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/*
* Copyright (C) 2008-2017 Tobias Brunner
* Copyright (C) 2008 Martin Willi
* HSR Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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 General Public License
* for more details.
*/
/**
* @defgroup utils_i utils
* @{ @ingroup utils
*/
#ifndef UTILS_H_
#define UTILS_H_
#define _GNU_SOURCE
#include <sys/types.h>
#include <stdlib.h>
#include <stddef.h>
#include <sys/time.h>
#include <string.h>
#include <stdarg.h>
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef WIN32
# include "compat/windows.h"
#else
# include <arpa/inet.h>
# include <sys/socket.h>
# include <netdb.h>
# include <netinet/in.h>
# include <sched.h>
# include <poll.h>
# include <signal.h>
#endif
#include "utils/types.h"
#include "enum.h"
#include "utils/atomics.h"
#include "utils/align.h"
#include "utils/byteorder.h"
#include "utils/string.h"
#include "utils/memory.h"
#include "utils/strerror.h"
#include "utils/status.h"
#include "utils/object.h"
#include "utils/path.h"
#include "utils/time.h"
#include "utils/tty.h"
#ifdef __APPLE__
# include "compat/apple.h"
#endif
#ifdef __ANDROID__
# include "compat/android.h"
#endif
/**
* Initialize utility functions
*/
void utils_init();
/**
* Deinitialize utility functions
*/
void utils_deinit();
/**
* strongSwan program return codes
*/
#define SS_RC_LIBSTRONGSWAN_INTEGRITY 64
#define SS_RC_DAEMON_INTEGRITY 65
#define SS_RC_INITIALIZATION_FAILED 66
#define SS_RC_FIRST SS_RC_LIBSTRONGSWAN_INTEGRITY
#define SS_RC_LAST SS_RC_INITIALIZATION_FAILED
/**
* Number of bits in a byte
*/
#define BITS_PER_BYTE 8
/**
* Default length for various auxiliary text buffers
*/
#define BUF_LEN 512
/**
* Build assertion macro for integer expressions, evaluates to 0
*/
#define BUILD_ASSERT(x) (sizeof(char[(x) ? 0 : -1]))
/**
* Build time check to assert a is an array, evaluates to 0
*
* The address of an array element has a pointer type, which is not compatible
* to the array type.
*/
#define BUILD_ASSERT_ARRAY(a) \
BUILD_ASSERT(!__builtin_types_compatible_p(typeof(a), typeof(&(a)[0])))
/**
* Debug macro to follow control flow
*/
#define POS printf("%s, line %d\n", __FILE__, __LINE__)
/**
* This macro allows counting the number of arguments passed to a macro.
* Combined with the VA_ARGS_DISPATCH() macro this can be used to implement
* macro overloading based on the number of arguments.
* 0 to 10 arguments are currently supported.
*/
#define VA_ARGS_NUM(...) _VA_ARGS_NUM(0,##__VA_ARGS__,10,9,8,7,6,5,4,3,2,1,0)
#define _VA_ARGS_NUM(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,NUM,...) NUM
/**
* This macro can be used to dispatch a macro call based on the number of given
* arguments, for instance:
*
* @code
* #define MY_MACRO(...) VA_ARGS_DISPATCH(MY_MACRO, __VA_ARGS__)(__VA_ARGS__)
* #define MY_MACRO1(arg) one_arg(arg)
* #define MY_MACRO2(arg1,arg2) two_args(arg1,arg2)
* @endcode
*
* MY_MACRO() can now be called with either one or two arguments, which will
* resolve to one_arg(arg) or two_args(arg1,arg2), respectively.
*/
#define VA_ARGS_DISPATCH(func, ...) _VA_ARGS_DISPATCH(func, VA_ARGS_NUM(__VA_ARGS__))
#define _VA_ARGS_DISPATCH(func, num) __VA_ARGS_DISPATCH(func, num)
#define __VA_ARGS_DISPATCH(func, num) func ## num
/**
* Assign variadic arguments to the given variables.
