document in sysconf and unistd.h that per-thread cpu clocks exist

[musl] / src / conf / sysconf.c

diff --git a/src/conf/sysconf.c b/src/conf/sysconf.c
index 28232a7..4819ae6 100644 (file)
--- a/src/conf/sysconf.c
+++ b/src/conf/sysconf.c
@@ -1,18 +1,22 @@
 #include <unistd.h>
 #include <limits.h>
 #include <errno.h>
+#include <sys/resource.h>
+#include "syscall.h"
 
 #define VER (-2)
 #define OFLOW (-3)
+#define CPUCNT (-4)
+#define RLIM(x) (-32768|(RLIMIT_ ## x))
 
 long sysconf(int name)
 {
        static const short values[] = {
                [_SC_ARG_MAX] = OFLOW,
-               [_SC_CHILD_MAX] = -1,
+               [_SC_CHILD_MAX] = RLIM(NPROC),
                [_SC_CLK_TCK] = 100,
                [_SC_NGROUPS_MAX] = 32,
-               [_SC_OPEN_MAX] = 1024,
+               [_SC_OPEN_MAX] = RLIM(NOFILE),
                [_SC_STREAM_MAX] = -1,
                [_SC_TZNAME_MAX] = TZNAME_MAX,
                [_SC_JOB_CONTROL] = 1,
@@ -85,14 +89,14 @@ long sysconf(int name)
                [_SC_THREAD_KEYS_MAX] = PTHREAD_KEYS_MAX,
                [_SC_THREAD_STACK_MIN] = PTHREAD_STACK_MIN,
                [_SC_THREAD_THREADS_MAX] = -1,
-               [_SC_THREAD_ATTR_STACKADDR] = -1,
+               [_SC_THREAD_ATTR_STACKADDR] = VER,
                [_SC_THREAD_ATTR_STACKSIZE] = VER,
-               [_SC_THREAD_PRIORITY_SCHEDULING] = -1,
+               [_SC_THREAD_PRIORITY_SCHEDULING] = VER,
                [_SC_THREAD_PRIO_INHERIT] = -1,
                [_SC_THREAD_PRIO_PROTECT] = -1,
                [_SC_THREAD_PROCESS_SHARED] = VER,
-               [_SC_NPROCESSORS_CONF] = -1,
-               [_SC_NPROCESSORS_ONLN] = -1,
+               [_SC_NPROCESSORS_CONF] = CPUCNT,
+               [_SC_NPROCESSORS_ONLN] = CPUCNT,
                [_SC_PHYS_PAGES] = -1,
                [_SC_AVPHYS_PAGES] = -1,
                [_SC_ATEXIT_MAX] = -1,
@@ -147,7 +151,7 @@ long sysconf(int name)
                [_SC_C_LANG_SUPPORT_R] = -1,
                [_SC_CLOCK_SELECTION] = VER,
                [_SC_CPUTIME] = VER,
-               [_SC_THREAD_CPUTIME] = -1,
+               [_SC_THREAD_CPUTIME] = VER,
                [_SC_DEVICE_IO] = -1,
                [_SC_DEVICE_SPECIFIC] = -1,
                [_SC_DEVICE_SPECIFIC_R] = -1,
@@ -217,6 +221,17 @@ long sysconf(int name)
        } else if (values[name] == OFLOW) {
                if (name == _SC_ARG_MAX) return ARG_MAX;
                if (name == _SC_SEM_VALUE_MAX) return SEM_VALUE_MAX;
+       } else if (values[name] == CPUCNT) {
+               unsigned char set[128] = {1};
+               int i, cnt;
+               __syscall(SYS_sched_getaffinity, 0, sizeof set, set);
+               for (i=cnt=0; i<sizeof set; i++)
+                       for (; set[i]; set[i]&=set[i]-1, cnt++);
+               return cnt;
+       } else if (values[name] < OFLOW) {
+               long lim[2];
+               __syscall(SYS_getrlimit, values[name]&16383, lim);
+               return lim[0] < 0 ? LONG_MAX : lim[0];
        }
        return values[name];
 }