[apple/libc.git] / gen / FreeBSD / ttyname.c

/*
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ttyname.c	8.2 (Berkeley) 1/27/94";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/gen/ttyname.c,v 1.16 2004/01/06 18:26:14 nectar Exp $");

#include "namespace.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
#include <string.h>
#include <paths.h>
#include <pthread.h>
#include "un-namespace.h"

#include "libc_private.h"

static char buf[sizeof(_PATH_DEV) + MAXNAMLEN];
static char *ttyname_threaded(int fd);
static char *ttyname_unthreaded(int fd);

static pthread_mutex_t	ttyname_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_key_t	ttyname_key;
static int		ttyname_init = 0;

char *
ttyname(int fd)
{
	char           *ret;

	if (__isthreaded == 0)
		ret = ttyname_unthreaded(fd);
	else
		ret = ttyname_threaded(fd);
	return (ret);
}

char *
ttyname_r(int fd, char *buf, size_t len)
{
	struct stat	sb;
	char		*rval;

	rval = NULL;

	/* Must be a terminal. */
	if (!isatty(fd))
		return (rval);
	/* Must be a character device. */
	if (_fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
		return (rval);
	/* Must have enough room */
	if (len <= sizeof(_PATH_DEV))
		return (rval);

	strcpy(buf, _PATH_DEV);
	devname_r(sb.st_rdev, S_IFCHR,
	    buf + strlen(buf), sizeof(buf) - strlen(buf));
	return (buf);
}

static char *
ttyname_threaded(int fd)
{
	char	*buf;

	if (ttyname_init == 0) {
		_pthread_mutex_lock(&ttyname_lock);
		if (ttyname_init == 0) {
			if (_pthread_key_create(&ttyname_key, free)) {
				_pthread_mutex_unlock(&ttyname_lock);
				return (NULL);
			}
			ttyname_init = 1;
		}
		_pthread_mutex_unlock(&ttyname_lock);
	}

	/* Must have thread specific data field to put data */
	if ((buf = _pthread_getspecific(ttyname_key)) == NULL) {
		if ((buf = malloc(sizeof(_PATH_DEV) + MAXNAMLEN)) != NULL) {
			if (_pthread_setspecific(ttyname_key, buf) != 0) {
				free(buf);
				return (NULL);
			}
		} else {
			return (NULL);
		}
	}
	return (ttyname_r(fd, buf, sizeof(_PATH_DEV) + MAXNAMLEN));
}

static char *
ttyname_unthreaded(int fd)
{
	struct stat	sb;
	struct termios	ttyb;

	/* Must be a terminal. */
	if (tcgetattr(fd, &ttyb) < 0)
		return (NULL);
	/* Must be a character device. */
	if (_fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
		return (NULL);

