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 37 #ifndef lint 38 static char const copyright[] = 39 "@(#) Copyright (c) 1991, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/28/95"; 46 #endif 47 static const char rcsid[] = 48 "$FreeBSD$"; 49 #endif /* not lint */ 50 51 #include <stdio.h> 52 #include <signal.h> 53 #include <sys/stat.h> 54 #include <unistd.h> 55 #include <fcntl.h> 56 #include <locale.h> 57 #include <errno.h> 58 59 #include "shell.h" 60 #include "main.h" 61 #include "mail.h" 62 #include "options.h" 63 #include "output.h" 64 #include "parser.h" 65 #include "nodes.h" 66 #include "expand.h" 67 #include "eval.h" 68 #include "jobs.h" 69 #include "input.h" 70 #include "trap.h" 71 #include "var.h" 72 #include "show.h" 73 #include "memalloc.h" 74 #include "error.h" 75 #include "init.h" 76 #include "mystring.h" 77 #include "exec.h" 78 #include "cd.h" 79 80 #define PROFILE 0 81 82 int rootpid; 83 int rootshell; 84 #if PROFILE 85 short profile_buf[16384]; 86 extern int etext(); 87 #endif 88 89 STATIC void read_profile __P((char *)); 90 STATIC char *find_dot_file __P((char *)); 91 92 /* 93 * Main routine. We initialize things, parse the arguments, execute 94 * profiles if we're a login shell, and then call cmdloop to execute 95 * commands. The setjmp call sets up the location to jump to when an 96 * exception occurs. When an exception occurs the variable "state" 97 * is used to figure out how far we had gotten. 98 */ 99 100 int 101 main(argc, argv) 102 int argc; 103 char **argv; 104 { 105 struct jmploc jmploc; 106 struct stackmark smark; 107 volatile int state; 108 char *shinit; 109 110 #if PROFILE 111 monitor(4, etext, profile_buf, sizeof profile_buf, 50); 112 #endif 113 (void) setlocale(LC_ALL, ""); 114 state = 0; 115 if (setjmp(jmploc.loc)) { 116 /* 117 * When a shell procedure is executed, we raise the 118 * exception EXSHELLPROC to clean up before executing 119 * the shell procedure. 120 */ 121 switch (exception) { 122 case EXSHELLPROC: 123 rootpid = getpid(); 124 rootshell = 1; 125 minusc = NULL; 126 state = 3; 127 break; 128 129 case EXEXEC: 130 exitstatus = exerrno; 131 break; 132 133 case EXERROR: 134 exitstatus = 2; 135 break; 136 137 default: 138 break; 139 } 140 141 if (exception != EXSHELLPROC) { 142 if (state == 0 || iflag == 0 || ! rootshell) 143 exitshell(exitstatus); 144 } 145 reset(); 146 if (exception == EXINT 147 #if ATTY 148 && (! attyset() || equal(termval(), "emacs")) 149 #endif 150 ) { 151 out2c('\n'); 152 flushout(&errout); 153 } 154 popstackmark(&smark); 155 FORCEINTON; /* enable interrupts */ 156 if (state == 1) 157 goto state1; 158 else if (state == 2) 159 goto state2; 160 else if (state == 3) 161 goto state3; 162 else 163 goto state4; 164 } 165 handler = &jmploc; 166 #ifdef DEBUG 167 opentrace(); 168 trputs("Shell args: "); trargs(argv); 169 #endif 170 rootpid = getpid(); 171 rootshell = 1; 172 init(); 173 setstackmark(&smark); 174 procargs(argc, argv); 175 if (getpwd() == NULL && iflag) 176 out2str("sh: cannot determine working directory\n"); 177 if (argv[0] && argv[0][0] == '-') { 178 state = 1; 179 read_profile("/etc/profile"); 180 state1: 181 state = 2; 182 if (privileged == 0) 183 read_profile(".profile"); 184 else 185 read_profile("/etc/suid_profile"); 186 } 187 state2: 188 state = 3; 189 if (!privileged && iflag) { 190 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 191 state = 3; 192 read_profile(shinit); 193 } 194 } 195 state3: 196 state = 4; 197 if (minusc) { 198 evalstring(minusc); 199 } 200 if (sflag || minusc == NULL) { 201 state4: /* XXX ??? - why isn't this before the "if" statement */ 202 cmdloop(1); 203 } 204 #if PROFILE 205 monitor(0); 206 #endif 207 exitshell(exitstatus); 208 /*NOTREACHED*/ 209 return 0; 210 } 211 212 213 /* 214 * Read and execute commands. "Top" is nonzero for the top level command 215 * loop; it turns on prompting if the shell is interactive. 