[apple/libc.git] / gen / sysconf.c

/*
 * Copyright (c) 1999 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@
 */
/*
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Sean Eric Fagan of Cygnus Support.
 *
 * 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.
 */


#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/resource.h>

#include <errno.h>
#include <unistd.h>

/*
 * sysconf --
 *	get configurable system variables.
 *
 * XXX
 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
 * not change during the lifetime of the calling process.  This would seem
 * to require that any change to system limits kill all running processes.
 * A workaround might be to cache the values when they are first retrieved
 * and then simply return the cached value on subsequent calls.  This is
 * less useful than returning up-to-date values, however.
 */
long
sysconf(name)
	int name;
{
	struct rlimit rl;
	size_t len;
	int mib[2], value;

	len = sizeof(value);

	switch (name) {
/* 1003.1 */
	case _SC_ARG_MAX:
		mib[0] = CTL_KERN;
		mib[1] = KERN_ARGMAX;
		break;
	case _SC_CHILD_MAX:
		return (getrlimit(RLIMIT_NPROC, &rl) ? -1 : rl.rlim_cur);
	case _SC_CLK_TCK:
		return (CLK_TCK);
	case _SC_JOB_CONTROL:
		mib[0] = CTL_KERN;
		mib[1] = KERN_JOB_CONTROL;
		goto yesno;
	case _SC_NGROUPS_MAX:
		mib[0] = CTL_KERN;
		mib[1] = KERN_NGROUPS;
		break;
	case _SC_OPEN_MAX:
		return (getrlimit(RLIMIT_NOFILE, &rl) ? -1 : rl.rlim_cur);
	case _SC_STREAM_MAX:
		mib[0] = CTL_USER;
		mib[1] = USER_STREAM_MAX;
		break;
	case _SC_TZNAME_MAX:
		mib[0] = CTL_USER;
		mib[1] = USER_TZNAME_MAX;
		break;
	case _SC_SAVED_IDS:
		mib[0] = CTL_KERN;
		mib[1] = KERN_SAVED_IDS;
		goto yesno;
	case _SC_VERSION:
		mib[0] = CTL_KERN;
		mib[1] = KERN_POSIX1;
		break;

