bin/sh/error.h

   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.h     8.2 (Berkeley) 5/4/95
  37  * $FreeBSD: src/bin/sh/error.h,v 1.17 2004/04/06 20:06:51 markm Exp $
  38  * $DragonFly: src/bin/sh/error.h,v 1.4 2007/01/06 03:44:04 pavalos Exp $
  39  */
  40
  41 /*
  42  * We enclose jmp_buf in a structure so that we can declare pointers to
  43  * jump locations.  The global variable handler contains the location to
  44  * jump to when an exception occurs, and the global variable exception
  45  * contains a code identifying the exception.  To implement nested
  46  * exception handlers, the user should save the value of handler on entry
  47  * to an inner scope, set handler to point to a jmploc structure for the
  48  * inner scope, and restore handler on exit from the scope.
  49  */
  50
  51 #include <setjmp.h>
  52 #include <signal.h>
  53
  54 struct jmploc {
  55         jmp_buf loc;
  56 };
  57
  58 extern struct jmploc *handler;
  59 extern volatile sig_atomic_t exception;
  60
  61 /* exceptions */
  62 #define EXINT 0         /* SIGINT received */
  63 #define EXERROR 1       /* a generic error */
  64 #define EXSHELLPROC 2   /* execute a shell procedure */
  65 #define EXEXEC 3        /* command execution failed */
  66
  67
  68 /*
  69  * These macros allow the user to suspend the handling of interrupt signals
  70  * over a period of time.  This is similar to SIGHOLD to or sigblock, but
  71  * much more efficient and portable.  (But hacking the kernel is so much
  72  * more fun than worrying about efficiency and portability. :-))
  73  */
  74
  75 extern volatile sig_atomic_t suppressint;
  76 extern volatile sig_atomic_t intpending;
  77
  78 #define INTOFF suppressint++
  79 #define INTON { if (--suppressint == 0 && intpending) onint(); }
  80 #define FORCEINTON {suppressint = 0; if (intpending) onint();}
  81 #define CLEAR_PENDING_INT intpending = 0
  82 #define int_pending() intpending
  83
  84 void exraise(int);
  85 void onint(void);
  86 void error(const char *, ...) __printf0like(1, 2);
  87 void exerror(int, const char *, ...) __printf0like(2, 3);
  88
  89
  90 /*
  91  * BSD setjmp saves the signal mask, which violates ANSI C and takes time,
  92  * so we use _setjmp instead.
  93  */
  94
  95 #define setjmp(jmploc)  _setjmp(jmploc)
  96 #define longjmp(jmploc, val)    _longjmp(jmploc, val)