216 */ 217 218 void 219 cmdloop(top) 220 int top; 221 { 222 union node *n; 223 struct stackmark smark; 224 int inter; 225 int numeof = 0; 226 227 TRACE(("cmdloop(%d) called\n", top)); 228 setstackmark(&smark); 229 for (;;) { 230 if (pendingsigs) 231 dotrap(); 232 inter = 0; 233 if (iflag && top) { 234 inter++; 235 showjobs(1); 236 chkmail(0); 237 flushout(&output); 238 } 239 n = parsecmd(inter); 240 /* showtree(n); DEBUG */ 241 if (n == NEOF) { 242 if (!top || numeof >= 50) 243 break; 244 if (!stoppedjobs()) { 245 if (!Iflag) 246 break; 247 out2str("\nUse \"exit\" to leave shell.\n"); 248 } 249 numeof++; 250 } else if (n != NULL && nflag == 0) { 251 job_warning = (job_warning == 2) ? 1 : 0; 252 numeof = 0; 253 evaltree(n, 0); 254 } 255 popstackmark(&smark); 256 setstackmark(&smark); 257 if (evalskip == SKIPFILE) { 258 evalskip = 0; 259 break; 260 } 261 } 262 popstackmark(&smark); 263 } 264 265 266 267 /* 268 * Read /etc/profile or .profile. Return on error. 269 */ 270 271 STATIC void 272 read_profile(name) 273 char *name; 274 { 275 int fd; 276 277 INTOFF; 278 if ((fd = open(name, O_RDONLY)) >= 0) 279 setinputfd(fd, 1); 280 INTON; 281 if (fd < 0) 282 return; 283 cmdloop(0); 284 popfile(); 285 } 286 287 288 289 /* 290 * Read a file containing shell functions. 291 */ 292 293 void 294 readcmdfile(name) 295 char *name; 296 { 297 int fd; 298 299 INTOFF; 300 if ((fd = open(name, O_RDONLY)) >= 0) 301 setinputfd(fd, 1); 302 else 303 error("Can't open %s: %s", name, strerror(errno)); 304 INTON; 305 cmdloop(0); 306 popfile(); 307 } 308 309 310 311 /* 312 * Take commands from a file. To be compatible we should do a path 313 * search for the file, which is necessary to find sub-commands. 314 */ 315 316 317 STATIC char * 318 find_dot_file(basename) 319 char *basename; 320 { 321 static char localname[FILENAME_MAX+1]; 322 char *fullname; 323 char *path = pathval(); 324 struct stat statb; 325 326 /* don't try this for absolute or relative paths */ 327 if( strchr(basename, '/')) 328 return basename; 329 330 while ((fullname = padvance(&path, basename)) != NULL) { 331 strcpy(localname, fullname); 332 stunalloc(fullname); 333 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 334 return localname; 335 } 336 return basename; 337 } 338 339 int 340 dotcmd(argc, argv) 341 int argc; 342 char **argv; 343 { 344 struct strlist *sp; 345 exitstatus = 0; 346 347 for (sp = cmdenviron; sp ; sp = sp->next) 348 setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); 349 350 if (argc >= 2) { /* That's what SVR2 does */ 351 char *fullname = find_dot_file(argv[1]); 352 353 setinputfile(fullname, 1); 354 commandname = fullname; 355 cmdloop(0); 356 popfile(); 357 } 358 return exitstatus; 359 } 360 361 362 int 363 exitcmd(argc, argv) 364 int argc; 365 char **argv; 366 { 367 extern int oexitstatus; 368 369 if (stoppedjobs()) 370 return 0; 371 if (argc > 1) 372 exitstatus = number(argv[1]); 373 else 374 exitstatus = oexitstatus; 375 exitshell(exitstatus); 376 /*NOTREACHED*/ 377 return 0; 378 } 379 380 381 #ifdef notdef 382 /* 383 * Should never be called. 384 */ 385 386 void 387 exit(exitstatus) { 388 _exit(exitstatus); 389 } 390 #endif 391