| 1 | /*-
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| 2 | * Copyright (c) 1991 The Regents of the University of California.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * This code is derived from software contributed to Berkeley by
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| 6 | * Kenneth Almquist.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions
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| 10 | * are met:
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * 3. All advertising materials mentioning features or use of this software
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| 17 | * must display the following acknowledgement:
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| 18 | * This product includes software developed by the University of
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| 19 | * California, Berkeley and its contributors.
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| 20 | * 4. Neither the name of the University nor the names of its contributors
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| 21 | * may be used to endorse or promote products derived from this software
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| 22 | * without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 34 | * SUCH DAMAGE.
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| 35 | *
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| 36 | * @(#)error.h 5.1 (Berkeley) 3/7/91
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| 37 | */
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| 38 |
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| 39 | /*
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| 40 | * Types of operations (passed to the errmsg routine).
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| 41 | */
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| 42 |
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| 43 | #define E_OPEN 01 /* opening a file */
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| 44 | #define E_CREAT 02 /* creating a file */
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| 45 | #define E_EXEC 04 /* executing a program */
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| 46 |
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| 47 |
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| 48 | /*
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| 49 | * We enclose jmp_buf in a structure so that we can declare pointers to
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| 50 | * jump locations. The global variable handler contains the location to
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| 51 | * jump to when an exception occurs, and the global variable exception
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| 52 | * contains a code identifying the exeception. To implement nested
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| 53 | * exception handlers, the user should save the value of handler on entry
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| 54 | * to an inner scope, set handler to point to a jmploc structure for the
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| 55 | * inner scope, and restore handler on exit from the scope.
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| 56 | */
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| 57 |
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| 58 | #include <setjmp.h>
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| 59 |
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| 60 | struct jmploc {
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| 61 | jmp_buf loc;
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| 62 | };
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| 63 |
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| 64 | extern struct jmploc *handler;
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| 65 | extern int exception;
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| 66 |
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| 67 | /* exceptions */
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| 68 | #define EXINT 0 /* SIGINT received */
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| 69 | #define EXERROR 1 /* a generic error */
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| 70 | #define EXSHELLPROC 2 /* execute a shell procedure */
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| 71 |
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| 72 |
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| 73 | /*
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| 74 | * These macros allow the user to suspend the handling of interrupt signals
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| 75 | * over a period of time. This is similar to SIGHOLD to or sigblock, but
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| 76 | * much more efficient and portable. (But hacking the kernel is so much
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| 77 | * more fun than worrying about efficiency and portability. :-))
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| 78 | */
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| 79 |
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| 80 | extern volatile int suppressint;
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| 81 | extern volatile int intpending;
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| 82 | extern char *commandname; /* name of command--printed on error */
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| 83 |
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| 84 | #define INTOFF suppressint++
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| 85 | #define INTON if (--suppressint == 0 && intpending) onint(); else
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| 86 | #define FORCEINTON {suppressint = 0; if (intpending) onint();}
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| 87 | #define CLEAR_PENDING_INT intpending = 0
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| 88 | #define int_pending() intpending
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| 89 |
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| 90 | #ifdef __STDC__
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| 91 | void exraise(int);
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| 92 | void onint(void);
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| 93 | void error2(char *, char *);
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| 94 | void error(char *, ...);
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| 95 | char *errmsg(int, int);
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| 96 | #else
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| 97 | void exraise();
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| 98 | void onint();
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| 99 | void error2();
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| 100 | void error();
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| 101 | char *errmsg();
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| 102 | #endif
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| 103 |
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| 104 | /* Errmsg uses confusingly different messages. Prefer strerror(). -- kjb */
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| 105 | #define errmsg(errno, action) strerror(errno)
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| 106 |
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| 107 |
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| 108 | /*
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| 109 | * BSD setjmp saves the signal mask, which violates ANSI C and takes time,
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| 110 | * so we use _setjmp instead.
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| 111 | */
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| 112 |
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| 113 | #ifdef BSD
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| 114 | #define setjmp(jmploc) _setjmp(jmploc)
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| 115 | #define longjmp(jmploc, val) _longjmp(jmploc, val)
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| 116 | #endif
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