work around broken kernel struct ipc_perm on some big endian archs

[oweals/musl.git] / src / ipc / msgctl.c

diff --git a/src/ipc/msgctl.c b/src/ipc/msgctl.c
index 4372c71939cad44717423282cc6382842ffed1bd..ea9b23377e47dad684ae1e7cc72df2cab81faf4c 100644 (file)
--- a/src/ipc/msgctl.c
+++ b/src/ipc/msgctl.c
@@ -1,12 +1,34 @@
 #include <sys/msg.h>
+#include <endian.h>
 #include "syscall.h"
 #include "ipc.h"
 
+#if __BYTE_ORDER != __BIG_ENDIAN
+#undef SYSCALL_IPC_BROKEN_MODE
+#endif
+
 int msgctl(int q, int cmd, struct msqid_ds *buf)
 {
+#ifdef SYSCALL_IPC_BROKEN_MODE
+       struct msqid_ds tmp;
+       if (cmd == IPC_SET) {
+               tmp = *buf;
+               tmp.msg_perm.mode *= 0x10000U;
+               buf = &tmp;
+       }
+#endif
 #ifdef SYS_msgctl
-       return syscall(SYS_msgctl, q, cmd | IPC_64, buf);
+       int r = __syscall(SYS_msgctl, q, cmd | IPC_64, buf);
 #else
-       return syscall(SYS_ipc, IPCOP_msgctl, q, cmd | IPC_64, 0, buf, 0);
+       int r = __syscall(SYS_ipc, IPCOP_msgctl, q, cmd | IPC_64, 0, buf, 0);
+#endif
+#ifdef SYSCALL_IPC_BROKEN_MODE
+       if (r >= 0) switch (cmd) {
+       case IPC_STAT:
+       case MSG_STAT:
+       case MSG_STAT_ANY:
+               buf->msg_perm.mode >>= 16;
+       }
 #endif
+       return __syscall_ret(r);
 }