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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)error.h 8.2 (Berkeley) 5/4/95 33 * $FreeBSD$ 34 */ 35 36 /* 37 * We enclose jmp_buf in a structure so that we can declare pointers to 38 * jump locations. The global variable handler contains the location to 39 * jump to when an exception occurs, and the global variable exception 40 * contains a code identifying the exception. To implement nested 41 * exception handlers, the user should save the value of handler on entry 42 * to an inner scope, set handler to point to a jmploc structure for the 43 * inner scope, and restore handler on exit from the scope. 44 */ 45 46 #include <setjmp.h> 47 #include <signal.h> 48 49 struct jmploc { 50 jmp_buf loc; 51 }; 52 53 extern struct jmploc *handler; 54 extern volatile sig_atomic_t exception; 55 56 /* exceptions */ 57 #define EXINT 0 /* SIGINT received */ 58 #define EXERROR 1 /* a generic error */ 59 #define EXEXEC 2 /* command execution failed */ 60 #define EXEXIT 3 /* call exitshell(exitstatus) */ 61 62 63 /* 64 * These macros allow the user to suspend the handling of interrupt signals 65 * over a period of time. This is similar to SIGHOLD to or sigblock, but 66 * much more efficient and portable. (But hacking the kernel is so much 67 * more fun than worrying about efficiency and portability. :-)) 68 */ 69 70 extern volatile sig_atomic_t suppressint; 71 extern volatile sig_atomic_t intpending; 72 73 #define INTOFF suppressint++ 74 #define INTON { if (--suppressint == 0 && intpending) onint(); } 75 #define is_int_on() suppressint 76 #define SETINTON(s) suppressint = (s) 77 #define FORCEINTON {suppressint = 0; if (intpending) onint();} 78 #define CLEAR_PENDING_INT intpending = 0 79 #define int_pending() intpending 80 81 void exraise(int) __dead2; 82 void onint(void); 83 void warning(const char *, ...) __printflike(1, 2); 84 void error(const char *, ...) __printf0like(1, 2) __dead2; 85 void exerror(int, const char *, ...) __printf0like(2, 3) __dead2; 86 87 88 /* 89 * BSD setjmp saves the signal mask, which violates ANSI C and takes time, 90 * so we use _setjmp instead. 91 */ 92 93 #define setjmp(jmploc) _setjmp(jmploc) 94 #define longjmp(jmploc, val) _longjmp(jmploc, val) 95