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("$FreeBSD$");
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 exverror(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 exverror(int cond
, 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(("exverror(%d, \"%s\") pid=%d\n", cond
, msg
, getpid()));
173 TRACE(("exverror(%d, NULL) pid=%d\n", cond
, getpid()));
183 error(const char *msg
, ...)
187 exverror(EXERROR
, msg
, ap
);
193 exerror(int cond
, const char *msg
, ...)
197 exverror(cond
, msg
, ap
);