From 2e0c1fed36be1f1435de79bfc7cdc34824cb5614 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Thu, 22 Mar 2012 01:00:35 -0400
Subject: sysconf support for dynamic limits (open files and processes)
---
src/conf/sysconf.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
(limited to 'src')
diff --git a/src/conf/sysconf.c b/src/conf/sysconf.c
index 28232a77..5b6c14e5 100644
--- 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];
}
--
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