librt/mq_receive.c

   1 /*
   2  * mq_receive.c - functions for receiving from message queue.
   3  */
   4
   5 #include <sys/syscall.h>
   6
   7 #ifdef __NR_mq_timedreceive
   8
   9 #include <stddef.h>
  10 #include <mqueue.h>
  11
  12 #ifdef __UCLIBC_HAS_THREADS_NATIVE__
  13 # ifndef __UCLIBC_HAS_ADVANCED_REALTIME__
  14 extern ssize_t mq_timedreceive(mqd_t mqdes, char *msg_ptr, size_t msg_len,
  15                                unsigned int *msg_prio,
  16                                const struct timespec *abs_timeout);
  17 # endif
  18 librt_hidden_proto(mq_timedreceive)
  19 #else
  20
  21 # define __NR___syscall_mq_timedreceive __NR_mq_timedreceive
  22 static _syscall5(int, __syscall_mq_timedreceive, int, mqdes,
  23                  char *, msg_ptr, size_t, msg_len, unsigned int *,
  24                  msg_prio, const void *, abs_timeout)
  25
  26 # ifdef __UCLIBC_HAS_ADVANCED_REALTIME__
  27 /*
  28  * Receive the oldest from highest priority messages.
  29  * Stop waiting if abs_timeout expires.
  30  */
  31 ssize_t mq_timedreceive(mqd_t mqdes, char *msg_ptr, size_t msg_len,
  32                         unsigned int *msg_prio,
  33                         const struct timespec *abs_timeout)
  34 {
  35         return __syscall_mq_timedreceive(mqdes, msg_ptr, msg_len, msg_prio,
  36                                          abs_timeout);
  37 }
  38 # endif
  39
  40 #endif
  41
  42 /* Receive the oldest from highest priority messages */
  43 ssize_t mq_receive(mqd_t mqdes, char *msg_ptr, size_t msg_len,
  44                    unsigned int *msg_prio)
  45 {
  46 #ifdef __UCLIBC_HAS_THREADS_NATIVE__
  47         return mq_timedreceive(mqdes, msg_ptr, msg_len, msg_prio, NULL);
  48 #else
  49         return __syscall_mq_timedreceive(mqdes, msg_ptr, msg_len, msg_prio, NULL);
  50 #endif
  51 }
  52
  53 #endif