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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2011 New Dream Network
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_SAFE_IO
#define CEPH_SAFE_IO
#include "common/compiler_extensions.h"
#include <sys/types.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* Safe functions wrapping the raw read() and write() libc functions.
* These retry on EINTR, and on error return -errno instead of returning
* -1 and setting errno).
*/
ssize_t safe_read(int fd, void *buf, size_t count)
WARN_UNUSED_RESULT;
ssize_t safe_write(int fd, const void *buf, size_t count)
WARN_UNUSED_RESULT;
ssize_t safe_pread(int fd, void *buf, size_t count, off_t offset)
WARN_UNUSED_RESULT;
ssize_t safe_pwrite(int fd, const void *buf, size_t count, off_t offset)
WARN_UNUSED_RESULT;
#ifdef CEPH_HAVE_SPLICE
/*
* Similar to the above (non-exact version) and below (exact version).
* See splice(2) for parameter descriptions.
*/
ssize_t safe_splice(int fd_in, off_t *off_in, int fd_out, off_t *off_out,
size_t len, unsigned int flags)
WARN_UNUSED_RESULT;
ssize_t safe_splice_exact(int fd_in, off_t *off_in, int fd_out,
off_t *off_out, size_t len, unsigned int flags)
WARN_UNUSED_RESULT;
#endif
/*
* Same as the above functions, but return -EDOM unless exactly the requested
* number of bytes can be read.
*/
ssize_t safe_read_exact(int fd, void *buf, size_t count)
WARN_UNUSED_RESULT;
ssize_t safe_pread_exact(int fd, void *buf, size_t count, off_t offset)
WARN_UNUSED_RESULT;
/*
* Safe functions to read and write an entire file.
*/
int safe_write_file(const char *base, const char *file,
const char *val, size_t vallen,
unsigned mode);
int safe_read_file(const char *base, const char *file,
char *val, size_t vallen);
#ifdef __cplusplus
}
#endif
#endif
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