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 * $Id: error.h,v 1.9 1998/08/24 19:15:48 cracauer Exp $ 38 */ 39 40 /* 41 * Types of operations (passed to the errmsg routine). 42 */ 43 44 #define E_OPEN 01 /* opening a file */ 45 #define E_CREAT 02 /* creating a file */ 46 #define E_EXEC 04 /* executing a program */ 47 48 49 /* 50 * We enclose jmp_buf in a structure so that we can declare pointers to 51 * jump locations. The global variable handler contains the location to 52 * jump to when an exception occurs, and the global variable exception 53 * contains a code identifying the exception. To implement nested 54 * exception handlers, the user should save the value of handler on entry 55 * to an inner scope, set handler to point to a jmploc structure for the 56 * inner scope, and restore handler on exit from the scope. 57 */ 58 59 #include <setjmp.h> 60 #include <signal.h> 61 62 struct jmploc { 63 jmp_buf loc; 64 }; 65 66 extern struct jmploc *handler; 67 extern volatile sig_atomic_t 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 sig_atomic_t suppressint; 84 extern volatile sig_atomic_t 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)); 94 void onint __P((void)); 95 void error __P((char *, ...)); 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 #ifdef BSD 106 #define setjmp(jmploc) _setjmp(jmploc) 107 #define longjmp(jmploc, val) _longjmp(jmploc, val) 108 #endif 109