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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /setjmp/setjmp.h
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+/* Copyright (C) 1991, 1992, 1993, 1994, 1995 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, 1992 Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+/*
+ * ANSI Standard: 4.6 NON-LOCAL JUMPS <setjmp.h>
+ */
+
+#ifndef _SETJMP_H
+
+#define _SETJMP_H 1
+#include <features.h>
+
+__BEGIN_DECLS
+
+/* Get the machine-dependent definition of `__jmp_buf'. */
+#include <jmp_buf.h>
+#include <sigset.h> /* Get `__sigset_t'. */
+
+/* Calling environment, plus possibly a saved signal mask. */
+typedef struct
+ {
+ /* 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];
+
+
+/* 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));
+
+#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 ANSI 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. */
+
+#ifdef __USE_BSD
+/* Set ENV to the current position and return 0, not saving the signal mask.
+ This is the 4.3 BSD name for ANSI `setjmp'. */
+#define _setjmp(env) __sigsetjmp ((env), 0)
+#endif
+
+
+/* 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__));
+#ifdef __USE_BSD
+/* 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 BSD. */
+
+/* Internal machine-dependent function to restore context sans signal mask. */
+extern void __longjmp __P ((__jmp_buf __env, int __val))
+ __attribute__ ((__noreturn__));
+
+/* Internal function to possibly save the current mask of blocked signals
+ in ENV, and always set the flag saying whether or not it was saved.
+ This is used by the machine-dependent definition of `__sigsetjmp'.
+ Always returns zero, for convenience. */
+extern int __sigjmp_save __P ((jmp_buf __env, int __savemask));
+
+
+#ifdef __USE_POSIX
+/* 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__));
+#endif /* Use POSIX. */
+
+__END_DECLS
+
+#endif /* setjmp.h */