sysconf support for dynamic limits (open files and processes)

diff --git a/src/conf/sysconf.c b/src/conf/sysconf.c
index 28232a77e6b490ff9132d4f31ad02d5ec7ef57b2..5b6c14e520f2c97e93bfc753e632cd6ae76221e9 100644 (file)
--- a/src/conf/sysconf.c
+++ b/src/conf/sysconf.c
@@ -1,18 +1,21 @@
 #include <unistd.h>
 #include <limits.h>
 #include <errno.h>
+#include <sys/resource.h>
+#include "syscall.h"
 
 #define VER (-2)
 #define OFLOW (-3)
+#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,
@@ -217,6 +220,10 @@ 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] < 0) {
+               long lim[2];
+               __syscall(SYS_getrlimit, values[name]&16383, lim);
+               return lim[0] < 0 ? LONG_MAX : lim[0];
        }
        return values[name];
 }