/* 1003.2 */
	case _SC_BC_BASE_MAX:
		mib[0] = CTL_USER;
		mib[1] = USER_BC_BASE_MAX;
		break;
	case _SC_BC_DIM_MAX:
		mib[0] = CTL_USER;
		mib[1] = USER_BC_DIM_MAX;
		break;
	case _SC_BC_SCALE_MAX:
		mib[0] = CTL_USER;
		mib[1] = USER_BC_SCALE_MAX;
		break;
	case _SC_BC_STRING_MAX:
		mib[0] = CTL_USER;
		mib[1] = USER_BC_STRING_MAX;
		break;
	case _SC_COLL_WEIGHTS_MAX:
		mib[0] = CTL_USER;
		mib[1] = USER_COLL_WEIGHTS_MAX;
		break;
	case _SC_EXPR_NEST_MAX:
		mib[0] = CTL_USER;
		mib[1] = USER_EXPR_NEST_MAX;
		break;
	case _SC_LINE_MAX:
		mib[0] = CTL_USER;
		mib[1] = USER_LINE_MAX;
		break;
	case _SC_PAGESIZE:
		mib[0] = CTL_HW;
		mib[1] = HW_PAGESIZE;
		break;
	case _SC_RE_DUP_MAX:
		mib[0] = CTL_USER;
		mib[1] = USER_RE_DUP_MAX;
		break;
	case _SC_2_VERSION:
		mib[0] = CTL_USER;
		mib[1] = USER_POSIX2_VERSION;
		break;
	case _SC_2_C_BIND:
		mib[0] = CTL_USER;
		mib[1] = USER_POSIX2_C_BIND;
		goto yesno;
	case _SC_2_C_DEV:
		mib[0] = CTL_USER;
		mib[1] = USER_POSIX2_C_DEV;
		goto yesno;
	case _SC_2_CHAR_TERM:
		mib[0] = CTL_USER;
		mib[1] = USER_POSIX2_CHAR_TERM;
		goto yesno;
	case _SC_2_FORT_DEV:
		mib[0] = CTL_USER;
		mib[1] = USER_POSIX2_FORT_DEV;
		goto yesno;
	case _SC_2_FORT_RUN:
		mib[0] = CTL_USER;
		mib[1] = USER_POSIX2_FORT_RUN;
		goto yesno;
	case _SC_2_LOCALEDEF:
		mib[0] = CTL_USER;
		mib[1] = USER_POSIX2_LOCALEDEF;
		goto yesno;
	case _SC_2_SW_DEV:
		mib[0] = CTL_USER;
		mib[1] = USER_POSIX2_SW_DEV;
		goto yesno;
	case _SC_2_UPE:
		mib[0] = CTL_USER;
		mib[1] = USER_POSIX2_UPE;
yesno:		if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
			return (-1);
		if (value == 0)
			return (-1);
		return (value);
		break;
	default:
		errno = EINVAL;
		return (-1);
	}
	return (sysctl(mib, 2, &value, &len, NULL, 0) == -1 ? -1 : value); 
}
Commit	Line	Data
e9ce8d39 A	1	/*
	2	* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
734aad71 A	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
e9ce8d39 A	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
e9ce8d39 A	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
734aad71 A	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.
e9ce8d39 A	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23	/*
	24	* Copyright (c) 1993
	25	* The Regents of the University of California. All rights reserved.
	26	*
	27	* This code is derived from software contributed to Berkeley by
	28	* Sean Eric Fagan of Cygnus Support.
	29	*
	30	* Redistribution and use in source and binary forms, with or without
	31	* modification, are permitted provided that the following conditions
	32	* are met:
	33	* 1. Redistributions of source code must retain the above copyright
	34	* notice, this list of conditions and the following disclaimer.
	35	* 2. Redistributions in binary form must reproduce the above copyright
	36	* notice, this list of conditions and the following disclaimer in the
	37	* documentation and/or other materials provided with the distribution.
	38	* 3. All advertising materials mentioning features or use of this software
	39	* must display the following acknowledgement:
	40	* This product includes software developed by the University of
	41	* California, Berkeley and its contributors.
	42	* 4. Neither the name of the University nor the names of its contributors
	43	* may be used to endorse or promote products derived from this software
	44	* without specific prior written permission.
	45	*
	46	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	47	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	48	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	49	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	50	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	51	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	52	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	53	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	54	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	55	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	56	* SUCH DAMAGE.