*
* @note The order and types of the variables are significant and must match the
* variadic arguments passed to the function that calls this macro exactly.
*
* @param last the last argument before ... in the function that calls this
* @param ... variable names
*/
#define VA_ARGS_GET(last, ...) ({ \
va_list _va_args_get_ap; \
va_start(_va_args_get_ap, last); \
_VA_ARGS_GET_ASGN(__VA_ARGS__) \
va_end(_va_args_get_ap); \
})
/**
* Assign variadic arguments from a va_list to the given variables.
*
* @note The order and types of the variables are significant and must match the
* variadic arguments passed to the function that calls this macro exactly.
*
* @param list the va_list variable in the function that calls this
* @param ... variable names
*/
#define VA_ARGS_VGET(list, ...) ({ \
va_list _va_args_get_ap; \
va_copy(_va_args_get_ap, list); \
_VA_ARGS_GET_ASGN(__VA_ARGS__) \
va_end(_va_args_get_ap); \
})
#define _VA_ARGS_GET_ASGN(...) VA_ARGS_DISPATCH(_VA_ARGS_GET_ASGN, __VA_ARGS__)(__VA_ARGS__)
#define _VA_ARGS_GET_ASGN1(v1) __VA_ARGS_GET_ASGN(v1)
#define _VA_ARGS_GET_ASGN2(v1,v2) __VA_ARGS_GET_ASGN(v1) __VA_ARGS_GET_ASGN(v2)
#define _VA_ARGS_GET_ASGN3(v1,v2,v3) __VA_ARGS_GET_ASGN(v1) __VA_ARGS_GET_ASGN(v2) \
__VA_ARGS_GET_ASGN(v3)
#define _VA_ARGS_GET_ASGN4(v1,v2,v3,v4) __VA_ARGS_GET_ASGN(v1) __VA_ARGS_GET_ASGN(v2) \
__VA_ARGS_GET_ASGN(v3) __VA_ARGS_GET_ASGN(v4)
#define _VA_ARGS_GET_ASGN5(v1,v2,v3,v4,v5) __VA_ARGS_GET_ASGN(v1) __VA_ARGS_GET_ASGN(v2) \
__VA_ARGS_GET_ASGN(v3) __VA_ARGS_GET_ASGN(v4) __VA_ARGS_GET_ASGN(v5)
#define __VA_ARGS_GET_ASGN(v) v = va_arg(_va_args_get_ap, typeof(v));
/**
* Macro to allocate a sized type.
*/
#define malloc_thing(thing) ((thing*)malloc(sizeof(thing)))
/**
* Get the number of elements in an array
*/
#define countof(array) (sizeof(array)/sizeof((array)[0]) \
+ BUILD_ASSERT_ARRAY(array))
/**
* Ignore result of functions tagged with warn_unused_result attributes
*/
#define ignore_result(call) { if(call){}; }
#if !defined(HAVE_SIGWAITINFO) && !defined(WIN32)
/**
* Block and wait for a set of signals
*
* We don't replicate the functionality of siginfo_t. If info is not NULL
* -1 is returend and errno is set to EINVAL.
*
* @param set set of signals to wait for
* @param info must be NULL
*/
int sigwaitinfo(const sigset_t *set, void *info);
#endif
/**
* Portable function to wait for SIGINT/SIGTERM (or equivalent).
*/
void wait_sigint();
#ifndef HAVE_CLOSEFROM
/**
* Close open file descriptors greater than or equal to lowfd.
*
* @param lowfd start closing file descriptors from here
*/
void closefrom(int lowfd);
#endif
/**
* returns null
*/
void *return_null();
/**
* No-Operation function
*/
void nop();
/**
* returns TRUE
*/
bool return_true();
/**
* returns FALSE
*/
bool return_false();
#endif /** UTILS_H_ @}*/
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