mirror of git://sourceware.org/git/glibc.git
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
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/* Compatibility version of recvmsg.
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Copyright (C) 2010-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 <sys/socket.h>
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#include <sysdep-cancel.h>
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#include <socketcall.h>
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#include <shlib-compat.h>
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#if __WORDSIZE == 64
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# if SHLIB_COMPAT (libc, GLIBC_2_12, GLIBC_2_24)
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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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int
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__old_recvmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen,
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int flags, struct timespec *tmo)
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{
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# ifdef __NR_recvmmsg
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return SYSCALL_CANCEL (recvmmsg, fd, vmessages, vlen, flags, tmo);
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# elif defined __NR_socketcall
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# ifdef __ASSUME_RECVMMSG_SOCKETCALL
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return SOCKETCALL_CANCEL (recvmmsg, fd, vmessages, vlen, flags, tmo);
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# else
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static int have_recvmmsg;
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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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# endif /* __ASSUME_RECVMMSG_SOCKETCALL */
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# else
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__set_errno (ENOSYS);
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return -1;
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# endif
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}
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compat_symbol (libc, __old_recvmmsg, recvmmsg, GLIBC_2_12);
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# endif /* SHLIB_COMPAT (libc, GLIBC_2_12, GLIBC_2_24) */
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#endif /* __WORDSIZE == 64 */
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