diff options
Diffstat (limited to 'lib/libc/gen/sysconf.c')
| -rw-r--r-- | lib/libc/gen/sysconf.c | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/lib/libc/gen/sysconf.c b/lib/libc/gen/sysconf.c new file mode 100644 index 0000000..2298bb1 --- /dev/null +++ b/lib/libc/gen/sysconf.c @@ -0,0 +1,299 @@ +/*- + * 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. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)sysconf.c 8.2 (Berkeley) 3/20/94"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/_posix.h> +#include <sys/param.h> +#include <sys/time.h> +#include <sys/sysctl.h> +#include <sys/resource.h> + +#include <errno.h> +#include <time.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; + long defaultresult; + + len = sizeof(value); + defaultresult = -1; + + 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_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; + goto yesno; + +#ifdef _P1003_1B_VISIBLE + /* POSIX.1B */ + + case _SC_ASYNCHRONOUS_IO: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO; + goto yesno; + case _SC_MAPPED_FILES: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_MAPPED_FILES; + goto yesno; + case _SC_MEMLOCK: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_MEMLOCK; + goto yesno; + case _SC_MEMLOCK_RANGE: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_MEMLOCK_RANGE; + goto yesno; + case _SC_MEMORY_PROTECTION: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_MEMORY_PROTECTION; + goto yesno; + case _SC_MESSAGE_PASSING: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_MESSAGE_PASSING; + goto yesno; + case _SC_PRIORITIZED_IO: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_PRIORITIZED_IO; + goto yesno; + case _SC_PRIORITY_SCHEDULING: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING; + goto yesno; + case _SC_REALTIME_SIGNALS: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_REALTIME_SIGNALS; + goto yesno; + case _SC_SEMAPHORES: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_SEMAPHORES; + goto yesno; + case _SC_FSYNC: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_FSYNC; + goto yesno; + case _SC_SHARED_MEMORY_OBJECTS: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_SHARED_MEMORY_OBJECTS; + goto yesno; + case _SC_SYNCHRONIZED_IO: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO; + goto yesno; + case _SC_TIMERS: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_TIMERS; + goto yesno; + case _SC_AIO_LISTIO_MAX: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX; + goto yesno; + case _SC_AIO_MAX: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_AIO_MAX; + goto yesno; + case _SC_AIO_PRIO_DELTA_MAX: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX; + goto yesno; + case _SC_DELAYTIMER_MAX: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_DELAYTIMER_MAX; + goto yesno; + case _SC_MQ_OPEN_MAX: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_MQ_OPEN_MAX; + goto yesno; + case _SC_PAGESIZE: + defaultresult = getpagesize(); + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_PAGESIZE; + goto yesno; + case _SC_RTSIG_MAX: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_RTSIG_MAX; + goto yesno; + case _SC_SEM_NSEMS_MAX: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX; + goto yesno; + case _SC_SEM_VALUE_MAX: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_SEM_VALUE_MAX; + goto yesno; + case _SC_SIGQUEUE_MAX: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_SIGQUEUE_MAX; + goto yesno; + case _SC_TIMER_MAX: + mib[0] = CTL_P1003_1B; + mib[1] = CTL_P1003_1B_TIMER_MAX; + goto yesno; +#endif /* _P1003_1B_VISIBLE */ + +yesno: if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) + return (-1); + if (value == 0) + return (defaultresult); + return (value); + break; + default: + errno = EINVAL; + return (-1); + } + return (sysctl(mib, 2, &value, &len, NULL, 0) == -1 ? -1 : value); +} |
