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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 | ||
11 | #ifndef lint | |
12 | char copyright[] = | |
13 | "@(#) Copyright (c) 1991 The Regents of the University of California.\n\ | |
14 | All rights reserved.\n"; | |
15 | #endif /* not lint */ | |
16 | ||
17 | #ifndef lint | |
18 | static char sccsid[] = "@(#)main.c 5.1 (Berkeley) %G%"; | |
19 | #endif /* not lint */ | |
20 | ||
21 | #include <signal.h> | |
22 | #include <fcntl.h> | |
23 | #include "shell.h" | |
24 | #include "main.h" | |
25 | #include "mail.h" | |
26 | #include "options.h" | |
27 | #include "output.h" | |
28 | #include "parser.h" | |
29 | #include "nodes.h" | |
30 | #include "eval.h" | |
31 | #include "jobs.h" | |
32 | #include "input.h" | |
33 | #include "trap.h" | |
34 | #if ATTY | |
35 | #include "var.h" | |
36 | #endif | |
37 | #include "memalloc.h" | |
38 | #include "error.h" | |
39 | #include "init.h" | |
40 | #include "mystring.h" | |
41 | ||
42 | #define PROFILE 0 | |
43 | ||
44 | int rootpid; | |
45 | int rootshell; | |
46 | STATIC union node *curcmd; | |
47 | STATIC union node *prevcmd; | |
48 | extern int errno; | |
49 | #if PROFILE | |
50 | short profile_buf[16384]; | |
51 | extern int etext(); | |
52 | #endif | |
53 | ||
54 | #ifdef __STDC__ | |
55 | STATIC void read_profile(char *); | |
56 | char *getenv(char *); | |
57 | #else | |
58 | STATIC void read_profile(); | |
59 | char *getenv(); | |
60 | #endif | |
61 | ||
62 | ||
63 | /* | |
64 | * Main routine. We initialize things, parse the arguments, execute | |
65 | * profiles if we're a login shell, and then call cmdloop to execute | |
66 | * commands. The setjmp call sets up the location to jump to when an | |
67 | * exception occurs. When an exception occurs the variable "state" | |
68 | * is used to figure out how far we had gotten. | |
69 | */ | |
70 | ||
71 | main(argc, argv) char **argv; { | |
72 | struct jmploc jmploc; | |
73 | struct stackmark smark; | |
74 | volatile int state; | |
75 | char *shinit; | |
76 | ||
77 | #if PROFILE | |
78 | monitor(4, etext, profile_buf, sizeof profile_buf, 50); | |
79 | #endif | |
80 | state = 0; | |
81 | if (setjmp(jmploc.loc)) { | |
82 | /* | |
83 | * When a shell procedure is executed, we raise the | |
84 | * exception EXSHELLPROC to clean up before executing | |
85 | * the shell procedure. | |
86 | */ | |
87 | if (exception == EXSHELLPROC) { | |
88 | rootpid = getpid(); | |
89 | rootshell = 1; | |
90 | minusc = NULL; | |
91 | state = 3; | |
92 | } else if (state == 0 || iflag == 0 || ! rootshell) | |
93 | exitshell(2); | |
94 | reset(); | |
95 | #if ATTY | |
96 | if (exception == EXINT | |
97 | && (! attyset() || equal(termval(), "emacs"))) { | |
98 | #else | |
99 | if (exception == EXINT) { | |
100 | #endif | |
101 | out2c('\n'); | |
102 | flushout(&errout); | |
103 | } | |
104 | popstackmark(&smark); | |
105 | FORCEINTON; /* enable interrupts */ | |
106 | if (state == 1) | |
107 | goto state1; | |
108 | else if (state == 2) | |
109 | goto state2; | |
110 | else | |
111 | goto state3; | |
112 | } | |
113 | handler = &jmploc; | |
114 | #ifdef DEBUG | |
115 | opentrace(); | |
116 | trputs("Shell args: "); trargs(argv); | |
117 | #endif | |
118 | rootpid = getpid(); | |
119 | rootshell = 1; | |
120 | init(); | |
121 | setstackmark(&smark); | |
122 | procargs(argc, argv); | |
123 | if (argv[0] && argv[0][0] == '-') { | |
124 | state = 1; | |
125 | read_profile("/etc/profile"); | |
126 | state1: | |
127 | state = 2; | |
128 | read_profile(".profile"); | |
129 | } else if ((sflag || minusc) && (shinit = getenv("SHINIT")) != NULL) { | |
130 | state = 2; | |
131 | evalstring(shinit); | |
132 | } | |
133 | state2: | |
134 | state = 3; | |
135 | if (minusc) { | |
136 | evalstring(minusc); | |
137 | } | |
