92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
/* Copyright (C) 1991, 92, 93, 95, 96 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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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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/* 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, -1 otherwise. */
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int
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ttyname_r (fd, buf, buflen)
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int fd;
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char *buf;
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int buflen;
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{
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static const char dev[] = "/dev";
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struct stat st;
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dev_t mydev;
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ino_t myino;
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DIR *dirstream;
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struct dirent *d;
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int save = errno;
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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 (buflen < (int) (sizeof (dev) + 1))
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{
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errno = EINVAL;
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return -1;
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}
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if (fstat (fd, &st) < 0)
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return -1;
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mydev = st.st_dev;
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myino = st.st_ino;
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dirstream = opendir (dev);
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if (dirstream == NULL)
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return -1;
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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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while ((d = readdir (dirstream)) != NULL)
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if (d->d_fileno == myino)
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{
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char *cp;
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cp = __stpncpy (&buf[sizeof (dev)], d->d_name,
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MIN ((int) (_D_EXACT_NAMLEN (d) + 1), buflen));
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cp[0] = '\0';
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if (stat (buf, &st) == 0 && st.st_dev == mydev)
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{
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(void) closedir (dirstream);
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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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errno = save;
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return -1;
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}
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