1 files changed, 51 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/ipc/shmctl.c b/libc-top-half/musl/src/ipc/shmctl.c
new file mode 100644
index 0000000..1c9f78c
--- /dev/null
+++ b/libc-top-half/musl/src/ipc/shmctl.c
@@ -0,0 +1,51 @@
+#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)
+{
+#if IPC_TIME64
+	struct shmid_ds out, *orig;
+	if (cmd&IPC_TIME64) {
+		out = (struct shmid_ds){0};
+		orig = buf;
+		buf = &out;
+	}
+#endif
+#ifdef SYSCALL_IPC_BROKEN_MODE
+	struct shmid_ds tmp;
+	if (cmd == IPC_SET) {
+		tmp = *buf;
+		tmp.shm_perm.mode *= 0x10000U;
+		buf = &tmp;
+	}
+#endif
+#ifndef SYS_ipc
+	int r = __syscall(SYS_shmctl, id, IPC_CMD(cmd), buf);
+#else
+	int r = __syscall(SYS_ipc, IPCOP_shmctl, id, IPC_CMD(cmd), 0, buf, 0);
+#endif
+#ifdef SYSCALL_IPC_BROKEN_MODE
+	if (r >= 0) switch (cmd | IPC_TIME64) {
+	case IPC_STAT:
+	case SHM_STAT:
+	case SHM_STAT_ANY:
+		buf->shm_perm.mode >>= 16;
+	}
+#endif
+#if IPC_TIME64
+	if (r >= 0 && (cmd&IPC_TIME64)) {
+		buf = orig;
+		*buf = out;
+		IPC_HILO(buf, shm_atime);
+		IPC_HILO(buf, shm_dtime);
+		IPC_HILO(buf, shm_ctime);
+	}
+#endif
+	return __syscall_ret(r);
+}