1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 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. 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. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)error.c 8.2 (Berkeley) 5/4/95 37 * $FreeBSD: src/bin/sh/error.c,v 1.26 2006/02/04 14:37:50 schweikh Exp $ 38 * $DragonFly: src/bin/sh/error.c,v 1.4 2007/01/06 03:44:04 pavalos Exp $ 39 */ 40 41 /* 42 * Errors and exceptions. 43 */ 44 45 #include "shell.h" 46 #include "main.h" 47 #include "options.h" 48 #include "output.h" 49 #include "error.h" 50 #include "eval.h" /* defines commandname */ 51 #include "nodes.h" /* show.h needs nodes.h */ 52 #include "show.h" 53 #include "trap.h" 54 #include <signal.h> 55 #include <stdlib.h> 56 #include <unistd.h> 57 #include <errno.h> 58 59 60 /* 61 * Code to handle exceptions in C. 62 */ 63 64 struct jmploc *handler; 65 volatile sig_atomic_t exception; 66 volatile sig_atomic_t suppressint; 67 volatile sig_atomic_t intpending; 68 69 70 static void exverror(int, const char *, va_list) __printf0like(2, 0); 71 72 /* 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". 76 */ 77 78 void 79 exraise(int e) 80 { 81 if (handler == NULL) 82 abort(); 83 exception = e; 84 longjmp(handler->loc, 1); 85 } 86 87 88 /* 89 * Called from trap.c when a SIGINT is received. (If the user specifies 90 * that SIGINT is to be trapped or ignored using the trap builtin, then 91 * this routine is not called.) Suppressint is nonzero when interrupts 92 * are held using the INTOFF macro. If SIGINTs are not suppressed and 93 * the shell is not a root shell, then we want to be terminated if we 94 * get here, as if we were terminated directly by a SIGINT. Arrange for 95 * this here. 96 */ 97 98 void 99 onint(void) 100 { 101 sigset_t sigset; 102 103 /* 104 * The !in_dotrap here is safe. The only way we can arrive here 105 * with in_dotrap set is that a trap handler set SIGINT to SIG_DFL 106 * and killed itself. 107 */ 108 109 if (suppressint && !in_dotrap) { 110 intpending++; 111 return; 112 } 113 intpending = 0; 114 sigemptyset(&sigset); 115 sigprocmask(SIG_SETMASK, &sigset, NULL); 116 117 /* 118 * This doesn't seem to be needed, since main() emits a newline. 119 */ 120 #if 0 121 if (tcgetpgrp(0) == getpid()) 122 write(STDERR_FILENO, "\n", 1); 123 #endif 124 if (rootshell && iflag) 125 exraise(EXINT); 126 else { 127 signal(SIGINT, SIG_DFL); 128 kill(getpid(), SIGINT); 129 } 130 } 131 132 133 /* 134 * Exverror is called to raise the error exception. If the first argument 135 * is not NULL then error prints an error message using printf style 136 * formatting. It then raises the error exception. 137 */ 138 static void 139 exverror(int cond, const char *msg, va_list ap) 140 { 141 CLEAR_PENDING_INT; 142 INTOFF; 143 144 #ifdef DEBUG 145 if (msg) 146 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 147 else 148 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 149 #endif 150 if (msg) { 151 if (commandname) 152 outfmt(&errout, "%s: ", commandname); 153 doformat(&errout, msg, ap); 154 out2c('\n'); 155 } 156 flushall(); 157 exraise(cond); 158 } 159 160 161 void 162 error(const char *msg, ...) 163 { 164 va_list ap; 165 va_start(ap, msg); 166 exverror(EXERROR, msg, ap); 167 va_end(ap); 168 } 169 170 171 void 172 exerror(int cond, const char *msg, ...) 173 { 174 va_list ap; 175 va_start(ap, msg); 176 exverror(cond, msg, ap); 177 va_end(ap); 178 } 179