bsd-user: Add do_bsd_msgctl implementation

Add implementation of msgctl(2) syscall for System V message queue control
operations. Handles command translation and structure conversions for
IPC_STAT/IPC_SET/IPC_RMID operations.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>

bsd-user/bsd-misc.h

@@ -213,6 +213,53 @@ out:
     return ret;
 }
 
+/* msgctl(2) */
+static inline abi_long do_bsd_msgctl(int msgid, int target_cmd, abi_long ptr)
+{
+    struct msqid_ds dsarg;
+    abi_long ret = -TARGET_EINVAL;
+    int host_cmd;
+
+    switch (target_cmd) {
+    case TARGET_IPC_STAT:
+        host_cmd = IPC_STAT;
+        break;
+
+    case TARGET_IPC_SET:
+        host_cmd = IPC_SET;
+        break;
+
+    case TARGET_IPC_RMID:
+        host_cmd = IPC_RMID;
+        break;
+
+    default:
+        return -TARGET_EINVAL;
+    }
+
+    switch (host_cmd) {
+    case IPC_STAT:
+    case IPC_SET:
+        if (target_to_host_msqid_ds(&dsarg, ptr)) {
+            return -TARGET_EFAULT;
+        }
+        ret = get_errno(msgctl(msgid, host_cmd, &dsarg));
+        if (host_to_target_msqid_ds(ptr, &dsarg)) {
+            return -TARGET_EFAULT;
+        }
+        break;
+
+    case IPC_RMID:
+        ret = get_errno(msgctl(msgid, host_cmd, NULL));
+        break;
+
+    default:
+        ret = -TARGET_EINVAL;
+        break;
+    }
+    return ret;
+}
+
 /* getdtablesize(2) */
 static inline abi_long do_bsd_getdtablesize(void)
 {