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148 lines
4.2 KiB
C
148 lines
4.2 KiB
C
/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)ttyname.c 8.2 (Berkeley) 1/27/94";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include <termios.h>
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#include <unistd.h>
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#include <string.h>
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#include <paths.h>
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#include <pthread.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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static char buf[sizeof(_PATH_DEV) + MAXNAMLEN];
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static char *ttyname_threaded(int fd);
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static char *ttyname_unthreaded(int fd);
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static pthread_mutex_t ttyname_lock = PTHREAD_MUTEX_INITIALIZER;
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static pthread_key_t ttyname_key;
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static int ttyname_init = 0;
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char *
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ttyname(int fd)
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{
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char *ret;
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if (__isthreaded == 0)
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ret = ttyname_unthreaded(fd);
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else
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ret = ttyname_threaded(fd);
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return (ret);
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}
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char *
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ttyname_r(int fd, char *buf, size_t len)
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{
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struct stat sb;
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char *rval;
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rval = NULL;
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/* Must be a terminal. */
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if (!isatty(fd))
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return (rval);
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/* Must be a character device. */
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if (_fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
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return (rval);
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/* Must have enough room */
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if (len <= sizeof(_PATH_DEV))
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return (rval);
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strcpy(buf, _PATH_DEV);
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devname_r(sb.st_rdev, S_IFCHR,
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buf + strlen(buf), sizeof(buf) - strlen(buf));
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return (buf);
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}
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static char *
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ttyname_threaded(int fd)
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{
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char *buf;
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if (ttyname_init == 0) {
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_pthread_mutex_lock(&ttyname_lock);
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if (ttyname_init == 0) {
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if (_pthread_key_create(&ttyname_key, free)) {
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_pthread_mutex_unlock(&ttyname_lock);
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return (NULL);
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}
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ttyname_init = 1;
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}
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_pthread_mutex_unlock(&ttyname_lock);
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}
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/* Must have thread specific data field to put data */
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if ((buf = _pthread_getspecific(ttyname_key)) == NULL) {
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if ((buf = malloc(sizeof(_PATH_DEV) + MAXNAMLEN)) != NULL) {
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if (_pthread_setspecific(ttyname_key, buf) != 0) {
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free(buf);
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return (NULL);
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}
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} else {
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return (NULL);
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}
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}
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return (ttyname_r(fd, buf, sizeof(_PATH_DEV) + MAXNAMLEN));
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}
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static char *
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ttyname_unthreaded(int fd)
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{
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struct stat sb;
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struct termios ttyb;
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/* Must be a terminal. */
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if (tcgetattr(fd, &ttyb) < 0)
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return (NULL);
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/* Must be a character device. */
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if (_fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
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return (NULL);
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strcpy(buf, _PATH_DEV);
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devname_r(sb.st_rdev, S_IFCHR,
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buf + strlen(buf), sizeof(buf) - strlen(buf));
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return (buf);
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}
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