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1.1 root 1: /* @(#)main.c 1.7 */
2: /*
3: * UNIX shell
4: *
5: * Bell Telephone Laboratories
6: *
7: */
8:
9: #include "defs.h"
10: #include "sym.h"
11: #include "timeout.h"
12: #include <sys/types.h>
13: #include <sys/stat.h>
14: #include <sys/filio.h>
15:
16: static BOOL beenhere = FALSE;
17: char tmpout[20] = "/tmp/sh-";
18: struct fileblk stdfile;
19: struct fileblk *standin = &stdfile;
20:
21: static int mailchk = 180;
22: static char *mailp;
23: static long mod_time = 0;
24:
25: #ifdef pdp11
26: #include <execargs.h>
27: #endif
28:
29: extern int exfile();
30: extern char *simple();
31:
32:
33:
34: main(c, v, e)
35: int c;
36: char *v[];
37: char *e[];
38: {
39: struct namnod *n;
40:
41: stdsigs();
42:
43: /*
44: * initialise storage allocation
45: */
46:
47: stakbot = 0;
48: addblok((unsigned)0);
49:
50: /*
51: * set names from userenv
52: */
53:
54: setup_env();
55:
56: /*
57: * look for options
58: * dolc is $#
59: */
60: dolc = options(c, v);
61:
62: if (dolc < 2)
63: {
64: flags |= stdflg;
65: {
66: register char *flagc = flagadr;
67:
68: while (*flagc)
69: flagc++;
70: *flagc++ = STDFLG;
71: *flagc = 0;
72: }
73: }
74: if ((flags & stdflg) == 0)
75: dolc--;
76: dolv = v + c - dolc;
77: dolc--;
78:
79: /*
80: * return here for shell file execution
81: * but not for parenthesis subshells
82: */
83: setjmp(subshell);
84:
85: /*
86: * number of positional parameters
87: */
88: replace(&cmdadr, dolv[0]); /* cmdadr is $0 */
89:
90: /*
91: * set pidname '$$'
92: */
93: assnum(&pidadr, getpid());
94:
95: /*
96: * set up temp file names
97: */
98: settmp();
99:
100: /*
101: * default internal field separators - $IFS
102: */
103: dfault(&ifsnod, sptbnl);
104:
105: if ((beenhere++) == FALSE) /* ? profile */
106: {
107: if (*(simple(cmdadr)) == '-')
108: {
109: if ((input = pathopen(nullstr, profile)) >= 0)
110: {
111: exfile(ttyflg);
112: flags &= ~ttyflg;
113: }
114: }
115: /*
116: * open input file if specified
117: */
118: if (comdiv)
119: {
120: estabf(comdiv);
121: input = -1;
122: }
123: else
124: {
125: input = ((flags & stdflg) ? 0 : chkopen(cmdadr));
126:
127: #ifdef ACCT
128: if (input != 0)
129: preacct(cmdadr);
130: #endif
131: comdiv--;
132: }
133: }
134: #ifdef pdp11
135: else
136: *execargs = (char *)dolv; /* for `ps' cmd */
137: #endif
138:
139: exfile(0);
140: done();
141: }
142:
143: static int
144: exfile(prof)
145: BOOL prof;
146: {
147: long mailtime = 0; /* Must not be a register variable */
148: long curtime = 0;
149: register int userid;
150:
151: /*
152: * move input
153: */
154: if (input > 0)
155: {
156: Ldup(input, INIO);
157: input = INIO;
158: }
159:
160: userid = geteuid();
161:
162: /*
163: * decide whether interactive
164: */
165: if ((flags & intflg) ||
166: ((flags&oneflg) == 0 &&
167: isatty(output) &&
168: isatty(input)) )
169:
170: {
171: dfault(&ps1nod, (userid ? stdprompt : supprompt));
172: dfault(&ps2nod, readmsg);
173: flags |= ttyflg | prompt;
174: ignsig(SIGTERM);
175: setmail(mailnod.namval.val);
176: }
177: else
178: {
179: flags |= prof;
180: flags &= ~prompt;
181: }
182:
183: if (setjmp(errshell) && prof)
184: {
185: close(input);
186: return;
187: }
188: /*
189: * error return here
190: */
191:
192: loopcnt = peekc = peekn = 0;
193: fndef = 0;
194: iopend = 0;
195:
196: if (input >= 0)
197: initf(input);
198: /*
199: * command loop
200: */
201: for (;;)
202: {
203: tdystak(0);
204: stakchk(); /* may reduce sbrk */
205: exitset();
206:
207: if ((flags & prompt) && standin->fstak == 0 && !eof)
208: {
209:
210: if (mailp)
211: {
212: time(&curtime);
213:
214: if ((curtime - mailtime) >= mailchk)
215: {
216: chkmail();
217: mailtime = curtime;
218: }
219: }
220:
221: prs(ps1nod.namval.val);
222:
223: #ifdef TIME_OUT
224: alarm(TIMEOUT);
225: #endif
226:
227: flags |= waiting;
228: }
229:
230: trapnote = 0;
231: peekc = readc();
232: if (eof)
233: return;
234:
235: #ifdef TIME_OUT
236: alarm(0);
237: #endif
238:
239: flags &= ~waiting;
240:
241: execute(cmd(NL, MTFLG), 0, eflag);
242: eof |= (flags & oneflg);
243: }
244: }
245:
246: chkpr()
247: {
248: if ((flags & prompt) && standin->fstak == 0)
249: prs(ps2nod.namval.val);
250: }
251:
252: settmp()
253: {
254: itos(getpid());
255: serial = 0;
256: tmpnam = movstr(numbuf, &tmpout[TMPNAM]);
257: }
258:
259: Ldup(fa, fb)
260: register int fa, fb;
261: {
262:
263: #ifndef SYSV
264: dup2(fa, fb);
265: close(fa);
266: ioctl(fb, FIOCLEX, 0);
267: #else
268: if (fa >= 0)
269: { close(fb);
270: fcntl(fa,0,fb); /* normal dup */
271: close(fa);
272: fcntl(fb, 2, 1); /* autoclose for fb */
273: }
274: #endif
275: }
276:
277:
278: chkmail()
279: {
280: struct stat statb;
281:
282: if (mailp && stat(mailp, &statb) >= 0)
283: {
284: if(statb.st_size && mod_time
285: && statb.st_mtime != mod_time)
286: {
287: prs(mailmsg);
288: }
289: mod_time = statb.st_mtime;
290: }
291: else if (mod_time == 0)
292: mod_time = 1;
293: }
294:
295:
296: setmail(mailpath)
297: char *mailpath;
298: {
299:
300: if (mailp = mailpath)
301: mod_time=0;
302: }
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