getservbyport_r: fix wrong result if getnameinfo fails with EAI_OVERFLOW

[musl] / src / thread / pthread_mutexattr_setprotocol.c

diff --git a/src/thread/pthread_mutexattr_setprotocol.c b/src/thread/pthread_mutexattr_setprotocol.c
index c92a31c..8b80c1c 100644 (file)
--- a/src/thread/pthread_mutexattr_setprotocol.c
+++ b/src/thread/pthread_mutexattr_setprotocol.c
@@ -1,7 +1,28 @@
 #include "pthread_impl.h"
+#include "syscall.h"
+
+static volatile int check_pi_result = -1;
 
 int pthread_mutexattr_setprotocol(pthread_mutexattr_t *a, int protocol)
 {
-       if (protocol) return ENOTSUP;
-       return 0;
+       int r;
+       switch (protocol) {
+       case PTHREAD_PRIO_NONE:
+               a->__attr &= ~8;
+               return 0;
+       case PTHREAD_PRIO_INHERIT:
+               r = check_pi_result;
+               if (r < 0) {
+                       volatile int lk = 0;
+                       r = -__syscall(SYS_futex, &lk, FUTEX_LOCK_PI, 0, 0);
+                       a_store(&check_pi_result, r);
+               }
+               if (r) return r;
+               a->__attr |= 8;
+               return 0;
+       case PTHREAD_PRIO_PROTECT:
+               return ENOTSUP;
+       default:
+               return EINVAL;
+       }
 }