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. 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
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95";
36 #endif
37 #endif /* not lint */
38 #include <sys/cdefs.h>
39 /*
40 * Errors and exceptions.
41 */
42
43 #include "shell.h"
44 #include "eval.h"
45 #include "main.h"
46 #include "options.h"
47 #include "output.h"
48 #include "error.h"
49 #include "nodes.h" /* show.h needs nodes.h */
50 #include "show.h"
51 #include "trap.h"
52 #include <signal.h>
53 #include <stdlib.h>
54 #include <unistd.h>
55 #include <errno.h>
56
57
58 /*
59 * Code to handle exceptions in C.
60 */
61
62 struct jmploc *handler;
63 volatile sig_atomic_t exception;
64 volatile sig_atomic_t suppressint;
65 volatile sig_atomic_t intpending;
66
67
68 static void verrorwithstatus(int, const char *, va_list) __printf0like(2, 0) __dead2;
69
70 /*
71 * Called to raise an exception. Since C doesn't include exceptions, we
72 * just do a longjmp to the exception handler. The type of exception is
73 * stored in the global variable "exception".
74 *
75 * Interrupts are disabled; they should be re-enabled when the exception is
76 * caught.
77 */
78
79 void
exraise(int e)80 exraise(int e)
81 {
82 INTOFF;
83 if (handler == NULL)
84 abort();
85 exception = e;
86 longjmp(handler->loc, 1);
87 }
88
89
90 /*
91 * Called from trap.c when a SIGINT is received and not suppressed, or when
92 * an interrupt is pending and interrupts are re-enabled using INTON.
93 * (If the user specifies that SIGINT is to be trapped or ignored using the
94 * trap builtin, then this routine is not called.) Suppressint is nonzero
95 * when interrupts are held using the INTOFF macro. If SIGINTs are not
96 * suppressed and the shell is not a root shell, then we want to be
97 * terminated if we get here, as if we were terminated directly by a SIGINT.
98 * Arrange for this here.
99 */
100
101 void
onint(void)102 onint(void)
103 {
104 sigset_t sigs;
105
106 intpending = 0;
107 sigemptyset(&sigs);
108 sigprocmask(SIG_SETMASK, &sigs, NULL);
109
110 /*
111 * This doesn't seem to be needed, since main() emits a newline.
112 */
113 #if 0
114 if (tcgetpgrp(0) == getpid())
115 write(STDERR_FILENO, "\n", 1);
116 #endif
117 if (rootshell && iflag)
118 exraise(EXINT);
119 else {
120 signal(SIGINT, SIG_DFL);
121 kill(getpid(), SIGINT);
122 _exit(128 + SIGINT);
123 }
124 }
125
126
127 static void
vwarning(const char * msg,va_list ap)128 vwarning(const char *msg, va_list ap)
129 {
130 if (commandname)
131 outfmt(out2, "%s: ", commandname);
132 else if (arg0)
133 outfmt(out2, "%s: ", arg0);
134 doformat(out2, msg, ap);
135 out2fmt_flush("\n");
136 }
137
138
139 void
warning(const char * msg,...)140 warning(const char *msg, ...)
141 {
142 va_list ap;
143 va_start(ap, msg);
144 vwarning(msg, ap);
145 va_end(ap);
146 }
147
148
149 /*
150 * Exverror is called to raise the error exception. If the first argument
151 * is not NULL then error prints an error message using printf style
152 * formatting. It then raises the error exception.
153 */
154 static void
verrorwithstatus(int status,const char * msg,va_list ap)155 verrorwithstatus(int status, const char *msg, va_list ap)
156 {
157 /*
158 * An interrupt trumps an error. Certain places catch error
159 * exceptions or transform them to a plain nonzero exit code
160 * in child processes, and if an error exception can be handled,
161 * an interrupt can be handled as well.
162 *
163 * exraise() will disable interrupts for the exception handler.
164 */
165 FORCEINTON;
166
167 #ifdef DEBUG
168 if (msg)
169 TRACE(("verrorwithstatus(%d, \"%s\") pid=%d\n",
170 status, msg, getpid()));
171 else
172 TRACE(("verrorwithstatus(%d, NULL) pid=%d\n",
173 status, getpid()));
174 #endif
175 if (msg)
176 vwarning(msg, ap);
177 flushall();
178 exitstatus = status;
179 exraise(EXERROR);
180 }
181
182
183 void
error(const char * msg,...)184 error(const char *msg, ...)
185 {
186 va_list ap;
187 va_start(ap, msg);
188 verrorwithstatus(2, msg, ap);
189 va_end(ap);
190 }
191
192
193 void
errorwithstatus(int status,const char * msg,...)194 errorwithstatus(int status, const char *msg, ...)
195 {
196 va_list ap;
197 va_start(ap, msg);
198 verrorwithstatus(status, msg, ap);
199 va_end(ap);
200 }
201