xref: /csrg-svn/bin/sh/error.h (revision 69272)
147111Sbostic /*-
260698Sbostic  * Copyright (c) 1991, 1993
360698Sbostic  *	The Regents of the University of California.  All rights reserved.
447111Sbostic  *
547111Sbostic  * This code is derived from software contributed to Berkeley by
647111Sbostic  * Kenneth Almquist.
747111Sbostic  *
847111Sbostic  * %sccs.include.redist.c%
947111Sbostic  *
10*69272Schristos  *	@(#)error.h	8.2 (Berkeley) 05/04/95
1147111Sbostic  */
1247111Sbostic 
1347111Sbostic /*
1447111Sbostic  * Types of operations (passed to the errmsg routine).
1547111Sbostic  */
1647111Sbostic 
1747111Sbostic #define E_OPEN 01	/* opening a file */
1847111Sbostic #define E_CREAT 02	/* creating a file */
1947111Sbostic #define E_EXEC 04	/* executing a program */
2047111Sbostic 
2147111Sbostic 
2247111Sbostic /*
2347111Sbostic  * We enclose jmp_buf in a structure so that we can declare pointers to
2447111Sbostic  * jump locations.  The global variable handler contains the location to
2547111Sbostic  * jump to when an exception occurs, and the global variable exception
2647111Sbostic  * contains a code identifying the exeception.  To implement nested
2747111Sbostic  * exception handlers, the user should save the value of handler on entry
2847111Sbostic  * to an inner scope, set handler to point to a jmploc structure for the
2947111Sbostic  * inner scope, and restore handler on exit from the scope.
3047111Sbostic  */
3147111Sbostic 
3247111Sbostic #include <setjmp.h>
3347111Sbostic 
3447111Sbostic struct jmploc {
3547111Sbostic 	jmp_buf loc;
3647111Sbostic };
3747111Sbostic 
3847111Sbostic extern struct jmploc *handler;
3947111Sbostic extern int exception;
4047111Sbostic 
4147111Sbostic /* exceptions */
4247111Sbostic #define EXINT 0		/* SIGINT received */
4347111Sbostic #define EXERROR 1	/* a generic error */
4447111Sbostic #define EXSHELLPROC 2	/* execute a shell procedure */
4547111Sbostic 
4647111Sbostic 
4747111Sbostic /*
4847111Sbostic  * These macros allow the user to suspend the handling of interrupt signals
4947111Sbostic  * over a period of time.  This is similar to SIGHOLD to or sigblock, but
5047111Sbostic  * much more efficient and portable.  (But hacking the kernel is so much
5147111Sbostic  * more fun than worrying about efficiency and portability. :-))
5247111Sbostic  */
5347111Sbostic 
5447111Sbostic extern volatile int suppressint;
5547111Sbostic extern volatile int intpending;
5647111Sbostic extern char *commandname;	/* name of command--printed on error */
5747111Sbostic 
5847111Sbostic #define INTOFF suppressint++
59*69272Schristos #define INTON { if (--suppressint == 0 && intpending) onint(); }
6047111Sbostic #define FORCEINTON {suppressint = 0; if (intpending) onint();}
6147111Sbostic #define CLEAR_PENDING_INT intpending = 0
6247111Sbostic #define int_pending() intpending
6347111Sbostic 
64*69272Schristos void exraise __P((int));
65*69272Schristos void onint __P((void));
66*69272Schristos void error2 __P((char *, char *));
67*69272Schristos void error __P((char *, ...));
68*69272Schristos char *errmsg __P((int, int));
6947111Sbostic 
7047111Sbostic 
7147111Sbostic /*
7247111Sbostic  * BSD setjmp saves the signal mask, which violates ANSI C and takes time,
7347111Sbostic  * so we use _setjmp instead.
7447111Sbostic  */
7547111Sbostic 
7647111Sbostic #ifdef BSD
7747111Sbostic #define setjmp(jmploc)	_setjmp(jmploc)
7847111Sbostic #define longjmp(jmploc, val)	_longjmp(jmploc, val)
7947111Sbostic #endif
80