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 39 /* 40 * Types of operations (passed to the errmsg routine). 41 */ 42 43 #define E_OPEN 01 /* opening a file */ 44 #define E_CREAT 02 /* creating a file */ 45 #define E_EXEC 04 /* executing a program */ 46 47 48 /* 49 * We enclose jmp_buf in a structure so that we can declare pointers to 50 * jump locations. The global variable handler contains the location to 51 * jump to when an exception occurs, and the global variable exception 52 * contains a code identifying the exeception. To implement nested 53 * exception handlers, the user should save the value of handler on entry 54 * to an inner scope, set handler to point to a jmploc structure for the 55 * inner scope, and restore handler on exit from the scope. 56 */ 57 58 #include <setjmp.h> 59 60 struct jmploc { 61 jmp_buf loc; 62 }; 63 64 extern struct jmploc *handler; 65 extern int exception; 66 67 /* exceptions */ 68 #define EXINT 0 /* SIGINT received */ 69 #define EXERROR 1 /* a generic error */ 70 #define EXSHELLPROC 2 /* execute a shell procedure */ 71 72 73 /* 74 * These macros allow the user to suspend the handling of interrupt signals 75 * over a period of time. This is similar to SIGHOLD to or sigblock, but 76 * much more efficient and portable. (But hacking the kernel is so much 77 * more fun than worrying about efficiency and portability. :-)) 78 */ 79 80 extern volatile int suppressint; 81 extern volatile int intpending; 82 extern char *commandname; /* name of command--printed on error */ 83 84 #define INTOFF suppressint++ 85 #define INTON if (--suppressint == 0 && intpending) onint(); else 86 #define FORCEINTON {suppressint = 0; if (intpending) onint();} 87 #define CLEAR_PENDING_INT intpending = 0 88 #define int_pending() intpending 89 90 #ifdef __STDC__ 91 void exraise(int); 92 void onint(void); 93 void error2(char *, char *); 94 void error(char *, ...); 95 char *errmsg(int, int); 96 #else 97 void exraise(); 98 void onint(); 99 void error2(); 100 void error(); 101 char *errmsg(); 102 #endif 103 104 105 /* 106 * BSD setjmp saves the signal mask, which violates ANSI C and takes time, 107 * so we use _setjmp instead. 108 */ 109 110 #ifdef BSD 111 #define setjmp(jmploc) _setjmp(jmploc) 112 #define longjmp(jmploc, val) _longjmp(jmploc, val) 113 #endif 114