Patch from Paul Mundt (lethal) adding an initial librt implementation.

I then reworked the syscall handling and made minor cleanups.  With luck
I've not completely broken his patch...

1 files changed, 36 insertions, 0 deletions

diff --git a/librt/mq_receive.c b/librt/mq_receive.c
new file mode 100644
index 000000000..4dd81f5e7
--- /dev/null
+++ b/librt/mq_receive.c
@@ -0,0 +1,36 @@
+/*
+ * mq_receive.c - functions for receiving from message queue.
+ */
+
+#include <errno.h>
+#include <stddef.h>
+#include <sys/syscall.h>
+
+#include <mqueue.h>
+
+#ifdef __NR_mq_timedreceive
+
+#define __NR___syscall_mq_timedreceive __NR_mq_timedreceive
+static inline _syscall5(int, __syscall_mq_timedreceive, int, mqdes,
+	char *, msg_ptr, size_t, msg_len, unsigned int *, msg_prio,
+	const void *, abs_timeout);
+
+/*
+ * Receive the oldest from highest priority messages.
+ * Stop waiting if abs_timeout expires.
+ */
+ssize_t mq_timedreceive(mqd_t mqdes, char *msg_ptr, size_t msg_len,
+			unsigned int *msg_prio,
+			const struct timespec *abs_timeout)
+{
+    return __syscall_mq_timedreceive(mqdes, msg_ptr, msg_len, msg_prio, abs_timeout);
+}
+
+/* Receive the oldest from highest priority messages */
+ssize_t mq_receive(mqd_t mqdes, char *msg_ptr, size_t msg_len,
+			unsigned int *msg_prio)
+{
+    return mq_timedreceive(mqdes, msg_ptr, msg_len, msg_prio, NULL);
+}
+
+#endif