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helpers: add helpers to automatically close fds
Add a inline helper function and a helper macro to be able to automatically close file descriptors. Does nothing if the argument is NULL or the pointed to integer is < 0.
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daemon/helpers.c
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41
daemon/helpers.c
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/*
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Copyright (c) 2017-2019, Feral Interactive
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Copyright (c) 2019, Red Hat
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All rights reserved.
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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 are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* 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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* Neither the name of Feral Interactive nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#define _GNU_SOURCE
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#include "helpers.h"
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/* Starting with C99 we can use "inline" without "static" and thus avoid
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* having multiple (local) definitions of the same inline function. One
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* consequence of that is that if the compiler decides to *not* inline
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* a specific call to the function the linker will expect an definition.
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*/
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extern inline void cleanup_close(int *fd);
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@ -34,6 +34,7 @@ POSSIBILITY OF SUCH DAMAGE.
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#include <stdio.h>
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#include <string.h>
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#include <sys/param.h>
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#include <unistd.h>
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/**
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* Value clamping helper, works like MIN/MAX but constraints a value within the range.
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@ -62,3 +63,21 @@ static inline const char *strtail(const char *haystack, const char *needle)
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return pos;
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return NULL;
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}
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/**
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* Helper function for autoclosing file-descriptors. Does nothing if the argument
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* is NULL or the referenced integer < 0.
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*/
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inline void cleanup_close(int *fd_ptr)
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{
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if (fd_ptr == NULL || *fd_ptr < 0)
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return;
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(void)close(*fd_ptr);
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}
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/**
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* Helper macro for autoclosing file-descriptors: use by prefixing the variable,
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* like "autoclose_fd int fd = -1;".
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*/
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#define autoclose_fd __attribute__((cleanup(cleanup_close)))
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@ -30,6 +30,7 @@ daemon_sources = [
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'daemonize.c',
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'dbus_messaging.c',
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'daemon_config.c',
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'helpers.c',
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]
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gamemoded_includes = libgamemode_includes
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