[apple/libc.git] / stdlib / grantpt.c

/*
 * Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */

#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>

/*
 * posix_openpt call for cloning pty implementation.
 *
 * Just open /dev/ptmx
 */
int
posix_openpt(int flags)
{
	int fd = open("/dev/ptmx", flags);
	if (fd >= 0)
		return fd;
	return -1;
}

/*
 * grantpt call for cloning pty implementation.
 *
 * Change UID and GID of slave pty associated with master pty whose
 * fd is provided, to the real UID and real GID of the calling thread.
 */
int
grantpt(int fd)
{
	return ioctl(fd, TIOCPTYGRANT);
}

/*
 * ptsname call for cloning pty implementation.
 *
 * NOTE: Returns a pointer to a static buffer, which will be overwritten on
 * subsequent calls.
 */
char *
ptsname(int fd)
{
	static char *ptsnamebuf = NULL;
	int error;
	char *retval = NULL;
	struct stat sbuf;

	if (ptsnamebuf == NULL) {
		ptsnamebuf = malloc(128); // defined by TIOCPTYGNAME
	}
	
	error = ioctl(fd, TIOCPTYGNAME, ptsnamebuf);
	if (!error) {
		/*
		 * XXX TSD
		 *
		 * POSIX: Handle device rename test case, which is expected
		 * to fail if the pty has been renamed.
		 */
		if (stat(ptsnamebuf, &sbuf) == 0) {
			retval = ptsnamebuf;
		}
	}

	return (retval);
}

/*
 * unlockpt call for cloning pty implementation.
 *
 * Unlock the slave pty associated with the master to which fd refers.
 */
int
unlockpt(int fd)
{
	return ioctl(fd, TIOCPTYUNLK);
}
Commit	Line	Data
224c7076 A	1	/*
	2	* Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
	12	*
	13	* The Original Code and all software distributed under the License are
	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23
	24	#include <stdlib.h>
	25	#include <sys/ioctl.h>
	26	#include <sys/stat.h>
	27	#include <fcntl.h>
	28	#include <errno.h>
	29
	30	/*
	31	* posix_openpt call for cloning pty implementation.
	32	*
	33	* Just open /dev/ptmx
	34	*/
	35	int
	36	posix_openpt(int flags)
	37	{
	38	int fd = open("/dev/ptmx", flags);
	39	if (fd >= 0)
	40	return fd;
	41	return -1;
	42	}
	43
	44	/*
	45	* grantpt call for cloning pty implementation.
	46	*
	47	* Change UID and GID of slave pty associated with master pty whose
	48	* fd is provided, to the real UID and real GID of the calling thread.
	49	*/
	50	int
	51	grantpt(int fd)
	52	{
	53	return ioctl(fd, TIOCPTYGRANT);
	54	}
	55
	56	/*
	57	* ptsname call for cloning pty implementation.
	58	*
	59	* NOTE: Returns a pointer to a static buffer, which will be overwritten on
	60	* subsequent calls.
	61	*/
	62	char *
	63	ptsname(int fd)
	64	{
6465356a	65	static char *ptsnamebuf = NULL;
224c7076 A	66	int error;
	67	char *retval = NULL;
	68	struct stat sbuf;
	69
6465356a A	70	if (ptsnamebuf == NULL) {
	71	ptsnamebuf = malloc(128); // defined by TIOCPTYGNAME
	72	}
	73
224c7076 A	74	error = ioctl(fd, TIOCPTYGNAME, ptsnamebuf);
	75	if (!error) {
	76	/*
	77	* XXX TSD
	78	*
	79	* POSIX: Handle device rename test case, which is expected
	80	* to fail if the pty has been renamed.
	81	*/
6465356a	82	if (stat(ptsnamebuf, &sbuf) == 0) {
224c7076	83	retval = ptsnamebuf;
6465356a	84	}
224c7076 A	85	}
	86
	87	return (retval);
	88	}
	89
	90	/*
	91	* unlockpt call for cloning pty implementation.
	92	*
	93	* Unlock the slave pty associated with the master to which fd refers.
	94	*/
	95	int
	96	unlockpt(int fd)
	97	{
	98	return ioctl(fd, TIOCPTYUNLK);
	99	}