xref: /freebsd/bin/sh/error.h (revision 7f3dea244c40159a41ab22da77a434d7c5b5e85a)
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  * 3. All advertising materials mentioning features or use of this software
17  *    must display the following acknowledgement:
18  *	This product includes software developed by the University of
19  *	California, Berkeley and its contributors.
20  * 4. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  *
36  *	@(#)error.h	8.2 (Berkeley) 5/4/95
37  * $FreeBSD$
38  */
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 exception.  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 
59 #include <setjmp.h>
60 #include <signal.h>
61 
62 struct jmploc {
63 	jmp_buf loc;
64 };
65 
66 extern struct jmploc *handler;
67 extern volatile sig_atomic_t exception;
68 
69 /* exceptions */
70 #define EXINT 0		/* SIGINT received */
71 #define EXERROR 1	/* a generic error */
72 #define EXSHELLPROC 2	/* execute a shell procedure */
73 #define EXEXEC 3	/* command execution failed */
74 
75 
76 /*
77  * These macros allow the user to suspend the handling of interrupt signals
78  * over a period of time.  This is similar to SIGHOLD to or sigblock, but
79  * much more efficient and portable.  (But hacking the kernel is so much
80  * more fun than worrying about efficiency and portability. :-))
81  */
82 
83 extern volatile sig_atomic_t suppressint;
84 extern volatile sig_atomic_t intpending;
85 extern char *commandname;	/* name of command--printed on error */
86 
87 #define INTOFF suppressint++
88 #define INTON { if (--suppressint == 0 && intpending) onint(); }
89 #define FORCEINTON {suppressint = 0; if (intpending) onint();}
90 #define CLEAR_PENDING_INT intpending = 0
91 #define int_pending() intpending
92 
93 void exraise __P((int));
94 void onint __P((void));
95 void error __P((char *, ...));
96 void exerror __P((int, char *, ...));
97 char *errmsg __P((int, int));
98 
99 
100 /*
101  * BSD setjmp saves the signal mask, which violates ANSI C and takes time,
102  * so we use _setjmp instead.
103  */
104 
105 #ifdef BSD
106 #define setjmp(jmploc)	_setjmp(jmploc)
107 #define longjmp(jmploc, val)	_longjmp(jmploc, val)
108 #endif
109