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81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/* Copyright (C) 1998-2013 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 <paths.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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/* Static buffer for `ptsname'. */
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static char buffer[sizeof (_PATH_TTY) + 2];
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/* Return the pathname of the pseudo terminal slave assoicated with
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the master FD is open on, or NULL on errors.
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The returned storage is good until the next call to this function. */
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char *
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ptsname (int fd)
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{
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return __ptsname_r (fd, buffer, sizeof (buffer)) != 0 ? NULL : buffer;
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}
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/* Store at most BUFLEN characters of the pathname of the slave pseudo
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terminal associated with the master FD is open on in BUF.
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Return 0 on success, otherwise an error number. */
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int
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__ptsname_r (int fd, char *buf, size_t buflen)
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{
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int save_errno = errno;
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int err;
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struct stat st;
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if (buf == NULL)
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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 (!__isatty (fd))
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/* We rely on isatty to set errno properly (i.e. EBADF or ENOTTY). */
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return errno;
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if (buflen < strlen (_PATH_TTY) + 3)
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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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err = __ttyname_r (fd, buf, buflen);
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if (err != 0)
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{
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__set_errno (err);
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return errno;
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}
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buf[sizeof (_PATH_DEV) - 1] = 't';
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if (__stat (buf, &st) < 0)
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return errno;
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__set_errno (save_errno);
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return 0;
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}
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weak_alias (__ptsname_r, ptsname_r)
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