1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 * Copyright (c) 1997-2005
5 *	Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Kenneth Almquist.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *	@(#)error.h	8.2 (Berkeley) 5/4/95
35 */
36
37#include <setjmp.h>
38#include <signal.h>
39
40/*
41 * Types of operations (passed to the errmsg routine).
42 */
43
44#define E_OPEN 01	/* opening a file */
45#define E_CREAT 02	/* creating a file */
46#define E_EXEC 04	/* executing a program */
47
48
49/*
50 * We enclose jmp_buf in a structure so that we can declare pointers to
51 * jump locations.  The global variable handler contains the location to
52 * jump to when an exception occurs, and the global variable exception
53 * contains a code identifying the exeception.  To implement nested
54 * exception handlers, the user should save the value of handler on entry
55 * to an inner scope, set handler to point to a jmploc structure for the
56 * inner scope, and restore handler on exit from the scope.
57 */
58
59struct jmploc {
60	jmp_buf loc;
61};
62
63extern struct jmploc *handler;
64extern int exception;
65
66/* exceptions */
67#define EXINT 0		/* SIGINT received */
68#define EXERROR 1	/* a generic error */
69#define EXEXIT 4	/* exit the shell */
70
71
72/*
73 * These macros allow the user to suspend the handling of interrupt signals
74 * over a period of time.  This is similar to SIGHOLD to or sigblock, but
75 * much more efficient and portable.  (But hacking the kernel is so much
76 * more fun than worrying about efficiency and portability. :-))
77 */
78
79extern int suppressint;
80extern volatile sig_atomic_t intpending;
81
82#define barrier() ({ __asm__ __volatile__ ("": : :"memory"); })
83#define INTOFF \
84	({ \
85		suppressint++; \
86		barrier(); \
87		0; \
88	})
89#ifdef REALLY_SMALL
90void __inton(void);
91#define INTON __inton()
92#else
93#define INTON \
94	({ \
95		barrier(); \
96		if (--suppressint == 0 && intpending) onint(); \
97		0; \
98	})
99#endif
100#define FORCEINTON \
101	({ \
102		barrier(); \
103		suppressint = 0; \
104		if (intpending) onint(); \
105		0; \
106	})
107#define SAVEINT(v) ((v) = suppressint)
108#define RESTOREINT(v) \
109	({ \
110		barrier(); \
111		if ((suppressint = (v)) == 0 && intpending) onint(); \
112		0; \
113	})
114#define CLEAR_PENDING_INT intpending = 0
115#define int_pending() intpending
116
117void exraise(int) __attribute__((__noreturn__));
118#ifdef USE_NORETURN
119void onint(void) __attribute__((__noreturn__));
120#else
121void onint(void);
122#endif
123extern int errlinno;
124void sh_error(const char *, ...) __attribute__((__noreturn__));
125void exerror(int, const char *, ...) __attribute__((__noreturn__));
126const char *errmsg(int, int);
127
128void sh_warnx(const char *, ...);
129