1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 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. 23 * 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. 35 * 36 * $Id$ 37 */ 38 39 #ifndef lint 40 static char const copyright[] = 41 "@(#) 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 static char const sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/28/95"; 47 #endif /* not lint */ 48 49 #include <stdio.h> 50 #include <signal.h> 51 #include <sys/stat.h> 52 #include <unistd.h> 53 #include <fcntl.h> 54 #include <locale.h> 55 56 57 #include "shell.h" 58 #include "main.h" 59 #include "mail.h" 60 #include "options.h" 61 #include "output.h" 62 #include "parser.h" 63 #include "nodes.h" 64 #include "expand.h" 65 #include "eval.h" 66 #include "jobs.h" 67 #include "input.h" 68 #include "trap.h" 69 #include "var.h" 70 #include "show.h" 71 #include "memalloc.h" 72 #include "error.h" 73 #include "init.h" 74 #include "mystring.h" 75 #include "exec.h" 76 #include "cd.h" 77 78 #define PROFILE 0 79 80 int rootpid; 81 int rootshell; 82 extern int errno; 83 #if PROFILE 84 short profile_buf[16384]; 85 extern int etext(); 86 #endif 87 88 STATIC void read_profile __P((char *)); 89 STATIC char *find_dot_file __P((char *)); 90 91 /* 92 * Main routine. We initialize things, parse the arguments, execute 93 * profiles if we're a login shell, and then call cmdloop to execute 94 * commands. The setjmp call sets up the location to jump to when an 95 * exception occurs. When an exception occurs the variable "state" 96 * is used to figure out how far we had gotten. 97 */ 98 99 int 100 main(argc, argv) 101 int argc; 102 char **argv; 103 { 104 struct jmploc jmploc; 105 struct stackmark smark; 106 volatile int state; 107 char *shinit; 108 109 #if PROFILE 110 monitor(4, etext, profile_buf, sizeof profile_buf, 50); 111 #endif 112 (void) setlocale(LC_ALL, ""); 113 state = 0; 114 if (setjmp(jmploc.loc)) { 115 /* 116 * When a shell procedure is executed, we raise the 117 * exception EXSHELLPROC to clean up before executing 118 * the shell procedure. 119 */ 120 switch (exception) { 121 case EXSHELLPROC: 122 rootpid = getpid(); 123 rootshell = 1; 124 minusc = NULL; 125 state = 3; 126 break; 127 128 case EXEXEC: 129 exitstatus = exerrno; 130 break; 131 132 case EXERROR: 133 exitstatus = 2; 134 break; 135 136 default: 137 break; 138 } 139 140 if (exception != EXSHELLPROC) { 141 if (state == 0 || iflag == 0 || ! rootshell) 142 exitshell(exitstatus); 143 } 144 reset(); 145 if (exception == EXINT 146 #if ATTY 147 && (! attyset() || equal(termval(), "emacs")) 148 #endif 149 ) { 150 out2c('\n'); 151 flushout(&errout); 152 } 153 popstackmark(&smark); 154 FORCEINTON; /* enable interrupts */ 155 if (state == 1) 156 goto state1; 157 else if (state == 2) 158 goto state2; 159 else if (state == 3) 160 goto state3; 161 else 162 goto state4; 163 } 164 handler = &jmploc; 165 #ifdef DEBUG 166 opentrace(); 167 trputs("Shell args: "); trargs(argv); 168 #endif 169 rootpid = getpid(); 170 rootshell = 1; 171 init(); 172 setstackmark(&smark); 173 procargs(argc, argv); 174 if (getpwd() == NULL && iflag) 175 out2str("sh: cannot determine working directory\n"); 176 if (argv[0] && argv[0][0] == '-') { 177 state = 1; 178 read_profile("/etc/profile"); 179 state1: 180 state = 2; 181 if (privileged == 0) 182 read_profile(".profile"); 183 else 184 read_profile("/etc/suid_profile"); 185 } 186 state2: 187 state = 3; 188 if (privileged == 0) { 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 evalstring(minusc); 198 } 199 if (sflag || minusc == NULL) { 200 state4: /* XXX ??? - why isn't this before the "if" statement */ 201 cmdloop(1); 202 } 203 #if PROFILE 204 monitor(0); 205 #endif 206 exitshell(exitstatus); 207 /*NOTREACHED*/ 208 return 0; 209 } 210 211 212 /* 213 * Read and execute commands. "Top" is nonzero for the top level command 214 * loop; it turns on prompting if the shell is interactive. 