1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	@(#)error.h	8.2 (Berkeley) 5/4/95
33 * $FreeBSD$
34 */
35
36/*
37 * We enclose jmp_buf in a structure so that we can declare pointers to
38 * jump locations.  The global variable handler contains the location to
39 * jump to when an exception occurs, and the global variable exception
40 * contains a code identifying the exception.  To implement nested
41 * exception handlers, the user should save the value of handler on entry
42 * to an inner scope, set handler to point to a jmploc structure for the
43 * inner scope, and restore handler on exit from the scope.
44 */
45
46#include <setjmp.h>
47#include <signal.h>
48
49struct jmploc {
50	jmp_buf loc;
51};
52
53extern struct jmploc *handler;
54extern volatile sig_atomic_t exception;
55
56/* exceptions */
57#define EXINT 0		/* SIGINT received */
58#define EXERROR 1	/* a generic error */
59#define EXEXEC 2	/* command execution failed */
60#define EXEXIT 3	/* call exitshell(exitstatus) */
61
62
63/*
64 * These macros allow the user to suspend the handling of interrupt signals
65 * over a period of time.  This is similar to SIGHOLD to or sigblock, but
66 * much more efficient and portable.  (But hacking the kernel is so much
67 * more fun than worrying about efficiency and portability. :-))
68 */
69
70extern volatile sig_atomic_t suppressint;
71extern volatile sig_atomic_t intpending;
72
73#define INTOFF suppressint++
74#define INTON { if (--suppressint == 0 && intpending) onint(); }
75#define is_int_on() suppressint
76#define SETINTON(s) suppressint = (s)
77#define FORCEINTON {suppressint = 0; if (intpending) onint();}
78#define SET_PENDING_INT intpending = 1
79#define CLEAR_PENDING_INT intpending = 0
80#define int_pending() intpending
81
82void exraise(int) __dead2;
83void onint(void) __dead2;
84void warning(const char *, ...) __printflike(1, 2);
85void error(const char *, ...) __printf0like(1, 2) __dead2;
86void exerror(int, const char *, ...) __printf0like(2, 3) __dead2;
87
88
89/*
90 * BSD setjmp saves the signal mask, which violates ANSI C and takes time,
91 * so we use _setjmp instead.
92 */
93
94#define setjmp(jmploc)	_setjmp(jmploc)
95#define longjmp(jmploc, val)	_longjmp(jmploc, val)
96