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. 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. 19 * 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 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95"; 36 #endif 37 #endif /* not lint */ 38 #include <sys/cdefs.h> 39 /* 40 * Errors and exceptions. 41 */ 42 43 #include "shell.h" 44 #include "eval.h" 45 #include "main.h" 46 #include "options.h" 47 #include "output.h" 48 #include "error.h" 49 #include "nodes.h" /* show.h needs nodes.h */ 50 #include "show.h" 51 #include "trap.h" 52 #include <signal.h> 53 #include <stdlib.h> 54 #include <unistd.h> 55 #include <errno.h> 56 57 58 /* 59 * Code to handle exceptions in C. 60 */ 61 62 struct jmploc *handler; 63 volatile sig_atomic_t exception; 64 volatile sig_atomic_t suppressint; 65 volatile sig_atomic_t intpending; 66 67 68 static void verrorwithstatus(int, const char *, va_list) __printf0like(2, 0) __dead2; 69 70 /* 71 * Called to raise an exception. Since C doesn't include exceptions, we 72 * just do a longjmp to the exception handler. The type of exception is 73 * stored in the global variable "exception". 74 * 75 * Interrupts are disabled; they should be re-enabled when the exception is 76 * caught. 77 */ 78 79 void 80 exraise(int e) 81 { 82 INTOFF; 83 if (handler == NULL) 84 abort(); 85 exception = e; 86 longjmp(handler->loc, 1); 87 } 88 89 90 /* 91 * Called from trap.c when a SIGINT is received and not suppressed, or when 92 * an interrupt is pending and interrupts are re-enabled using INTON. 93 * (If the user specifies that SIGINT is to be trapped or ignored using the 94 * trap builtin, then this routine is not called.) Suppressint is nonzero 95 * when interrupts are held using the INTOFF macro. If SIGINTs are not 96 * suppressed and the shell is not a root shell, then we want to be 97 * terminated if we get here, as if we were terminated directly by a SIGINT. 98 * Arrange for this here. 99 */ 100 101 void 102 onint(void) 103 { 104 sigset_t sigs; 105 106 intpending = 0; 107 sigemptyset(&sigs); 108 sigprocmask(SIG_SETMASK, &sigs, NULL); 109 110 /* 111 * This doesn't seem to be needed, since main() emits a newline. 112 */ 113 #if 0 114 if (tcgetpgrp(0) == getpid()) 115 write(STDERR_FILENO, "\n", 1); 116 #endif 117 if (rootshell && iflag) 118 exraise(EXINT); 119 else { 120 signal(SIGINT, SIG_DFL); 121 kill(getpid(), SIGINT); 122 _exit(128 + SIGINT); 123 } 124 } 125 126 127 static void 128 vwarning(const char *msg, va_list ap) 129 { 130 if (commandname) 131 outfmt(out2, "%s: ", commandname); 132 else if (arg0) 133 outfmt(out2, "%s: ", arg0); 134 doformat(out2, msg, ap); 135 out2fmt_flush("\n"); 136 } 137 138 139 void 140 warning(const char *msg, ...) 141 { 142 va_list ap; 143 va_start(ap, msg); 144 vwarning(msg, ap); 145 va_end(ap); 146 } 147 148 149 /* 150 * Exverror is called to raise the error exception. If the first argument 151 * is not NULL then error prints an error message using printf style 152 * formatting. It then raises the error exception. 153 */ 154 static void 155 verrorwithstatus(int status, const char *msg, va_list ap) 156 { 157 /* 158 * An interrupt trumps an error. Certain places catch error 159 * exceptions or transform them to a plain nonzero exit code 160 * in child processes, and if an error exception can be handled, 161 * an interrupt can be handled as well. 162 * 163 * exraise() will disable interrupts for the exception handler. 164 */ 165 FORCEINTON; 166 167 #ifdef DEBUG 168 if (msg) 169 TRACE(("verrorwithstatus(%d, \"%s\") pid=%d\n", 170 status, msg, getpid())); 171 else 172 TRACE(("verrorwithstatus(%d, NULL) pid=%d\n", 173 status, getpid())); 174 #endif 175 if (msg) 176 vwarning(msg, ap); 177 flushall(); 178 exitstatus = status; 179 exraise(EXERROR); 180 } 181 182 183 void 184 error(const char *msg, ...) 185 { 186 va_list ap; 187 va_start(ap, msg); 188 verrorwithstatus(2, msg, ap); 189 va_end(ap); 190 } 191 192 193 void 194 errorwithstatus(int status, const char *msg, ...) 195 { 196 va_list ap; 197 va_start(ap, msg); 198 verrorwithstatus(status, msg, ap); 199 va_end(ap); 200 } 201