11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 4. Neither the name of the University nor the names of its contributors 171556Srgrimes * may be used to endorse or promote products derived from this software 181556Srgrimes * without specific prior written permission. 191556Srgrimes * 201556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301556Srgrimes * SUCH DAMAGE. 311556Srgrimes * 3217987Speter * @(#)error.h 8.2 (Berkeley) 5/4/95 3350471Speter * $FreeBSD$ 341556Srgrimes */ 351556Srgrimes 361556Srgrimes/* 371556Srgrimes * We enclose jmp_buf in a structure so that we can declare pointers to 381556Srgrimes * jump locations. The global variable handler contains the location to 391556Srgrimes * jump to when an exception occurs, and the global variable exception 4046684Skris * contains a code identifying the exception. To implement nested 411556Srgrimes * exception handlers, the user should save the value of handler on entry 421556Srgrimes * to an inner scope, set handler to point to a jmploc structure for the 431556Srgrimes * inner scope, and restore handler on exit from the scope. 441556Srgrimes */ 451556Srgrimes 461556Srgrimes#include <setjmp.h> 4738521Scracauer#include <signal.h> 481556Srgrimes 491556Srgrimesstruct jmploc { 501556Srgrimes jmp_buf loc; 511556Srgrimes}; 521556Srgrimes 531556Srgrimesextern struct jmploc *handler; 5438530Scracauerextern volatile sig_atomic_t exception; 551556Srgrimes 561556Srgrimes/* exceptions */ 571556Srgrimes#define EXINT 0 /* SIGINT received */ 581556Srgrimes#define EXERROR 1 /* a generic error */ 59218306Sjilles#define EXEXEC 2 /* command execution failed */ 60220978Sjilles#define EXEXIT 3 /* call exitshell(exitstatus) */ 611556Srgrimes 621556Srgrimes 631556Srgrimes/* 641556Srgrimes * These macros allow the user to suspend the handling of interrupt signals 651556Srgrimes * over a period of time. This is similar to SIGHOLD to or sigblock, but 661556Srgrimes * much more efficient and portable. (But hacking the kernel is so much 671556Srgrimes * more fun than worrying about efficiency and portability. :-)) 681556Srgrimes */ 691556Srgrimes 7038521Scracauerextern volatile sig_atomic_t suppressint; 7138521Scracauerextern volatile sig_atomic_t intpending; 721556Srgrimes 731556Srgrimes#define INTOFF suppressint++ 7417987Speter#define INTON { if (--suppressint == 0 && intpending) onint(); } 75199660Sjilles#define is_int_on() suppressint 76199660Sjilles#define SETINTON(s) suppressint = (s) 771556Srgrimes#define FORCEINTON {suppressint = 0; if (intpending) onint();} 781556Srgrimes#define CLEAR_PENDING_INT intpending = 0 791556Srgrimes#define int_pending() intpending 801556Srgrimes 81200967Sjillesvoid exraise(int) __dead2; 8290111Simpvoid onint(void); 83216622Sjillesvoid warning(const char *, ...) __printflike(1, 2); 84200967Sjillesvoid error(const char *, ...) __printf0like(1, 2) __dead2; 85200967Sjillesvoid exerror(int, const char *, ...) __printf0like(2, 3) __dead2; 861556Srgrimes 871556Srgrimes 881556Srgrimes/* 891556Srgrimes * BSD setjmp saves the signal mask, which violates ANSI C and takes time, 901556Srgrimes * so we use _setjmp instead. 911556Srgrimes */ 921556Srgrimes 931556Srgrimes#define setjmp(jmploc) _setjmp(jmploc) 941556Srgrimes#define longjmp(jmploc, val) _longjmp(jmploc, val) 95