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 1.5 2004/11/07 20:54:52 eirikn 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 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 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 (getpwd() == NULL && iflag) 161 out2str("sh: cannot determine working directory\n"); 162 if (argv[0] && argv[0][0] == '-') { 163 state = 1; 164 read_profile("/etc/profile"); 165 state1: 166 state = 2; 167 if (privileged == 0) 168 read_profile(".profile"); 169 else 170 read_profile("/etc/suid_profile"); 171 } 172 state2: 173 state = 3; 174 if (!privileged && iflag) { 175 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 176 state = 3; 177 read_profile(shinit); 178 } 179 } 180 state3: 181 state = 4; 182 if (minusc) { 183 evalstring(minusc); 184 } 185 if (sflag || minusc == NULL) { 186 state4: /* XXX ??? - why isn't this before the "if" statement */ 187 cmdloop(1); 188 } 189 #if PROFILE 190 monitor(0); 191 #endif 192 exitshell(exitstatus); 193 /*NOTREACHED*/ 194 return 0; 195 } 196 197 198 /* 199 * Read and execute commands. "Top" is nonzero for the top level command 200 * loop; it turns on prompting if the shell is interactive. 201 */ 202 203 void 204 cmdloop(int top) 205 { 206 union node *n; 207 struct stackmark smark; 208 int inter; 209 int numeof = 0; 210 211 TRACE(("cmdloop(%d) called\n", top)); 212 setstackmark(&smark); 213 for (;;) { 214 if (pendingsigs) 215 dotrap(); 216 inter = 0; 217 if (iflag && top) { 218 inter++; 219 showjobs(1, 0, 0); 220 chkmail(0); 221 flushout(&output); 222 } 223 n = parsecmd(inter); 224 /* showtree(n); DEBUG */ 225 if (n == NEOF) { 226 if (!top || numeof >= 50) 227 break; 228 if (!stoppedjobs()) { 229 if (!Iflag) 230 break; 231 out2str("\nUse \"exit\" to leave shell.\n"); 232 } 233 numeof++; 234 } else if (n != NULL && nflag == 0) { 235 job_warning = (job_warning == 2) ? 1 : 0; 236 numeof = 0; 237 evaltree(n, 0); 238 } 239 popstackmark(&smark); 240 setstackmark(&smark); 241 if (evalskip == SKIPFILE) { 242 evalskip = 0; 243 break; 244 } 245 } 246 popstackmark(&smark); 247 } 248 249 250 251 /* 252 * Read /etc/profile or .profile. Return on error. 253 */ 254 255 STATIC void 256 read_profile(const char *name) 257 { 258 int fd; 259 260 INTOFF; 261 if ((fd = open(name, O_RDONLY)) >= 0) 262 setinputfd(fd, 1); 263 INTON; 264 if (fd < 0) 265 return; 266 cmdloop(0); 267 popfile(); 268 } 269 270 271 272 /* 273 * Read a file containing shell functions. 274 */ 275 276 void 277 readcmdfile(char *name) 278 { 279 int fd; 280 281 INTOFF; 282 if ((fd = open(name, O_RDONLY)) >= 0) 283 setinputfd(fd, 1); 284 else 285 error("Can't open %s: %s", name, strerror(errno)); 286 INTON; 287 cmdloop(0); 288 popfile(); 289 } 290 291 292 293 /* 294 * Take commands from a file. To be compatible we should do a path 295 * search for the file, which is necessary to find sub-commands. 296 */ 297 298 299 STATIC const char * 300 find_dot_file(const char *basename) 301 { 302 static char localname[FILENAME_MAX+1]; 303 char *fullname; 304 const char *path = pathval(); 305 struct stat statb; 306 307 /* don't try this for absolute or relative paths */ 308 if( strchr(basename, '/')) 309 return basename; 310 311 while ((fullname = padvance(&path, basename)) != NULL) { 312 strcpy(localname, fullname); 313 stunalloc(fullname); 314 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 315 return localname; 316 } 317 return basename; 318 } 319 320 int 321 dotcmd(int argc, char **argv) 322 { 323 struct strlist *sp; 324 exitstatus = 0; 325 326 for (sp = cmdenviron; sp ; sp = sp->next) 327 setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); 328 329 if (argc >= 2) { /* That's what SVR2 does */ 330 const char *fullname = find_dot_file(argv[1]); 331 332 setinputfile(fullname, 1); 333 commandname = fullname; 334 cmdloop(0); 335 popfile(); 336 } 337 return exitstatus; 338 } 339 340 341 int 342 exitcmd(int argc, char **argv) 343 { 344 extern int oexitstatus; 345 346 if (stoppedjobs()) 347 return 0; 348 if (argc > 1) 349 exitstatus = number(argv[1]); 350 else 351 exitstatus = oexitstatus; 352 exitshell(exitstatus); 353 /*NOTREACHED*/ 354 return 0; 355 } 356