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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 | |
6f96c1c5 | 18 | static char sccsid[] = "@(#)main.c 5.4 (Berkeley) %G%"; |
6c5bf7b4 KB |
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" | |
6c5bf7b4 | 34 | #include "var.h" |
6c5bf7b4 KB |
35 | #include "memalloc.h" |
36 | #include "error.h" | |
37 | #include "init.h" | |
38 | #include "mystring.h" | |
39 | ||
40 | #define PROFILE 0 | |
41 | ||
42 | int rootpid; | |
43 | int rootshell; | |
44 | STATIC union node *curcmd; | |
45 | STATIC union node *prevcmd; | |
46 | extern int errno; | |
47 | #if PROFILE | |
48 | short profile_buf[16384]; | |
49 | extern int etext(); | |
50 | #endif | |
51 | ||
52 | #ifdef __STDC__ | |
53 | STATIC void read_profile(char *); | |
54 | char *getenv(char *); | |
55 | #else | |
56 | STATIC void read_profile(); | |
57 | char *getenv(); | |
58 | #endif | |
59 | ||
60 | ||
61 | /* | |
62 | * Main routine. We initialize things, parse the arguments, execute | |
63 | * profiles if we're a login shell, and then call cmdloop to execute | |
64 | * commands. The setjmp call sets up the location to jump to when an | |
65 | * exception occurs. When an exception occurs the variable "state" | |
66 | * is used to figure out how far we had gotten. | |
67 | */ | |
68 | ||
69 | main(argc, argv) char **argv; { | |
70 | struct jmploc jmploc; | |
71 | struct stackmark smark; | |
72 | volatile int state; | |
73 | char *shinit; | |
74 | ||
75 | #if PROFILE | |
76 | monitor(4, etext, profile_buf, sizeof profile_buf, 50); | |
77 | #endif | |
78 | state = 0; | |
79 | if (setjmp(jmploc.loc)) { | |
80 | /* | |
81 | * When a shell procedure is executed, we raise the | |
82 | * exception EXSHELLPROC to clean up before executing | |
83 | * the shell procedure. | |
84 | */ | |
85 | if (exception == EXSHELLPROC) { | |
86 | rootpid = getpid(); | |
87 | rootshell = 1; | |
88 | minusc = NULL; | |
89 | state = 3; | |
90 | } else if (state == 0 || iflag == 0 || ! rootshell) | |
91 | exitshell(2); | |
92 | reset(); | |
93 | #if ATTY | |
94 | if (exception == EXINT | |
95 | && (! attyset() || equal(termval(), "emacs"))) { | |
96 | #else | |
97 | if (exception == EXINT) { | |
98 | #endif | |
99 | out2c('\n'); | |
100 | flushout(&errout); | |
101 | } | |
102 | popstackmark(&smark); | |
103 | FORCEINTON; /* enable interrupts */ | |
104 | if (state == 1) | |
105 | goto state1; | |
106 | else if (state == 2) | |
107 | goto state2; | |
efcbb576 | 108 | else if (state == 3) |
6c5bf7b4 | 109 | goto state3; |
efcbb576 MT |
110 | else |
111 | goto state4; | |
6c5bf7b4 KB |
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"); | |
efcbb576 | 129 | } |
6c5bf7b4 KB |
130 | state2: |
131 | state = 3; | |
efcbb576 MT |
132 | if ((sflag || minusc) && (shinit = lookupvar("ENV")) != NULL && |
133 | *shinit != '\0') { | |
134 | state = 3; | |
135 | read_profile(shinit); | |
136 | } | |
137 | state3: | |
138 | state = 4; | |
6c5bf7b4 KB |
139 | if (minusc) { |
140 | evalstring(minusc); | |
141 | } | |
142 | if (sflag || minusc == NULL) { | |
efcbb576 | 143 | state4: /* XXX ??? - why isn't this before the "if" statement */ |
6c5bf7b4 KB |
144 | cmdloop(1); |
145 | } | |
146 | #if PROFILE | |
147 | monitor(0); | |
148 | #endif | |
149 | exitshell(exitstatus); | |
150 | } | |
151 | ||
152 | ||
153 | /* | |
154 | * Read and execute commands. "Top" is nonzero for the top level command | |
155 | * loop; it turns on prompting if the shell is interactive. | |
