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15637ed4 RG |
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 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. All advertising materials mentioning features or use of this software | |
17 | * must display the following acknowledgement: | |
18 | * This product includes software developed by the University of | |
19 | * California, Berkeley and its contributors. | |
20 | * 4. Neither the name of the University nor the names of its contributors | |
21 | * may be used to endorse or promote products derived from this software | |
22 | * without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
34 | * SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #ifndef lint | |
38 | char copyright[] = | |
39 | "@(#) Copyright (c) 1991 The Regents of the University of California.\n\ | |
40 | All rights reserved.\n"; | |
41 | #endif /* not lint */ | |
42 | ||
43 | #ifndef lint | |
44 | static char sccsid[] = "@(#)main.c 5.2 (Berkeley) 3/13/91"; | |
45 | #endif /* not lint */ | |
46 | ||
47 | #include <signal.h> | |
48 | #include <fcntl.h> | |
49 | #include "shell.h" | |
50 | #include "main.h" | |
51 | #include "mail.h" | |
52 | #include "options.h" | |
53 | #include "output.h" | |
54 | #include "parser.h" | |
55 | #include "nodes.h" | |
56 | #include "eval.h" | |
57 | #include "jobs.h" | |
58 | #include "input.h" | |
59 | #include "trap.h" | |
60 | #if ATTY | |
61 | #include "var.h" | |
62 | #endif | |
63 | #include "memalloc.h" | |
64 | #include "error.h" | |
65 | #include "init.h" | |
66 | #include "mystring.h" | |
67 | ||
68 | #define PROFILE 0 | |
69 | ||
70 | int rootpid; | |
71 | int rootshell; | |
72 | STATIC union node *curcmd; | |
73 | STATIC union node *prevcmd; | |
74 | extern int errno; | |
75 | #if PROFILE | |
76 | short profile_buf[16384]; | |
77 | extern int etext(); | |
78 | #endif | |
79 | ||
80 | #ifdef __STDC__ | |
81 | STATIC void read_profile(char *); | |
82 | char *getenv(char *); | |
83 | #else | |
84 | STATIC void read_profile(); | |
85 | char *getenv(); | |
86 | #endif | |
87 | ||
88 | ||
89 | /* | |
90 | * Main routine. We initialize things, parse the arguments, execute | |
91 | * profiles if we're a login shell, and then call cmdloop to execute | |
92 | * commands. The setjmp call sets up the location to jump to when an | |
93 | * exception occurs. When an exception occurs the variable "state" | |
94 | * is used to figure out how far we had gotten. | |
95 | */ | |
96 | ||
97 | main(argc, argv) char **argv; { | |
98 | struct jmploc jmploc; | |
99 | struct stackmark smark; | |
100 | volatile int state; | |
101 | char *shinit; | |
102 | ||
103 | #if PROFILE | |
104 | monitor(4, etext, profile_buf, sizeof profile_buf, 50); | |
105 | #endif | |
106 | state = 0; | |
107 | if (setjmp(jmploc.loc)) { | |
108 | /* | |
109 | * When a shell procedure is executed, we raise the | |
110 | * exception EXSHELLPROC to clean up before executing | |
111 | * the shell procedure. | |
112 | */ | |
113 | if (exception == EXSHELLPROC) { | |
114 | rootpid = getpid(); | |
115 | rootshell = 1; | |
116 | minusc = NULL; | |
117 | state = 3; | |
118 | } else if (state == 0 || iflag == 0 || ! rootshell) | |
119 | exitshell(2); | |
120 | reset(); | |
121 | #if ATTY | |
122 | if (exception == EXINT | |
123 | && (! attyset() || equal(termval(), "emacs"))) { | |
124 | #else | |
125 | if (exception == EXINT) { | |
126 | #endif | |
127 | out2c('\n'); | |
128 | flushout(&errout); | |
129 | } | |
130 | popstackmark(&smark); | |
131 | FORCEINTON; /* enable interrupts */ | |
132 | if (state == 1) | |
133 | goto state1; | |
134 | else if (state == 2) | |
135 | goto state2; | |
136 | else | |
137 | goto state3; | |
138 | } | |
139 | handler = &jmploc; | |
140 | #ifdef DEBUG | |
141 | opentrace(); | |
142 | trputs("Shell args: "); trargs(argv); | |
143 | #endif | |
144 | rootpid = getpid(); | |
145 | rootshell = 1; | |
146 | init(); | |
147 | setstackmark(&smark); | |
148 | procargs(argc, argv); | |
149 | if (argv[0] && argv[0][0] == '-') { | |
150 | state = 1; | |
151 | read_profile("/etc/profile"); | |
