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(char *); 90 STATIC char *find_dot_file(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(int argc, char *argv[]) 102 { 103 struct jmploc jmploc; 104 struct stackmark smark; 105 volatile int state; 106 char *shinit; 107 108 #if PROFILE 109 monitor(4, etext, profile_buf, sizeof profile_buf, 50); 110 #endif 111 (void) setlocale(LC_ALL, ""); 112 state = 0; 113 if (setjmp(jmploc.loc)) { 114 /* 115 * When a shell procedure is executed, we raise the 116 * exception EXSHELLPROC to clean up before executing 117 * the shell procedure. 118 */ 119 switch (exception) { 120 case EXSHELLPROC: 121 rootpid = getpid(); 122 rootshell = 1; 123 minusc = NULL; 124 state = 3; 125 break; 126 127 case EXEXEC: 128 exitstatus = exerrno; 129 break; 130 131 case EXERROR: 132 exitstatus = 2; 133 break; 134 135 default: 136 break; 137 } 138 139 if (exception != EXSHELLPROC) { 140 if (state == 0 || iflag == 0 || ! rootshell) 141 exitshell(exitstatus); 142 } 143 reset(); 144 if (exception == EXINT 145 #if ATTY 146 && (! attyset() || equal(termval(), "emacs")) 147 #endif 148 ) { 149 out2c('\n'); 150 flushout(&errout); 151 } 152 popstackmark(&smark); 153 FORCEINTON; /* enable interrupts */ 154 if (state == 1) 155 goto state1; 156 else if (state == 2) 157 goto state2; 158 else if (state == 3) 159 goto state3; 160 else 161 goto state4; 162 } 163 handler = &jmploc; 164 #ifdef DEBUG 165 opentrace(); 166 trputs("Shell args: "); trargs(argv); 167 #endif 168 rootpid = getpid(); 169 rootshell = 1; 170 init(); 171 setstackmark(&smark); 172 procargs(argc, argv); 173 if (getpwd() == NULL && iflag) 174 out2str("sh: cannot determine working directory\n"); 175 if (argv[0] && argv[0][0] == '-') { 176 state = 1; 177 read_profile("/etc/profile"); 178 state1: 179 state = 2; 180 if (privileged == 0) 181 read_profile(".profile"); 182 else 183 read_profile("/etc/suid_profile"); 184 } 185 state2: 186 state = 3; 187 if (!privileged && iflag) { 188 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 189 state = 3; 190 read_profile(shinit); 191 } 192 } 193 state3: 194 state = 4; 195 if (minusc) { 196 evalstring(minusc); 197 } 198 if (sflag || minusc == NULL) { 199 state4: /* XXX ??? - why isn't this before the "if" statement */ 200 cmdloop(1); 201 } 202 #if PROFILE 203 monitor(0); 204 #endif 205 exitshell(exitstatus); 206 /*NOTREACHED*/ 207 return 0; 208 } 209 210 211 /* 212 * Read and execute commands. "Top" is nonzero for the top level command 213 * loop; it turns on prompting if the shell is interactive. 214 */ 215 216 void 217 cmdloop(int top) 218 { 219 union node *n; 220 struct stackmark smark; 221 int inter; 222 int numeof = 0; 223 224 TRACE(("cmdloop(%d) called\n", top)); 225 setstackmark(&smark); 226 for (;;) { 227 if (pendingsigs) 228 dotrap(); 229 inter = 0; 230 if (iflag && top) { 231 inter++; 232 showjobs(1); 233 chkmail(0); 234 flushout(&output); 235 } 236 n = parsecmd(inter); 237 /* showtree(n); DEBUG */ 238 if (n == NEOF) { 239 if (!top || numeof >= 50) 240 break; 241 if (!stoppedjobs()) { 242 if (!Iflag) 243 break; 244 out2str("\nUse \"exit\" to leave shell.\n"); 245 } 246 numeof++; 247 } else if (n != NULL && nflag == 0) { 248 job_warning = (job_warning == 2) ? 1 : 0; 249 numeof = 0; 250 evaltree(n, 0); 251 } 252 popstackmark(&smark); 253 setstackmark(&smark); 254 if (evalskip == SKIPFILE) { 255 evalskip = 0; 256 break; 257 } 258 } 259 popstackmark(&smark); 260 } 261 262 263 264 /* 265 * Read /etc/profile or .profile. Return on error. 266 */ 267 268 STATIC void 269 read_profile(char *name) 270 { 271 int fd; 272 273 INTOFF; 274 if ((fd = open(name, O_RDONLY)) >= 0) 275 setinputfd(fd, 1); 276 INTON; 277 if (fd < 0) 278 return; 279 cmdloop(0); 280 popfile(); 281 } 282 283 284 285 /* 286 * Read a file containing shell functions. 287 */ 288 289 void 290 readcmdfile(char *name) 291 { 292 int fd; 293 294 INTOFF; 295 if ((fd = open(name, O_RDONLY)) >= 0) 296 setinputfd(fd, 1); 297 else 298 error("Can't open %s: %s", name, strerror(errno)); 299 INTON; 300 cmdloop(0); 301 popfile(); 302 } 303 304 305 306 /* 307 * Take commands from a file. To be compatible we should do a path 308 * search for the file, which is necessary to find sub-commands. 309 */ 310 311 312 STATIC char * 313 find_dot_file(char *basename) 314 { 315 static char localname[FILENAME_MAX+1]; 316 char *fullname; 317 char *path = pathval(); 318 struct stat statb; 319 320 /* don't try this for absolute or relative paths */ 321 if( strchr(basename, '/')) 322 return basename; 323 324 while ((fullname = padvance(&path, basename)) != NULL) { 325 strcpy(localname, fullname); 326 stunalloc(fullname); 327 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 328 return localname; 329 } 330 return basename; 331 } 332 333 int 334 dotcmd(int argc, char **argv) 335 { 336 struct strlist *sp; 337 exitstatus = 0; 338 339 for (sp = cmdenviron; sp ; sp = sp->next) 340 setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); 341 342 if (argc >= 2) { /* That's what SVR2 does */ 343 char *fullname = find_dot_file(argv[1]); 344 345 setinputfile(fullname, 1); 346 commandname = fullname; 347 cmdloop(0); 348 popfile(); 349 } 350 return exitstatus; 351 } 352 353 354 int 355 exitcmd(int argc, char **argv) 356 { 357 extern int oexitstatus; 358 359 if (stoppedjobs()) 360 return 0; 361 if (argc > 1) 362 exitstatus = number(argv[1]); 363 else 364 exitstatus = oexitstatus; 365 exitshell(exitstatus); 366 /*NOTREACHED*/ 367 return 0; 368 } 369