}
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static struct serial_ops pipe_ops;
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void
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_initialize_ser_pipe (void)
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{
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  struct serial_ops *ops = XMALLOC (struct serial_ops);
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  memset (ops, 0, sizeof (struct serial_ops));
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  ops->name = "pipe";
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  ops->next = 0;
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  ops->open = pipe_open;
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  ops->close = pipe_close;
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  ops->readchar = ser_base_readchar;
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  ops->write = ser_base_write;
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  ops->flush_output = ser_base_flush_output;
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  ops->flush_input = ser_base_flush_input;
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  ops->send_break = ser_base_send_break;
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  ops->go_raw = ser_base_raw;
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  ops->get_tty_state = ser_base_get_tty_state;
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  ops->set_tty_state = ser_base_set_tty_state;
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  ops->print_tty_state = ser_base_print_tty_state;
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  ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;
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  ops->setbaudrate = ser_base_setbaudrate;
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  ops->setstopbits = ser_base_setstopbits;
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  ops->drain_output = ser_base_drain_output;
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  ops->async = ser_base_async;
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  ops->read_prim = ser_unix_read_prim;
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  ops->write_prim = ser_unix_write_prim;
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  serial_add_interface (ops);
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}

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