6ca61b39bb
{SHRT_MAX}, so {STREAM_MAX} should be no greater than that. (This
does not exactly meet the letter of POSIX but comes reasonably close
to it in spirit.)
MFC after: 14 days
609 lines
15 KiB
C
609 lines
15 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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* 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/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 <sys/socket.h>
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#include <errno.h>
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#include <limits.h>
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#include <paths.h>
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#include <pthread.h> /* we just need the limits */
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#include <time.h>
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#include <unistd.h>
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#include "../stdlib/atexit.h"
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#include "../stdtime/tzfile.h"
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#define _PATH_ZONEINFO TZDIR /* from tzfile.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], sverrno, value;
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long lvalue, defaultresult;
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const char *path;
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defaultresult = -1;
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switch (name) {
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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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if (getrlimit(RLIMIT_NPROC, &rl) != 0)
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return (-1);
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if (rl.rlim_cur == RLIM_INFINITY)
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return (-1);
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if (rl.rlim_cur > LONG_MAX) {
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errno = EOVERFLOW;
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return (-1);
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}
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return ((long)rl.rlim_cur);
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case _SC_CLK_TCK:
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return (CLK_TCK);
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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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if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
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return (-1);
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if (rl.rlim_cur == RLIM_INFINITY)
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return (-1);
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if (rl.rlim_cur > LONG_MAX) {
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errno = EOVERFLOW;
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return (-1);
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}
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return ((long)rl.rlim_cur);
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case _SC_STREAM_MAX:
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if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
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return (-1);
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if (rl.rlim_cur == RLIM_INFINITY)
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return (-1);
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if (rl.rlim_cur > LONG_MAX) {
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errno = EOVERFLOW;
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return (-1);
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}
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/*
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* struct __sFILE currently has a limitation that
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* file descriptors must fit in a signed short.
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* This doesn't precisely capture the letter of POSIX
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* but approximates the spirit.
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*/
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if (rl.rlim_cur > SHRT_MAX)
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return (SHRT_MAX);
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return ((long)rl.rlim_cur);
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case _SC_JOB_CONTROL:
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return (_POSIX_JOB_CONTROL);
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case _SC_SAVED_IDS:
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/* XXX - must be 1 */
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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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case _SC_BC_BASE_MAX:
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return (BC_BASE_MAX);
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case _SC_BC_DIM_MAX:
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return (BC_DIM_MAX);
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case _SC_BC_SCALE_MAX:
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return (BC_SCALE_MAX);
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case _SC_BC_STRING_MAX:
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return (BC_STRING_MAX);
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case _SC_COLL_WEIGHTS_MAX:
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return (COLL_WEIGHTS_MAX);
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case _SC_EXPR_NEST_MAX:
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return (EXPR_NEST_MAX);
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case _SC_LINE_MAX:
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return (LINE_MAX);
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case _SC_RE_DUP_MAX:
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return (RE_DUP_MAX);
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case _SC_2_VERSION:
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/*
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* This is something of a lie, but it would be silly at
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* this point to try to deduce this from the contents
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* of the filesystem.
