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-rw-r--r--libc/unistd/sysconf.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/libc/unistd/sysconf.c b/libc/unistd/sysconf.c
index b7cb4946f..d118f1b95 100644
--- a/libc/unistd/sysconf.c
+++ b/libc/unistd/sysconf.c
@@ -36,6 +36,8 @@
#endif
#ifdef __UCLIBC_HAS_THREADS_NATIVE__
#include <sysdep.h>
+#include <sys/resource.h>
+
#endif
#ifndef num_present_cpus
@@ -81,9 +83,16 @@
#define RETURN_FUNCTION(f) return f;
#endif /* _UCLIBC_GENERATE_SYSCONF_ARCH */
+/* Legacy value of ARG_MAX. The macro is now not defined since the
+ actual value varies based on the stack size. */
+#define legacy_ARG_MAX 131072
+
/* Get the value of the system variable NAME. */
long int sysconf(int name)
{
+#ifdef __UCLIBC_HAS_THREADS_NATIVE__
+ struct rlimit rlimit;
+#endif
switch (name)
{
default:
@@ -91,7 +100,11 @@ long int sysconf(int name)
return -1;
case _SC_ARG_MAX:
-#ifdef ARG_MAX
+#ifdef __UCLIBC_HAS_THREADS_NATIVE__
+ /* Use getrlimit to get the stack limit. */
+ if (getrlimit (RLIMIT_STACK, &rlimit) == 0)
+ return MAX (legacy_ARG_MAX, rlimit.rlim_cur / 4);
+#elif defined ARG_MAX
return ARG_MAX;
#else
RETURN_NEG_1;