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-rw-r--r--include/setjmp.h107
1 files changed, 92 insertions, 15 deletions
diff --git a/include/setjmp.h b/include/setjmp.h
index 53d0223fd..821e20bb7 100644
--- a/include/setjmp.h
+++ b/include/setjmp.h
@@ -1,22 +1,99 @@
+/* Copyright (C) 1991,92,93,94,95,96,97,98 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
/*
- setjmp.h
- stubs for future use.
-*/
+ * ISO C Standard: 4.6 NON-LOCAL JUMPS <setjmp.h>
+ */
-#ifndef _SETJMP_H_
-#ifdef __cplusplus
-extern "C" {
-#endif
-#define _SETJMP_H_
+#ifndef _SETJMP_H
+#define _SETJMP_H 1
+
+#include <features.h>
+
+__BEGIN_DECLS
+
+#include <machine/setjmp.h> /* Get `__jmp_buf'. */
+#include <machine/sigset.h> /* Get `__sigset_t'. */
+
+/* Calling environment, plus possibly a saved signal mask. */
+typedef struct __jmp_buf_tag /* C++ doesn't like tagless structs. */
+ {
+ /* NOTE: The machine-dependent definitions of `__sigsetjmp'
+ assume that a `jmp_buf' begins with a `__jmp_buf'.
+ Do not move this member or add others before it. */
+ __jmp_buf __jmpbuf; /* Calling environment. */
+ int __mask_was_saved; /* Saved the signal mask? */
+ __sigset_t __saved_mask; /* Saved signal mask. */
+ } jmp_buf[1];
-#include "_ansi.h"
-#include <machine/setjmp.h>
-void _EXFUN(longjmp,(jmp_buf __jmpb, int __retval));
-int _EXFUN(setjmp,(jmp_buf __jmpb));
+/* Store the calling environment in ENV, also saving the
+ signal mask if SAVEMASK is nonzero. Return 0.
+ This is the internal name for `sigsetjmp'. */
+extern int __sigsetjmp __P ((jmp_buf __env, int __savemask));
-#ifdef __cplusplus
-}
+#ifndef __FAVOR_BSD
+/* Set ENV to the current position and return 0, not saving the signal mask.
+ This is just like `sigsetjmp (ENV, 0)'.
+ The ISO C standard says `setjmp' is a macro. */
+# define setjmp(env) __sigsetjmp ((env), 0)
+#else
+/* We are in 4.3 BSD-compatibility mode in which `setjmp'
+ saves the signal mask like `sigsetjmp (ENV, 1)'. */
+# define setjmp(env) __sigsetjmp ((env), 1)
+#endif /* Favor BSD. */
+
+#if defined __USE_BSD || defined __USE_XOPEN
+/* Set ENV to the current position and return 0, not saving the signal mask.
+ This is the 4.3 BSD name for ISO `setjmp'. */
+# define _setjmp(env) __sigsetjmp ((env), 0)
#endif
-#endif /* _SETJMP_H_ */
+
+/* Jump to the environment saved in ENV, making the
+ `setjmp' call there return VAL, or 1 if VAL is 0. */
+extern void longjmp __P ((jmp_buf __env, int __val))
+ __attribute__ ((__noreturn__));
+#if defined __USE_BSD || defined __USE_XOPEN
+/* Same. Usually `_longjmp' is used with `_setjmp', which does not save
+ the signal mask. But it is how ENV was saved that determines whether
+ `longjmp' restores the mask; `_longjmp' is just an alias. */
+extern void _longjmp __P ((jmp_buf __env, int __val))
+ __attribute__ ((__noreturn__));
+#endif
+
+
+/* Use the same type for `jmp_buf' and `sigjmp_buf'.
+ The `__mask_was_saved' flag determines whether
+ or not `longjmp' will restore the signal mask. */
+typedef jmp_buf sigjmp_buf;
+
+/* Store the calling environment in ENV, also saving the
+ signal mask if SAVEMASK is nonzero. Return 0. */
+# define sigsetjmp(env, savemask) __sigsetjmp ((env), (savemask))
+
+/* Jump to the environment saved in ENV, making the
+ sigsetjmp call there return VAL, or 1 if VAL is 0.
+ Restore the signal mask if that sigsetjmp call saved it.
+ This is just an alias `longjmp'. */
+extern void siglongjmp __P ((sigjmp_buf __env, int __val))
+ __attribute__ ((__noreturn__));
+
+__END_DECLS
+
+#endif /* setjmp.h */