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*/
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return (_POSIX2_VERSION);
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case _SC_2_C_BIND:
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return (_POSIX2_C_BIND);
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case _SC_2_C_DEV:
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return (_POSIX2_C_DEV);
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case _SC_2_CHAR_TERM:
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return (_POSIX2_CHAR_TERM);
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case _SC_2_FORT_DEV:
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return (_POSIX2_FORT_DEV);
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case _SC_2_FORT_RUN:
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return (_POSIX2_FORT_RUN);
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case _SC_2_LOCALEDEF:
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return (_POSIX2_LOCALEDEF);
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case _SC_2_SW_DEV:
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return (_POSIX2_SW_DEV);
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case _SC_2_UPE:
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return (_POSIX2_UPE);
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case _SC_TZNAME_MAX:
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path = _PATH_ZONEINFO;
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do_NAME_MAX:
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sverrno = errno;
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errno = 0;
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lvalue = pathconf(path, _PC_NAME_MAX);
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if (lvalue == -1 && errno != 0)
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return (-1);
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errno = sverrno;
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return (lvalue);
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case _SC_ASYNCHRONOUS_IO:
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#if _POSIX_ASYNCHRONOUS_IO == 0
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO;
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break;
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#else
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return (_POSIX_ASYNCHRONOUS_IO);
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#endif
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case _SC_MAPPED_FILES:
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return (_POSIX_MAPPED_FILES);
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case _SC_MEMLOCK:
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return (_POSIX_MEMLOCK);
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case _SC_MEMLOCK_RANGE:
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return (_POSIX_MEMLOCK_RANGE);
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case _SC_MEMORY_PROTECTION:
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return (_POSIX_MEMORY_PROTECTION);
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case _SC_MESSAGE_PASSING:
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#if _POSIX_MESSAGE_PASSING == 0
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_MESSAGE_PASSING;
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goto yesno;
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#else
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return (_POSIX_MESSAGE_PASSING);
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#endif
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case _SC_PRIORITIZED_IO:
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#if _POSIX_PRIORITIZED_IO == 0
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_PRIORITIZED_IO;
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goto yesno;
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#else
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return (_POSIX_PRIORITIZED_IO);
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#endif
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case _SC_PRIORITY_SCHEDULING:
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#if _POSIX_PRIORITY_SCHEDULING == 0
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
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goto yesno;
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#else
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return (_POSIX_PRIORITY_SCHEDULING);
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#endif
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case _SC_REALTIME_SIGNALS:
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#if _POSIX_REALTIME_SIGNALS == 0
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_REALTIME_SIGNALS;
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goto yesno;
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#else
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return (_POSIX_REALTIME_SIGNALS);
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#endif
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case _SC_SEMAPHORES:
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#if _POSIX_SEMAPHORES == 0
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_SEMAPHORES;
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goto yesno;
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#else
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return (_POSIX_SEMAPHORES);
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#endif
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case _SC_FSYNC:
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return (_POSIX_FSYNC);
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case _SC_SHARED_MEMORY_OBJECTS:
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return (_POSIX_SHARED_MEMORY_OBJECTS);
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case _SC_SYNCHRONIZED_IO:
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#if _POSIX_SYNCHRONIZED_IO == 0
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO;
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goto yesno;
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#else
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return (_POSIX_SYNCHRONIZED_IO);
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#endif
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case _SC_TIMERS:
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#if _POSIX_TIMERS == 0
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_TIMERS;
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goto yesno;
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#else
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return (_POSIX_TIMERS);
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#endif
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case _SC_AIO_LISTIO_MAX:
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
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break;
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case _SC_AIO_MAX:
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_AIO_MAX;
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break;
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case _SC_AIO_PRIO_DELTA_MAX:
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
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break;
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case _SC_DELAYTIMER_MAX:
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
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goto yesno;
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case _SC_MQ_OPEN_MAX:
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_MQ_OPEN_MAX;
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goto yesno;
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case _SC_PAGESIZE:
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defaultresult = getpagesize();
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_PAGESIZE;
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goto yesno;
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case _SC_RTSIG_MAX:
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_RTSIG_MAX;
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goto yesno;
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case _SC_SEM_NSEMS_MAX:
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_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_P1003_1B;
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mib[1] = CTL_P1003_1B_SEM_VALUE_MAX;
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goto yesno;
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case _SC_SIGQUEUE_MAX:
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
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goto yesno;
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case _SC_TIMER_MAX:
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mib[0] = CTL_P1003_1B;
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mib[1] = CTL_P1003_1B_TIMER_MAX;
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yesno:
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len = sizeof(value);
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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 (defaultresult);
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return ((long)value);
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case _SC_2_PBS:
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case _SC_2_PBS_ACCOUNTING:
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case _SC_2_PBS_CHECKPOINT:
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case _SC_2_PBS_LOCATE:
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case _SC_2_PBS_MESSAGE:
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case _SC_2_PBS_TRACK:
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#if _POSIX2_PBS == 0
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#error "don't know how to determine _SC_2_PBS"
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/*
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* This probably requires digging through the filesystem
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* to see if the appropriate package has been installed.
