1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/* $NetBSD: error.h,v 1.15 2002/11/24 22:35:39 christos Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)error.h 8.2 (Berkeley) 5/4/95
*/
#include <setjmp.h>
#include <signal.h>
/*
* Types of operations (passed to the errmsg routine).
*/
#define E_OPEN 01 /* opening a file */
#define E_CREAT 02 /* creating a file */
#define E_EXEC 04 /* executing a program */
/*
* We enclose jmp_buf in a structure so that we can declare pointers to
* jump locations. The global variable handler contains the location to
* jump to when an exception occurs, and the global variable exception
* contains a code identifying the exeception. To implement nested
* exception handlers, the user should save the value of handler on entry
* to an inner scope, set handler to point to a jmploc structure for the
* inner scope, and restore handler on exit from the scope.
*/
struct jmploc {
jmp_buf loc;
};
extern struct jmploc *handler;
extern int exception;
extern int exerrno; /* error for EXEXEC */
/* exceptions */
#define EXINT 0 /* SIGINT received */
#define EXERROR 1 /* a generic error */
#define EXSHELLPROC 2 /* execute a shell procedure */
#define EXEXEC 3 /* command execution failed */
#define EXEXIT 4 /* exit the shell */
#define EXSIG 5 /* trapped signal in wait(1) */
#define EXEVAL 6 /* exit the shell due to set -e */
/*
* These macros allow the user to suspend the handling of interrupt signals
* over a period of time. This is similar to SIGHOLD to or sigblock, but
* much more efficient and portable. (But hacking the kernel is so much
* more fun than worrying about efficiency and portability. :-))
*/
extern int suppressint;
extern volatile sig_atomic_t intpending;
extern int exsig;
#define barrier() ({ __asm__ __volatile__ ("": : :"memory"); })
#define INTOFF \
({ \
suppressint++; \
barrier(); \
0; \
})
#ifdef REALLY_SMALL
void __inton __P((void));
#define INTON __inton()
#else
#define INTON \
({ \
barrier(); \
if (--suppressint == 0 && intpending) onint(); \
0; \
})
#endif
#define FORCEINTON \
({ \
barrier(); \
suppressint = 0; \
if (intpending) onint(); \
0; \
})
#define SAVEINT(v) ((v) = suppressint)
#define RESTOREINT(v) \
({ \
barrier(); \
if ((suppressint = (v)) == 0 && intpending) onint(); \
0; \
})
#define CLEAR_PENDING_INT intpending = 0
#define int_pending() intpending
#define EXSIGON() \
({ \
exsig++; \
barrier(); \
if (pendingsigs) \
exraise(EXSIG); \
0; \
})
/* EXSIG is turned off by evalbltin(). */
void exraise(int) __attribute__((__noreturn__));
#ifdef USE_NORETURN
void onint(void) __attribute__((__noreturn__));
#else
void onint(void);
#endif
void error(const char *, ...) __attribute__((__noreturn__));
void exerror(int, const char *, ...) __attribute__((__noreturn__));
const char *errmsg(int, int);
void sh_warnx(const char *, ...);
|