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/*
* Copyright (c) 2008-2018 Cisco Systems, Inc. All rights reserved
* Copyright (c) 2009 Sandia National Laboratories. All rights reserved.
* Copyright (c) 2017 Mellanox Technologies. All rights reserved.
*
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
/* @file */
#ifndef OPAL_UTIL_FD_H_
#define OPAL_UTIL_FD_H_
#include "opal_config.h"
BEGIN_C_DECLS
/**
* Read a complete buffer from a file descriptor.
*
* @param fd File descriptor
* @param len Number of bytes to read
* @param buffer Pre-allocated buffer (large enough to hold len bytes)
*
* @returns OPAL_SUCCESS upon success.
* @returns OPAL_ERR_TIMEOUT if the fd closes before reading the full amount.
* @returns OPAL_ERR_IN_ERRNO otherwise.
*
* Loop over reading from the fd until len bytes are read or an error
* occurs. EAGAIN and EINTR are transparently handled.
*/
OPAL_DECLSPEC int opal_fd_read(int fd, int len, void *buffer);
/**
* Write a complete buffer to a file descriptor.
*
* @param fd File descriptor
* @param len Number of bytes to write
* @param buffer Buffer to write from
*
* @returns OPAL_SUCCESS upon success.
* @returns OPAL_ERR_IN_ERRNO otherwise.
*
* Loop over writing to the fd until len bytes are written or an error
* occurs. EAGAIN and EINTR are transparently handled.
*/
OPAL_DECLSPEC int opal_fd_write(int fd, int len, const void *buffer);
/**
* Convenience function to set a file descriptor to be close-on-exec.
*
* @param fd File descriptor
*
* @returns OPAL_SUCCESS upon success (or if the system does not
* support close-on-exec behavior).
* @returns OPAL_ERR_IN_ERRNO otherwise.
*
* This is simply a convenience function because there's a few steps
* to setting a file descriptor to be close-on-exec.
*/
OPAL_DECLSPEC int opal_fd_set_cloexec(int fd);
/**
* Convenience function to check if fd point to an accessible regular file.
*
* @param fd File descriptor
*
* @returns true if "fd" points to a regular file.
* @returns false otherwise.
*/
OPAL_DECLSPEC bool opal_fd_is_regular(int fd);
/**
* Convenience function to check if fd point to an accessible character device.
*
* @param fd File descriptor
*
* @returns true if "fd" points to a regular file.
* @returns false otherwise.
*/
OPAL_DECLSPEC bool opal_fd_is_chardev(int fd);
/**
* Convenience function to check if fd point to an accessible block device.
*
* @param fd File descriptor
*
* @returns true if "fd" points to a regular file.
* @returns false otherwise.
*/
OPAL_DECLSPEC bool opal_fd_is_blkdev(int fd);
/**
* Convenience function to get a string name of the peer on the other
* end of this internet socket.
*
* @param fd File descriptor of an AF_INET/AF_INET6 socket
*
* @returns resolvable IP name, or "a.b.c.d". This string must be freed by the caller.
*/
OPAL_DECLSPEC const char *opal_fd_get_peer_name(int fd);
END_C_DECLS
#endif
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