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6c5bf7b4 | 1 | /*- |
d1b73048 KB |
2 | * Copyright (c) 1991, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
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4 | * |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Kenneth Almquist. | |
7 | * | |
ad787160 C |
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. | |
3c5341d1 | 23 | * |
ad787160 C |
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. | |
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35 | */ |
36 | ||
37 | #ifndef lint | |
d1b73048 KB |
38 | static char copyright[] = |
39 | "@(#) Copyright (c) 1991, 1993\n\ | |
40 | The Regents of the University of California. All rights reserved.\n"; | |
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41 | #endif /* not lint */ |
42 | ||
43 | #ifndef lint | |
ad787160 | 44 | static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 5/31/93"; |
6c5bf7b4 KB |
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" | |
6c5bf7b4 | 60 | #include "var.h" |
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61 | #include "memalloc.h" |
62 | #include "error.h" | |
63 | #include "init.h" | |
64 | #include "mystring.h" | |
65 | ||
66 | #define PROFILE 0 | |
67 | ||
68 | int rootpid; | |
69 | int rootshell; | |
70 | STATIC union node *curcmd; | |
71 | STATIC union node *prevcmd; | |
72 | extern int errno; | |
73 | #if PROFILE | |
74 | short profile_buf[16384]; | |
75 | extern int etext(); | |
76 | #endif | |
77 | ||
78 | #ifdef __STDC__ | |
79 | STATIC void read_profile(char *); | |
80 | char *getenv(char *); | |
81 | #else | |
82 | STATIC void read_profile(); | |
83 | char *getenv(); | |
84 | #endif | |
85 | ||
86 | ||
87 | /* | |
88 | * Main routine. We initialize things, parse the arguments, execute | |
89 | * profiles if we're a login shell, and then call cmdloop to execute | |
90 | * commands. The setjmp call sets up the location to jump to when an | |
91 | * exception occurs. When an exception occurs the variable "state" | |
92 | * is used to figure out how far we had gotten. | |
93 | */ | |
94 | ||
95 | main(argc, argv) char **argv; { | |
96 | struct jmploc jmploc; | |
97 | struct stackmark smark; | |
98 | volatile int state; | |
99 | char *shinit; | |
100 | ||
101 | #if PROFILE | |
102 | monitor(4, etext, profile_buf, sizeof profile_buf, 50); | |
103 | #endif | |
104 | state = 0; | |
105 | if (setjmp(jmploc.loc)) { | |
106 | /* | |
107 | * When a shell procedure is executed, we raise the | |
108 | * exception EXSHELLPROC to clean up before executing | |
109 | * the shell procedure. | |
110 | */ | |
111 | if (exception == EXSHELLPROC) { | |
112 | rootpid = getpid(); | |
113 | rootshell = 1; | |
114 | minusc = NULL; | |
115 | state = 3; | |
116 | } else if (state == 0 || iflag == 0 || ! rootshell) | |
117 | exitshell(2); | |
118 | reset(); | |
6c5bf7b4 | 119 | if (exception == EXINT |
8979b8b4 MT |
120 | #if ATTY |
121 | && (! attyset() || equal(termval(), "emacs")) | |
6c5bf7b4 | 122 | #endif |
8979b8b4 | 123 | ) { |
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124 | out2c('\n'); |
125 | flushout(&errout); | |
126 | } | |
127 | popstackmark(&smark); | |
128 | FORCEINTON; /* enable interrupts */ | |
129 | if (state == 1) | |
130 | goto state1; | |
131 | else if (state == 2) | |
132 | goto state2; | |
efcbb576 | 133 | else if (state == 3) |
6c5bf7b4 | 134 | goto state3; |
efcbb576 MT |
135 | else |
136 | goto state4; | |
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137 | } |
138 | handler = &jmploc; | |
139 | #ifdef DEBUG | |
140 | opentrace(); | |
141 | trputs("Shell args: "); trargs(argv); | |
142 | #endif | |
143 | rootpid = getpid(); | |
144 | rootshell = 1; | |
145 | init(); | |
146 | setstackmark(&smark); | |
147 | procargs(argc, argv); | |
148 | if (argv[0] && argv[0][0] == '-') { | |
149 | state = 1; | |
150 | read_profile("/etc/profile"); | |
151 | state1: | |
152 | state = 2; | |
153 | read_profile(".profile"); | |
efcbb576 | 154 | } |
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155 | state2: |