215 */ 216 217 void 218 cmdloop(top) 219 int top; 220 { 221 union node *n; 222 struct stackmark smark; 223 int inter; 224 int numeof = 0; 225 226 TRACE(("cmdloop(%d) called\n", top)); 227 setstackmark(&smark); 228 for (;;) { 229 if (pendingsigs) 230 dotrap(); 231 inter = 0; 232 if (iflag && top) { 233 inter++; 234 showjobs(1); 235 chkmail(0); 236 flushout(&output); 237 } 238 n = parsecmd(inter); 239 /* showtree(n); DEBUG */ 240 if (n == NEOF) { 241 if (!top || numeof >= 50) 242 break; 243 if (!stoppedjobs()) { 244 if (!Iflag) 245 break; 246 out2str("\nUse \"exit\" to leave shell.\n"); 247 } 248 numeof++; 249 } else if (n != NULL && nflag == 0) { 250 job_warning = (job_warning == 2) ? 1 : 0; 251 numeof = 0; 252 evaltree(n, 0); 253 } 254 popstackmark(&smark); 255 if (evalskip == SKIPFILE) { 256 evalskip = 0; 257 break; 258 } 259 } 260 popstackmark(&smark); /* unnecessary */ 261 } 262 263 264 265 /* 266 * Read /etc/profile or .profile. Return on error. 267 */ 268 269 STATIC void 270 read_profile(name) 271 char *name; 272 { 273 int fd; 274 275 INTOFF; 276 if ((fd = open(name, O_RDONLY)) >= 0) 277 setinputfd(fd, 1); 278 INTON; 279 if (fd < 0) 280 return; 281 cmdloop(0); 282 popfile(); 283 } 284 285 286 287 /* 288 * Read a file containing shell functions. 289 */ 290 291 void 292 readcmdfile(name) 293 char *name; 294 { 295 int fd; 296 297 INTOFF; 298 if ((fd = open(name, O_RDONLY)) >= 0) 299 setinputfd(fd, 1); 300 else 301 error("Can't open %s", name); 302 INTON; 303 cmdloop(0); 304 popfile(); 305 } 306 307 308 309 /* 310 * Take commands from a file. To be compatable we should do a path 311 * search for the file, which is necessary to find sub-commands. 312 */ 313 314 315 STATIC char * 316 find_dot_file(basename) 317 char *basename; 318 { 319 static char localname[FILENAME_MAX+1]; 320 char *fullname; 321 char *path = pathval(); 322 struct stat statb; 323 324 /* don't try this for absolute or relative paths */ 325 if( strchr(basename, '/')) 326 return basename; 327 328 while ((fullname = padvance(&path, basename)) != NULL) { 329 strcpy(localname, fullname); 330 stunalloc(fullname); 331 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 332 return localname; 333 } 334 return basename; 335 } 336 337 int 338 dotcmd(argc, argv) 339 int argc; 340 char **argv; 341 { 342 struct strlist *sp; 343 exitstatus = 0; 344 345 for (sp = cmdenviron; sp ; sp = sp->next) 346 setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); 347 348 if (argc >= 2) { /* That's what SVR2 does */ 349 char *fullname = find_dot_file(argv[1]); 350 351 setinputfile(fullname, 1); 352 commandname = fullname; 353 cmdloop(0); 354 popfile(); 355 } 356 return exitstatus; 357 } 358 359 360 int 361 exitcmd(argc, argv) 362 int argc; 363 char **argv; 364 { 365 extern int oexitstatus; 366 367 if (stoppedjobs()) 368 return 0; 369 if (argc > 1) 370 exitstatus = number(argv[1]); 371 else 372 exitstatus = oexitstatus; 373 exitshell(exitstatus); 374 /*NOTREACHED*/ 375 return 0; 376 } 377 378 379 #ifdef notdef 380 /* 381 * Should never be called. 382 */ 383 384 void 385 exit(exitstatus) { 386 _exit(exitstatus); 387 } 388 #endif 389