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https://github.com/freebsd/freebsd-src
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57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
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/*
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* Copyright (c) 1995,1999 Theo de Raadt. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <errno.h>
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#include <unistd.h>
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ssize_t atomicio(ssize_t (*f)(int, void *, size_t), int fd, void *_s, size_t n);
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/*
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* ensure all of data on socket comes through. f==read || f==write
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*/
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ssize_t
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atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
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{
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char *s = _s;
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ssize_t res, pos = 0;
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while (n > pos) {
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res = (f) (fd, s + pos, n - pos);
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switch (res) {
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case -1:
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if (errno == EINTR || errno == EAGAIN)
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continue;
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case 0:
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return (res);
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default:
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pos += res;
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}
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}
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return (pos);
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}
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