83 lines
1.4 KiB
C
83 lines
1.4 KiB
C
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/* sysconf.c POSIX 4.8.1
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* long int sysconf(int name);
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*
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* POSIX allows some of the values in <limits.h> to be increased at
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* run time. The sysconf() function allows such values to be checked
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* at run time. MINIX does not use this facility - the run time
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* limits are those given in <limits.h>.
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*/
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#include <sys/cdefs.h>
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#include "namespace.h"
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#include <lib.h>
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#include <unistd.h>
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#include <time.h>
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#include <stdio.h>
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#include <paths.h>
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#ifdef __weak_alias
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__weak_alias(sysconf, __sysconf)
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#endif
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PRIVATE u32_t get_hz(void)
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{
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FILE *fp;
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u32_t hz;
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int r;
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if ((fp = fopen(_PATH_PROC "hz", "r")) != NULL)
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{
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r = fscanf(fp, "%lu", &hz);
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fclose(fp);
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if (r == 1)
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return hz;
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}
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return DEFAULT_HZ;
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}
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PUBLIC long int sysconf(name)
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int name; /* property being inspected */
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{
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switch(name) {
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case _SC_ARG_MAX:
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return (long) ARG_MAX;
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case _SC_CHILD_MAX:
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return (long) CHILD_MAX;
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case _SC_CLK_TCK:
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return (long) get_hz();
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case _SC_NGROUPS_MAX:
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return (long) NGROUPS_MAX;
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case _SC_OPEN_MAX:
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return (long) OPEN_MAX;
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case _SC_JOB_CONTROL:
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return -1L; /* no job control */
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case _SC_SAVED_IDS:
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return -1L; /* no saved uid/gid */
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case _SC_VERSION:
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return (long) _POSIX_VERSION;
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case _SC_STREAM_MAX:
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return (long) STREAM_MAX;
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case _SC_TZNAME_MAX:
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return (long) TZNAME_MAX;
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case _SC_PAGESIZE:
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return getpagesize();
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default:
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errno = EINVAL;
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return -1L;
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}
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}
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