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/*
* Copyright (c) 2008 The Hewlett-Packard Development Company
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Nathan Binkert
*/
#ifndef __BASE_ATOMICIO_HH__
#define __BASE_ATOMICIO_HH__
#include <unistd.h>
// These functions keep reading/writing, if possible, until all data
// has been transferred. Basically, try again when there's no error,
// but there is data left also retry on EINTR.
// This function blocks until it is done.
ssize_t atomic_read(int fd, void *s, size_t n);
ssize_t atomic_write(int fd, const void *s, size_t n);
/**
* Statically allocate a string and write it to a file descriptor.
*
* @warning The return value will from atomic_write will be ignored
* which means that errors will be ignored. This is normally fine as
* this macro is intended to be used in fatal signal handlers where
* error handling might not be feasible.
*/
#define STATIC_MSG(fd, m) \
do { \
static const char msg[] = m; \
atomic_write(fd, msg, sizeof(msg) - 1); \
} while (0)
/**
* Statically allocate a string and write it to STDERR.
*
* @warning The return value will from atomic_write will be ignored
* which means that errors will be ignored. This is normally fine as
* this macro is intended to be used in fatal signal handlers where
* error handling might not be feasible.
*/
#define STATIC_ERR(m) STATIC_MSG(STDERR_FILENO, m)
#endif // __BASE_ATOMICIO_HH__
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