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94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/* Copyright (C) 2010-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Schwab <schwab@redhat.com>, 2010.
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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 <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 recvmmsg 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_RECVMMSG_SYSCALL_WITH_SOCKETCALL \
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&& !defined __ASSUME_RECVMMSG_SYSCALL
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# undef __NR_recvmmsg
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#endif
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#ifdef __NR_recvmmsg
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int
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recvmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags,
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struct timespec *tmo)
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{
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return SYSCALL_CANCEL (recvmmsg, fd, vmessages, vlen, flags, tmo);
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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_RECVMMSG_SOCKETCALL
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int
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recvmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags,
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struct timespec *tmo)
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{
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return SOCKETCALL_CANCEL (recvmmsg, fd, vmessages, vlen, flags, tmo);
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}
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# else
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static int have_recvmmsg;
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int
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recvmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags,
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struct timespec *tmo)
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{
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if (__glibc_likely (have_recvmmsg >= 0))
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{
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int ret = SOCKETCALL_CANCEL (recvmmsg, fd, vmessages, vlen, flags,
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tmo);
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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_recvmmsg == 0
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&& errno == EINVAL)
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{
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/* Try another call, this time with an invalid file
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descriptor and all other parameters cleared. This call
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will not cause any harm and it will return
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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_recvmmsg = -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_recvmmsg = 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_RECVMMSG_SOCKETCALL */
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#else
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# include <socket/recvmmsg.c>
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#endif
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