1 /* Linux recvmsg syscall wrapper.
2 Copyright (C) 2016-2021 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 <sys/socket.h>
20 #include <sysdep-cancel.h>
21 #include <socketcall.h>
22
23 ssize_t
__libc_recvmsg(int fd,struct msghdr * msg,int flags)24 __libc_recvmsg (int fd, struct msghdr *msg, int flags)
25 {
26 ssize_t r;
27 #ifndef __ASSUME_TIME64_SYSCALLS
28 socklen_t orig_controllen = msg != NULL ? msg->msg_controllen : 0;
29 #endif
30
31 #ifdef __ASSUME_RECVMSG_SYSCALL
32 r = SYSCALL_CANCEL (recvmsg, fd, msg, flags);
33 #else
34 r = SOCKETCALL_CANCEL (recvmsg, fd, msg, flags);
35 #endif
36
37 #ifndef __ASSUME_TIME64_SYSCALLS
38 if (r >= 0 && orig_controllen != 0)
39 __convert_scm_timestamps (msg, orig_controllen);
40 #endif
41
42 return r;
43 }
44 weak_alias (__libc_recvmsg, recvmsg)
45 weak_alias (__libc_recvmsg, __recvmsg)
46 #if __TIMESIZE != 64
47 weak_alias (__recvmsg, __recvmsg64)
48 #endif
49