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error.h revision 1.11 
      1 /*	$NetBSD: error.h,v 1.11 1997/07/15 17:44:32 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1991, 1993
      5  *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	@(#)error.h	8.2 (Berkeley) 5/4/95
     39  */
     40 
     41 /*
     42  * Types of operations (passed to the errmsg routine).
     43  */
     44 
     45 #define E_OPEN 01	/* opening a file */
     46 #define E_CREAT 02	/* creating a file */
     47 #define E_EXEC 04	/* executing a program */
     48 
     49 
     50 /*
     51  * We enclose jmp_buf in a structure so that we can declare pointers to
     52  * jump locations.  The global variable handler contains the location to
     53  * jump to when an exception occurs, and the global variable exception
     54  * contains a code identifying the exeception.  To implement nested
     55  * exception handlers, the user should save the value of handler on entry
     56  * to an inner scope, set handler to point to a jmploc structure for the
     57  * inner scope, and restore handler on exit from the scope.
     58  */
     59 
     60 #include <setjmp.h>
     61 
     62 struct jmploc {
     63 	jmp_buf loc;
     64 };
     65 
     66 extern struct jmploc *handler;
     67 extern int exception;
     68 
     69 /* exceptions */
     70 #define EXINT 0		/* SIGINT received */
     71 #define EXERROR 1	/* a generic error */
     72 #define EXSHELLPROC 2	/* execute a shell procedure */
     73 #define EXEXEC 3	/* command execution failed */
     74 
     75 
     76 /*
     77  * These macros allow the user to suspend the handling of interrupt signals
     78  * over a period of time.  This is similar to SIGHOLD to or sigblock, but
     79  * much more efficient and portable.  (But hacking the kernel is so much
     80  * more fun than worrying about efficiency and portability. :-))
     81  */
     82 
     83 extern volatile int suppressint;
     84 extern volatile int intpending;
     85 extern char *commandname;	/* name of command--printed on error */
     86 
     87 #define INTOFF suppressint++
     88 #define INTON { if (--suppressint == 0 && intpending) onint(); }
     89 #define FORCEINTON {suppressint = 0; if (intpending) onint();}
     90 #define CLEAR_PENDING_INT intpending = 0
     91 #define int_pending() intpending
     92 
     93 void exraise __P((int)) __attribute__((__noreturn__));
     94 void onint __P((void));
     95 void error __P((char *, ...)) __attribute__((__noreturn__));
     96 void exerror __P((int, char *, ...));
     97 char *errmsg __P((int, int));
     98 
     99 
    100 /*
    101  * BSD setjmp saves the signal mask, which violates ANSI C and takes time,
    102  * so we use _setjmp instead.
    103  */
    104 
    105 #if defined(BSD) && !defined(__SVR4)
    106 #define setjmp(jmploc)	_setjmp(jmploc)
    107 #define longjmp(jmploc, val)	_longjmp(jmploc, val)
    108 #endif
    109