1 /* $NetBSD: main.c,v 1.32 1999/02/05 21:21:27 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 __COPYRIGHT("@(#) Copyright (c) 1991, 1993\n\ 42 The Regents of the University of California. All rights reserved.\n"); 43 #endif /* not lint */ 44 45 #ifndef lint 46 #if 0 47 static char sccsid[] = "@(#)main.c 8.7 (Berkeley) 7/19/95"; 48 #else 49 __RCSID("$NetBSD: main.c,v 1.32 1999/02/05 21:21:27 christos Exp $"); 50 #endif 51 #endif /* not lint */ 52 53 #include <stdio.h> 54 #include <signal.h> 55 #include <sys/stat.h> 56 #include <unistd.h> 57 #include <fcntl.h> 58 59 60 #include "shell.h" 61 #include "main.h" 62 #include "mail.h" 63 #include "options.h" 64 #include "output.h" 65 #include "parser.h" 66 #include "nodes.h" 67 #include "expand.h" 68 #include "eval.h" 69 #include "jobs.h" 70 #include "input.h" 71 #include "trap.h" 72 #include "var.h" 73 #include "show.h" 74 #include "memalloc.h" 75 #include "error.h" 76 #include "init.h" 77 #include "mystring.h" 78 #include "exec.h" 79 #include "cd.h" 80 81 #define PROFILE 0 82 83 int rootpid; 84 int rootshell; 85 STATIC union node *curcmd; 86 STATIC union node *prevcmd; 87 extern int errno; 88 #if PROFILE 89 short profile_buf[16384]; 90 extern int etext(); 91 #endif 92 93 STATIC void read_profile __P((char *)); 94 STATIC char *find_dot_file __P((char *)); 95 int main __P((int, char **)); 96 97 /* 98 * Main routine. We initialize things, parse the arguments, execute 99 * profiles if we're a login shell, and then call cmdloop to execute 100 * commands. The setjmp call sets up the location to jump to when an 101 * exception occurs. When an exception occurs the variable "state" 102 * is used to figure out how far we had gotten. 103 */ 104 105 int 106 main(argc, argv) 107 int argc; 108 char **argv; 109 { 110 struct jmploc jmploc; 111 struct stackmark smark; 112 volatile int state; 113 char *shinit; 114 115 #if PROFILE 116 monitor(4, etext, profile_buf, sizeof profile_buf, 50); 117 #endif 118 state = 0; 119 if (setjmp(jmploc.loc)) { 120 /* 121 * When a shell procedure is executed, we raise the 122 * exception EXSHELLPROC to clean up before executing 123 * the shell procedure. 124 */ 125 switch (exception) { 126 case EXSHELLPROC: 127 rootpid = getpid(); 128 rootshell = 1; 129 minusc = NULL; 130 state = 3; 131 break; 132 133 case EXEXEC: 134 exitstatus = exerrno; 135 break; 136 137 case EXERROR: 138 exitstatus = 2; 139 break; 140 141 default: 142 break; 143 } 144 145 if (exception != EXSHELLPROC) { 146 if (state == 0 || iflag == 0 || ! rootshell) 147 exitshell(exitstatus); 148 } 149 reset(); 150 if (exception == EXINT 151 #if ATTY 152 && (! attyset() || equal(termval(), "emacs")) 153 #endif 154 ) { 155 out2c('\n'); 156 flushout(&errout); 157 } 158 popstackmark(&smark); 159 FORCEINTON; /* enable interrupts */ 160 if (state == 1) 161 goto state1; 162 else if (state == 2) 163 goto state2; 164 else if (state == 3) 165 goto state3; 166 else 167 goto state4; 168 } 169 handler = &jmploc; 170 #ifdef DEBUG 171 opentrace(); 172 trputs("Shell args: "); trargs(argv); 173 #endif 174 rootpid = getpid(); 175 rootshell = 1; 176 init(); 177 setstackmark(&smark); 178 procargs(argc, argv); 179 if (argv[0] && argv[0][0] == '-') { 180 state = 1; 181 read_profile("/etc/profile"); 182 state1: 183 state = 2; 184 read_profile(".profile"); 185 } 186 state2: 187 state = 3; 188 if (getuid() == geteuid() && getgid() == getegid()) { 189 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 190 state = 3; 191 read_profile(shinit); 192 } 193 } 194 state3: 195 state = 4; 196 if (minusc) { 197 static int sigs[] = { 198 SIGINT, SIGQUIT, SIGHUP, 199 #ifdef SIGTSTP 200 SIGTSTP, 201 #endif 202 SIGPIPE 203 }; 204 #define SIGSSIZE (sizeof(sigs)/sizeof(sigs[0])) 205 int i; 206 207 for (i = 0; i < SIGSSIZE; i++) 208 setsignal(sigs[i]); 209 evalstring(minusc); 210 } 211 if (sflag || minusc == NULL) { 212 state4: /* XXX ??? - why isn't this before the "if" statement */ 213 cmdloop(1); 214 } 215 #if PROFILE 216 monitor(0); 217 #endif 218 exitshell(exitstatus); 219 /* NOTREACHED */ 220 } 221 222 223 /* 224 * Read and execute commands. "Top" is nonzero for the top level command 225 * loop; it turns on prompting if the shell is interactive. 