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>
#include <shlib-compat.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

#ifdef __ASSUME_TIME64_SYSCALLS
  return SYSCALL_CANCEL (mq_timedreceive_time64, mqdes, msg_ptr, msg_len,
			 msg_prio, abs_timeout);
#else
  bool need_time64 = abs_timeout != NULL
		     && !in_time_t_range (abs_timeout->tv_sec);
  if (need_time64)
    {
      int r = SYSCALL_CANCEL (mq_timedreceive_time64, mqdes, msg_ptr, msg_len,
			      msg_prio, abs_timeout);
      if (r == 0 || errno != ENOSYS)
	return r;
      __set_errno (EOVERFLOW);
      return -1;
    }

  struct timespec ts32, *pts32 = NULL;
  if (abs_timeout != NULL)
    {
      ts32 = valid_timespec64_to_timespec (*abs_timeout);
      pts32 = &ts32;
    }

  return SYSCALL_CANCEL (mq_timedreceive, mqdes, msg_ptr, msg_len, msg_prio,
			 pts32);
#endif
}

#if __TIMESIZE == 64
versioned_symbol (libc, ___mq_timedreceive_time64, mq_timedreceive, GLIBC_2_34);
libc_hidden_ver (___mq_timedreceive_time64, __mq_timedreceive)
# ifndef SHARED
strong_alias (___mq_timedreceive_time64, __mq_timedreceive)
# endif
# if OTHER_SHLIB_COMPAT (librt, GLIBC_2_3_4, GLIBC_2_34)
compat_symbol (librt, ___mq_timedreceive_time64, mq_timedreceive, GLIBC_2_3_4);
# endif

#else /* __TIMESIZE != 64 */
libc_hidden_ver (___mq_timedreceive_time64, __mq_timedreceive_time64)
versioned_symbol (libc, ___mq_timedreceive_time64, __mq_timedreceive_time64,
		  GLIBC_2_34);

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);
}
versioned_symbol (libc, ___mq_timedreceive, mq_timedreceive, GLIBC_2_34);
libc_hidden_ver (___mq_timedreceive, __mq_timedreceive)
# ifndef SHARED
strong_alias (___mq_timedreceive, __mq_timedreceive)
# endif
# if OTHER_SHLIB_COMPAT (librt, GLIBC_2_3_4, GLIBC_2_34)
compat_symbol (librt, ___mq_timedreceive, mq_timedreceive, GLIBC_2_3_4);
# endif

#endif /* __TIMESIZE != 64 */