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 * @(#) Copyright (c) 1991, 1993 The Regents of the University of California. All rights reserved. 37 * @(#)main.c 8.6 (Berkeley) 5/28/95 38 * $FreeBSD: src/bin/sh/main.c,v 1.18.2.3 2002/07/19 04:38:51 tjr Exp $ 39 * $DragonFly: src/bin/sh/main.c,v 1.3 2004/03/19 18:39:41 cpressey Exp $ 40 */ 41 42 #include <stdio.h> 43 #include <signal.h> 44 #include <sys/stat.h> 45 #include <unistd.h> 46 #include <fcntl.h> 47 #include <locale.h> 48 #include <errno.h> 49 50 #include "shell.h" 51 #include "main.h" 52 #include "mail.h" 53 #include "options.h" 54 #include "output.h" 55 #include "parser.h" 56 #include "nodes.h" 57 #include "expand.h" 58 #include "eval.h" 59 #include "jobs.h" 60 #include "input.h" 61 #include "trap.h" 62 #include "var.h" 63 #include "show.h" 64 #include "memalloc.h" 65 #include "error.h" 66 #include "init.h" 67 #include "mystring.h" 68 #include "exec.h" 69 #include "cd.h" 70 71 #define PROFILE 0 72 73 int rootpid; 74 int rootshell; 75 #if PROFILE 76 short profile_buf[16384]; 77 extern int etext(); 78 #endif 79 80 STATIC void read_profile(const char *); 81 STATIC const char *find_dot_file(const char *); 82 83 /* 84 * Main routine. We initialize things, parse the arguments, execute 85 * profiles if we're a login shell, and then call cmdloop to execute 86 * commands. The setjmp call sets up the location to jump to when an 87 * exception occurs. When an exception occurs the variable "state" 88 * is used to figure out how far we had gotten. 89 */ 90 91 int 92 main(int argc, char *argv[]) 93 { 94 struct jmploc jmploc; 95 struct stackmark smark; 96 volatile int state; 97 char *shinit; 98 99 #if PROFILE 100 monitor(4, etext, profile_buf, sizeof profile_buf, 50); 101 #endif 102 (void) setlocale(LC_ALL, ""); 103 state = 0; 104 if (setjmp(jmploc.loc)) { 105 /* 106 * When a shell procedure is executed, we raise the 107 * exception EXSHELLPROC to clean up before executing 108 * the shell procedure. 109 */ 110 switch (exception) { 111 case EXSHELLPROC: 112 rootpid = getpid(); 113 rootshell = 1; 114 minusc = NULL; 115 state = 3; 116 break; 117 118 case EXEXEC: 119 exitstatus = exerrno; 120 break; 121 122 case EXERROR: 123 exitstatus = 2; 124 break; 125 126 default: 127 break; 128 } 129 130 if (exception != EXSHELLPROC) { 131 if (state == 0 || iflag == 0 || ! rootshell) 132 exitshell(exitstatus); 133 } 134 reset(); 135 if (exception == EXINT 136 #if ATTY 137 && (! attyset() || equal(termval(), "emacs")) 138 #endif 139 ) { 140 out2c('\n'); 141 flushout(&errout); 142 } 143 popstackmark(&smark); 144 FORCEINTON; /* enable interrupts */ 145 if (state == 1) 146 goto state1; 147 else if (state == 2) 148 goto state2; 149 else if (state == 3) 150 goto state3; 151 else 152 goto state4; 153 } 154 handler = &jmploc; 155 #ifdef DEBUG 156 opentrace(); 157 trputs("Shell args: "); trargs(argv); 158 #endif 159 rootpid = getpid(); 160 rootshell = 1; 161 init(); 162 setstackmark(&smark); 163 procargs(argc, argv); 164 if (getpwd() == NULL && iflag) 165 out2str("sh: cannot determine working directory\n"); 166 if (argv[0] && argv[0][0] == '-') { 167 state = 1; 168 read_profile("/etc/profile"); 169 state1: 170 state = 2; 171 if (privileged == 0) 172 read_profile(".profile"); 173 else 174 read_profile("/etc/suid_profile"); 175 } 176 state2: 177 state = 3; 178 if (!privileged && iflag) { 179 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 180 state = 3; 181 read_profile(shinit); 182 } 183 } 184 state3: 185 state = 4; 186 if (minusc) { 187 evalstring(minusc); 188 } 189 if (sflag || minusc == NULL) { 190 state4: /* XXX ??? - why isn't this before the "if" statement */ 191 cmdloop(1); 192 } 193 #if PROFILE 194 monitor(0); 195 #endif 196 exitshell(exitstatus); 197 /*NOTREACHED*/ 198 return 0; 199 } 200 201 202 /* 203 * Read and execute commands. "Top" is nonzero for the top level command 204 * loop; it turns on prompting if the shell is interactive. 