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authorBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2010-01-23 14:15:33 +0100
committerBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2010-08-05 23:42:40 +0200
commit18af37f89cda98ba12521cbf0dd15e4537402134 (patch)
tree538e8a597e752ba3f7151844e0eca1cf563e1577 /libc/unistd
parent8faa445d364dda147146e2036f6460a5347736f0 (diff)
sysconf: implement _SC_NPROCESSORS_CONF, _SC_NPROCESSORS_ONLN
perusing the config parser Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Diffstat (limited to 'libc/unistd')
-rw-r--r--libc/unistd/sysconf.c80
1 files changed, 72 insertions, 8 deletions
diff --git a/libc/unistd/sysconf.c b/libc/unistd/sysconf.c
index d118f1b95..be58f111f 100644
--- a/libc/unistd/sysconf.c
+++ b/libc/unistd/sysconf.c
@@ -39,14 +39,78 @@
#include <sys/resource.h>
#endif
+#include <string.h>
+#include <dirent.h>
+#include "internal/parse_config.h"
-#ifndef num_present_cpus
-# define num_present_cpus() (1)
-#endif
-#ifndef num_online_cpus
-# define num_online_cpus() (1)
-#endif
+static int nprocessors_onln(void)
+{
+ char **l = NULL;
+ parser_t *p = config_open("/proc/stat");
+ int ret = 0;
+
+ if (p) {
+ while (config_read(p, &l, 2, 1, " ", 0))
+ if (l[0][0] == 'c'
+ && l[0][1] == 'p'
+ && l[0][2] == 'u'
+ && isdigit(l[0][3]))
+ ++ret;
+ } else if ((p = config_open("/proc/cpuinfo"))) {
+#if defined __sparc__
+ while (config_read(p, &l, 2, 2, "\0:", PARSE_NORMAL))
+ if (strncmp("ncpus active", l[0], 12) == 0) {
+ ret = atoi(l[1]);
+ break;
+ }
+#else
+ while (config_read(p, &l, 2, 2, "\0:\t", PARSE_NORMAL))
+ if (strcmp("processor", l[0]) == 0)
+ ++ret;
+#endif
+ }
+ config_close(p);
+ return ret != 0 ? ret : 1;
+}
+#if defined __UCLIBC__ && !defined __UCLIBC_HAS_LFS__
+# define readdir64 readdir
+# define dirent64 dirent
+#endif
+static int nprocessors_conf(void)
+{
+ int ret = 0;
+ DIR *dir = opendir("/sys/devices/system/cpu");
+
+ if (dir) {
+ struct dirent64 *dp;
+
+ while ((dp = readdir64(dir))) {
+ if (dp->d_type == DT_DIR
+ && dp->d_name[0] == 'c'
+ && dp->d_name[1] == 'p'
+ && dp->d_name[2] == 'u'
+ && isdigit(dp->d_name[3]))
+ ++ret;
+ }
+ closedir(dir);
+ } else
+ {
+#if defined __sparc__
+ char **l = NULL;
+ parser_t *p = config_open("/proc/stat");
+ while (config_read(p, &l, 2, 2, "\0:", PARSE_NORMAL))
+ if (strncmp("ncpus probed", l[0], 13) == 0) {
+ ret = atoi(l[1]);
+ break;
+ }
+ config_close(p);
+#else
+ ret = nprocessors_onln();
+#endif
+ }
+ return ret != 0 ? ret : 1;
+}
#ifndef __UCLIBC_CLK_TCK_CONST
@@ -679,10 +743,10 @@ long int sysconf(int name)
#endif
case _SC_NPROCESSORS_CONF:
- RETURN_FUNCTION(num_present_cpus());
+ RETURN_FUNCTION(nprocessors_conf());
case _SC_NPROCESSORS_ONLN:
- RETURN_FUNCTION(num_online_cpus());
+ RETURN_FUNCTION(nprocessors_onln());
case _SC_PHYS_PAGES:
#if 0