156 | state = 3; | |
15341c0e | 157 | if ((shinit = lookupvar("ENV")) != NULL && |
efcbb576 MT |
158 | *shinit != '\0') { |
159 | state = 3; | |
160 | read_profile(shinit); | |
161 | } | |
162 | state3: | |
163 | state = 4; | |
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164 | if (minusc) { |
165 | evalstring(minusc); | |
166 | } | |
167 | if (sflag || minusc == NULL) { | |
efcbb576 | 168 | state4: /* XXX ??? - why isn't this before the "if" statement */ |
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169 | cmdloop(1); |
170 | } | |
171 | #if PROFILE | |
172 | monitor(0); | |
173 | #endif | |
174 | exitshell(exitstatus); | |
175 | } | |
176 | ||
177 | ||
178 | /* | |
179 | * Read and execute commands. "Top" is nonzero for the top level command | |
180 | * loop; it turns on prompting if the shell is interactive. | |
181 | */ | |
182 | ||
183 | void | |
184 | cmdloop(top) { | |
185 | union node *n; | |
186 | struct stackmark smark; | |
187 | int inter; | |
9acb6ed5 | 188 | int numeof = 0; |
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189 | |
190 | TRACE(("cmdloop(%d) called\n", top)); | |
191 | setstackmark(&smark); | |
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192 | for (;;) { |
193 | if (pendingsigs) | |
194 | dotrap(); | |
195 | inter = 0; | |
196 | if (iflag && top) { | |
197 | inter++; | |
198 | showjobs(1); | |
199 | chkmail(0); | |
200 | flushout(&output); | |
201 | } | |
202 | n = parsecmd(inter); | |
0dc9f70e | 203 | /* showtree(n); DEBUG */ |
6c5bf7b4 | 204 | if (n == NEOF) { |
0dc9f70e | 205 | if (!top || numeof >= 50) |
6c5bf7b4 | 206 | break; |
0dc9f70e MT |
207 | if (!stoppedjobs()) { |
208 | if (!Iflag) | |
209 | break; | |
210 | out2str("\nUse \"exit\" to leave shell.\n"); | |
211 | } | |
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212 | numeof++; |
213 | } else if (n != NULL && nflag == 0) { | |
0dc9f70e | 214 | job_warning = (job_warning == 2) ? 1 : 0; |
9acb6ed5 | 215 | numeof = 0; |
6c5bf7b4 | 216 | evaltree(n, 0); |
6c5bf7b4 KB |
217 | } |
218 | popstackmark(&smark); | |
219 | } | |
220 | popstackmark(&smark); /* unnecessary */ | |
221 | } | |
222 | ||
223 | ||
224 | ||
225 | /* | |
226 | * Read /etc/profile or .profile. Return on error. | |
227 | */ | |
228 | ||
229 | STATIC void | |
230 | read_profile(name) | |
231 | char *name; | |
232 | { | |
233 | int fd; | |
234 | ||
235 | INTOFF; | |
236 | if ((fd = open(name, O_RDONLY)) >= 0) | |
237 | setinputfd(fd, 1); | |
238 | INTON; | |
239 | if (fd < 0) | |
240 | return; | |
241 | cmdloop(0); | |
242 | popfile(); | |
243 | } | |
244 | ||
245 | ||
246 | ||
247 | /* | |
248 | * Read a file containing shell functions. | |
249 | */ | |
250 | ||
251 | void | |
252 | readcmdfile(name) | |
253 | char *name; | |
254 | { | |
255 | int fd; | |
256 | ||
257 | INTOFF; | |
258 | if ((fd = open(name, O_RDONLY)) >= 0) | |
259 | setinputfd(fd, 1); | |
260 | else | |
261 | error("Can't open %s", name); | |
262 | INTON; | |
263 | cmdloop(0); | |
264 | popfile(); | |
265 | } | |
266 | ||
267 | ||
268 | ||
269 | /* | |
270 | * Take commands from a file. To be compatable we should do a path | |
271 | * search for the file, but a path search doesn't make any sense. | |
272 | */ | |
273 | ||
274 | dotcmd(argc, argv) char **argv; { | |
275 | exitstatus = 0; | |
276 | if (argc >= 2) { /* That's what SVR2 does */ | |
277 | setinputfile(argv[1], 1); | |
278 | commandname = argv[1]; | |
279 | cmdloop(0); | |
280 | popfile(); | |
281 | } | |
282 | return exitstatus; | |
283 | } | |
284 | ||
285 | ||
286 | exitcmd(argc, argv) char **argv; { | |
0dc9f70e MT |
287 | if (stoppedjobs()) |
288 | return; | |
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289 | if (argc > 1) |
290 | exitstatus = number(argv[1]); | |
291 | exitshell(exitstatus); | |
292 | } | |
293 | ||
294 | ||
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295 | #ifdef notdef |
296 | /* | |
297 | * Should never be called. | |
298 | */ | |
299 | ||
300 | void | |
301 | exit(exitstatus) { | |
302 | _exit(exitstatus); | |
303 | } | |
304 | #endif |