152 | state1: | |
153 | state = 2; | |
154 | read_profile(".profile"); | |
155 | } else if ((sflag || minusc) && (shinit = getenv("SHINIT")) != NULL) { | |
156 | state = 2; | |
157 | evalstring(shinit); | |
158 | } | |
159 | state2: | |
160 | state = 3; | |
161 | if (minusc) { | |
162 | evalstring(minusc); | |
163 | } | |
164 | if (sflag || minusc == NULL) { | |
165 | state3: | |
166 | cmdloop(1); | |
167 | } | |
168 | #if PROFILE | |
169 | monitor(0); | |
170 | #endif | |
171 | exitshell(exitstatus); | |
172 | } | |
173 | ||
174 | ||
175 | /* | |
176 | * Read and execute commands. "Top" is nonzero for the top level command | |
177 | * loop; it turns on prompting if the shell is interactive. | |
178 | */ | |
179 | ||
180 | void | |
181 | cmdloop(top) { | |
182 | union node *n; | |
183 | struct stackmark smark; | |
184 | int inter; | |
185 | int numeof; | |
186 | ||
187 | TRACE(("cmdloop(%d) called\n", top)); | |
188 | setstackmark(&smark); | |
189 | numeof = 0; | |
190 | for (;;) { | |
191 | if (pendingsigs) | |
192 | dotrap(); | |
193 | inter = 0; | |
194 | if (iflag && top) { | |
195 | inter++; | |
196 | showjobs(1); | |
197 | chkmail(0); | |
198 | flushout(&output); | |
199 | } | |
200 | n = parsecmd(inter); | |
201 | #ifdef DEBUG | |
202 | /* showtree(n); */ | |
203 | #endif | |
204 | if (n == NEOF) { | |
205 | if (Iflag == 0 || numeof >= 50) | |
206 | break; | |
207 | out2str("\nUse \"exit\" to leave shell.\n"); | |
208 | numeof++; | |
209 | } else if (n != NULL && nflag == 0) { | |
210 | if (inter) { | |
211 | INTOFF; | |
212 | if (prevcmd) | |
213 | freefunc(prevcmd); | |
214 | prevcmd = curcmd; | |
215 | curcmd = copyfunc(n); | |
216 | INTON; | |
217 | } | |
218 | evaltree(n, 0); | |
219 | #ifdef notdef | |
220 | if (exitstatus) /*DEBUG*/ | |
221 | outfmt(&errout, "Exit status 0x%X\n", exitstatus); | |
222 | #endif | |
223 | } | |
224 | popstackmark(&smark); | |
225 | } | |
226 | popstackmark(&smark); /* unnecessary */ | |
227 | } | |
228 | ||
229 | ||
230 | ||
231 | /* | |
232 | * Read /etc/profile or .profile. Return on error. | |
233 | */ | |
234 | ||
235 | STATIC void | |
236 | read_profile(name) | |
237 | char *name; | |
238 | { | |
239 | int fd; | |
240 | ||
241 | INTOFF; | |
242 | if ((fd = open(name, O_RDONLY)) >= 0) | |
243 | setinputfd(fd, 1); | |
244 | INTON; | |
245 | if (fd < 0) | |
246 | return; | |
247 | cmdloop(0); | |
248 | popfile(); | |
249 | } | |
250 | ||
251 | ||
252 | ||
253 | /* | |
254 | * Read a file containing shell functions. | |
255 | */ | |
256 | ||
257 | void | |
258 | readcmdfile(name) | |
259 | char *name; | |
260 | { | |
261 | int fd; | |
262 | ||
263 | INTOFF; | |
264 | if ((fd = open(name, O_RDONLY)) >= 0) | |
265 | setinputfd(fd, 1); | |
266 | else | |
267 | error("Can't open %s", name); | |
268 | INTON; | |
269 | cmdloop(0); | |
270 | popfile(); | |
271 | } | |
272 | ||
273 | ||
274 | ||
275 | /* | |
276 | * Take commands from a file. To be compatable we should do a path | |
277 | * search for the file, but a path search doesn't make any sense. | |
278 | */ | |
279 | ||
280 | dotcmd(argc, argv) char **argv; { | |
281 | exitstatus = 0; | |
282 | if (argc >= 2) { /* That's what SVR2 does */ | |
283 | setinputfile(argv[1], 1); | |
284 | commandname = argv[1]; | |
285 | cmdloop(0); | |
286 | popfile(); | |
287 | } | |
288 | return exitstatus; | |
289 | } | |
290 | ||
291 | ||
292 | exitcmd(argc, argv) char **argv; { | |
293 | if (argc > 1) | |
294 | exitstatus = number(argv[1]); | |
295 | exitshell(exitstatus); | |
296 | } | |
297 | ||
298 | ||
299 | lccmd(argc, argv) char **argv; { | |
300 | if (argc > 1) { | |
301 | defun(argv[1], prevcmd); | |
302 | return 0; | |
303 | } else { | |
304 | INTOFF; | |
305 | freefunc(curcmd); | |
306 | curcmd = prevcmd; | |
307 | prevcmd = NULL; | |
308 | INTON; | |
309 | evaltree(curcmd, 0); | |
310 | return exitstatus; | |
311 | } | |
312 | } | |
313 | ||
314 | ||
315 | ||
316 | #ifdef notdef | |
317 | /* | |
318 | * Should never be called. | |
319 | */ | |
320 | ||
321 | void | |
322 | exit(exitstatus) { | |
323 | _exit(exitstatus); | |
324 | } | |
325 | #endif |