157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
/* Copyright (C) 1991-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <limits.h>
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#include <stddef.h>
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#include <dirent.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#ifndef MIN
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# define MIN(a, b) ((a) < (b) ? (a) : (b))
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#endif
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static const char dev[] = "/dev";
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static int getttyname_r (int fd, char *buf, size_t buflen,
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dev_t mydev, ino_t myino, int save,
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int *dostat) __THROW internal_function;
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static int
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internal_function
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getttyname_r (int fd, char *buf, size_t buflen, dev_t mydev, ino_t myino,
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int save, int *dostat)
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{
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struct stat st;
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DIR *dirstream;
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struct dirent *d;
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dirstream = __opendir (dev);
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if (dirstream == NULL)
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{
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*dostat = -1;
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return errno;
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}
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while ((d = __readdir (dirstream)) != NULL)
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if (((ino_t) d->d_fileno == myino || *dostat)
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&& strcmp (d->d_name, "stdin")
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&& strcmp (d->d_name, "stdout")
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&& strcmp (d->d_name, "stderr"))
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{
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char *cp;
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size_t needed = _D_EXACT_NAMLEN (d) + 1;
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if (needed > buflen)
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{
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*dostat = -1;
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(void) __closedir (dirstream);
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__set_errno (ERANGE);
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return ERANGE;
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}
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cp = __stpncpy (&buf[sizeof (dev)], d->d_name, needed);
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cp[0] = '\0';
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if (stat (buf, &st) == 0
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#ifdef _STATBUF_ST_RDEV
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&& S_ISCHR (st.st_mode) && st.st_rdev == mydev
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#else
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&& (ino_t) d->d_fileno == myino && st.st_dev == mydev
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#endif
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)
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{
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(void) __closedir (dirstream);
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__set_errno (save);
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return 0;
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}
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}
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(void) __closedir (dirstream);
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__set_errno (save);
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/* It is not clear what to return in this case. `isatty' says FD
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refers to a TTY but no entry in /dev has this inode. */
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return ENOTTY;
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}
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/* Store at most BUFLEN character of the pathname of the terminal FD is
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open on in BUF. Return 0 on success, otherwise an error number. */
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int
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__ttyname_r (int fd, char *buf, size_t buflen)
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{
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struct stat st;
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int dostat = 0;
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int save = errno;
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int ret;
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/* Test for the absolute minimal size. This makes life easier inside
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the loop. */
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if (!buf)
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{
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__set_errno (EINVAL);
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return EINVAL;
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}
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if (buflen < (int) (sizeof (dev) + 1))
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{
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__set_errno (ERANGE);
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return ERANGE;
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}
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if (!__isatty (fd))
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{
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__set_errno (ENOTTY);
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return ENOTTY;
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}
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if (fstat (fd, &st) < 0)
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return errno;
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/* Prepare the result buffer. */
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memcpy (buf, dev, sizeof (dev) - 1);
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buf[sizeof (dev) - 1] = '/';
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buflen -= sizeof (dev);
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#ifdef _STATBUF_ST_RDEV
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ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino, save,
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&dostat);
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#else
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ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino, save,
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&dostat);
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#endif
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if (ret && dostat != -1)
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{
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dostat = 1;
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#ifdef _STATBUF_ST_RDEV
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ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino,
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save, &dostat);
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#else
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ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino,
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save, &dostat);
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#endif
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}
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return ret;
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}
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weak_alias (__ttyname_r, ttyname_r)
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