From: David van Moolenbroek <david@minix3.org>
Date: Tue, 14 Sep 2010 21:28:34 +0000 (+0000)
Subject: make library calls use ProcFS
X-Git-Tag: v3.2.0~877
X-Git-Url: http://zhaoyanbai.com/repos/icons/debian/static/datamaps.china.min.js?a=commitdiff_plain;h=d7b10963c2578ce2b7a3e36ff0a49b87b48f1cc7;p=minix.git

make library calls use ProcFS
---

diff --git a/lib/libc/other/sysconf.c b/lib/libc/other/sysconf.c
index 51d00dd8d..f70b2f179 100644
--- a/lib/libc/other/sysconf.c
+++ b/lib/libc/other/sysconf.c
@@ -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;
diff --git a/lib/libc/posix/getloadavg.c b/lib/libc/posix/getloadavg.c
index 70253473b..c19f3a4d5 100644
--- a/lib/libc/posix/getloadavg.c
+++ b/lib/libc/posix/getloadavg.c
@@ -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;
-	}
-  }
-
-  loadsize = sizeof(loadinfo);
-  if((l=getsysinfo_up(PM_PROC_NR, SIU_LOADINFO, loadsize, &loadinfo)) < 0)
-	return -1;
-  if(l != sizeof(loadinfo))
+  if((fp = fopen(_PATH_PROC "/loadavg", "r")) == NULL)
 	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(i = 0; i < nelem; i++)
+	if(fscanf(fp, "%lf", &loadavg[i]) != 1)
+		break;
 
-  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;
+  fclose(fp);
 
-    /* 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);
+  if (i == 0) {
+	errno = ENOENT;
+	return -1;
   }
 
-  return nelem;
+  return i;
 }
-