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make library calls use ProcFS

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This commit is contained in:
David van Moolenbroek 2010-09-14 21:28:34 +00:00
parent d269f5fb90
commit d7b10963c2
2 changed files with 39 additions and 54 deletions
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23
lib/libc/other/sysconf.c
View file

@ -10,6 +10,27 @@
#include <lib.h>
#include <unistd.h>
#include <time.h>
#include <stdio.h>
#include <minix/paths.h>
PRIVATE u32_t get_hz(void)
{
FILE *fp;
u32_t hz;
int r;
if ((fp = fopen(_PATH_PROC "/hz", "r")) != NULL)
{
r = fscanf(fp, "%lu", &hz);
fclose(fp);
if (r == 1)
return hz;
}
return DEFAULT_HZ;
}
PUBLIC long int sysconf(name)
int name; /* property being inspected */
@ -22,7 +43,7 @@ int name; /* property being inspected */
return (long) CHILD_MAX;
case _SC_CLK_TCK:
return (long) CLOCKS_PER_SEC;
return (long) get_hz();
case _SC_NGROUPS_MAX:
return (long) NGROUPS_MAX;

70
lib/libc/posix/getloadavg.c
View file

@ -1,71 +1,35 @@
#include <sys/types.h>
#include <minix/sysinfo.h>
#include <minix/paths.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <lib.h>
/* Retrieve system load average information. */
int getloadavg(double *loadavg, int nelem)
{
struct loadinfo loadinfo;
static u32_t system_hz = 0;
int h, p, unfilled_ticks;
#define PERIODS 3
int minutes[3] = { 1, 5, 15 };
size_t loadsize;
ssize_t l;
FILE *fp;
int i;
if(nelem < 1) {
errno = ENOSPC;
return -1;
}
if(system_hz == 0) {
if((getsysinfo_up(PM_PROC_NR, SIU_SYSTEMHZ,
sizeof(system_hz), &system_hz)) < 0) {
system_hz = DEFAULT_HZ;
}
if((fp = fopen(_PATH_PROC "/loadavg", "r")) == NULL)
return -1;
for(i = 0; i < nelem; i++)
if(fscanf(fp, "%lf", &loadavg[i]) != 1)
break;
fclose(fp);
if (i == 0) {
errno = ENOENT;
return -1;
}
loadsize = sizeof(loadinfo);
if((l=getsysinfo_up(PM_PROC_NR, SIU_LOADINFO, loadsize, &loadinfo)) < 0)
return -1;
if(l != sizeof(loadinfo))
return -1;
if(nelem > PERIODS)
nelem = PERIODS;
/* How many ticks are missing from the newest-filled slot? */
#define TICKSPERSLOT (_LOAD_UNIT_SECS * system_hz)
unfilled_ticks = TICKSPERSLOT - (loadinfo.last_clock % TICKSPERSLOT);
for(p = 0; p < nelem; p++) {
int h, slots;
double l = 0.0;
int latest = loadinfo.proc_last_slot;
slots = minutes[p] * 60 / _LOAD_UNIT_SECS;
/* Add up the total number of process ticks for this number
* of minutes (minutes[p]). Start with the newest slot, which
* is latest, and count back for the number of slots that
* correspond to the right number of minutes. Take wraparound
* into account by calculating the index modulo _LOAD_HISTORY,
* which is the number of slots of history kept.
*/
for(h = 0; h < slots; h++) {
int slot;
slot = (latest - h + _LOAD_HISTORY) % _LOAD_HISTORY;
l += (double) loadinfo.proc_load_history[slot];
}
/* The load average over this number of minutes is the number of
* process-ticks divided by the number of ticks, not counting the
* number of ticks the last slot hasn't been around yet.
*/
loadavg[p] = l / (slots * TICKSPERSLOT - unfilled_ticks);
}
return nelem;
return i;
}