1 /* $NetBSD: main.c,v 1.38 2000/05/22 10:18:47 elric 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 1.38 2000/05/22 10:18:47 elric Exp $"); 50 #endif 51 #endif /* not lint */ 52 53 #include <errno.h> 54 #include <stdio.h> 55 #include <signal.h> 56 #include <sys/stat.h> 57 #include <unistd.h> 58 #include <fcntl.h> 59 60 61 #include "shell.h" 62 #include "main.h" 63 #include "mail.h" 64 #include "options.h" 65 #include "output.h" 66 #include "parser.h" 67 #include "nodes.h" 68 #include "expand.h" 69 #include "eval.h" 70 #include "jobs.h" 71 #include "input.h" 72 #include "trap.h" 73 #include "var.h" 74 #include "show.h" 75 #include "memalloc.h" 76 #include "error.h" 77 #include "init.h" 78 #include "mystring.h" 79 #include "exec.h" 80 #include "cd.h" 81 82 #define PROFILE 0 83 84 int rootpid; 85 int rootshell; 86 STATIC union node *curcmd; 87 STATIC union node *prevcmd; 88 #if PROFILE 89 short profile_buf[16384]; 90 extern int etext(); 91 #endif 92 93 STATIC void read_profile __P((const 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 (sflag == 0 || 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 } 210 211 if (minusc) 212 evalstring(minusc, 0); 213 214 if (sflag || minusc == NULL) { 215 state4: /* XXX ??? - why isn't this before the "if" statement */ 216 cmdloop(1); 217 } 218 #if PROFILE 219 monitor(0); 220 #endif 221 exitshell(exitstatus); 222 /* NOTREACHED */ 223 } 224 225 226 /* 227 * Read and execute commands. "Top" is nonzero for the top level command 228 * loop; it turns on prompting if the shell is interactive. 229 */ 230 231 void 232 cmdloop(top) 233 int top; 234 { 235 union node *n; 236 struct stackmark smark; 237 int inter; 238 int numeof = 0; 239 240 TRACE(("cmdloop(%d) called\n", top)); 241 setstackmark(&smark); 242 for (;;) { 243 if (pendingsigs) 244 dotrap(); 245 inter = 0; 246 if (iflag && top) { 247 inter++; 248 showjobs(1); 249 chkmail(0); 250 flushout(&output); 251 } 252 n = parsecmd(inter); 253 /* showtree(n); DEBUG */ 254 if (n == NEOF) { 255 if (!top || numeof >= 50) 256 break; 257 if (!stoppedjobs()) { 258 if (!Iflag) 259 break; 260 out2str("\nUse \"exit\" to leave shell.\n"); 261 } 262 numeof++; 263 } else if (n != NULL && nflag == 0) { 264 job_warning = (job_warning == 2) ? 1 : 0; 265 numeof = 0; 266 evaltree(n, 0); 267 } 268 popstackmark(&smark); 269 if (evalskip == SKIPFILE) { 270 evalskip = 0; 271 break; 272 } 273 } 274 popstackmark(&smark); /* unnecessary */ 275 } 276 277 278 279 /* 280 * Read /etc/profile or .profile. Return on error. 281 */ 282 283 STATIC void 284 read_profile(name) 285 const char *name; 286 { 287 int fd; 288 int xflag_set = 0; 289 int vflag_set = 0; 290 291 INTOFF; 292 if ((fd = open(name, O_RDONLY)) >= 0) 293 setinputfd(fd, 1); 294 INTON; 295 if (fd < 0) 296 return; 297 /* -q turns off -x and -v just when executing init files */ 298 if (qflag) { 299 if (xflag) 300 xflag = 0, xflag_set = 1; 301 if (vflag) 302 vflag = 0, vflag_set = 1; 303 } 304 cmdloop(0); 305 if (qflag) { 306 if (xflag_set) 307 xflag = 1; 308 if (vflag_set) 309 vflag = 1; 310 } 311 popfile(); 312 } 313 314 315 316 /* 317 * Read a file containing shell functions. 318 */ 319 320 void 321 readcmdfile(name) 322 char *name; 323 { 324 int fd; 325 326 INTOFF; 327 if ((fd = open(name, O_RDONLY)) >= 0) 328 setinputfd(fd, 1); 329 else 330 error("Can't open %s", name); 331 INTON; 332 cmdloop(0); 333 popfile(); 334 } 335 336 337 338 /* 339 * Take commands from a file. To be compatable we should do a path 340 * search for the file, which is necessary to find sub-commands. 341 */ 342 343 344 STATIC char * 345 find_dot_file(basename) 346 char *basename; 347 { 348 char *fullname; 349 const char *path = pathval(); 350 struct stat statb; 351 352 /* don't try this for absolute or relative paths */ 353 if (strchr(basename, '/')) 354 return basename; 355 356 while ((fullname = padvance(&path, basename)) != NULL) { 357 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { 358 /* 359 * Don't bother freeing here, since it will 360 * be freed by the caller. 361 */ 362 return fullname; 363 } 364 stunalloc(fullname); 365 } 366 367 /* not found in the PATH */ 368 error("%s: not found", basename); 369 /* NOTREACHED */ 370 } 371 372 int 373 dotcmd(argc, argv) 374 int argc; 375 char **argv; 376 { 377 struct strlist *sp; 378 exitstatus = 0; 379 380 for (sp = cmdenviron; sp ; sp = sp->next) 381 setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); 382 383 if (argc >= 2) { /* That's what SVR2 does */ 384 char *fullname; 385 struct stackmark smark; 386 387 setstackmark(&smark); 388 fullname = find_dot_file(argv[1]); 389 setinputfile(fullname, 1); 390 commandname = fullname; 391 cmdloop(0); 392 popfile(); 393 popstackmark(&smark); 394 } 395 return exitstatus; 396 } 397 398 399 int 400 exitcmd(argc, argv) 401 int argc; 402 char **argv; 403 { 404 extern int oexitstatus; 405 406 if (stoppedjobs()) 407 return 0; 408 if (argc > 1) 409 exitstatus = number(argv[1]); 410 else 411 exitstatus = oexitstatus; 412 exitshell(exitstatus); 413 /* NOTREACHED */ 414 } 415