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* Since we don't currently support this option at all,
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* it's not worth the effort to write the code now.
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* Figuring out which of the sub-options are supported
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* would be even more difficult, so it's probably easier
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* to always say ``no''.
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*/
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#else
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return (_POSIX2_PBS);
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#endif
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case _SC_ADVISORY_INFO:
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#if _POSIX_ADVISORY_INFO == 0
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#error "_POSIX_ADVISORY_INFO"
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#else
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return (_POSIX_ADVISORY_INFO);
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#endif
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case _SC_BARRIERS:
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#if _POSIX_BARRIERS == 0
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#error "_POSIX_BARRIERS"
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#else
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return (_POSIX_BARRIERS);
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#endif
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case _SC_CLOCK_SELECTION:
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#if _POSIX_CLOCK_SELECTION == 0
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#error "_POSIX_CLOCK_SELECTION"
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|
#else
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return (_POSIX_CLOCK_SELECTION);
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#endif
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case _SC_CPUTIME:
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#if _POSIX_CPUTIME == 0
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#error "_POSIX_CPUTIME"
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|
#else
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return (_POSIX_CPUTIME);
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#endif
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#ifdef notdef
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case _SC_FILE_LOCKING:
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/*
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* XXX - The standard doesn't tell us how to define
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* _POSIX_FILE_LOCKING, so we can't answer this one.
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*/
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|
#endif
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#if _POSIX_THREAD_SAFE_FUNCTIONS > -1
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case _SC_GETGR_R_SIZE_MAX:
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|
case _SC_GETPW_R_SIZE_MAX:
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|
#error "somebody needs to implement this"
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|
#endif
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case _SC_HOST_NAME_MAX:
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return (MAXHOSTNAMELEN - 1); /* does not include \0 */
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|
case _SC_LOGIN_NAME_MAX:
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|
return (MAXLOGNAME);
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|
case _SC_MONOTONIC_CLOCK:
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|
#if _POSIX_MONOTONIC_CLOCK == 0
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|
#error "_POSIX_MONOTONIC_CLOCK"
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|
#else
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|
return (_POSIX_MONOTONIC_CLOCK);
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|
#endif
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|
#if _POSIX_MESSAGE_PASSING > -1
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|
case _SC_MQ_PRIO_MAX:
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|
return (MQ_PRIO_MAX);
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|
#endif
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|