	strcpy(buf, _PATH_DEV);
	devname_r(sb.st_rdev, S_IFCHR,
	    buf + strlen(buf), sizeof(buf) - strlen(buf));
	return (buf);
}
Commit	Line	Data
e9ce8d39 A	1	/*
	2	* Copyright (c) 1988, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
9385eb3d A	34	#if defined(LIBC_SCCS) && !defined(lint)
	35	static char sccsid[] = "@(#)ttyname.c 8.2 (Berkeley) 1/27/94";
	36	#endif /* LIBC_SCCS and not lint */
	37	#include <sys/cdefs.h>
3d9156a7	38	__FBSDID("$FreeBSD: src/lib/libc/gen/ttyname.c,v 1.16 2004/01/06 18:26:14 nectar Exp $");
e9ce8d39	39
9385eb3d	40	#include "namespace.h"
e9ce8d39 A	41	#include <sys/types.h>
e9ce8d39 A	42	#include <sys/stat.h>
e9ce8d39 A	43	#include <fcntl.h>
e9ce8d39 A	44	#include <dirent.h>
9385eb3d A	45	#include <stdlib.h>
	46	#include <termios.h>
	47	#include <unistd.h>
e9ce8d39 A	48	#include <string.h>
e9ce8d39 A	49	#include <paths.h>
9385eb3d A	50	#include <pthread.h>
	51	#include "un-namespace.h"
	52
9385eb3d A	53	#include "libc_private.h"
9385eb3d A	54
3d9156a7	55	static char buf[sizeof(_PATH_DEV) + MAXNAMLEN];
9385eb3d A	56	static char *ttyname_threaded(int fd);
9385eb3d A	57	static char *ttyname_unthreaded(int fd);
e9ce8d39	58
9385eb3d A	59	static pthread_mutex_t ttyname_lock = PTHREAD_MUTEX_INITIALIZER;
	60	static pthread_key_t ttyname_key;
	61	static int ttyname_init = 0;
e9ce8d39 A	62
e9ce8d39 A	63	char *
9385eb3d A	64	ttyname(int fd)
	65	{
	66	char *ret;
	67
	68	if (__isthreaded == 0)
	69	ret = ttyname_unthreaded(fd);
	70	else
	71	ret = ttyname_threaded(fd);
	72	return (ret);
	73	}
	74
	75	char *
	76	ttyname_r(int fd, char *buf, size_t len)
	77	{
9385eb3d A	78	struct stat sb;
9385eb3d A	79	char *rval;
9385eb3d A	80
	81	rval = NULL;
	82
	83	/* Must be a terminal. */
	84	if (!isatty(fd))
	85	return (rval);
	86	/* Must be a character device. */
	87	if (_fstat(fd, &sb) \|\| !S_ISCHR(sb.st_mode))
	88	return (rval);
	89	/* Must have enough room */
	90	if (len <= sizeof(_PATH_DEV))
	91	return (rval);
	92
3d9156a7 A	93	strcpy(buf, _PATH_DEV);
	94	devname_r(sb.st_rdev, S_IFCHR,
	95	buf + strlen(buf), sizeof(buf) - strlen(buf));
	96	return (buf);
9385eb3d A	97	}
	98
	99	static char *
	100	ttyname_threaded(int fd)
	101	{
	102	char *buf;
	103
	104	if (ttyname_init == 0) {
	105	_pthread_mutex_lock(&ttyname_lock);
	106	if (ttyname_init == 0) {
	107	if (_pthread_key_create(&ttyname_key, free)) {
	108	_pthread_mutex_unlock(&ttyname_lock);
	109	return (NULL);
	110	}
	111	ttyname_init = 1;
	112	}
	113	_pthread_mutex_unlock(&ttyname_lock);
	114	}
	115
	116	/* Must have thread specific data field to put data */
	117	if ((buf = _pthread_getspecific(ttyname_key)) == NULL) {
	118	if ((buf = malloc(sizeof(_PATH_DEV) + MAXNAMLEN)) != NULL) {
	119	if (_pthread_setspecific(ttyname_key, buf) != 0) {
	120	free(buf);
	121	return (NULL);
	122	}
	123	} else {
	124	return (NULL);
	125	}
	126	}
	127	return (ttyname_r(fd, buf, sizeof(_PATH_DEV) + MAXNAMLEN));
	128	}
	129
	130	static char *
	131	ttyname_unthreaded(int fd)
e9ce8d39	132	{
9385eb3d A	133	struct stat sb;
9385eb3d A	134	struct termios ttyb;
e9ce8d39 A	135
e9ce8d39 A	136	/* Must be a terminal. */
9385eb3d	137	if (tcgetattr(fd, &ttyb) < 0)
e9ce8d39 A	138	return (NULL);
e9ce8d39 A	139	/* Must be a character device. */
9385eb3d	140	if (_fstat(fd, &sb) \|\| !S_ISCHR(sb.st_mode))
e9ce8d39 A	141	return (NULL);
e9ce8d39 A	142
3d9156a7 A	143	strcpy(buf, _PATH_DEV);
	144	devname_r(sb.st_rdev, S_IFCHR,
	145	buf + strlen(buf), sizeof(buf) - strlen(buf));
	146	return (buf);
e9ce8d39	147	}