156 | */ | |
157 | ||
158 | void | |
159 | cmdloop(top) { | |
160 | union node *n; | |
161 | struct stackmark smark; | |
162 | int inter; | |
163 | int numeof; | |
164 | ||
165 | TRACE(("cmdloop(%d) called\n", top)); | |
166 | setstackmark(&smark); | |
167 | numeof = 0; | |
168 | for (;;) { | |
169 | if (pendingsigs) | |
170 | dotrap(); | |
171 | inter = 0; | |
172 | if (iflag && top) { | |
173 | inter++; | |
174 | showjobs(1); | |
175 | chkmail(0); | |
176 | flushout(&output); | |
177 | } | |
178 | n = parsecmd(inter); | |
179 | #ifdef DEBUG | |
ddba57cd | 180 | /* showtree(n); */ |
6c5bf7b4 KB |
181 | #endif |
182 | if (n == NEOF) { | |
efcbb576 | 183 | if (Iflag == 0 || !top || numeof >= 50) |
6c5bf7b4 KB |
184 | break; |
185 | out2str("\nUse \"exit\" to leave shell.\n"); | |
186 | numeof++; | |
187 | } else if (n != NULL && nflag == 0) { | |
188 | if (inter) { | |
189 | INTOFF; | |
190 | if (prevcmd) | |
191 | freefunc(prevcmd); | |
192 | prevcmd = curcmd; | |
193 | curcmd = copyfunc(n); | |
194 | INTON; | |
195 | } | |
196 | evaltree(n, 0); | |
197 | #ifdef notdef | |
198 | if (exitstatus) /*DEBUG*/ | |
199 | outfmt(&errout, "Exit status 0x%X\n", exitstatus); | |
200 | #endif | |
201 | } | |
202 | popstackmark(&smark); | |
203 | } | |
204 | popstackmark(&smark); /* unnecessary */ | |
205 | } | |
206 | ||
207 | ||
208 | ||
209 | /* | |
210 | * Read /etc/profile or .profile. Return on error. | |
211 | */ | |
212 | ||
213 | STATIC void | |
214 | read_profile(name) | |
215 | char *name; | |
216 | { | |
217 | int fd; | |
218 | ||
219 | INTOFF; | |
220 | if ((fd = open(name, O_RDONLY)) >= 0) | |
221 | setinputfd(fd, 1); | |
222 | INTON; | |
223 | if (fd < 0) | |
224 | return; | |
225 | cmdloop(0); | |
226 | popfile(); | |
227 | } | |
228 | ||
229 | ||
230 | ||
231 | /* | |
232 | * Read a file containing shell functions. | |
233 | */ | |
234 | ||
235 | void | |
236 | readcmdfile(name) | |
237 | char *name; | |
238 | { | |
239 | int fd; | |
240 | ||
241 | INTOFF; | |
242 | if ((fd = open(name, O_RDONLY)) >= 0) | |
243 | setinputfd(fd, 1); | |
244 | else | |
245 | error("Can't open %s", name); | |
246 | INTON; | |
247 | cmdloop(0); | |
248 | popfile(); | |
249 | } | |
250 | ||
251 | ||
252 | ||
253 | /* | |
254 | * Take commands from a file. To be compatable we should do a path | |
255 | * search for the file, but a path search doesn't make any sense. | |
256 | */ | |
257 | ||
258 | dotcmd(argc, argv) char **argv; { | |
259 | exitstatus = 0; | |
260 | if (argc >= 2) { /* That's what SVR2 does */ | |
261 | setinputfile(argv[1], 1); | |
262 | commandname = argv[1]; | |
263 | cmdloop(0); | |
264 | popfile(); | |
265 | } | |
266 | return exitstatus; | |
267 | } | |
268 | ||
269 | ||
270 | exitcmd(argc, argv) char **argv; { | |
271 | if (argc > 1) | |
272 | exitstatus = number(argv[1]); | |
273 | exitshell(exitstatus); | |
274 | } | |
275 | ||
276 | ||
277 | lccmd(argc, argv) char **argv; { | |
278 | if (argc > 1) { | |
279 | defun(argv[1], prevcmd); | |
280 | return 0; | |
281 | } else { | |
282 | INTOFF; | |
283 | freefunc(curcmd); | |
284 | curcmd = prevcmd; | |
285 | prevcmd = NULL; | |
286 | INTON; | |
287 | evaltree(curcmd, 0); | |
288 | return exitstatus; | |
289 | } | |
290 | } | |
291 | ||
292 | ||
293 | ||
294 | #ifdef notdef | |
295 | /* | |
296 | * Should never be called. | |
297 | */ | |
298 | ||
299 | void | |
300 | exit(exitstatus) { | |
301 | _exit(exitstatus); | |
302 | } | |
303 | #endif |