X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fipc%2Fsemctl.c;h=673a9a8c996b2bd18657b1dff7f6934ec34b2d69;hb=2e5d256984adb6864ece82fb689ddb2b20e10e4d;hp=49927e2ecff79539db21dde9fa47a30a32ae4269;hpb=289294220f278a291452332da8f45cf756f57fe5;p=musl

diff --git a/src/ipc/semctl.c b/src/ipc/semctl.c
index 49927e2e..673a9a8c 100644
--- a/src/ipc/semctl.c
+++ b/src/ipc/semctl.c
@@ -3,7 +3,7 @@
 #include "syscall.h"
 #include "ipc.h"
 
-struct semun {
+union semun {
 	int val;
 	struct semid_ds *buf;
 	unsigned short *array;
@@ -11,11 +11,15 @@ struct semun {
 
 int semctl(int id, int num, int cmd, ...)
 {
-	struct semun arg;
+	union semun arg = {0};
 	va_list ap;
-	va_start(ap, cmd);
-	arg = va_arg(ap, struct semun);
-	va_end(ap);
+	switch (cmd) {
+	case SETVAL: case GETALL: case SETALL: case IPC_STAT: case IPC_SET:
+	case IPC_INFO: case SEM_INFO: case SEM_STAT:
+		va_start(ap, cmd);
+		arg = va_arg(ap, union semun);
+		va_end(ap);
+	}
 #ifdef SYS_semctl
 	return syscall(SYS_semctl, id, num, cmd | IPC_64, arg.buf);
 #else