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131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/* Copyright (C) 1991-2024 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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<https://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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#include <set-freeres.h>
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char *__ttyname;
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static char *getttyname (int fd, dev_t mydev, ino_t myino,
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int save, int *dostat);
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static char *getttyname_name;
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weak_alias (getttyname_name, __ttyname_freemem_ptr)
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static char *
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getttyname (int fd, dev_t mydev, ino_t myino, int save, int *dostat)
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{
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static const char dev[] = "/dev";
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static size_t namelen;
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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 NULL;
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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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size_t dlen = _D_ALLOC_NAMLEN (d);
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if (sizeof (dev) + dlen > namelen)
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{
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free (getttyname_name);
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namelen = 2 * (sizeof (dev) + dlen); /* Big enough. */
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getttyname_name = malloc (namelen);
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if (! getttyname_name)
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{
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*dostat = -1;
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/* Perhaps it helps to free the directory stream buffer. */
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(void) __closedir (dirstream);
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return NULL;
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}
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*((char *) __mempcpy (getttyname_name, dev, sizeof (dev) - 1))
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= '/';
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}
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(void) __mempcpy (&getttyname_name[sizeof (dev)], d->d_name, dlen);
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if (stat (getttyname_name, &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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__ttyname = getttyname_name;
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__set_errno (save);
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return getttyname_name;
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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 NULL;
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}
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/* Return the pathname of the terminal FD is open on, or NULL on errors.
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The returned storage is good only until the next call to this function. */
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char *
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ttyname (int fd)
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{
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struct stat st;
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int dostat = 0;
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char *name;
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int save = errno;
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if (!__isatty (fd))
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return NULL;
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if (fstat (fd, &st) < 0)
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return NULL;
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#ifdef _STATBUF_ST_RDEV
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name = getttyname (fd, st.st_rdev, st.st_ino, save, &dostat);
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#else
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name = getttyname (fd, st.st_dev, st.st_ino, save, &dostat);
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#endif
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if (!name && dostat != -1)
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{
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dostat = 1;
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#ifdef _STATBUF_ST_RDEV
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name = getttyname (fd, st.st_rdev, st.st_ino, save, &dostat);
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#else
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name = getttyname (fd, st.st_dev, st.st_ino, save, &dostat);
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#endif
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}
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return name;
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}
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