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 /* 34 * Errors and exceptions. 35 */ 36 37 #include "shell.h" 38 #include "eval.h" 39 #include "main.h" 40 #include "options.h" 41 #include "output.h" 42 #include "error.h" 43 #include "nodes.h" /* show.h needs nodes.h */ 44 #include "show.h" 45 #include "trap.h" 46 #include <signal.h> 47 #include <stdlib.h> 48 #include <unistd.h> 49 #include <errno.h> 50 51 52 /* 53 * Code to handle exceptions in C. 54 */ 55 56 struct jmploc *handler; 57 volatile sig_atomic_t exception; 58 volatile sig_atomic_t suppressint; 59 volatile sig_atomic_t intpending; 60 61 62 static void verrorwithstatus(int, const char *, va_list) __printf0like(2, 0) __dead2; 63 64 /* 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". 68 * 69 * Interrupts are disabled; they should be re-enabled when the exception is 70 * caught. 71 */ 72 73 void 74 exraise(int e) 75 { 76 INTOFF; 77 if (handler == NULL) 78 abort(); 79 exception = e; 80 longjmp(handler->loc, 1); 81 } 82 83 84 /* 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. 93 */ 94 95 void 96 onint(void) 97 { 98 sigset_t sigs; 99 100 intpending = 0; 101 sigemptyset(&sigs); 102 sigprocmask(SIG_SETMASK, &sigs, NULL); 103 104 /* 105 * This doesn't seem to be needed, since main() emits a newline. 106 */ 107 #if 0 108 if (tcgetpgrp(0) == getpid()) 109 write(STDERR_FILENO, "\n", 1); 110 #endif 111 if (rootshell && iflag) 112 exraise(EXINT); 113 else { 114 signal(SIGINT, SIG_DFL); 115 kill(getpid(), SIGINT); 116 _exit(128 + SIGINT); 117 } 118 } 119 120 121 static void 122 vwarning(const char *msg, va_list ap) 123 { 124 if (commandname) 125 outfmt(out2, "%s: ", commandname); 126 else if (arg0) 127 outfmt(out2, "%s: ", arg0); 128 doformat(out2, msg, ap); 129 out2fmt_flush("\n"); 130 } 131 132 133 void 134 warning(const char *msg, ...) 135 { 136 va_list ap; 137 va_start(ap, msg); 138 vwarning(msg, ap); 139 va_end(ap); 140 } 141 142 143 /* 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. 147 */ 148 static void 149 verrorwithstatus(int status, const char *msg, va_list ap) 150 { 151 /* 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. 156 * 157 * exraise() will disable interrupts for the exception handler. 158 */ 159 FORCEINTON; 160 161 #ifdef DEBUG 162 if (msg) 163 TRACE(("verrorwithstatus(%d, \"%s\") pid=%d\n", 164 status, msg, getpid())); 165 else 166 TRACE(("verrorwithstatus(%d, NULL) pid=%d\n", 167 status, getpid())); 168 #endif 169 if (msg) 170 vwarning(msg, ap); 171 flushall(); 172 exitstatus = status; 173 exraise(EXERROR); 174 } 175 176 177 void 178 error(const char *msg, ...) 179 { 180 va_list ap; 181 va_start(ap, msg); 182 verrorwithstatus(2, msg, ap); 183 va_end(ap); 184 } 185 186 187 void 188 errorwithstatus(int status, const char *msg, ...) 189 { 190 va_list ap; 191 va_start(ap, msg); 192 verrorwithstatus(status, msg, ap); 193 va_end(ap); 194 } 195