glibc/sysdeps/unix/sysv/linux/mq_timedreceive.c

/* Receive a message from a message queue with a timeout.  Linux version.
   Copyright (C) 2017-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <mqueue.h>
#include <sysdep-cancel.h>

/* Receive the oldest from highest priority messages in message queue
   MQDES, stop waiting if ABS_TIMEOUT expires.  */
ssize_t
__mq_timedreceive_time64 (mqd_t mqdes, char *__restrict msg_ptr, size_t msg_len,
                          unsigned int *__restrict msg_prio,
                          const struct __timespec64 *__restrict abs_timeout)
{
#ifndef __NR_mq_timedreceive_time64
# define __NR_mq_timedreceive_time64 __NR_mq_timedreceive
#endif
  int ret = SYSCALL_CANCEL (mq_timedreceive_time64, mqdes, msg_ptr, msg_len,
                            msg_prio, abs_timeout);

#ifndef __ASSUME_TIME64_SYSCALLS
  if (ret == 0 || errno != ENOSYS)
    return ret;

  struct timespec ts32;
  if (abs_timeout != NULL)
    {
      if (! in_time_t_range (abs_timeout->tv_sec))
        {
          __set_errno (EOVERFLOW);
          return -1;
        }

      ts32 = valid_timespec64_to_timespec (*abs_timeout);
    }

  ret = SYSCALL_CANCEL (mq_timedreceive, mqdes, msg_ptr, msg_len, msg_prio,
			abs_timeout != NULL ? &ts32 : NULL);
#endif

  return ret;
}

#if __TIMESIZE != 64
librt_hidden_def (__mq_timedreceive_time64)

ssize_t
__mq_timedreceive (mqd_t mqdes, char *__restrict msg_ptr, size_t msg_len,
                   unsigned int *__restrict msg_prio,
                   const struct timespec *__restrict abs_timeout)
{
  struct __timespec64 ts64;
  if (abs_timeout != NULL)
    ts64 = valid_timespec_to_timespec64 (*abs_timeout);

  return __mq_timedreceive_time64 (mqdes, msg_ptr, msg_len, msg_prio,
                                   abs_timeout != NULL ? &ts64 : NULL);
}
#endif

hidden_def (__mq_timedreceive)
weak_alias (__mq_timedreceive, mq_timedreceive)
hidden_weak (mq_timedreceive)