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 Xrdwr(void);
9 extern void Xrdfn(void), Xunredir(void), Xstar(void), Xreturn(void), Xsubshell(void);
10 extern void Xtrue(void), Xword(void), Xwrite(void), Xpipefd(void), Xcase(void);
11 extern void Xlocal(void), Xunlocal(void), Xassign(void), Xsimple(void), Xpopm(void);
12 extern void Xrdcmds(void), Xwastrue(void), Xif(void), Xifnot(void), Xpipewait(void);
13 extern void Xdelhere(void), Xpopredir(void), Xsub(void), Xeflag(void), Xsettrue(void);
14 extern void Xerror(char*);
15 extern void Xerror1(char*);
16 /*
17  * word lists are in correct order,
18  * i.e. word0->word1->word2->word3->0
19  */
20 struct word{
21 	char *word;
22 	word *next;
23 };
24 struct list{
25 	word *words;
26 	list *next;
27 };
28 word *newword(char *, word *), *copywords(word *, word *);
29 struct redir{
30 	char type;			/* what to do */
31 	short from, to;			/* what to do it to */
32 	struct redir *next;		/* what else to do (reverse order) */
33 };
34 #define	NSTATUS	ERRMAX			/* length of status (from plan 9) */
35 /*
36  * redir types
37  */
38 #define	ROPEN	1			/* dup2(from, to); close(from); */
39 #define	RDUP	2			/* dup2(from, to); */
40 #define	RCLOSE	3			/* close(from); */
41 struct thread{
42 	union code *code;		/* code for this thread */
43 	int pc;				/* code[pc] is the next instruction */
44 	struct list *argv;		/* argument stack */
45 	struct redir *redir;		/* redirection stack */
46 	struct redir *startredir;	/* redir inheritance point */
47 	struct var *local;		/* list of local variables */
48 	char *cmdfile;			/* file name in Xrdcmd */
49 	struct io *cmdfd;		/* file descriptor for Xrdcmd */
50 	int iflast;			/* static `if not' checking */
51 	int eof;			/* is cmdfd at eof? */
52 	int iflag;			/* interactive? */
53 	int lineno;			/* linenumber */
54 	int pid;			/* process for Xpipewait to wait for */
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 struct builtin{
65 	char *name;
66 	void (*fnc)(void);
67 };
68 extern struct builtin Builtin[];
69 int eflagok;			/* kludge flag so that -e doesn't exit in startup */
70 extern int havefork;
71 
72 void execcd(void), execwhatis(void), execeval(void), execexec(void);
73 int execforkexec(void);
74 void execexit(void), execshift(void);
75 void execwait(void), execumask(void), execdot(void), execflag(void);
76 void execfunc(var*), execcmds(io *);