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error.h revision 1.2 
      1 /*-
      2  * Copyright (c) 1991 The Regents of the University of California.
      3  * 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	5.1 (Berkeley) 3/7/91
     37  *
     38  *	$Id: error.h,v 1.2 1993/03/22 08:04:00 cgd Exp $
     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 
     74 
     75 /*
     76  * These macros allow the user to suspend the handling of interrupt signals
     77  * over a period of time.  This is similar to SIGHOLD to or sigblock, but
     78  * much more efficient and portable.  (But hacking the kernel is so much
     79  * more fun than worrying about efficiency and portability. :-))
     80  */
     81 
     82 extern volatile int suppressint;
     83 extern volatile int intpending;
     84 extern char *commandname;	/* name of command--printed on error */
     85 
     86 #define INTOFF suppressint++
     87 #define INTON if (--suppressint == 0 && intpending) onint(); else
     88 #define FORCEINTON {suppressint = 0; if (intpending) onint();}
     89 #define CLEAR_PENDING_INT intpending = 0
     90 #define int_pending() intpending
     91 
     92 #ifdef __STDC__
     93 void exraise(int);
     94 void onint(void);
     95 void error2(char *, char *);
     96 void error(char *, ...);
     97 char *errmsg(int, int);
     98 #else
     99 void exraise();
    100 void onint();
    101 void error2();
    102 void error();
    103 char *errmsg();
    104 #endif
    105 
    106 
    107 /*
    108  * BSD setjmp saves the signal mask, which violates ANSI C and takes time,
    109  * so we use _setjmp instead.
    110  */
    111 
    112 #ifdef BSD
    113 #define setjmp(jmploc)	_setjmp(jmploc)
    114 #define longjmp(jmploc, val)	_longjmp(jmploc, val)
    115 #endif
    116