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0cb5da5c09
Now we can assume a kernel with sendmmsg support, this patch simplifies the implementation to be similar to that for accept4: either using socketcall or the syscall according to whether the syscall is known to be available, without further fallback implementations. The __ASSUME_SENDMMSG macro is kept (now defined unconditionally), since it's used in resolv/res_send.c. Tested for x86_64 and x86. * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_SENDMMSG_SYSCALL): Define unconditionally. (__ASSUME_SENDMMSG): Likewise. (__ASSUME_SENDMMSG_SOCKETCALL): Remove macro. * sysdeps/unix/sysv/linux/sendmmsg.c (__sendmmsg): Define using sendmmsg syscall if that can be assumed to be present, socketcall otherwise, with no fallback for runtime failure.
43 lines
1.6 KiB
C
43 lines
1.6 KiB
C
/* Copyright (C) 2011-2017 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@gmail.com>, 2011.
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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 <socketcall.h>
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#include <kernel-features.h>
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int
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__sendmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags)
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{
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/* Do not use the sendmmsg 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_SENDMMSG_SYSCALL_WITH_SOCKETCALL \
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&& !defined __ASSUME_SENDMMSG_SYSCALL
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return SOCKETCALL_CANCEL (sendmmsg, fd, vmessages, vlen, flags);
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#else
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return SYSCALL_CANCEL (sendmmsg, fd, vmessages, vlen, flags);
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#endif
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}
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libc_hidden_def (__sendmmsg)
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weak_alias (__sendmmsg, sendmmsg)
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