1 /* $NetBSD: main.c,v 1.48 2003/09/14 12:09:29 jmmv 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 __COPYRIGHT("@(#) Copyright (c) 1991, 1993\n\ 38 The Regents of the University of California. All rights reserved.\n"); 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)main.c 8.7 (Berkeley) 7/19/95"; 44 #else 45 __RCSID("$NetBSD: main.c,v 1.48 2003/09/14 12:09:29 jmmv Exp $"); 46 #endif 47 #endif /* not lint */ 48 49 #include <errno.h> 50 #include <stdio.h> 51 #include <signal.h> 52 #include <sys/stat.h> 53 #include <unistd.h> 54 #include <locale.h> 55 #include <fcntl.h> 56 57 58 #include "shell.h" 59 #include "main.h" 60 #include "mail.h" 61 #include "options.h" 62 #include "output.h" 63 #include "parser.h" 64 #include "nodes.h" 65 #include "expand.h" 66 #include "eval.h" 67 #include "jobs.h" 68 #include "input.h" 69 #include "trap.h" 70 #include "var.h" 71 #include "show.h" 72 #include "memalloc.h" 73 #include "error.h" 74 #include "init.h" 75 #include "mystring.h" 76 #include "exec.h" 77 #include "cd.h" 78 79 #define PROFILE 0 80 81 int rootpid; 82 int rootshell; 83 STATIC union node *curcmd; 84 STATIC union node *prevcmd; 85 #if PROFILE 86 short profile_buf[16384]; 87 extern int etext(); 88 #endif 89 90 STATIC void read_profile(const char *); 91 STATIC char *find_dot_file(char *); 92 int main(int, char **); 93 94 /* 95 * Main routine. We initialize things, parse the arguments, execute 96 * profiles if we're a login shell, and then call cmdloop to execute 97 * commands. The setjmp call sets up the location to jump to when an 98 * exception occurs. When an exception occurs the variable "state" 99 * is used to figure out how far we had gotten. 100 */ 101 102 int 103 main(int argc, char **argv) 104 { 105 struct jmploc jmploc; 106 struct stackmark smark; 107 volatile int state; 108 char *shinit; 109 110 setlocale(LC_ALL, ""); 111 112 #if PROFILE 113 monitor(4, etext, profile_buf, sizeof profile_buf, 50); 114 #endif 115 state = 0; 116 if (setjmp(jmploc.loc)) { 117 /* 118 * When a shell procedure is executed, we raise the 119 * exception EXSHELLPROC to clean up before executing 120 * the shell procedure. 121 */ 122 switch (exception) { 123 case EXSHELLPROC: 124 rootpid = getpid(); 125 rootshell = 1; 126 minusc = NULL; 127 state = 3; 128 break; 129 130 case EXEXEC: 131 exitstatus = exerrno; 132 break; 133 134 case EXERROR: 135 exitstatus = 2; 136 break; 137 138 default: 139 break; 140 } 141 142 if (exception != EXSHELLPROC) { 143 if (state == 0 || iflag == 0 || ! rootshell) 144 exitshell(exitstatus); 145 } 146 reset(); 147 if (exception == EXINT 148 #if ATTY 149 && (! attyset() || equal(termval(), "emacs")) 150 #endif 151 ) { 152 out2c('\n'); 153 flushout(&errout); 154 } 155 popstackmark(&smark); 156 FORCEINTON; /* enable interrupts */ 157 if (state == 1) 158 goto state1; 159 else if (state == 2) 160 goto state2; 161 else if (state == 3) 162 goto state3; 163 else 164 goto state4; 165 } 166 handler = &jmploc; 167 #ifdef DEBUG 168 #if DEBUG == 2 169 debug = 1; 170 #endif 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], 0); 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(int top) 233 { 234 union node *n; 235 struct stackmark smark; 236 int inter; 237 int numeof = 0; 238 239 TRACE(("cmdloop(%d) called\n", top)); 240 setstackmark(&smark); 241 for (;;) { 242 if (pendingsigs) 243 dotrap(); 244 inter = 0; 245 if (iflag && top) { 246 inter = 1; 247 showjobs(out2, SHOW_CHANGED); 248 chkmail(0); 249 flushout(&errout); 250 } 251 n = parsecmd(inter); 252 /* showtree(n); DEBUG */ 253 if (n == NEOF) { 254 if (!top || numeof >= 50) 255 break; 256 if (!stoppedjobs()) { 257 if (!Iflag) 258 break; 259 out2str("\nUse \"exit\" to leave shell.\n"); 260 } 261 numeof++; 262 } else if (n != NULL && nflag == 0) { 263 job_warning = (job_warning == 2) ? 1 : 0; 264 numeof = 0; 265 evaltree(n, 0); 266 } 267 popstackmark(&smark); 268 setstackmark(&smark); 269 if (evalskip == SKIPFILE) { 270 evalskip = 0; 271 break; 272 } 273 } 274 popstackmark(&smark); 275 } 276 277 278 279 /* 280 * Read /etc/profile or .profile. Return on error. 281 */ 282 283 STATIC void 284 read_profile(const char *name) 285 { 286 int fd; 287 int xflag_set = 0; 288 int vflag_set = 0; 289 290 INTOFF; 291 if ((fd = open(name, O_RDONLY)) >= 0) 292 setinputfd(fd, 1); 293 INTON; 294 if (fd < 0) 295 return; 296 /* -q turns off -x and -v just when executing init files */ 297 if (qflag) { 298 if (xflag) 299 xflag = 0, xflag_set = 1; 300 if (vflag) 301 vflag = 0, vflag_set = 1; 302 } 303 cmdloop(0); 304 if (qflag) { 305 if (xflag_set) 306 xflag = 1; 307 if (vflag_set) 308 vflag = 1; 309 } 310 popfile(); 311 } 312 313 314 315 /* 316 * Read a file containing shell functions. 317 */ 318 319 void 320 readcmdfile(char *name) 321 { 322 int fd; 323 324 INTOFF; 325 if ((fd = open(name, O_RDONLY)) >= 0) 326 setinputfd(fd, 1); 327 else 328 error("Can't open %s", name); 329 INTON; 330 cmdloop(0); 331 popfile(); 332 } 333 334 335 336 /* 337 * Take commands from a file. To be compatible we should do a path 338 * search for the file, which is necessary to find sub-commands. 339 */ 340 341 342 STATIC char * 343 find_dot_file(char *basename) 344 { 345 char *fullname; 346 const 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(int argc, char **argv) 371 { 372 exitstatus = 0; 373 374 if (argc >= 2) { /* That's what SVR2 does */ 375 char *fullname; 376 struct stackmark smark; 377 378 setstackmark(&smark); 379 fullname = find_dot_file(argv[1]); 380 setinputfile(fullname, 1); 381 commandname = fullname; 382 cmdloop(0); 383 popfile(); 384 popstackmark(&smark); 385 } 386 return exitstatus; 387 } 388 389 390 int 391 exitcmd(int argc, char **argv) 392 { 393 if (stoppedjobs()) 394 return 0; 395 if (argc > 1) 396 exitstatus = number(argv[1]); 397 exitshell(exitstatus); 398 /* NOTREACHED */ 399 } 400