src/system.h

/*
 * Copyright (c) 2004
 *	Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <limits.h>
#include <signal.h>
#include <sys/types.h>

#ifndef SSIZE_MAX
#define SSIZE_MAX ((ssize_t)((size_t)-1 >> 1))
#endif

static inline void sigclearmask(void)
{
#ifdef HAVE_SIGSETMASK
	sigsetmask(0);
#else
	sigset_t set;
	sigemptyset(&set);
	sigprocmask(SIG_SETMASK, &set, 0);
#endif
}

#ifndef HAVE_MEMPCPY
void *mempcpy(void *, const void *, size_t);
#endif

#ifndef HAVE_STPCPY
char *stpcpy(char *, const char *);
#endif

#ifndef HAVE_STRCHRNUL
char *strchrnul(const char *, int);
#endif

#ifndef HAVE_STRSIGNAL
char *strsignal(int);
#endif

#ifndef HAVE_STRTOD
static inline double strtod(const char *nptr, char **endptr)
{
	*endptr = (char *)nptr;
	return 0;
}
#endif

#ifndef HAVE_STRTOIMAX
#define strtoimax strtoll
#endif

#ifndef HAVE_STRTOUMAX
#define strtoumax strtoull
#endif

#ifndef HAVE_BSEARCH
void *bsearch(const void *, const void *, size_t, size_t,
	      int (*)(const void *, const void *));
#endif

#ifndef HAVE_KILLPG
static inline int killpg(pid_t pid, int signal)
{
#ifdef DEBUG
	if (pid < 0)
		abort();
#endif
	return kill(-pid, signal);
}
#endif

#ifndef HAVE_SYSCONF
#define _SC_CLK_TCK 2
long sysconf(int) __attribute__((__noreturn__));
#endif

#if !HAVE_DECL_ISBLANK
int isblank(int c);
#endif

/*
 * A trick to suppress uninitialized variable warning without generating any
 * code
 */
#define uninitialized_var(x) x = x