work around broken kernel struct ipc_perm on some big endian archs

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

diff --git a/src/ipc/shmctl.c b/src/ipc/shmctl.c
index e2879f20aa8009e15f4b0851a9bf749f4e3dd4ad..c951a58156c92446510e2a98e64ea7a558e2eb83 100644 (file)
--- a/src/ipc/shmctl.c
+++ b/src/ipc/shmctl.c
@@ -1,12 +1,34 @@
 #include <sys/shm.h>
+#include <endian.h>
 #include "syscall.h"
 #include "ipc.h"
 
+#if __BYTE_ORDER != __BIG_ENDIAN
+#undef SYSCALL_IPC_BROKEN_MODE
+#endif
+
 int shmctl(int id, int cmd, struct shmid_ds *buf)
 {
+#ifdef SYSCALL_IPC_BROKEN_MODE
+       struct shmid_ds tmp;
+       if (cmd == IPC_SET) {
+               tmp = *buf;
+               tmp.shm_perm.mode *= 0x10000U;
+               buf = &tmp;
+       }
+#endif
 #ifdef SYS_shmctl
-       return syscall(SYS_shmctl, id, cmd | IPC_64, buf);
+       int r = __syscall(SYS_shmctl, id, cmd | IPC_64, buf);
 #else
-       return syscall(SYS_ipc, IPCOP_shmctl, id, cmd | IPC_64, 0, buf, 0);
+       int r = __syscall(SYS_ipc, IPCOP_shmctl, id, cmd | IPC_64, 0, buf, 0);
+#endif
+#ifdef SYSCALL_IPC_BROKEN_MODE
+       if (r >= 0) switch (cmd) {
+       case IPC_STAT:
+       case SHM_STAT:
+       case SHM_STAT_ANY:
+               buf->shm_perm.mode >>= 16;
+       }
 #endif
+       return __syscall_ret(r);
 }