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. 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
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29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * Errors and exceptions.
43 #include "nodes.h" /* show.h needs nodes.h */
53 * Code to handle exceptions in C.
56 struct jmploc *handler;
57 volatile sig_atomic_t exception;
58 volatile sig_atomic_t suppressint;
59 volatile sig_atomic_t intpending;
62 static void verrorwithstatus(int, const char *, va_list) __printf0like(2, 0) __dead2;
65 * Called to raise an exception. Since C doesn't include exceptions, we
66 * just do a longjmp to the exception handler. The type of exception is
67 * stored in the global variable "exception".
69 * Interrupts are disabled; they should be re-enabled when the exception is
80 longjmp(handler->loc, 1);
85 * Called from trap.c when a SIGINT is received and not suppressed, or when
86 * an interrupt is pending and interrupts are re-enabled using INTON.
87 * (If the user specifies that SIGINT is to be trapped or ignored using the
88 * trap builtin, then this routine is not called.) Suppressint is nonzero
89 * when interrupts are held using the INTOFF macro. If SIGINTs are not
90 * suppressed and the shell is not a root shell, then we want to be
91 * terminated if we get here, as if we were terminated directly by a SIGINT.
92 * Arrange for this here.
102 sigprocmask(SIG_SETMASK, &sigs, NULL);
105 * This doesn't seem to be needed, since main() emits a newline.
108 if (tcgetpgrp(0) == getpid())
109 write(STDERR_FILENO, "\n", 1);
111 if (rootshell && iflag)
114 signal(SIGINT, SIG_DFL);
115 kill(getpid(), SIGINT);
122 vwarning(const char *msg, va_list ap)
125 outfmt(out2, "%s: ", commandname);
127 outfmt(out2, "%s: ", arg0);
128 doformat(out2, msg, ap);
134 warning(const char *msg, ...)
144 * Exverror is called to raise the error exception. If the first argument
145 * is not NULL then error prints an error message using printf style
146 * formatting. It then raises the error exception.
149 verrorwithstatus(int status, const char *msg, va_list ap)
152 * An interrupt trumps an error. Certain places catch error
153 * exceptions or transform them to a plain nonzero exit code
154 * in child processes, and if an error exception can be handled,
155 * an interrupt can be handled as well.
157 * exraise() will disable interrupts for the exception handler.
163 TRACE(("verrorwithstatus(%d, \"%s\") pid=%d\n",
164 status, msg, getpid()));
166 TRACE(("verrorwithstatus(%d, NULL) pid=%d\n",
178 error(const char *msg, ...)
182 verrorwithstatus(2, msg, ap);
188 errorwithstatus(int status, const char *msg, ...)
192 verrorwithstatus(status, msg, ap);