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001: /* Copyright (C) 1991-1999,2001,2002,2007,2009,2011 Free Software Foundation, Inc.
002:    This file is part of the GNU C Library.
003: 
004:    The GNU C Library is free software; you can redistribute it and/or
005:    modify it under the terms of the GNU Lesser General Public
006:    License as published by the Free Software Foundation; either
007:    version 2.1 of the License, or (at your option) any later version.
008: 
009:    The GNU C Library is distributed in the hope that it will be useful,
010:    but WITHOUT ANY WARRANTY; without even the implied warranty of
011:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
012:    Lesser General Public License for more details.
013: 
014:    You should have received a copy of the GNU Lesser General Public
015:    License along with the GNU C Library; if not, write to the Free
016:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
017:    02111-1307 USA.  */
018: 
019: /*
020:  *      ISO C99 Standard: 7.13 Nonlocal jumps   <setjmp.h>
021:  */
022: 
023: #ifndef _SETJMP_H
024: #define _SETJMP_H       1
025: 
026: #include <features.h>
027: 
028: __BEGIN_DECLS
029: 
030: #include <bits/setjmp.h>                /* Get `__jmp_buf'.  */
031: #include <bits/sigset.h>                /* Get `__sigset_t'.  */
032: 
033: 
034: /* Calling environment, plus possibly a saved signal mask.  */
035: struct __jmp_buf_tag
036:   {
037:     /* NOTE: The machine-dependent definitions of `__sigsetjmp'
038:        assume that a `jmp_buf' begins with a `__jmp_buf' and that
039:        `__mask_was_saved' follows it.  Do not move these members
040:        or add others before it.  */
041:     __jmp_buf __jmpbuf;         /* Calling environment.  */
042:     int __mask_was_saved;       /* Saved the signal mask?  */
043:     __sigset_t __saved_mask;    /* Saved signal mask.  */
044:   };
045: 
046: 
047: __BEGIN_NAMESPACE_STD
048: 
049: typedef struct __jmp_buf_tag jmp_buf[1];
050: 
051: /* Store the calling environment in ENV, also saving the signal mask.
052:    Return 0.  */
053: extern int setjmp (jmp_buf __env) __THROWNL;
054: 
055: __END_NAMESPACE_STD
056: 
057: /* Store the calling environment in ENV, also saving the
058:    signal mask if SAVEMASK is nonzero.  Return 0.
059:    This is the internal name for `sigsetjmp'.  */
060: extern int __sigsetjmp (struct __jmp_buf_tag __env[1], int __savemask) __THROWNL;
061: 
062: #ifndef __FAVOR_BSD
063: /* Store the calling environment in ENV, not saving the signal mask.
064:    Return 0.  */
065: extern int _setjmp (struct __jmp_buf_tag __env[1]) __THROWNL;
066: 
067: /* Do not save the signal mask.  This is equivalent to the `_setjmp'
068:    BSD function.  */
069: # define setjmp(env)    _setjmp (env)
070: #else
071: /* We are in 4.3 BSD-compatibility mode in which `setjmp'
072:    saves the signal mask like `sigsetjmp (ENV, 1)'.  We have to
073:    define a macro since ISO C says `setjmp' is one.  */
074: # define setjmp(env)    setjmp (env)
075: #endif /* Favor BSD.  */
076: 
077: 
078: __BEGIN_NAMESPACE_STD
079: 
080: /* Jump to the environment saved in ENV, making the
081:    `setjmp' call there return VAL, or 1 if VAL is 0.  */
082: extern void longjmp (struct __jmp_buf_tag __env[1], int __val)
083:      __THROWNL __attribute__ ((__noreturn__));
084: 
085: __END_NAMESPACE_STD
086: 
087: #if defined __USE_BSD || defined __USE_XOPEN
088: /* Same.  Usually `_longjmp' is used with `_setjmp', which does not save
089:    the signal mask.  But it is how ENV was saved that determines whether
090:    `longjmp' restores the mask; `_longjmp' is just an alias.  */
091: extern void _longjmp (struct __jmp_buf_tag __env[1], int __val)
092:      __THROWNL __attribute__ ((__noreturn__));
093: #endif
094: 
095: 
096: #ifdef  __USE_POSIX
097: /* Use the same type for `jmp_buf' and `sigjmp_buf'.
098:    The `__mask_was_saved' flag determines whether
099:    or not `longjmp' will restore the signal mask.  */
100: typedef struct __jmp_buf_tag sigjmp_buf[1];
101: 
102: /* Store the calling environment in ENV, also saving the
103:    signal mask if SAVEMASK is nonzero.  Return 0.  */
104: # define sigsetjmp(env, savemask)       __sigsetjmp (env, savemask)
105: 
106: /* Jump to the environment saved in ENV, making the
107:    sigsetjmp call there return VAL, or 1 if VAL is 0.
108:    Restore the signal mask if that sigsetjmp call saved it.
109:    This is just an alias `longjmp'.  */
110: extern void siglongjmp (sigjmp_buf __env, int __val)
111:      __THROWNL __attribute__ ((__noreturn__));
112: #endif /* Use POSIX.  */
113: 
114: 
115: /* Define helper functions to catch unsafe code.  */
116: #if __USE_FORTIFY_LEVEL > 0
117: # include <bits/setjmp2.h>
118: #endif
119: 
120: __END_DECLS
121: 
122: #endif /* setjmp.h  */
123: 

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