diff options
| author | Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> | 2010-01-23 14:15:33 +0100 |
|---|---|---|
| committer | Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> | 2010-08-05 23:42:40 +0200 |
| commit | 18af37f89cda98ba12521cbf0dd15e4537402134 (patch) | |
| tree | 538e8a597e752ba3f7151844e0eca1cf563e1577 /libc/unistd | |
| parent | 8faa445d364dda147146e2036f6460a5347736f0 (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.c | 80 |
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 |