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Commit	Line	Data
	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 <os/assumes.h>
	25	#include <os/once_private.h>
	26	#include <pthread.h>
	27	#include <stdlib.h>
	28	#include <string.h>
	29	#include <sys/ioctl.h>
	30	#include <sys/stat.h>
	31	#include <fcntl.h>
	32	#include <errno.h>
	33
	34	/*
	35	* posix_openpt call for cloning pty implementation.
	36	*
	37	* Just open /dev/ptmx
	38	*/
	39	int
	40	posix_openpt(int flags)
	41	{
	42	int fd = open("/dev/ptmx", flags);
	43	if (fd >= 0)
	44	return fd;
	45	return -1;
	46	}
	47
	48	/*
	49	* grantpt call for cloning pty implementation.
	50	*
	51	* Change UID and GID of slave pty associated with master pty whose
	52	* fd is provided, to the real UID and real GID of the calling thread.
	53	*/
	54	int
	55	grantpt(int fd)
	56	{
	57	return ioctl(fd, TIOCPTYGRANT);
	58	}
	59
	60	// defined by TIOCPTYGNAME
	61	#define PTSNAME_MAX_SIZE 128
	62
	63	static pthread_key_t ptsname_buffer_specific_key;
	64	static os_once_t ptsname_once;
	65
	66	static void
	67	ptsname_once_init(void *ctx __unused)
	68	{
	69	int ret = pthread_key_create(&ptsname_buffer_specific_key, free);
	70	os_assert_zero(ret);
	71	}
	72
	73	/*
	74	* ptsname call for cloning pty implementation.
	75	*
	76	* NOTE: Returns a pointer to a static buffer, which will be overwritten on
	77	* subsequent calls.
	78	*/
	79	char *
	80	ptsname(int fd)
	81	{
	82	os_once(&ptsname_once, NULL, ptsname_once_init);
	83	char *ptsnamebuf = pthread_getspecific(ptsname_buffer_specific_key);
	84
	85	if (ptsnamebuf == NULL) {
	86	ptsnamebuf = malloc(PTSNAME_MAX_SIZE);
	87	os_assert(ptsnamebuf);
	88
	89	int error = pthread_setspecific(ptsname_buffer_specific_key, ptsnamebuf);
	90	os_assert_zero(error);
	91	}
	92
	93	int error = ptsname_r(fd, ptsnamebuf, PTSNAME_MAX_SIZE);
	94
	95	return error ? NULL : ptsnamebuf;
	96	}
	97
	98	int
	99	ptsname_r(int fd, char *buffer, size_t buflen)
	100	{
	101	int error;
	102	struct stat sbuf;
	103	char ptsnamebuf[PTSNAME_MAX_SIZE];
	104
	105	if (!buffer) {
	106	errno = EINVAL;
	107	return -1;
	108	}
	109
	110	error = ioctl(fd, TIOCPTYGNAME, ptsnamebuf);
	111	if (error) {
	112	return -1;
	113	}
	114
	115	/*
	116	* XXX TSD
	117	*
	118	* POSIX: Handle device rename test case, which is expected
	119	* to fail if the pty has been renamed.
	120	*/
	121	error = stat(ptsnamebuf, &sbuf);
	122	if (error) {
	123	return -1;
	124	}
	125
	126	size_t len = strlen(ptsnamebuf) + 1;
	127	if (buflen < len) {
	128	errno = ERANGE;
	129	return -1;
	130	}
	131
	132	memcpy(buffer, ptsnamebuf, len);
	133
	134	return 0;
	135	}
	136
	137	/*
	138	* unlockpt call for cloning pty implementation.
	139	*
	140	* Unlock the slave pty associated with the master to which fd refers.
	141	*/
	142	int
	143	unlockpt(int fd)
	144	{
	145	return ioctl(fd, TIOCPTYUNLK);
	146	}