205 */ 206 207 void 208 cmdloop(int top) 209 { 210 union node *n; 211 struct stackmark smark; 212 int inter; 213 int numeof = 0; 214 215 TRACE(("cmdloop(%d) called\n", top)); 216 setstackmark(&smark); 217 for (;;) { 218 if (pendingsigs) 219 dotrap(); 220 inter = 0; 221 if (iflag && top) { 222 inter++; 223 showjobs(1, 0, 0); 224 chkmail(0); 225 flushout(&output); 226 } 227 n = parsecmd(inter); 228 /* showtree(n); DEBUG */ 229 if (n == NEOF) { 230 if (!top || numeof >= 50) 231 break; 232 if (!stoppedjobs()) { 233 if (!Iflag) 234 break; 235 out2str("\nUse \"exit\" to leave shell.\n"); 236 } 237 numeof++; 238 } else if (n != NULL && nflag == 0) { 239 job_warning = (job_warning == 2) ? 1 : 0; 240 numeof = 0; 241 evaltree(n, 0); 242 } 243 popstackmark(&smark); 244 setstackmark(&smark); 245 if (evalskip == SKIPFILE) { 246 evalskip = 0; 247 break; 248 } 249 } 250 popstackmark(&smark); 251 } 252 253 254 255 /* 256 * Read /etc/profile or .profile. Return on error. 257 */ 258 259 STATIC void 260 read_profile(const char *name) 261 { 262 int fd; 263 264 INTOFF; 265 if ((fd = open(name, O_RDONLY)) >= 0) 266 setinputfd(fd, 1); 267 INTON; 268 if (fd < 0) 269 return; 270 cmdloop(0); 271 popfile(); 272 } 273 274 275 276 /* 277 * Read a file containing shell functions. 278 */ 279 280 void 281 readcmdfile(char *name) 282 { 283 int fd; 284 285 INTOFF; 286 if ((fd = open(name, O_RDONLY)) >= 0) 287 setinputfd(fd, 1); 288 else 289 error("Can't open %s: %s", name, strerror(errno)); 290 INTON; 291 cmdloop(0); 292 popfile(); 293 } 294 295 296 297 /* 298 * Take commands from a file. To be compatible we should do a path 299 * search for the file, which is necessary to find sub-commands. 300 */ 301 302 303 STATIC const char * 304 find_dot_file(const char *basename) 305 { 306 static char localname[FILENAME_MAX+1]; 307 char *fullname; 308 const char *path = pathval(); 309 struct stat statb; 310 311 /* don't try this for absolute or relative paths */ 312 if( strchr(basename, '/')) 313 return basename; 314 315 while ((fullname = padvance(&path, basename)) != NULL) { 316 strcpy(localname, fullname); 317 stunalloc(fullname); 318 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 319 return localname; 320 } 321 return basename; 322 } 323 324 int 325 dotcmd(int argc, char **argv) 326 { 327 struct strlist *sp; 328 exitstatus = 0; 329 330 for (sp = cmdenviron; sp ; sp = sp->next) 331 setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); 332 333 if (argc >= 2) { /* That's what SVR2 does */ 334 const char *fullname = find_dot_file(argv[1]); 335 336 setinputfile(fullname, 1); 337 commandname = fullname; 338 cmdloop(0); 339 popfile(); 340 } 341 return exitstatus; 342 } 343 344 345 int 346 exitcmd(int argc, char **argv) 347 { 348 extern int oexitstatus; 349 350 if (stoppedjobs()) 351 return 0; 352 if (argc > 1) 353 exitstatus = number(argv[1]); 354 else 355 exitstatus = oexitstatus; 356 exitshell(exitstatus); 357 /*NOTREACHED*/ 358 return 0; 359 } 360