9a45f54310
Now we can assume a kernel with recvmmsg 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. (In fact further simplification is possible, getting rid of the __ASSUME_*_SYSCALL_WITH_SOCKETCALL macros now that the minimum kernel is guaranteed support for all of accept4, recvmmsg, sendmmsg, whether through syscalls or through socketcall. I intend to do that for all of accept4 / recvmmsg / sendmmsg together - so making their implementations just like those for older socket functions - once the basic cleanup for 3.2 minimum kernel is done for sendmmsg as well as recvmmsg.) Tested for x86_64 and x86. * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_RECVMMSG_SYSCALL): Define unconditionally. (__ASSUME_RECVMMSG_SOCKETCALL): Remove macro. (__ASSUME_RECVMMSG): Likewise. * sysdeps/unix/sysv/linux/recvmmsg.c (recvmmsg): Define using recvmmsg syscall if it can be assumed to be present, socketcall otherwise, with no fallback for runtime failure.
42 lines
1.5 KiB
C
42 lines
1.5 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 <socketcall.h>
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#include <kernel-features.h>
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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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/* 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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return SOCKETCALL_CANCEL (recvmmsg, fd, vmessages, vlen, flags, tmo);
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#else
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return SYSCALL_CANCEL (recvmmsg, fd, vmessages, vlen, flags, tmo);
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#endif
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}
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