| 1 | /*- |
| 2 | * Copyright (c) 1991 The Regents of the University of California. |
| 3 | * 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 5.1 (Berkeley) %G% |
| 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(); else |
| 60 | #define FORCEINTON {suppressint = 0; if (intpending) onint();} |
| 61 | #define CLEAR_PENDING_INT intpending = 0 |
| 62 | #define int_pending() intpending |
| 63 | |
| 64 | #ifdef __STDC__ |
| 65 | void exraise(int); |
| 66 | void onint(void); |
| 67 | void error2(char *, char *); |
| 68 | void error(char *, ...); |
| 69 | char *errmsg(int, int); |
| 70 | #else |
| 71 | void exraise(); |
| 72 | void onint(); |
| 73 | void error2(); |
| 74 | void error(); |
| 75 | char *errmsg(); |
| 76 | #endif |
| 77 | |
| 78 | |
| 79 | /* |
| 80 | * BSD setjmp saves the signal mask, which violates ANSI C and takes time, |
| 81 | * so we use _setjmp instead. |
| 82 | */ |
| 83 | |
| 84 | #ifdef BSD |
| 85 | #define setjmp(jmploc) _setjmp(jmploc) |
| 86 | #define longjmp(jmploc, val) _longjmp(jmploc, val) |
| 87 | #endif |