case _SC_READER_WRITER_LOCKS:
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|
return (_POSIX_READER_WRITER_LOCKS);
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|
case _SC_REGEXP:
|
|
return (_POSIX_REGEXP);
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|
case _SC_SHELL:
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|
return (_POSIX_SHELL);
|
|
case _SC_SPAWN:
|
|
return (_POSIX_SPAWN);
|
|
case _SC_SPIN_LOCKS:
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|
return (_POSIX_SPIN_LOCKS);
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|
case _SC_SPORADIC_SERVER:
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|
#if _POSIX_SPORADIC_SERVER == 0
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|
#error "_POSIX_SPORADIC_SERVER"
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|
#else
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|
return (_POSIX_SPORADIC_SERVER);
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|
#endif
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|
case _SC_THREAD_ATTR_STACKADDR:
|
|
return (_POSIX_THREAD_ATTR_STACKADDR);
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|
case _SC_THREAD_ATTR_STACKSIZE:
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|
return (_POSIX_THREAD_ATTR_STACKSIZE);
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|
case _SC_THREAD_CPUTIME:
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|
return (_POSIX_THREAD_CPUTIME);
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|
case _SC_THREAD_DESTRUCTOR_ITERATIONS:
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|
return (PTHREAD_DESTRUCTOR_ITERATIONS);
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|
case _SC_THREAD_KEYS_MAX:
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|
return (PTHREAD_KEYS_MAX);
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|
case _SC_THREAD_PRIO_INHERIT:
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|
return (_POSIX_THREAD_PRIO_INHERIT);
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|
case _SC_THREAD_PRIO_PROTECT:
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|
return (_POSIX_THREAD_PRIO_PROTECT);
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|
case _SC_THREAD_PRIORITY_SCHEDULING:
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|
return (_POSIX_THREAD_PRIORITY_SCHEDULING);
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|
case _SC_THREAD_PROCESS_SHARED:
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|
return (_POSIX_THREAD_PROCESS_SHARED);
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|
case _SC_THREAD_SAFE_FUNCTIONS:
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|
return (_POSIX_THREAD_SAFE_FUNCTIONS);
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|
case _SC_THREAD_STACK_MIN:
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|
return (PTHREAD_STACK_MIN);
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|
case _SC_THREAD_THREADS_MAX:
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|
return (PTHREAD_THREADS_MAX); /* XXX wrong type! */
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|
case _SC_TIMEOUTS:
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|
return (_POSIX_TIMEOUTS);
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|
case _SC_THREADS:
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|
return (_POSIX_THREADS);
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|
case _SC_TRACE:
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|
#if _POSIX_TRACE == 0
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|
#error "_POSIX_TRACE"
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|
/* While you're implementing this, also do the ones below. */
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|
#else
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return (_POSIX_TRACE);
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|
#endif
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#if _POSIX_TRACE > -1
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case _SC_TRACE_EVENT_FILTER:
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return (_POSIX_TRACE_EVENT_FILTER);
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|
case _SC_TRACE_INHERIT:
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|
return (_POSIX_TRACE_INHERIT);
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|
case _SC_TRACE_LOG:
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return (_POSIX_TRACE_LOG);
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|
#endif
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case _SC_TTY_NAME_MAX:
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|
path = _PATH_DEV;
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|
goto do_NAME_MAX;
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|
case _SC_TYPED_MEMORY_OBJECTS:
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#if _POSIX_TYPED_MEMORY_OBJECTS == 0
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|
#error "_POSIX_TYPED_MEMORY_OBJECTS"
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|
#else
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return (_POSIX_TYPED_MEMORY_OBJECTS);
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|
#endif
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case _SC_V6_ILP32_OFF32:
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|
#if _V6_ILP32_OFF32 == 0
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|
if (sizeof(int) * CHAR_BIT == 32 &&
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|
sizeof(int) == sizeof(long) &&
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|
sizeof(long) == sizeof(void *) &&
|
|
sizeof(void *) == sizeof(off_t))
|
|
return 1;
|
|
else
|
|
return -1;
|
|
#else
|
|
return (_V6_ILP32_OFF32);
|
|
#endif
|
|
case _SC_V6_ILP32_OFFBIG:
|
|
#if _V6_ILP32_OFFBIG == 0
|
|
if (sizeof(int) * CHAR_BIT == 32 &&
|
|
sizeof(int) == sizeof(long) &&
|
|
sizeof(long) == sizeof(void *) &&
|
|
sizeof(off_t) * CHAR_BIT >= 64)
|
|
return 1;
|
|
else
|
|
return -1;
|
|
#else
|
|
return (_V6_ILP32_OFFBIG);
|
|
#endif
|
|
case _SC_V6_LP64_OFF64:
|
|
#if _V6_LP64_OFF64 == 0
|
|
if (sizeof(int) * CHAR_BIT == 32 &&
|
|
sizeof(long) * CHAR_BIT == 64 &&
|
|
sizeof(long) == sizeof(void *) &&
|
|
sizeof(void *) == sizeof(off_t))
|
|
return 1;
|
|
else
|
|
return -1;
|
|
#else
|
|
return (_V6_LP64_OFF64);
|
|
#endif
|
|
case _SC_V6_LPBIG_OFFBIG:
|
|
#if _V6_LPBIG_OFFBIG == 0
|
|
if (sizeof(int) * CHAR_BIT >= 32 &&
|
|
sizeof(long) * CHAR_BIT >= 64 &&
|
|
sizeof(void *) * CHAR_BIT >= 64 &&
|
|
sizeof(off_t) * CHAR_BIT >= 64)
|
|
return 1;
|
|
else
|
|
return -1;
|
|
#else
|
|
return (_V6_LPBIG_OFFBIG);
|
|
#endif
|
|
case _SC_ATEXIT_MAX:
|
|
return (ATEXIT_SIZE);
|
|
case _SC_IOV_MAX:
|
|
mib[0] = CTL_KERN;
|
|
mib[1] = KERN_IOV_MAX;
|
|
break;
|
|
case _SC_XOPEN_CRYPT:
|
|
return (_XOPEN_CRYPT);
|
|
case _SC_XOPEN_ENH_I18N:
|
|
return (_XOPEN_ENH_I18N);
|
|
case _SC_XOPEN_LEGACY:
|
|
return (_XOPEN_LEGACY);
|
|
case _SC_XOPEN_REALTIME:
|
|
#if _XOPEN_REALTIME == 0
|
|
sverrno = errno;
|
|
value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 &&
|
|
sysconf(_SC_MEMLOCK) > 0 &&
|
|
sysconf(_SC_MEMLOCK_RANGE) > 0 &&
|
|
sysconf(_SC_MESSAGE_PASSING) > 0 &&
|
|
sysconf(_SC_PRIORITY_SCHEDULING) > 0 &&
|
|
sysconf(_SC_REALTIME_SIGNALS) > 0 &&
|
|
sysconf(_SC_SEMAPHORES) > 0 &&
|
|
sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 &&
|
|
sysconf(_SC_SYNCHRONIZED_IO) > 0 &&
|
|
sysconf(_SC_TIMERS) > 0;
|
|
errno = sverrno;
|
|
if (value)
|
|
return (200112L);
|
|
else
|
|
return (-1);
|
|
#else
|
|
return (_XOPEN_REALTIME);
|
|
#endif
|
|
case _SC_XOPEN_REALTIME_THREADS:
|
|
#if _XOPEN_REALTIME_THREADS == 0
|
|
#error "_XOPEN_REALTIME_THREADS"
|
|
#else
|
|
return (_XOPEN_REALTIME_THREADS);
|
|
#endif
|
|
case _SC_XOPEN_SHM:
|
|
len = sizeof(lvalue);
|
|
sverrno = errno;
|
|
if (sysctlbyname("kern.ipc.shmmin", &lvalue, &len, NULL,
|
|
0) == -1) {
|
|
errno = sverrno;
|
|
return (-1);
|
|
}
|
|
errno = sverrno;
|
|
return (1);
|
|
case _SC_XOPEN_STREAMS:
|
|
return (_XOPEN_STREAMS);
|
|
case _SC_XOPEN_UNIX:
|
|
return (_XOPEN_UNIX);
|
|
#ifdef _XOPEN_VERSION
|
|
case _SC_XOPEN_VERSION:
|
|
return (_XOPEN_VERSION);
|
|
#endif
|
|
#ifdef _XOPEN_XCU_VERSION
|
|
case _SC_XOPEN_XCU_VERSION:
|
|
return (_XOPEN_XCU_VERSION);
|
|
#endif
|
|
case _SC_SYMLOOP_MAX:
|
|
return (MAXSYMLINKS);
|
|
case _SC_RAW_SOCKETS:
|
|
return (_POSIX_RAW_SOCKETS);
|
|
case _SC_IPV6:
|
|
#if _POSIX_IPV6 == 0
|
|
sverrno = errno;
|
|
value = socket(PF_INET6, SOCK_DGRAM, 0);
|
|
errno = sverrno;
|
|
if (value >= 0) {
|
|
close(value);
|
|
return (200112L);
|
|
} else
|
|
return (0);
|
|
#else
|
|
return (_POSIX_IPV6);
|
|
#endif
|
|
|
|
case _SC_NPROCESSORS_CONF:
|
|
case _SC_NPROCESSORS_ONLN:
|
|
mib[0] = CTL_HW;
|
|
mib[1] = HW_NCPU;
|
|
break;
|
|
|
|
#ifdef _SC_PHYS_PAGES
|
|
case _SC_PHYS_PAGES:
|
|
len = sizeof(lvalue);
|
|
if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
|
|
return (-1);
|
|
return (lvalue);
|
|
#endif
|
|
|
|
default:
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
len = sizeof(value);
|
|
if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
|
|
value = -1;
|
|
return ((long)value);
|
|
}
|