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97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/* Copyright (C) 2008-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2008.
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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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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <signal.h>
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#include <sys/socket.h>
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#include <sysdep-cancel.h>
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#include <sys/syscall.h>
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#include <kernel-features.h>
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/* Do not use the accept4 syscall on socketcall architectures unless
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it was added at the same time as the socketcall support or can be
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assumed to be present. */
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#if defined __ASSUME_SOCKETCALL \
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&& !defined __ASSUME_ACCEPT4_SYSCALL_WITH_SOCKETCALL \
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&& !defined __ASSUME_ACCEPT4_SYSCALL
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# undef __NR_accept4
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#endif
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#ifdef __NR_accept4
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int
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accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
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{
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return SYSCALL_CANCEL (accept4, fd, addr.__sockaddr__, addr_len, flags);
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}
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#elif defined __NR_socketcall
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# include <socketcall.h>
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# ifdef __ASSUME_ACCEPT4_SOCKETCALL
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int
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accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
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{
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return SOCKETCALL_CANCEL (accept4, fd, addr.__sockaddr__, addr_len, flags);
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}
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# else
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static int have_accept4;
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int
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accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
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{
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if (__glibc_likely (have_accept4 >= 0))
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{
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int ret = SOCKETCALL_CANCEL (accept4, fd, addr.__sockaddr__, addr_len,
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flags);
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/* The kernel returns -EINVAL for unknown socket operations.
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We need to convert that error to an ENOSYS error. */
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if (__builtin_expect (ret < 0, 0)
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&& have_accept4 == 0
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&& errno == EINVAL)
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{
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/* Try another call, this time with the FLAGS parameter
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cleared and an invalid file descriptor. This call will not
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cause any harm and it will return immediately. */
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ret = SOCKETCALL_CANCEL (invalid, -1);
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if (errno == EINVAL)
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{
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have_accept4 = -1;
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__set_errno (ENOSYS);
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}
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else
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{
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have_accept4 = 1;
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__set_errno (EINVAL);
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}
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return -1;
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}
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return ret;
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}
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__set_errno (ENOSYS);
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return -1;
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}
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# endif /* __ASSUME_ACCEPT4_SOCKETCALL */
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#else /* __NR_socketcall */
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int
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accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
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{
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__set_errno (ENOSYS);
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return -1;
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}
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stub_warning (accept4)
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#endif
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