projects / unix-history / blame
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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 |