d3dd91fcbc
Changes to support building with _POSIX_SOURCE set to 199309L: 1. Add sys/_posix.h to handle those preprocessor defs that POSIX says have effects when defined before including any header files; 2. Change POSIX4_VISIBLE back to _POSIX4_VISIBLE 3. Add _POSIX4_VISIBLE_HISTORICALLY for pre-existing BSD features now defined in POSIX. These show up when: _POSIX_SOURCE and _POSIX_C_SOURCE are not set or _POSIX_C_SOURCE is set >= 199309L and vanish when: _POSIX_SOURCE is set or _POSIX_C_SOURCE is < 199309L. 4. Explain these in man 9 posix4; 5. Include _posix.h and conditionalize on new feature test.
296 lines
7.7 KiB
C
296 lines
7.7 KiB
C
/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Sean Eric Fagan of Cygnus Support.
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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[] = "@(#)sysconf.c 8.2 (Berkeley) 3/20/94";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/sysctl.h>
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#include <sys/resource.h>
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#include <errno.h>
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#include <time.h>
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#include <unistd.h>
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/*
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* sysconf --
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* get configurable system variables.
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*
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* XXX
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* POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
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* not change during the lifetime of the calling process. This would seem
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* to require that any change to system limits kill all running processes.
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* A workaround might be to cache the values when they are first retrieved
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* and then simply return the cached value on subsequent calls. This is
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* less useful than returning up-to-date values, however.
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*/
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long
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sysconf(name)
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int name;
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{
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struct rlimit rl;
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size_t len;
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int mib[2], value;
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len = sizeof(value);
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switch (name) {
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/* 1003.1 */
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case _SC_ARG_MAX:
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mib[0] = CTL_KERN;
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mib[1] = KERN_ARGMAX;
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break;
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case _SC_CHILD_MAX:
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return (getrlimit(RLIMIT_NPROC, &rl) ? -1 : rl.rlim_cur);
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case _SC_CLK_TCK:
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return (CLK_TCK);
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case _SC_JOB_CONTROL:
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mib[0] = CTL_KERN;
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mib[1] = KERN_JOB_CONTROL;
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goto yesno;
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case _SC_NGROUPS_MAX:
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mib[0] = CTL_KERN;
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mib[1] = KERN_NGROUPS;
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break;
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case _SC_OPEN_MAX:
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return (getrlimit(RLIMIT_NOFILE, &rl) ? -1 : rl.rlim_cur);
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case _SC_STREAM_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_STREAM_MAX;
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break;
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case _SC_TZNAME_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_TZNAME_MAX;
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break;
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case _SC_SAVED_IDS:
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mib[0] = CTL_KERN;
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mib[1] = KERN_SAVED_IDS;
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goto yesno;
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case _SC_VERSION:
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mib[0] = CTL_KERN;
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mib[1] = KERN_POSIX1;
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break;
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/* 1003.2 */
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case _SC_BC_BASE_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_BC_BASE_MAX;
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break;
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case _SC_BC_DIM_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_BC_DIM_MAX;
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break;
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case _SC_BC_SCALE_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_BC_SCALE_MAX;
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break;
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case _SC_BC_STRING_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_BC_STRING_MAX;
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break;
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case _SC_COLL_WEIGHTS_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_COLL_WEIGHTS_MAX;
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break;
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case _SC_EXPR_NEST_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_EXPR_NEST_MAX;
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break;
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case _SC_LINE_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_LINE_MAX;
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break;
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case _SC_RE_DUP_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_RE_DUP_MAX;
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break;
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case _SC_2_VERSION:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_VERSION;
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break;
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case _SC_2_C_BIND:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_C_BIND;
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goto yesno;
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case _SC_2_C_DEV:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_C_DEV;
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goto yesno;
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case _SC_2_CHAR_TERM:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_CHAR_TERM;
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goto yesno;
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case _SC_2_FORT_DEV:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_FORT_DEV;
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goto yesno;
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case _SC_2_FORT_RUN:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_FORT_RUN;
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goto yesno;
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case _SC_2_LOCALEDEF:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_LOCALEDEF;
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goto yesno;
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case _SC_2_SW_DEV:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_SW_DEV;
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goto yesno;
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case _SC_2_UPE:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_UPE;
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goto yesno;
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#if _POSIX_VERSION >= 199309L
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/* POSIX.4 */
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case _SC_ASYNCHRONOUS_IO:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_ASYNCHRONOUS_IO;
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goto yesno;
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case _SC_MAPPED_FILES:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_MAPPED_FILES;
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goto yesno;
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case _SC_MEMLOCK:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_MEMLOCK;
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goto yesno;
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case _SC_MEMLOCK_RANGE:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_MEMLOCK_RANGE;
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goto yesno;
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case _SC_MEMORY_PROTECTION:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_MEMORY_PROTECTION;
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goto yesno;
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case _SC_MESSAGE_PASSING:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_MESSAGE_PASSING;
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goto yesno;
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case _SC_PRIORITIZED_IO:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_PRIORITIZED_IO;
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goto yesno;
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case _SC_PRIORITY_SCHEDULING:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_PRIORITY_SCHEDULING;
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goto yesno;
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case _SC_REALTIME_SIGNALS:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_REALTIME_SIGNALS;
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goto yesno;
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case _SC_SEMAPHORES:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_SEMAPHORES;
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goto yesno;
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case _SC_FSYNC:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_FSYNC;
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goto yesno;
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case _SC_SHARED_MEMORY_OBJECTS:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_SHARED_MEMORY_OBJECTS;
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goto yesno;
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case _SC_SYNCHRONIZED_IO:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_SYNCHRONIZED_IO;
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goto yesno;
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case _SC_TIMERS:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_TIMERS;
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goto yesno;
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case _SC_AIO_LISTIO_MAX:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_AIO_LISTIO_MAX;
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goto yesno;
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case _SC_AIO_MAX:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_AIO_MAX;
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goto yesno;
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case _SC_AIO_PRIO_DELTA_MAX:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_AIO_PRIO_DELTA_MAX;
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goto yesno;
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case _SC_DELAYTIMER_MAX:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_DELAYTIMER_MAX;
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goto yesno;
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case _SC_MQ_OPEN_MAX:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_MQ_OPEN_MAX;
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goto yesno;
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case _SC_PAGESIZE:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_PAGESIZE;
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goto yesno;
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case _SC_RTSIG_MAX:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_RTSIG_MAX;
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goto yesno;
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case _SC_SEM_NSEMS_MAX:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_SEM_NSEMS_MAX;
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goto yesno;
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case _SC_SEM_VALUE_MAX:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_SEM_VALUE_MAX;
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goto yesno;
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case _SC_SIGQUEUE_MAX:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_SIGQUEUE_MAX;
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goto yesno;
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case _SC_TIMER_MAX:
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mib[0] = CTL_POSIX4;
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mib[1] = CTL_POSIX4_TIMER_MAX;
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goto yesno;
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#endif /* _POSIX_VERSION >= 199309L */
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yesno: if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
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return (-1);
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if (value == 0)
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return (-1);
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return (value);
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break;
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default:
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errno = EINVAL;
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return (-1);
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}
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return (sysctl(mib, 2, &value, &len, NULL, 0) == -1 ? -1 : value);
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}
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