	57	*/
	58
	59
	60	#include <sys/param.h>
	61	#include <sys/sysctl.h>
	62	#include <sys/time.h>
	63	#include <sys/resource.h>
	64
	65	#include <errno.h>
	66	#include <unistd.h>
	67
	68	/*
	69	* sysconf --
	70	* get configurable system variables.
	71	*
	72	* XXX
	73	* POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
	74	* not change during the lifetime of the calling process. This would seem
	75	* to require that any change to system limits kill all running processes.
	76	* A workaround might be to cache the values when they are first retrieved
	77	* and then simply return the cached value on subsequent calls. This is
	78	* less useful than returning up-to-date values, however.
	79	*/
	80	long
	81	sysconf(name)
	82	int name;
	83	{
e9ce8d39 A	84	struct rlimit rl;
	85	size_t len;
	86	int mib[2], value;
	87
	88	len = sizeof(value);
	89
	90	switch (name) {
	91	/* 1003.1 */
	92	case _SC_ARG_MAX:
	93	mib[0] = CTL_KERN;
	94	mib[1] = KERN_ARGMAX;
	95	break;
	96	case _SC_CHILD_MAX:
	97	return (getrlimit(RLIMIT_NPROC, &rl) ? -1 : rl.rlim_cur);
	98	case _SC_CLK_TCK:
	99	return (CLK_TCK);
	100	case _SC_JOB_CONTROL:
	101	mib[0] = CTL_KERN;
	102	mib[1] = KERN_JOB_CONTROL;
	103	goto yesno;
	104	case _SC_NGROUPS_MAX:
	105	mib[0] = CTL_KERN;
	106	mib[1] = KERN_NGROUPS;
	107	break;
	108	case _SC_OPEN_MAX:
	109	return (getrlimit(RLIMIT_NOFILE, &rl) ? -1 : rl.rlim_cur);
	110	case _SC_STREAM_MAX:
	111	mib[0] = CTL_USER;
	112	mib[1] = USER_STREAM_MAX;
	113	break;
	114	case _SC_TZNAME_MAX:
	115	mib[0] = CTL_USER;
	116	mib[1] = USER_TZNAME_MAX;
	117	break;
	118	case _SC_SAVED_IDS:
	119	mib[0] = CTL_KERN;
	120	mib[1] = KERN_SAVED_IDS;
	121	goto yesno;
	122	case _SC_VERSION:
	123	mib[0] = CTL_KERN;
	124	mib[1] = KERN_POSIX1;
	125	break;
	126
	127	/* 1003.2 */
	128	case _SC_BC_BASE_MAX:
	129	mib[0] = CTL_USER;
	130	mib[1] = USER_BC_BASE_MAX;
	131	break;
	132	case _SC_BC_DIM_MAX:
	133	mib[0] = CTL_USER;
	134	mib[1] = USER_BC_DIM_MAX;
	135	break;
	136	case _SC_BC_SCALE_MAX:
	137	mib[0] = CTL_USER;
	138	mib[1] = USER_BC_SCALE_MAX;
	139	break;
	140	case _SC_BC_STRING_MAX:
	141	mib[0] = CTL_USER;
	142	mib[1] = USER_BC_STRING_MAX;
	143	break;
	144	case _SC_COLL_WEIGHTS_MAX:
	145	mib[0] = CTL_USER;
	146	mib[1] = USER_COLL_WEIGHTS_MAX;
	147	break;
148	case _SC_EXPR_NEST_MAX:
149	mib[0] = CTL_USER;
150	mib[1] = USER_EXPR_NEST_MAX;
151	break;
152	case _SC_LINE_MAX:
153	mib[0] = CTL_USER;
154	mib[1] = USER_LINE_MAX;
155	break;
9385eb3d A	156	case _SC_PAGESIZE:
	157	mib[0] = CTL_HW;
	158	mib[1] = HW_PAGESIZE;
	159	break;
e9ce8d39 A	160	case _SC_RE_DUP_MAX:
	161	mib[0] = CTL_USER;
	162	mib[1] = USER_RE_DUP_MAX;
	163	break;
	164	case _SC_2_VERSION:
	165	mib[0] = CTL_USER;
	166	mib[1] = USER_POSIX2_VERSION;
	167	break;
	168	case _SC_2_C_BIND:
	169	mib[0] = CTL_USER;
	170	mib[1] = USER_POSIX2_C_BIND;
	171	goto yesno;
	172	case _SC_2_C_DEV:
	173	mib[0] = CTL_USER;
	174	mib[1] = USER_POSIX2_C_DEV;
	175	goto yesno;
	176	case _SC_2_CHAR_TERM:
	177	mib[0] = CTL_USER;
	178	mib[1] = USER_POSIX2_CHAR_TERM;
	179	goto yesno;
	180	case _SC_2_FORT_DEV:
	181	mib[0] = CTL_USER;
	182	mib[1] = USER_POSIX2_FORT_DEV;
	183	goto yesno;
	184	case _SC_2_FORT_RUN:
	185	mib[0] = CTL_USER;
	186	mib[1] = USER_POSIX2_FORT_RUN;
	187	goto yesno;
	188	case _SC_2_LOCALEDEF:
	189	mib[0] = CTL_USER;
	190	mib[1] = USER_POSIX2_LOCALEDEF;
	191	goto yesno;
	192	case _SC_2_SW_DEV:
	193	mib[0] = CTL_USER;
	194	mib[1] = USER_POSIX2_SW_DEV;
	195	goto yesno;
	196	case _SC_2_UPE:
	197	mib[0] = CTL_USER;
	198	mib[1] = USER_POSIX2_UPE;
	199	yesno: if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
	200	return (-1);
	201	if (value == 0)
	202	return (-1);
	203	return (value);
	204	break;
	205	default:
	206	errno = EINVAL;
	207	return (-1);
	208	}
	209	return (sysctl(mib, 2, &value, &len, NULL, 0) == -1 ? -1 : value);
	210	}