226 */ 227 228 void 229 cmdloop(top) 230 int top; 231 { 232 union node *n; 233 struct stackmark smark; 234 int inter; 235 int numeof = 0; 236 237 TRACE(("cmdloop(%d) called\n", top)); 238 setstackmark(&smark); 239 for (;;) { 240 if (pendingsigs) 241 dotrap(); 242 inter = 0; 243 if (iflag && top) { 244 inter++; 245 showjobs(1); 246 chkmail(0); 247 flushout(&output); 248 } 249 n = parsecmd(inter); 250 /* showtree(n); DEBUG */ 251 if (n == NEOF) { 252 if (!top || numeof >= 50) 253 break; 254 if (!stoppedjobs()) { 255 if (!Iflag) 256 break; 257 out2str("\nUse \"exit\" to leave shell.\n"); 258 } 259 numeof++; 260 } else if (n != NULL && nflag == 0) { 261 job_warning = (job_warning == 2) ? 1 : 0; 262 numeof = 0; 263 evaltree(n, 0); 264 } 265 popstackmark(&smark); 266 if (evalskip == SKIPFILE) { 267 evalskip = 0; 268 break; 269 } 270 } 271 popstackmark(&smark); /* unnecessary */ 272 } 273 274 275 276 /* 277 * Read /etc/profile or .profile. Return on error. 278 */ 279 280 STATIC void 281 read_profile(name) 282 char *name; 283 { 284 int fd; 285 int xflag_set = 0; 286 int vflag_set = 0; 287 288 INTOFF; 289 if ((fd = open(name, O_RDONLY)) >= 0) 290 setinputfd(fd, 1); 291 INTON; 292 if (fd < 0) 293 return; 294 /* -q turns off -x and -v just when executing init files */ 295 if (qflag) { 296 if (xflag) 297 xflag = 0, xflag_set = 1; 298 if (vflag) 299 vflag = 0, vflag_set = 1; 300 } 301 cmdloop(0); 302 if (qflag) { 303 if (xflag_set) 304 xflag = 1; 305 if (vflag_set) 306 vflag = 1; 307 } 308 popfile(); 309 } 310 311 312 313 /* 314 * Read a file containing shell functions. 315 */ 316 317 void 318 readcmdfile(name) 319 char *name; 320 { 321 int fd; 322 323 INTOFF; 324 if ((fd = open(name, O_RDONLY)) >= 0) 325 setinputfd(fd, 1); 326 else 327 error("Can't open %s", name); 328 INTON; 329 cmdloop(0); 330 popfile(); 331 } 332 333 334 335 /* 336 * Take commands from a file. To be compatable we should do a path 337 * search for the file, which is necessary to find sub-commands. 338 */ 339 340 341 STATIC char * 342 find_dot_file(basename) 343 char *basename; 344 { 345 char *fullname; 346 char *path = pathval(); 347 struct stat statb; 348 349 /* don't try this for absolute or relative paths */ 350 if (strchr(basename, '/')) 351 return basename; 352 353 while ((fullname = padvance(&path, basename)) != NULL) { 354 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { 355 /* 356 * Don't bother freeing here, since it will 357 * be freed by the caller. 358 */ 359 return fullname; 360 } 361 stunalloc(fullname); 362 } 363 364 /* not found in the PATH */ 365 error("%s: not found", basename); 366 /* NOTREACHED */ 367 } 368 369 int 370 dotcmd(argc, argv) 371 int argc; 372 char **argv; 373 { 374 struct strlist *sp; 375 exitstatus = 0; 376 377 for (sp = cmdenviron; sp ; sp = sp->next) 378 setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); 379 380 if (argc >= 2) { /* That's what SVR2 does */ 381 char *fullname; 382 struct stackmark smark; 383 384 setstackmark(&smark); 385 fullname = find_dot_file(argv[1]); 386 setinputfile(fullname, 1); 387 commandname = fullname; 388 cmdloop(0); 389 popfile(); 390 popstackmark(&smark); 391 } 392 return exitstatus; 393 } 394 395 396 int 397 exitcmd(argc, argv) 398 int argc; 399 char **argv; 400 { 401 extern int oexitstatus; 402 403 if (stoppedjobs()) 404 return 0; 405 if (argc > 1) 406 exitstatus = number(argv[1]); 407 else 408 exitstatus = oexitstatus; 409 exitshell(exitstatus); 410 /* NOTREACHED */ 411 } 412