1 /*
2  * Definitions used in the interpreter
3  */
4 extern void Xappend(void), Xasync(void), Xbackq(void), Xbang(void), Xclose(void);
5 extern void Xconc(void), Xcount(void), Xdelfn(void), Xdol(void), Xqdol(void), Xdup(void);
6 extern void Xexit(void), Xfalse(void), Xfn(void), Xfor(void), Xglob(void);
7 extern void Xjump(void), Xmark(void), Xmatch(void), Xpipe(void), Xread(void);
8 extern void Xrdfn(void), Xunredir(void), Xstar(void), Xreturn(void), Xsubshell(void);
9 extern void Xtrue(void), Xword(void), Xwrite(void), Xpipefd(void), Xcase(void);
10 extern void Xlocal(void), Xunlocal(void), Xassign(void), Xsimple(void), Xpopm(void);
11 extern void Xrdcmds(void), Xwastrue(void), Xif(void), Xifnot(void), Xpipewait(void);
12 extern void Xdelhere(void), Xpopredir(void), Xsub(void), Xeflag(void), Xsettrue(void);
13 extern void Xerror(char*);
14 extern void Xerror1(char*);
15 /*
16  * word lists are in correct order,
17  * i.e. word0->word1->word2->word3->0
18  */
19 struct word{
20 	char *word;
21 	word *next;
22 };
23 struct list{
24 	word *words;
25 	list *next;
26 };
27 word *newword(char *, word *), *copywords(word *, word *);
28 struct redir{
29 	char type;			/* what to do */
30 	short from, to;			/* what to do it to */
31 	struct redir *next;		/* what else to do (reverse order) */
32 };
33 #define	NSTATUS	ERRMAX			/* length of status (from plan 9) */
34 /*
35  * redir types
36  */
37 #define	ROPEN	1			/* dup2(from, to); close(from); */
38 #define	RDUP	2			/* dup2(from, to); */
39 #define	RCLOSE	3			/* close(from); */
40 struct thread{
41 	union code *code;		/* code for this thread */
42 	int pc;				/* code[pc] is the next instruction */
43 	struct list *argv;		/* argument stack */
44 	struct redir *redir;		/* redirection stack */
45 	struct redir *startredir;	/* redir inheritance point */
46 	struct var *local;		/* list of local variables */
47 	char *cmdfile;			/* file name in Xrdcmd */
48 	struct io *cmdfd;		/* file descriptor for Xrdcmd */
49 	int iflast;			/* static `if not' checking */
50 	int eof;			/* is cmdfd at eof? */
51 	int iflag;			/* interactive? */
52 	int lineno;			/* linenumber */
53 	int pid;			/* process for Xpipewait to wait for */
54 	int done;			/* have we seen a wait message for this process? */
55 	char status[NSTATUS];		/* status for Xpipewait */
56 	tree *treenodes;		/* tree nodes created by this process */
57 	thread *ret;		/* who continues when this finishes */
58 };
59 thread *runq;
60 code *codecopy(code*);
61 code *codebuf;				/* compiler output */
62 int ntrap;				/* number of outstanding traps */
63 int trap[NSIG];				/* number of outstanding traps per type */
64 extern struct builtin{
65 	char *name;
66 	void (*fnc)(void);
67 }Builtin[];
68 int eflagok;			/* kludge flag so that -e doesn't exit in startup */
69 void execcd(void), execwhatis(void), execeval(void), execexec(void);
70 void execexit(void), execshift(void);
71 void execwait(void), execumask(void), execdot(void), execflag(void);
72 void execfunc(var*), execcmds(io *);