setjmp/setjmp.h

   1 /* Copyright (C) 1991,92,93,94,95,96,97,98,99 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 /*
  20  *      ISO C Standard: 4.6 NON-LOCAL JUMPS     <setjmp.h>
  21  */
  22
  23 #ifndef _SETJMP_H
  24 #define _SETJMP_H       1
  25
  26 #include <features.h>
  27
  28 __BEGIN_DECLS
  29
  30 #include <bits/setjmp.h>                /* Get `__jmp_buf'.  */
  31 #include <bits/sigset.h>                /* Get `__sigset_t'.  */
  32
  33 /* Calling environment, plus possibly a saved signal mask.  */
  34 typedef struct __jmp_buf_tag    /* C++ doesn't like tagless structs.  */
  35   {
  36     /* NOTE: The machine-dependent definitions of `__sigsetjmp'
  37        assume that a `jmp_buf' begins with a `__jmp_buf'.
  38        Do not move this member or add others before it.  */
  39     __jmp_buf __jmpbuf;         /* Calling environment.  */
  40     int __mask_was_saved;       /* Saved the signal mask?  */
  41     __sigset_t __saved_mask;    /* Saved signal mask.  */
  42   } jmp_buf[1];
  43
  44
  45 /* Store the calling environment in ENV, also saving the
  46    signal mask if SAVEMASK is nonzero.  Return 0.
  47    This is the internal name for `sigsetjmp'.  */
  48 extern int __sigsetjmp (jmp_buf __env, int __savemask) __THROW;
  49
  50 #ifndef __FAVOR_BSD
  51 /* Set ENV to the current position and return 0, not saving the signal mask.
  52    This is just like `sigsetjmp (ENV, 0)'.
  53    The ISO C standard says `setjmp' is a macro.  */
  54 # define setjmp(env)    __sigsetjmp ((env), 0)
  55 #else
  56 /* We are in 4.3 BSD-compatibility mode in which `setjmp'
  57    saves the signal mask like `sigsetjmp (ENV, 1)'.  */
  58 # define setjmp(env)    __sigsetjmp ((env), 1)
  59 #endif /* Favor BSD.  */
  60
  61 #if defined __USE_BSD || defined __USE_XOPEN
  62 /* Set ENV to the current position and return 0, not saving the signal mask.
  63    This is the 4.3 BSD name for ISO `setjmp'.  */
  64 # define _setjmp(env)   __sigsetjmp ((env), 0)
  65 #endif
  66
  67
  68 /* Jump to the environment saved in ENV, making the
  69    `setjmp' call there return VAL, or 1 if VAL is 0.  */
  70 extern void longjmp (jmp_buf __env, int __val)
  71      __THROW __attribute__ ((__noreturn__));
  72 #if defined __USE_BSD || defined __USE_XOPEN
  73 /* Same.  Usually `_longjmp' is used with `_setjmp', which does not save
  74    the signal mask.  But it is how ENV was saved that determines whether
  75    `longjmp' restores the mask; `_longjmp' is just an alias.  */
  76 extern void _longjmp (jmp_buf __env, int __val)
  77      __THROW __attribute__ ((__noreturn__));
  78 #endif
  79
  80
  81 #ifdef  __USE_POSIX
  82 /* Use the same type for `jmp_buf' and `sigjmp_buf'.
  83    The `__mask_was_saved' flag determines whether
  84    or not `longjmp' will restore the signal mask.  */
  85 typedef jmp_buf sigjmp_buf;
  86
  87 /* Store the calling environment in ENV, also saving the
  88    signal mask if SAVEMASK is nonzero.  Return 0.  */
  89 # define sigsetjmp(env, savemask)       __sigsetjmp ((env), (savemask))
  90
  91 /* Jump to the environment saved in ENV, making the
  92    sigsetjmp call there return VAL, or 1 if VAL is 0.
  93    Restore the signal mask if that sigsetjmp call saved it.
  94    This is just an alias `longjmp'.  */
  95 extern void siglongjmp (sigjmp_buf __env, int __val)
  96      __THROW __attribute__ ((__noreturn__));
  97 #endif /* Use POSIX.  */
  98
  99 __END_DECLS
 100
 101 #endif /* setjmp.h  */