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 * %sccs.include.redist.c% 9 * 10 * @(#)error.h 8.2 (Berkeley) 05/04/95 11 */ 12 13 /* 14 * Types of operations (passed to the errmsg routine). 15 */ 16 17 #define E_OPEN 01 /* opening a file */ 18 #define E_CREAT 02 /* creating a file */ 19 #define E_EXEC 04 /* executing a program */ 20 21 22 /* 23 * We enclose jmp_buf in a structure so that we can declare pointers to 24 * jump locations. The global variable handler contains the location to 25 * jump to when an exception occurs, and the global variable exception 26 * contains a code identifying the exeception. To implement nested 27 * exception handlers, the user should save the value of handler on entry 28 * to an inner scope, set handler to point to a jmploc structure for the 29 * inner scope, and restore handler on exit from the scope. 30 */ 31 32 #include <setjmp.h> 33 34 struct jmploc { 35 jmp_buf loc; 36 }; 37 38 extern struct jmploc *handler; 39 extern int exception; 40 41 /* exceptions */ 42 #define EXINT 0 /* SIGINT received */ 43 #define EXERROR 1 /* a generic error */ 44 #define EXSHELLPROC 2 /* execute a shell procedure */ 45 46 47 /* 48 * These macros allow the user to suspend the handling of interrupt signals 49 * over a period of time. This is similar to SIGHOLD to or sigblock, but 50 * much more efficient and portable. (But hacking the kernel is so much 51 * more fun than worrying about efficiency and portability. :-)) 52 */ 53 54 extern volatile int suppressint; 55 extern volatile int intpending; 56 extern char *commandname; /* name of command--printed on error */ 57 58 #define INTOFF suppressint++ 59 #define INTON { if (--suppressint == 0 && intpending) onint(); } 60 #define FORCEINTON {suppressint = 0; if (intpending) onint();} 61 #define CLEAR_PENDING_INT intpending = 0 62 #define int_pending() intpending 63 64 void exraise __P((int)); 65 void onint __P((void)); 66 void error2 __P((char *, char *)); 67 void error __P((char *, ...)); 68 char *errmsg __P((int, int)); 69 70 71 /* 72 * BSD setjmp saves the signal mask, which violates ANSI C and takes time, 73 * so we use _setjmp instead. 74 */ 75 76 #ifdef BSD 77 #define setjmp(jmploc) _setjmp(jmploc) 78 #define longjmp(jmploc, val) _longjmp(jmploc, val) 79 #endif 80