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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [ttyname_r.c] - Rev 207
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/* Copyright (C) 1991,92,93,1995-1999,2000,2001 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <errno.h> #include <limits.h> #include <stddef.h> #include <dirent.h> #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include <string.h> #include <stdio.h> #include <stdlib.h> #include <machine/weakalias.h> static int getttyname_r (char *buf, size_t buflen, dev_t mydev, ino64_t myino, int save, int *dostat); extern struct dirent64 *__readdir64 (DIR *); static int getttyname_r (char *buf, size_t buflen, dev_t mydev, ino64_t myino, int save, int *dostat) { struct stat64 st; DIR *dirstream; struct dirent64 *d; size_t devlen = strlen (buf); dirstream = opendir (buf); if (dirstream == NULL) { *dostat = -1; return errno; } while ((d = __readdir64 (dirstream)) != NULL) { if ((d->d_ino == myino || *dostat) && strcmp (d->d_name, "stdin") && strcmp (d->d_name, "stdout") && strcmp (d->d_name, "stderr")) { size_t needed = strlen (d->d_name) + 1; if (needed > buflen) { *dostat = -1; (void) closedir (dirstream); __set_errno (ERANGE); return ERANGE; } strncpy (buf + devlen, d->d_name, needed); if (stat64 (buf, &st) == 0 #ifdef _STATBUF_ST_RDEV && S_ISCHR (st.st_mode) && st.st_rdev == mydev #else && d->d_ino == myino && st.st_dev == mydev #endif ) { (void) closedir (dirstream); __set_errno (save); return 0; } } } (void) closedir (dirstream); __set_errno (save); /* It is not clear what to return in this case. `isatty' says FD refers to a TTY but no entry in /dev has this inode. */ return ENOTTY; } /* Store at most BUFLEN character of the pathname of the terminal FD is open on in BUF. Return 0 on success, otherwise an error number. */ int __ttyname_r (int fd, char *buf, size_t buflen) { char procname[30]; struct stat64 st, st1; int dostat = 0; int save = errno; int ret; /* Test for the absolute minimal size. This makes life easier inside the loop. */ if (!buf) { __set_errno (EINVAL); return EINVAL; } if (buflen < sizeof ("/dev/pts/")) { __set_errno (ERANGE); return ERANGE; } if (!isatty (fd)) { __set_errno (ENOTTY); return ENOTTY; } /* We try using the /proc filesystem. */ sprintf (procname, "/proc/self/fd/%d", fd); ret = readlink (procname, buf, buflen - 1); if (ret != -1 && buf[0] != '[') { buf[ret] = '\0'; return 0; } if (ret == -1 && errno == ENAMETOOLONG) { __set_errno (ERANGE); return ERANGE; } if (fstat64 (fd, &st) < 0) return errno; /* Prepare the result buffer. */ memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/")); buflen -= sizeof ("/dev/pts/") - 1; if (stat64 (buf, &st1) == 0 && S_ISDIR (st1.st_mode)) { #ifdef _STATBUF_ST_RDEV ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save, &dostat); #else ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save, &dostat); #endif } else { __set_errno (save); ret = ENOENT; } if (ret && dostat != -1) { buf[sizeof ("/dev/") - 1] = '\0'; buflen += sizeof ("pts/") - 1; #ifdef _STATBUF_ST_RDEV ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save, &dostat); #else ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save, &dostat); #endif } if (ret && dostat != -1) { buf[sizeof ("/dev/") - 1] = '\0'; dostat = 1; #ifdef _STATBUF_ST_RDEV ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save, &dostat); #else ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save, &dostat); #endif } return ret; } weak_alias (__ttyname_r, ttyname_r)