src/system.h

   1 /*
   2  * Copyright (c) 2004
   3  *      Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <limits.h>
  30 #include <signal.h>
  31 #include <sys/types.h>
  32
  33 #ifndef SSIZE_MAX
  34 #define SSIZE_MAX ((ssize_t)((size_t)-1 >> 1))
  35 #endif
  36
  37 static inline void sigclearmask(void)
  38 {
  39 #if defined(HAVE_SIGSETMASK) && \
  40     (!defined(__GLIBC__) || \
  41      (defined(__GNUC__) && (__GNUC__ * 1000 + __GNUC_MINOR__) >= 4006))
  42 #ifdef __GLIBC__
  43 #pragma GCC diagnostic push
  44 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
  45 #endif
  46         sigsetmask(0);
  47 #ifdef __GLIBC__
  48 #pragma GCC diagnostic pop
  49 #endif
  50 #else
  51         sigset_t set;
  52         sigemptyset(&set);
  53         sigprocmask(SIG_SETMASK, &set, 0);
  54 #endif
  55 }
  56
  57 #ifndef HAVE_MEMFD_CREATE
  58 static inline int memfd_create(const char *name, unsigned int flags)
  59 {
  60         return -1;
  61 }
  62 #endif
  63
  64 #ifndef HAVE_MEMPCPY
  65 void *mempcpy(void *, const void *, size_t);
  66 #endif
  67
  68 #ifndef HAVE_STPCPY
  69 char *stpcpy(char *, const char *);
  70 #endif
  71
  72 #ifndef HAVE_STRCHRNUL
  73 char *strchrnul(const char *, int);
  74 #endif
  75
  76 #ifndef HAVE_STRSIGNAL
  77 char *strsignal(int);
  78 #endif
  79
  80 #ifndef HAVE_STRTOD
  81 static inline double strtod(const char *nptr, char **endptr)
  82 {
  83         *endptr = (char *)nptr;
  84         return 0;
  85 }
  86 #endif
  87
  88 #ifndef HAVE_STRTOIMAX
  89 #define strtoimax strtoll
  90 #endif
  91
  92 #ifndef HAVE_STRTOUMAX
  93 #define strtoumax strtoull
  94 #endif
  95
  96 #ifndef HAVE_BSEARCH
  97 void *bsearch(const void *, const void *, size_t, size_t,
  98               int (*)(const void *, const void *));
  99 #endif
 100
 101 #ifndef HAVE_KILLPG
 102 static inline int killpg(pid_t pid, int signal)
 103 {
 104 #ifdef DEBUG
 105         if (pid < 0)
 106                 abort();
 107 #endif
 108         return kill(-pid, signal);
 109 }
 110 #endif
 111
 112 #ifndef HAVE_SYSCONF
 113 #define _SC_CLK_TCK 2
 114 long sysconf(int) __attribute__((__noreturn__));
 115 #endif
 116
 117 #if !HAVE_DECL_ISBLANK
 118 int isblank(int c);
 119 #endif
 120
 121 /*
 122  * A trick to suppress uninitialized variable warning without generating any
 123  * code
 124  */
 125 #define uninitialized_var(x) x = x