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71d87d85bf
On success, mq_receive() and mq_timedreceive() return the number of bytes in the received message, so it requires to check if the value is larger than 0. Checked on i686-linux-gnu.
99 lines
3.4 KiB
C
99 lines
3.4 KiB
C
/* Receive a message from a message queue with a timeout. Linux version.
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Copyright (C) 2017-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <mqueue.h>
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#include <sysdep-cancel.h>
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#include <shlib-compat.h>
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/* Receive the oldest from highest priority messages in message queue
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MQDES, stop waiting if ABS_TIMEOUT expires. */
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ssize_t
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___mq_timedreceive_time64 (mqd_t mqdes, char *__restrict msg_ptr, size_t msg_len,
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unsigned int *__restrict msg_prio,
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const struct __timespec64 *__restrict abs_timeout)
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{
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#ifndef __NR_mq_timedreceive_time64
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# define __NR_mq_timedreceive_time64 __NR_mq_timedreceive
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#endif
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#ifdef __ASSUME_TIME64_SYSCALLS
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return SYSCALL_CANCEL (mq_timedreceive_time64, mqdes, msg_ptr, msg_len,
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msg_prio, abs_timeout);
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#else
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bool need_time64 = abs_timeout != NULL
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&& !in_time_t_range (abs_timeout->tv_sec);
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if (need_time64)
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{
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int r = SYSCALL_CANCEL (mq_timedreceive_time64, mqdes, msg_ptr, msg_len,
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msg_prio, abs_timeout);
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if (r >= 0 || errno != ENOSYS)
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return r;
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__set_errno (EOVERFLOW);
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return -1;
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}
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struct timespec ts32, *pts32 = NULL;
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if (abs_timeout != NULL)
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{
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ts32 = valid_timespec64_to_timespec (*abs_timeout);
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pts32 = &ts32;
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}
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return SYSCALL_CANCEL (mq_timedreceive, mqdes, msg_ptr, msg_len, msg_prio,
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pts32);
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#endif
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}
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#if __TIMESIZE == 64
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versioned_symbol (libc, ___mq_timedreceive_time64, mq_timedreceive, GLIBC_2_34);
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libc_hidden_ver (___mq_timedreceive_time64, __mq_timedreceive)
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# ifndef SHARED
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strong_alias (___mq_timedreceive_time64, __mq_timedreceive)
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# endif
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# if OTHER_SHLIB_COMPAT (librt, GLIBC_2_3_4, GLIBC_2_34)
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compat_symbol (librt, ___mq_timedreceive_time64, mq_timedreceive, GLIBC_2_3_4);
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# endif
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#else /* __TIMESIZE != 64 */
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libc_hidden_ver (___mq_timedreceive_time64, __mq_timedreceive_time64)
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versioned_symbol (libc, ___mq_timedreceive_time64, __mq_timedreceive_time64,
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GLIBC_2_34);
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ssize_t
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___mq_timedreceive (mqd_t mqdes, char *__restrict msg_ptr, size_t msg_len,
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unsigned int *__restrict msg_prio,
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const struct timespec *__restrict abs_timeout)
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{
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struct __timespec64 ts64;
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if (abs_timeout != NULL)
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ts64 = valid_timespec_to_timespec64 (*abs_timeout);
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return __mq_timedreceive_time64 (mqdes, msg_ptr, msg_len, msg_prio,
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abs_timeout != NULL ? &ts64 : NULL);
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}
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versioned_symbol (libc, ___mq_timedreceive, mq_timedreceive, GLIBC_2_34);
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libc_hidden_ver (___mq_timedreceive, __mq_timedreceive)
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# ifndef SHARED
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strong_alias (___mq_timedreceive, __mq_timedreceive)
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# endif
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# if OTHER_SHLIB_COMPAT (librt, GLIBC_2_3_4, GLIBC_2_34)
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compat_symbol (librt, ___mq_timedreceive, mq_timedreceive, GLIBC_2_3_4);
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# endif
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#endif /* __TIMESIZE != 64 */
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