convert ioctl time64 fallbacks to table-driven framework

[musl] / src / thread / pthread_mutexattr_setrobust.c

diff --git a/src/thread/pthread_mutexattr_setrobust.c b/src/thread/pthread_mutexattr_setrobust.c
index dcfa4cf..04db92a 100644 (file)
--- a/src/thread/pthread_mutexattr_setrobust.c
+++ b/src/thread/pthread_mutexattr_setrobust.c
@@ -1,9 +1,25 @@
 #include "pthread_impl.h"
+#include "syscall.h"
+
+static pthread_once_t check_robust_once;
+static int check_robust_result;
+
+static void check_robust()
+{
+       void *p;
+       size_t l;
+       check_robust_result = -__syscall(SYS_get_robust_list, 0, &p, &l);
+}
 
 int pthread_mutexattr_setrobust(pthread_mutexattr_t *a, int robust)
 {
        if (robust > 1U) return EINVAL;
+       if (robust) {
+               pthread_once(&check_robust_once, check_robust);
+               if (check_robust_result) return check_robust_result;
+               a->__attr |= 4;
+               return 0;
+       }
        a->__attr &= ~4;
-       a->__attr |= robust*4;
        return 0;
 }