sysdeps/unix/sysv/linux/mq_timedreceive.c

   1 /* Receive a message from a message queue with a timeout.  Linux version.
   2    Copyright (C) 2017-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <mqueue.h>
  20 #include <sysdep-cancel.h>
  21 #include <shlib-compat.h>
  22
  23 /* Receive the oldest from highest priority messages in message queue
  24    MQDES, stop waiting if ABS_TIMEOUT expires.  */
  25 ssize_t
  26 ___mq_timedreceive_time64 (mqd_t mqdes, char *__restrict msg_ptr, size_t msg_len,
  27                           unsigned int *__restrict msg_prio,
  28                           const struct __timespec64 *__restrict abs_timeout)
  29 {
  30 #ifndef __NR_mq_timedreceive_time64
  31 # define __NR_mq_timedreceive_time64 __NR_mq_timedreceive
  32 #endif
  33
  34 #ifdef __ASSUME_TIME64_SYSCALLS
  35   return SYSCALL_CANCEL (mq_timedreceive_time64, mqdes, msg_ptr, msg_len,
  36                          msg_prio, abs_timeout);
  37 #else
  38   bool need_time64 = abs_timeout != NULL
  39                      && !in_int32_t_range (abs_timeout->tv_sec);
  40   if (need_time64)
  41     {
  42       int r = SYSCALL_CANCEL (mq_timedreceive_time64, mqdes, msg_ptr, msg_len,
  43                               msg_prio, abs_timeout);
  44       if (r >= 0 || errno != ENOSYS)
  45         return r;
  46       __set_errno (EOVERFLOW);
  47       return -1;
  48     }
  49
  50   struct timespec ts32, *pts32 = NULL;
  51   if (abs_timeout != NULL)
  52     {
  53       ts32 = valid_timespec64_to_timespec (*abs_timeout);
  54       pts32 = &ts32;
  55     }
  56
  57   return SYSCALL_CANCEL (mq_timedreceive, mqdes, msg_ptr, msg_len, msg_prio,
  58                          pts32);
  59 #endif
  60 }
  61
  62 #if __TIMESIZE == 64
  63 versioned_symbol (libc, ___mq_timedreceive_time64, mq_timedreceive, GLIBC_2_34);
  64 libc_hidden_ver (___mq_timedreceive_time64, __mq_timedreceive)
  65 # ifndef SHARED
  66 strong_alias (___mq_timedreceive_time64, __mq_timedreceive)
  67 # endif
  68 # if OTHER_SHLIB_COMPAT (librt, GLIBC_2_3_4, GLIBC_2_34)
  69 compat_symbol (librt, ___mq_timedreceive_time64, mq_timedreceive, GLIBC_2_3_4);
  70 # endif
  71
  72 #else /* __TIMESIZE != 64 */
  73 libc_hidden_ver (___mq_timedreceive_time64, __mq_timedreceive_time64)
  74 versioned_symbol (libc, ___mq_timedreceive_time64, __mq_timedreceive_time64,
  75                   GLIBC_2_34);
  76
  77 ssize_t
  78 ___mq_timedreceive (mqd_t mqdes, char *__restrict msg_ptr, size_t msg_len,
  79                     unsigned int *__restrict msg_prio,
  80                     const struct timespec *__restrict abs_timeout)
  81 {
  82   struct __timespec64 ts64;
  83   if (abs_timeout != NULL)
  84     ts64 = valid_timespec_to_timespec64 (*abs_timeout);
  85
  86   return __mq_timedreceive_time64 (mqdes, msg_ptr, msg_len, msg_prio,
  87                                    abs_timeout != NULL ? &ts64 : NULL);
  88 }
  89 versioned_symbol (libc, ___mq_timedreceive, mq_timedreceive, GLIBC_2_34);
  90 libc_hidden_ver (___mq_timedreceive, __mq_timedreceive)
  91 # ifndef SHARED
  92 strong_alias (___mq_timedreceive, __mq_timedreceive)
  93 # endif
  94 # if OTHER_SHLIB_COMPAT (librt, GLIBC_2_3_4, GLIBC_2_34)
  95 compat_symbol (librt, ___mq_timedreceive, mq_timedreceive, GLIBC_2_3_4);
  96 # endif
  97
  98 #endif /* __TIMESIZE != 64 */