2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
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9 * modification, are permitted provided that the following conditions
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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.
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36 * @(#)error.c 8.2 (Berkeley) 5/4/95
37 * $FreeBSD: src/bin/sh/error.c,v 1.33 2010/12/21 20:47:06 jilles Exp $
41 * Errors and exceptions.
49 #include "eval.h" /* defines commandname */
50 #include "nodes.h" /* show.h needs nodes.h */
60 * Code to handle exceptions in C.
63 struct jmploc *handler;
64 volatile sig_atomic_t exception;
65 volatile sig_atomic_t suppressint;
66 volatile sig_atomic_t intpending;
69 static void exverror(int, const char *, va_list) __printf0like(2, 0) __dead2;
72 * Called to raise an exception. Since C doesn't include exceptions, we
73 * just do a longjmp to the exception handler. The type of exception is
74 * stored in the global variable "exception".
76 * Interrupts are disabled; they should be reenabled when the exception is
87 longjmp(handler->loc, 1);
92 * Called from trap.c when a SIGINT is received. (If the user specifies
93 * that SIGINT is to be trapped or ignored using the trap builtin, then
94 * this routine is not called.) Suppressint is nonzero when interrupts
95 * are held using the INTOFF macro. If SIGINTs are not suppressed and
96 * the shell is not a root shell, then we want to be terminated if we
97 * get here, as if we were terminated directly by a SIGINT. Arrange for
107 * The !in_dotrap here is safe. The only way we can arrive here
108 * with in_dotrap set is that a trap handler set SIGINT to SIG_DFL
112 if (suppressint && !in_dotrap) {
118 sigprocmask(SIG_SETMASK, &sigs, NULL);
121 * This doesn't seem to be needed, since main() emits a newline.
124 if (tcgetpgrp(0) == getpid())
125 write(STDERR_FILENO, "\n", 1);
127 if (rootshell && iflag)
130 signal(SIGINT, SIG_DFL);
131 kill(getpid(), SIGINT);
137 vwarning(const char *msg, va_list ap)
140 outfmt(out2, "%s: ", commandname);
141 doformat(out2, msg, ap);
147 warning(const char *msg, ...)
157 * Exverror is called to raise the error exception. If the first argument
158 * is not NULL then error prints an error message using printf style
159 * formatting. It then raises the error exception.
162 exverror(int cond, const char *msg, va_list ap)
165 * An interrupt trumps an error. Certain places catch error
166 * exceptions or transform them to a plain nonzero exit code
167 * in child processes, and if an error exception can be handled,
168 * an interrupt can be handled as well.
170 * exraise() will disable interrupts for the exception handler.
176 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid()));
178 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
188 error(const char *msg, ...)
192 exverror(EXERROR, msg, ap);
198 exerror(int cond, const char *msg, ...)
202 exverror(cond, msg, ap);