138 | if (sflag || minusc == NULL) { | |
139 | state3: | |
140 | cmdloop(1); | |
141 | } | |
142 | #if PROFILE | |
143 | monitor(0); | |
144 | #endif | |
145 | exitshell(exitstatus); | |
146 | } | |
147 | ||
148 | ||
149 | /* | |
150 | * Read and execute commands. "Top" is nonzero for the top level command | |
151 | * loop; it turns on prompting if the shell is interactive. | |
152 | */ | |
153 | ||
154 | void | |
155 | cmdloop(top) { | |
156 | union node *n; | |
157 | struct stackmark smark; | |
158 | int inter; | |
159 | int numeof; | |
160 | ||
161 | TRACE(("cmdloop(%d) called\n", top)); | |
162 | setstackmark(&smark); | |
163 | numeof = 0; | |
164 | for (;;) { | |
165 | if (pendingsigs) | |
166 | dotrap(); | |
167 | inter = 0; | |
168 | if (iflag && top) { | |
169 | inter++; | |
170 | showjobs(1); | |
171 | chkmail(0); | |
172 | flushout(&output); | |
173 | } | |
174 | n = parsecmd(inter); | |
175 | #ifdef DEBUG | |
176 | /* BROKEN - FIX showtree(n); */ | |
177 | #endif | |
178 | if (n == NEOF) { | |
179 | if (Iflag == 0 || numeof >= 50) | |
180 | break; | |
181 | out2str("\nUse \"exit\" to leave shell.\n"); | |
182 | numeof++; | |
183 | } else if (n != NULL && nflag == 0) { | |
184 | if (inter) { | |
185 | INTOFF; | |
186 | if (prevcmd) | |
187 | freefunc(prevcmd); | |
188 | prevcmd = curcmd; | |
189 | curcmd = copyfunc(n); | |
190 | INTON; | |
191 | } | |
192 | evaltree(n, 0); | |
193 | #ifdef notdef | |
194 | if (exitstatus) /*DEBUG*/ | |
195 | outfmt(&errout, "Exit status 0x%X\n", exitstatus); | |
196 | #endif | |
197 | } | |
198 | popstackmark(&smark); | |
199 | } | |
200 | popstackmark(&smark); /* unnecessary */ | |
201 | } | |
202 | ||
203 | ||
204 | ||
205 | /* | |
206 | * Read /etc/profile or .profile. Return on error. | |
207 | */ | |
208 | ||
209 | STATIC void | |
210 | read_profile(name) | |
211 | char *name; | |
212 | { | |
213 | int fd; | |
214 | ||
215 | INTOFF; | |
216 | if ((fd = open(name, O_RDONLY)) >= 0) | |
217 | setinputfd(fd, 1); | |
218 | INTON; | |
219 | if (fd < 0) | |
220 | return; | |
221 | cmdloop(0); | |
222 | popfile(); | |
223 | } | |
224 | ||
225 | ||
226 | ||
227 | /* | |
228 | * Read a file containing shell functions. | |
229 | */ | |
230 | ||
231 | void | |
232 | readcmdfile(name) | |
233 | char *name; | |
234 | { | |
235 | int fd; | |
236 | ||
237 | INTOFF; | |
238 | if ((fd = open(name, O_RDONLY)) >= 0) | |
239 | setinputfd(fd, 1); | |
240 | else | |
241 | error("Can't open %s", name); | |
242 | INTON; | |
243 | cmdloop(0); | |
244 | popfile(); | |
245 | } | |
246 | ||
247 | ||
248 | ||
249 | /* | |
250 | * Take commands from a file. To be compatable we should do a path | |
251 | * search for the file, but a path search doesn't make any sense. | |
252 | */ | |
253 | ||
254 | dotcmd(argc, argv) char **argv; { | |
255 | exitstatus = 0; | |
256 | if (argc >= 2) { /* That's what SVR2 does */ | |
257 | setinputfile(argv[1], 1); | |
258 | commandname = argv[1]; | |
259 | cmdloop(0); | |
260 | popfile(); | |
261 | } | |
262 | return exitstatus; | |
263 | } | |
264 | ||
265 | ||
266 | exitcmd(argc, argv) char **argv; { | |
267 | if (argc > 1) | |
268 | exitstatus = number(argv[1]); | |
269 | exitshell(exitstatus); | |
270 | } | |
271 | ||
272 | ||
273 | lccmd(argc, argv) char **argv; { | |
274 | if (argc > 1) { | |
275 | defun(argv[1], prevcmd); | |
276 | return 0; | |
277 | } else { | |
278 | INTOFF; | |
279 | freefunc(curcmd); | |
280 | curcmd = prevcmd; | |
281 | prevcmd = NULL; | |
282 | INTON; | |
283 | evaltree(curcmd, 0); | |
284 | return exitstatus; | |
285 | } | |
286 | } | |
287 | ||
288 | ||
289 | ||
290 | #ifdef notdef | |
291 | /* | |
292 | * Should never be called. | |
293 | */ | |
294 | ||
295 | void | |
296 | exit(exitstatus) { | |
297 | _exit(exitstatus); | |
298 | } | |
299 | #endif |