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[thirdparty/systemd.git] / src / basic / fd-util.h

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

#pragma once

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <dirent.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/socket.h>

#include "macro.h"

/* Make sure we can distinguish fd 0 and NULL */
#define FD_TO_PTR(fd) INT_TO_PTR((fd)+1)
#define PTR_TO_FD(p) (PTR_TO_INT(p)-1)

int close_nointr(int fd);
int safe_close(int fd);
void safe_close_pair(int p[]);

void close_many(const int fds[], unsigned n_fd);

int fclose_nointr(FILE *f);
FILE* safe_fclose(FILE *f);
DIR* safe_closedir(DIR *f);

static inline void closep(int *fd) {
        safe_close(*fd);
}

static inline void close_pairp(int (*p)[2]) {
        safe_close_pair(*p);
}

static inline void fclosep(FILE **f) {
        safe_fclose(*f);
}

DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, pclose);
DEFINE_TRIVIAL_CLEANUP_FUNC(DIR*, closedir);

#define _cleanup_close_ _cleanup_(closep)
#define _cleanup_fclose_ _cleanup_(fclosep)
#define _cleanup_pclose_ _cleanup_(pclosep)
#define _cleanup_closedir_ _cleanup_(closedirp)
#define _cleanup_close_pair_ _cleanup_(close_pairp)

int fd_nonblock(int fd, bool nonblock);
int fd_cloexec(int fd, bool cloexec);

int close_all_fds(const int except[], unsigned n_except);

int same_fd(int a, int b);

void cmsg_close_all(struct msghdr *mh);

bool fdname_is_valid(const char *s);