1235368Sgnn/*- 2235368Sgnn * Copyright (c) 1991, 1993 3235368Sgnn * The Regents of the University of California. All rights reserved. 4235368Sgnn * 5235368Sgnn * This code is derived from software contributed to Berkeley by 6235368Sgnn * Kenneth Almquist. 7235368Sgnn * 8235368Sgnn * Redistribution and use in source and binary forms, with or without 9235368Sgnn * modification, are permitted provided that the following conditions 10235368Sgnn * are met: 11235368Sgnn * 1. Redistributions of source code must retain the above copyright 12235368Sgnn * notice, this list of conditions and the following disclaimer. 13235368Sgnn * 2. Redistributions in binary form must reproduce the above copyright 14235368Sgnn * notice, this list of conditions and the following disclaimer in the 15235368Sgnn * documentation and/or other materials provided with the distribution. 16235368Sgnn * 4. Neither the name of the University nor the names of its contributors 17235368Sgnn * may be used to endorse or promote products derived from this software 18235368Sgnn * without specific prior written permission. 19235368Sgnn * 20235368Sgnn * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21235368Sgnn * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22235368Sgnn * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23235368Sgnn * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24235368Sgnn * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25235368Sgnn * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26235368Sgnn * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27235368Sgnn * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28235368Sgnn * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29235368Sgnn * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30235368Sgnn * SUCH DAMAGE. 31235368Sgnn */ 32235368Sgnn 33235368Sgnn#ifndef lint 34235368Sgnn#if 0 35235368Sgnnstatic char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95"; 36235368Sgnn#endif 37235368Sgnn#endif /* not lint */ 38235368Sgnn#include <sys/cdefs.h> 39235368Sgnn__FBSDID("$FreeBSD: releng/11.0/bin/sh/error.c 279569 2015-03-03 21:21:43Z jilles $"); 40235368Sgnn 41235368Sgnn/* 42235368Sgnn * Errors and exceptions. 43235368Sgnn */ 44235368Sgnn 45235368Sgnn#include "shell.h" 46235368Sgnn#include "eval.h" 47235368Sgnn#include "main.h" 48235368Sgnn#include "options.h" 49235368Sgnn#include "output.h" 50235368Sgnn#include "error.h" 51235368Sgnn#include "nodes.h" /* show.h needs nodes.h */ 52235368Sgnn#include "show.h" 53235368Sgnn#include "trap.h" 54235368Sgnn#include <signal.h> 55235368Sgnn#include <stdlib.h> 56235368Sgnn#include <unistd.h> 57235368Sgnn#include <errno.h> 58235368Sgnn 59235368Sgnn 60235368Sgnn/* 61235368Sgnn * Code to handle exceptions in C. 62235368Sgnn */ 63235368Sgnn 64235368Sgnnstruct jmploc *handler; 65235368Sgnnvolatile sig_atomic_t exception; 66235368Sgnnvolatile sig_atomic_t suppressint; 67235368Sgnnvolatile sig_atomic_t intpending; 68235368Sgnn 69235368Sgnn 70235368Sgnnstatic void exverror(int, const char *, va_list) __printf0like(2, 0) __dead2; 71235368Sgnn 72235368Sgnn/* 73235368Sgnn * Called to raise an exception. Since C doesn't include exceptions, we 74235368Sgnn * just do a longjmp to the exception handler. The type of exception is 75235368Sgnn * stored in the global variable "exception". 76235368Sgnn * 77235368Sgnn * Interrupts are disabled; they should be reenabled when the exception is 78235368Sgnn * caught. 79235368Sgnn */ 80235368Sgnn 81235368Sgnnvoid 82235368Sgnnexraise(int e) 83235368Sgnn{ 84235368Sgnn INTOFF; 85235368Sgnn if (handler == NULL) 86235368Sgnn abort(); 87235368Sgnn exception = e; 88235368Sgnn longjmp(handler->loc, 1); 89235368Sgnn} 90 91 92/* 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. 101 */ 102 103void 104onint(void) 105{ 106 sigset_t sigs; 107 108 intpending = 0; 109 sigemptyset(&sigs); 110 sigprocmask(SIG_SETMASK, &sigs, NULL); 111 112 /* 113 * This doesn't seem to be needed, since main() emits a newline. 114 */ 115#if 0 116 if (tcgetpgrp(0) == getpid()) 117 write(STDERR_FILENO, "\n", 1); 118#endif 119 if (rootshell && iflag) 120 exraise(EXINT); 121 else { 122 signal(SIGINT, SIG_DFL); 123 kill(getpid(), SIGINT); 124 _exit(128 + SIGINT); 125 } 126} 127 128 129static void 130vwarning(const char *msg, va_list ap) 131{ 132 if (commandname) 133 outfmt(out2, "%s: ", commandname); 134 else if (arg0) 135 outfmt(out2, "%s: ", arg0); 136 doformat(out2, msg, ap); 137 out2fmt_flush("\n"); 138} 139 140 141void 142warning(const char *msg, ...) 143{ 144 va_list ap; 145 va_start(ap, msg); 146 vwarning(msg, ap); 147 va_end(ap); 148} 149 150 151/* 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. 155 */ 156static void 157exverror(int cond, const char *msg, va_list ap) 158{ 159 /* 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. 164 * 165 * exraise() will disable interrupts for the exception handler. 166 */ 167 FORCEINTON; 168 169#ifdef DEBUG 170 if (msg) 171 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 172 else 173 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 174#endif 175 if (msg) 176 vwarning(msg, ap); 177 flushall(); 178 exraise(cond); 179} 180 181 182void 183error(const char *msg, ...) 184{ 185 va_list ap; 186 va_start(ap, msg); 187 exverror(EXERROR, msg, ap); 188 va_end(ap); 189} 190 191 192void 193exerror(int cond, const char *msg, ...) 194{ 195 va_list ap; 196 va_start(ap, msg); 197 exverror(cond, msg, ap); 198 va_end(ap); 199} 200