commands/ash/error.c

   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  * 4. 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 /*
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD: src/bin/sh/error.c,v 1.25 2004/04/06 20:06:51 markm Exp $");
  41 */
  42
  43 /*
  44  * Errors and exceptions.
  45  */
  46
  47 #include "shell.h"
  48 #include "main.h"
  49 #include "options.h"
  50 #include "output.h"
  51 #include "error.h"
  52 #include "nodes.h" /* show.h needs nodes.h */
  53 #include "show.h"
  54 #include "trap.h"
  55 #include <signal.h>
  56 #include <stdlib.h>
  57 #include <unistd.h>
  58 #include <errno.h>
  59 #include <sys/types.h>
  60
  61
  62 /*
  63  * Code to handle exceptions in C.
  64  */
  65
  66 struct jmploc *handler;
  67 volatile sig_atomic_t exception;
  68 volatile sig_atomic_t suppressint;
  69 volatile sig_atomic_t intpending;
  70 char *commandname;
  71
  72
  73 static void exverror(int, const char *, va_list) __printf0like(2, 0);
  74
  75 /*
  76  * Called to raise an exception.  Since C doesn't include exceptions, we
  77  * just do a longjmp to the exception handler.  The type of exception is
  78  * stored in the global variable "exception".
  79  */
  80
  81 void
  82 exraise(int e)
  83 {
  84         if (handler == NULL)
  85                 abort();
  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.  If SIGINTs are not suppressed and
  96  * the shell is not a root shell, then we want to be terminated if we
  97  * get here, as if we were terminated directly by a SIGINT.  Arrange for
  98  * this here.
  99  */
 100
 101 void
 102 onint(void)
 103 {
 104         sigset_t sigset;
 105
 106         /*
 107          * The !in_dotrap here is safe.  The only way we can arrive here
 108          * with in_dotrap set is that a trap handler set SIGINT to SIG_DFL
 109          * and killed itself.
 110          */
 111
 112         if (suppressint && !in_dotrap) {
 113                 intpending++;
 114                 return;
 115         }
 116         intpending = 0;
 117         sigemptyset(&sigset);
 118         sigprocmask(SIG_SETMASK, &sigset, NULL);
 119
 120         /*
 121          * This doesn't seem to be needed, since main() emits a newline.
 122          */
 123 #if 0
 124         if (tcgetpgrp(0) == getpid())
 125                 write(STDERR_FILENO, "\n", 1);
 126 #endif
 127         if (rootshell && iflag)
 128                 exraise(EXINT);
 129         else {
 130                 signal(SIGINT, SIG_DFL);
 131                 kill(getpid(), SIGINT);
 132         }
 133 }
 134
 135
 136 /*
 137  * Exverror is called to raise the error exception.  If the first argument
 138  * is not NULL then error prints an error message using printf style
 139  * formatting.  It then raises the error exception.
 140  */
 141 static void
 142 exverror(int cond, const char *msg, va_list ap)
 143 {
 144         CLEAR_PENDING_INT;
 145         INTOFF;
 146
 147 #if DEBUG
 148         if (msg)
 149                 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid()));
 150         else
 151                 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
 152 #endif
 153         if (msg) {
 154                 if (commandname)
 155                         outfmt(&errout, "%s: ", commandname);
 156                 doformat(&errout, msg, ap);
 157                 out2c('\n');
 158         }
 159         flushall();
 160         exraise(cond);
 161 }
 162
 163
 164 void
 165 error(const char *msg, ...)
 166 {
 167         va_list ap;
 168         va_start(ap, msg);
 169         exverror(EXERROR, msg, ap);
 170         va_end(ap);
 171 }
 172
 173
 174 void
 175 exerror(int cond, const char *msg, ...)
 176 {
 177         va_list ap;
 178         va_start(ap, msg);
 179         exverror(cond, msg, ap);
 180         va_end(ap);
 181 }
 182
 183 /*
 184  * $PchId: error.c,v 1.5 2006/04/10 14:36:23 philip Exp $
 185  */