1 /* Receive a message from a message queue with a timeout.  Linux version.
2    Copyright (C) 2017-2021 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
___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)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_time_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
___mq_timedreceive(mqd_t mqdes,char * __restrict msg_ptr,size_t msg_len,unsigned int * __restrict msg_prio,const struct timespec * __restrict abs_timeout)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 */
99