/* sysconf.c POSIX 4.8.1

* long int sysconf(int name);

*

* POSIX allows some of the values in <limits.h> to be increased at

* run time. The sysconf() function allows such values to be checked

* at run time. MINIX does not use this facility - the run time

* limits are those given in <limits.h>.

*/

#include <sys/cdefs.h>

#include "namespace.h"

#include <lib.h>

#include <unistd.h>

#include <time.h>

#include <stdio.h>

#include <minix/paths.h>

#ifdef __weak_alias

__weak_alias(sysconf, __sysconf)

#endif

static u32_t get_hz(void)

{

FILE *fp;

u32_t hz;

int r;

if ((fp = fopen(_PATH_PROC "hz", "r")) != NULL)

{

r = fscanf(fp, "%u", &hz);

fclose(fp);

if (r == 1)

return hz;

}

return DEFAULT_HZ;

}

long int sysconf(name)

int name; /* property being inspected */

{

switch(name) {

case _SC_ARG_MAX:

return (long) ARG_MAX;

case _SC_CHILD_MAX:

return (long) CHILD_MAX;

case _SC_CLK_TCK:

return (long) get_hz();

case _SC_NGROUPS_MAX:

return (long) NGROUPS_MAX;

case _SC_OPEN_MAX:

return (long) OPEN_MAX;

case _SC_JOB_CONTROL:

return -1L; /* no job control */

case _SC_SAVED_IDS:

return -1L; /* no saved uid/gid */

case _SC_VERSION:

return (long) _POSIX_VERSION;

case _SC_STREAM_MAX:

return (long) _POSIX_STREAM_MAX;

case _SC_TZNAME_MAX:

return (long) _POSIX_TZNAME_MAX;

case _SC_PAGESIZE:

return getpagesize();

case _SC_LINE_MAX:

return (long) LINE_MAX;

default:

errno = EINVAL;

return -1L;

}

}