1 /* Copyright (C) 2008-2017 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2008.
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.
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.
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 <http://www.gnu.org/licenses/>. */
21 #include <sys/socket.h>
23 #include <sysdep-cancel.h>
24 #include <sys/syscall.h>
25 #include <kernel-features.h>
27 /* Do not use the accept4 syscall on socketcall architectures unless
28 it was added at the same time as the socketcall support or can be
29 assumed to be present. */
30 #if defined __ASSUME_SOCKETCALL \
31 && !defined __ASSUME_ACCEPT4_SYSCALL_WITH_SOCKETCALL \
32 && !defined __ASSUME_ACCEPT4_SYSCALL
38 accept4 (int fd
, __SOCKADDR_ARG addr
, socklen_t
*addr_len
, int flags
)
40 return SYSCALL_CANCEL (accept4
, fd
, addr
.__sockaddr__
, addr_len
, flags
);
42 #elif defined __NR_socketcall
43 # include <socketcall.h>
44 # ifdef __ASSUME_ACCEPT4_SOCKETCALL
46 accept4 (int fd
, __SOCKADDR_ARG addr
, socklen_t
*addr_len
, int flags
)
48 return SOCKETCALL_CANCEL (accept4
, fd
, addr
.__sockaddr__
, addr_len
, flags
);
51 static int have_accept4
;
54 accept4 (int fd
, __SOCKADDR_ARG addr
, socklen_t
*addr_len
, int flags
)
56 if (__glibc_likely (have_accept4
>= 0))
58 int ret
= SOCKETCALL_CANCEL (accept4
, fd
, addr
.__sockaddr__
, addr_len
,
60 /* The kernel returns -EINVAL for unknown socket operations.
61 We need to convert that error to an ENOSYS error. */
62 if (__builtin_expect (ret
< 0, 0)
66 /* Try another call, this time with the FLAGS parameter
67 cleared and an invalid file descriptor. This call will not
68 cause any harm and it will return immediately. */
69 ret
= SOCKETCALL_CANCEL (invalid
, -1);
87 # endif /* __ASSUME_ACCEPT4_SOCKETCALL */
88 #else /* __NR_socketcall */
90 accept4 (int fd
, __SOCKADDR_ARG addr
, socklen_t
*addr_len
, int flags
)
95 stub_warning (accept4
)