5 files changed, 281 insertions, 0 deletions
diff --git a/setjmp/Makefile b/setjmp/Makefile
new file mode 100644
index 0000000000..4a7e4aa85a
--- /dev/null
+++ b/setjmp/Makefile
@@ -0,0 +1,32 @@
+# 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 Free Software Foundation, Inc., 675 Mass Ave,
+# Cambridge, MA 02139, USA.
+
+#
+#	Makefile for setjmp/longjmp routines
+#
+subdir	:= setjmp
+
+headers	:= setjmp.h jmp_buf.h
+
+routines	:= setjmp sigjmp bsd-setjmp bsd-_setjmp \
+		   longjmp __longjmp
+
+tests		:= tst-setjmp
+
+
+include ../Rules
diff --git a/setjmp/longjmp.c b/setjmp/longjmp.c
new file mode 100644
index 0000000000..d4e4ef7740
--- /dev/null
+++ b/setjmp/longjmp.c
@@ -0,0 +1,40 @@
+/* Copyright (C) 1991, 1992, 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 Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <stddef.h>
+#include <setjmp.h>
+#include <signal.h>
+
+
+/* Set the signal mask to the one specified in ENV, and jump
+   to the position specified in ENV, causing the setjmp
+   call there to return VAL, or 1 if VAL is 0.  */
+void
+longjmp (sigjmp_buf env, int val)
+{
+  if (env[0].__mask_was_saved)
+    /* Restore the saved signal mask.  */
+    (void) __sigprocmask (SIG_SETMASK, &env[0].__saved_mask,
+			  (sigset_t *) NULL);
+
+  /* Call the machine-dependent function to restore machine state.  */
+  __longjmp (env[0].__jmpbuf, val ?: 1);
+}
+
+weak_alias (longjmp, _longjmp)
+weak_alias (longjmp, siglongjmp)
diff --git a/setjmp/setjmp.h b/setjmp/setjmp.h
new file mode 100644
index 0000000000..479cf973ec
--- /dev/null
+++ b/setjmp/setjmp.h
@@ -0,0 +1,112 @@
+/* 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  */
diff --git a/setjmp/sigjmp.c b/setjmp/sigjmp.c
new file mode 100644
index 0000000000..a01c4120da
--- /dev/null
+++ b/setjmp/sigjmp.c
@@ -0,0 +1,36 @@
+/* Copyright (C) 1992, 1994 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., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <stddef.h>
+#include <setjmp.h>
+#include <signal.h>
+
+/* This function is called by the `sigsetjmp' macro
+   before doing a `__setjmp' on ENV[0].__jmpbuf.
+   Always return zero.  */
+
+int
+DEFUN(__sigjmp_save, (env, savemask), sigjmp_buf env AND int savemask)
+{
+  env[0].__mask_was_saved = (savemask &&
+			     __sigprocmask (SIG_BLOCK, (sigset_t *) NULL,
+					    &env[0].__saved_mask) == 0);
+
+  return 0;
+}
diff --git a/setjmp/tst-setjmp.c b/setjmp/tst-setjmp.c
new file mode 100644
index 0000000000..ef6e1f5f9f
--- /dev/null
+++ b/setjmp/tst-setjmp.c
@@ -0,0 +1,61 @@
+/* Copyright (C) 1991, 1992 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., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <stdio.h>
+#include <setjmp.h>
+#include <stdlib.h>
+
+static jmp_buf env;
+static int last_value = -1, lose = 0;
+
+void
+DEFUN(jump, (val), int val)
+{
+  longjmp(env, val);
+}
+
+int
+DEFUN_VOID(main)
+{
+  int value;
+
+  value = setjmp(env);
+  if (value != last_value + 1)
+    {
+      fputs("Shouldn't have ", stdout);
+      lose = 1;
+    }
+  last_value = value;
+  switch (value)
+    {
+    case 0:
+      puts("Saved environment.");
+      jump(0);
+    default:
+      printf("Jumped to %d.\n", value);
+      if (value < 10)
+	jump(value + 1);
+    }
+
+  if (lose || value != 10)
+    puts("Test FAILED!");
+  else
+    puts("Test succeeded!");
+  exit(lose ? EXIT_FAILURE : EXIT_SUCCESS);
+}