xref: /original-bsd/local/toolchest/ksh/sh/brkincr.h (revision cdc4aa3b)
1 /*
2 
3  *      Copyright (c) 1984, 1985, 1986 AT&T
4  *      All Rights Reserved
5 
6  *      THIS IS UNPUBLISHED PROPRIETARY SOURCE
7  *      CODE OF AT&T.
8  *      The copyright notice above does not
9  *      evidence any actual or intended
10  *      publication of such source code.
11 
12  */
13 /* @(#)brkincr.h	1.1 */
14 /*
15  *	UNIX shell
16  *	S. R. Bourne
17  *	Rewritten by David Korn
18  *
19  */
20 
21 #if u370 || uts
22 #define BRKINCR		4096
23 #else
24 #define BRKINCR		((int)(0400*sizeof(char*)))
25 #endif	/* u370 */
26 #ifdef INT16
27 #define BRKMAX		((unsigned)(077777-BRKINCR))
28 #else
29 #define BRKMAX		(1024*BRKINCR)
30 #endif /* INT16 */
31 #define MINTRAP		0
32 #define MAXTRAP		NSIG+1
33 
34 #define SIGBITS		8
35 
36 #define SIGSLOW		1
37 #define SIGSET		4
38 #define SIGMOD		8
39 /*
40  * SIGNOSET means that signal not set unless mentioned explicitly
41  * SIGCAUGHT signals trap to fault, others to done
42  */
43 #define SIGCAUGHT	16
44 #define SIGNOSET	32
45 #define SIGIGNORE	64
46 #define	SIGJOBS		128
47 
48 #ifdef BSD
49 # ifdef BSD_4_2
50 #define	sighold(s)	sigblock(1<<((s)-1))
51 #define sigrelse(s)	sigsetmask(sigblock(0)&~(1<<((s)-1)))
52 # else
53 #define signal	sigset
54 # endif /* BSD_4_2 */
55 #else
56 #endif	/* BSD */
57 #define SIGFAIL		0200
58 #define SIGFLG		0200
59 #define TRAPSET		2
60 
61 
62 
63 
64 struct	blk		/* heap storage */
65 {
66 	BLKPTR		word;
67 };
68 
69 
70 extern char *brkbegin;
71 extern BLKPTR		blokp;			/*current search pointer*/
72 extern BLKPTR		bloktop;		/*top of arena (last blok)
73 						   initialized in addblok */
74 
75 extern jmp_buf	subshell;	/* jump here for subshell */
76 extern jmp_buf *freturn;	/* return pointer for functions or failure */
77 extern jmp_buf errshell;	/* return here on failures */
78