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
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
35 static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95";
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD: head/bin/sh/error.c 340284 2018-11-09 14:58:24Z jilles $");
42 * Errors and exceptions.
51 #include "nodes.h" /* show.h needs nodes.h */
61 * Code to handle exceptions in C.
64 struct jmploc *handler;
65 volatile sig_atomic_t exception;
66 volatile sig_atomic_t suppressint;
67 volatile sig_atomic_t intpending;
70 static void verrorwithstatus(int, const char *, va_list) __printf0like(2, 0) __dead2;
73 * Called to raise an exception. Since C doesn't include exceptions, we
74 * just do a longjmp to the exception handler. The type of exception is
75 * stored in the global variable "exception".
77 * Interrupts are disabled; they should be reenabled when the exception is
88 longjmp(handler->loc, 1);
93 * Called from trap.c when a SIGINT is received and not suppressed, or when
94 * an interrupt is pending and interrupts are re-enabled using INTON.
95 * (If the user specifies that SIGINT is to be trapped or ignored using the
96 * trap builtin, then this routine is not called.) Suppressint is nonzero
97 * when interrupts are held using the INTOFF macro. If SIGINTs are not
98 * suppressed and the shell is not a root shell, then we want to be
99 * terminated if we get here, as if we were terminated directly by a SIGINT.
100 * Arrange for this here.
110 sigprocmask(SIG_SETMASK, &sigs, NULL);
113 * This doesn't seem to be needed, since main() emits a newline.
116 if (tcgetpgrp(0) == getpid())
117 write(STDERR_FILENO, "\n", 1);
119 if (rootshell && iflag)
122 signal(SIGINT, SIG_DFL);
123 kill(getpid(), SIGINT);
130 vwarning(const char *msg, va_list ap)
133 outfmt(out2, "%s: ", commandname);
135 outfmt(out2, "%s: ", arg0);
136 doformat(out2, msg, ap);
142 warning(const char *msg, ...)
152 * Exverror is called to raise the error exception. If the first argument
153 * is not NULL then error prints an error message using printf style
154 * formatting. It then raises the error exception.
157 verrorwithstatus(int status, const char *msg, va_list ap)
160 * An interrupt trumps an error. Certain places catch error
161 * exceptions or transform them to a plain nonzero exit code
162 * in child processes, and if an error exception can be handled,
163 * an interrupt can be handled as well.
165 * exraise() will disable interrupts for the exception handler.
171 TRACE(("verrorwithstatus(%d, \"%s\") pid=%d\n",
172 status, msg, getpid()));
174 TRACE(("verrorwithstatus(%d, NULL) pid=%d\n",
186 error(const char *msg, ...)
190 verrorwithstatus(2, msg, ap);
196 errorwithstatus(int status, const char *msg, ...)
200 verrorwithstatus(status, msg, ap);