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: main.c,v 1.7 1996/09/12 02:23:33 bde Exp $ 37 */ 38 39 #ifndef lint 40 static char 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 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 77 #define PROFILE 0 78 79 int rootpid; 80 int rootshell; 81 STATIC union node *curcmd; 82 STATIC union node *prevcmd; 83 extern int errno; 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 if (exception == EXERROR) 122 exitstatus = 2; 123 if (exception == EXSHELLPROC) { 124 rootpid = getpid(); 125 rootshell = 1; 126 minusc = NULL; 127 state = 3; 128 } else if (state == 0 || iflag == 0 || ! rootshell) 129 exitshell(2); 130 reset(); 131 if (exception == EXINT 132 #if ATTY 133 && (! attyset() || equal(termval(), "emacs")) 134 #endif 135 ) { 136 out2c('\n'); 137 flushout(&errout); 138 } 139 popstackmark(&smark); 140 FORCEINTON; /* enable interrupts */ 141 if (state == 1) 142 goto state1; 143 else if (state == 2) 144 goto state2; 145 else if (state == 3) 146 goto state3; 147 else 148 goto state4; 149 } 150 handler = &jmploc; 151 #ifdef DEBUG 152 opentrace(); 153 trputs("Shell args: "); trargs(argv); 154 #endif 155 rootpid = getpid(); 156 rootshell = 1; 157 init(); 158 setstackmark(&smark); 159 procargs(argc, argv); 160 if (argv[0] && argv[0][0] == '-') { 161 state = 1; 162 read_profile("/etc/profile"); 163 state1: 164 state = 2; 165 read_profile(".profile"); 166 } 167 state2: 168 state = 3; 169 if (getuid() == geteuid() && getgid() == getegid()) { 170 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 171 state = 3; 172 read_profile(shinit); 173 } 174 } 175 state3: 176 state = 4; 177 if (minusc) { 178 evalstring(minusc); 179 } 180 if (sflag || minusc == NULL) { 181 state4: /* XXX ??? - why isn't this before the "if" statement */ 182 cmdloop(1); 183 } 184 #if PROFILE 185 monitor(0); 186 #endif 187 exitshell(exitstatus); 188 /*NOTREACHED*/ 189 return 0; 190 } 191 192 193 /* 194 * Read and execute commands. "Top" is nonzero for the top level command 195 * loop; it turns on prompting if the shell is interactive. 196 */ 197 198 void 199 cmdloop(top) 200 int top; 201 { 202 union node *n; 203 struct stackmark smark; 204 int inter; 205 int numeof = 0; 206 207 TRACE(("cmdloop(%d) called\n", top)); 208 setstackmark(&smark); 209 for (;;) { 210 if (pendingsigs) 211 dotrap(); 212 inter = 0; 213 if (iflag && top) { 214 inter++; 215 showjobs(1); 216 chkmail(0); 217 flushout(&output); 218 } 219 n = parsecmd(inter); 220 /* showtree(n); DEBUG */ 221 if (n == NEOF) { 222 if (!top || numeof >= 50) 223 break; 224 if (!stoppedjobs()) { 225 if (!Iflag) 226 break; 227 out2str("\nUse \"exit\" to leave shell.\n"); 228 } 229 numeof++; 230 } else if (n != NULL && nflag == 0) { 231 job_warning = (job_warning == 2) ? 1 : 0; 232 numeof = 0; 233 evaltree(n, 0); 234 } 235 popstackmark(&smark); 236 } 237 popstackmark(&smark); /* unnecessary */ 238 } 239 240 241 242 /* 243 * Read /etc/profile or .profile. Return on error. 244 */ 245 246 STATIC void 247 read_profile(name) 248 char *name; 249 { 250 int fd; 251 252 INTOFF; 253 if ((fd = open(name, O_RDONLY)) >= 0) 254 setinputfd(fd, 1); 255 INTON; 256 if (fd < 0) 257 return; 258 cmdloop(0); 259 popfile(); 260 } 261 262 263 264 /* 265 * Read a file containing shell functions. 266 */ 267 268 void 269 readcmdfile(name) 270 char *name; 271 { 272 int fd; 273 274 INTOFF; 275 if ((fd = open(name, O_RDONLY)) >= 0) 276 setinputfd(fd, 1); 277 else 278 error("Can't open %s", name); 279 INTON; 280 cmdloop(0); 281 popfile(); 282 } 283 284 285 286 /* 287 * Take commands from a file. To be compatable we should do a path 288 * search for the file, which is necessary to find sub-commands. 289 */ 290 291 292 STATIC char * 293 find_dot_file(basename) 294 char *basename; 295 { 296 static char localname[FILENAME_MAX+1]; 297 char *fullname; 298 char *path = pathval(); 299 struct stat statb; 300 301 /* don't try this for absolute or relative paths */ 302 if( strchr(basename, '/')) 303 return basename; 304 305 while ((fullname = padvance(&path, basename)) != NULL) { 306 strcpy(localname, fullname); 307 stunalloc(fullname); 308 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 309 return localname; 310 } 311 return basename; 312 } 313 314 int 315 dotcmd(argc, argv) 316 int argc; 317 char **argv; 318 { 319 struct strlist *sp; 320 exitstatus = 0; 321 322 for (sp = cmdenviron; sp ; sp = sp->next) 323 setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); 324 325 if (argc >= 2) { /* That's what SVR2 does */ 326 char *fullname = find_dot_file(argv[1]); 327 328 setinputfile(fullname, 1); 329 commandname = fullname; 330 cmdloop(0); 331 popfile(); 332 } 333 return exitstatus; 334 } 335 336 337 int 338 exitcmd(argc, argv) 339 int argc; 340 char **argv; 341 { 342 extern int oexitstatus; 343 344 if (stoppedjobs()) 345 return 0; 346 exitstatus = (argc > 1) ? number(argv[1]) : oexitstatus; 347 exitshell(exitstatus); 348 /*NOTREACHED*/ 349 return 0; 350 } 351 352 353 #ifdef notdef 354 /* 355 * Should never be called. 356 */ 357 358 void 359 exit(exitstatus) { 360 _exit(exitstatus); 361 } 362 #endif 363