/*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Kenneth Almquist. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)error.h 8.2 (Berkeley) 5/4/95 * $FreeBSD$ */ /* * Types of operations (passed to the errmsg routine). */ #define E_OPEN 01 /* opening a file */ #define E_CREAT 02 /* creating a file */ #define E_EXEC 04 /* executing a program */ /* * We enclose jmp_buf in a structure so that we can declare pointers to * jump locations. The global variable handler contains the location to * jump to when an exception occurs, and the global variable exception * contains a code identifying the exception. To implement nested * exception handlers, the user should save the value of handler on entry * to an inner scope, set handler to point to a jmploc structure for the * inner scope, and restore handler on exit from the scope. */ #include <setjmp.h> #include <signal.h> struct jmploc { jmp_buf loc; }; extern struct jmploc *handler; extern volatile sig_atomic_t exception; /* exceptions */ #define EXINT 0 /* SIGINT received */ #define EXERROR 1 /* a generic error */ #define EXSHELLPROC 2 /* execute a shell procedure */ #define EXEXEC 3 /* command execution failed */ /* * These macros allow the user to suspend the handling of interrupt signals * over a period of time. This is similar to SIGHOLD to or sigblock, but * much more efficient and portable. (But hacking the kernel is so much * more fun than worrying about efficiency and portability. :-)) */ extern volatile sig_atomic_t suppressint; extern volatile sig_atomic_t intpending; #define INTOFF suppressint++ #define INTON { if (--suppressint == 0 && intpending) onint(); } #define FORCEINTON {suppressint = 0; if (intpending) onint();} #define CLEAR_PENDING_INT intpending = 0 #define int_pending() intpending void exraise(int); void onint(void); void error(const char *, ...) __printf0like(1, 2); void exerror(int, const char *, ...) __printf0like(2, 3); char *errmsg(int, int); /* * BSD setjmp saves the signal mask, which violates ANSI C and takes time, * so we use _setjmp instead. */ #ifdef BSD #define setjmp(jmploc) _setjmp(jmploc) #define longjmp(jmploc, val) _longjmp(jmploc, val) #endif