1/*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 1997-2005 5 * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35/* 36 * Errors and exceptions. 37 */ 38 39#include <signal.h> 40#include <stdlib.h> 41#include <string.h> 42#include <unistd.h> 43#include <stdio.h> 44#include <string.h> 45 46#include "shell.h" 47#include "main.h" 48#include "options.h" 49#include "output.h" 50#include "error.h" 51#include "show.h" 52#include "eval.h" 53#include "parser.h" 54#include "system.h" 55 56 57/* 58 * Code to handle exceptions in C. 59 */ 60 61struct jmploc *handler; 62int exception; 63int suppressint; 64volatile sig_atomic_t intpending; 65int errlinno; 66 67 68static void exverror(int, const char *, va_list) 69 __attribute__((__noreturn__)); 70 71/* 72 * Called to raise an exception. Since C doesn't include exceptions, we 73 * just do a longjmp to the exception handler. The type of exception is 74 * stored in the global variable "exception". 75 */ 76 77void 78exraise(int e) 79{ 80#ifdef DEBUG 81 if (handler == NULL) 82 abort(); 83#endif 84 INTOFF; 85 86 exception = e; 87 longjmp(handler->loc, 1); 88} 89 90 91/* 92 * Called from trap.c when a SIGINT is received. (If the user specifies 93 * that SIGINT is to be trapped or ignored using the trap builtin, then 94 * this routine is not called.) Suppressint is nonzero when interrupts 95 * are held using the INTOFF macro. (The test for iflag is just 96 * defensive programming.) 97 */ 98 99void 100onint(void) { 101 102 intpending = 0; 103 sigclearmask(); 104 if (!(rootshell && iflag)) { 105 signal(SIGINT, SIG_DFL); 106 raise(SIGINT); 107 } 108 exitstatus = SIGINT + 128; 109 exraise(EXINT); 110 /* NOTREACHED */ 111} 112 113static void 114exvwarning2(const char *msg, va_list ap) 115{ 116 struct output *errs; 117 const char *name; 118 const char *fmt; 119 120 errs = out2; 121 name = arg0 ? arg0 : "sh"; 122 if (!commandname) 123 fmt = "%s: %d: "; 124 else 125 fmt = "%s: %d: %s: "; 126 outfmt(errs, fmt, name, errlinno, commandname); 127 doformat(errs, msg, ap); 128#if FLUSHERR 129 outc('\n', errs); 130#else 131 outcslow('\n', errs); 132#endif 133} 134 135#define exvwarning(a, b, c) exvwarning2(b, c) 136 137/* 138 * Exverror is called to raise the error exception. If the second argument 139 * is not NULL then error prints an error message using printf style 140 * formatting. It then raises the error exception. 141 */ 142static void 143exverror(int cond, const char *msg, va_list ap) 144{ 145#ifdef DEBUG 146 if (msg) { 147 va_list aq; 148 TRACE(("exverror(%d, \"", cond)); 149 va_copy(aq, ap); 150 TRACEV((msg, aq)); 151 va_end(aq); 152 TRACE(("\") pid=%d\n", getpid())); 153 } else 154 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 155 if (msg) 156#endif 157 exvwarning(-1, msg, ap); 158 159 flushall(); 160 exraise(cond); 161 /* NOTREACHED */ 162} 163 164 165void 166sh_error(const char *msg, ...) 167{ 168 va_list ap; 169 170 exitstatus = 2; 171 172 va_start(ap, msg); 173 exverror(EXERROR, msg, ap); 174 /* NOTREACHED */ 175 va_end(ap); 176} 177 178 179void 180exerror(int cond, const char *msg, ...) 181{ 182 va_list ap; 183 184 va_start(ap, msg); 185 exverror(cond, msg, ap); 186 /* NOTREACHED */ 187 va_end(ap); 188} 189 190/* 191 * error/warning routines for external builtins 192 */ 193 194void 195sh_warnx(const char *fmt, ...) 196{ 197 va_list ap; 198 199 va_start(ap, fmt); 200 exvwarning(-1, fmt, ap); 201 va_end(ap); 202} 203 204 205/* 206 * Return a string describing an error. The returned string may be a 207 * pointer to a static buffer that will be overwritten on the next call. 208 * Action describes the operation that got the error. 209 */ 210 211const char * 212errmsg(int e, int action) 213{ 214 if (e != ENOENT && e != ENOTDIR) 215 return strerror(e); 216 217 if (action & E_OPEN) 218 return "No such file"; 219 else if (action & E_CREAT) 220 return "Directory nonexistent"; 221 else 222 return "not found"; 223} 224 225 226#ifdef REALLY_SMALL 227void 228__inton() { 229 if (--suppressint == 0 && intpending) { 230 onint(); 231 } 232} 233#endif 234