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 1.29 2006/10/07 16:51:16 stefanf Exp $ 39 * $DragonFly: src/bin/sh/main.c,v 1.8 2007/01/13 23:36:14 pavalos 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 int rootpid; 72 int rootshell; 73 74 STATIC void read_profile(const char *); 75 STATIC const char *find_dot_file(const char *); 76 77 extern int oexitstatus; 78 79 /* 80 * Main routine. We initialize things, parse the arguments, execute 81 * profiles if we're a login shell, and then call cmdloop to execute 82 * commands. The setjmp call sets up the location to jump to when an 83 * exception occurs. When an exception occurs the variable "state" 84 * is used to figure out how far we had gotten. 85 */ 86 87 int 88 main(int argc, char *argv[]) 89 { 90 struct jmploc jmploc; 91 struct stackmark smark; 92 volatile int state; 93 char *shinit; 94 95 setlocale(LC_ALL, ""); 96 state = 0; 97 if (setjmp(jmploc.loc)) { 98 /* 99 * When a shell procedure is executed, we raise the 100 * exception EXSHELLPROC to clean up before executing 101 * the shell procedure. 102 */ 103 switch (exception) { 104 case EXSHELLPROC: 105 rootpid = getpid(); 106 rootshell = 1; 107 minusc = NULL; 108 state = 3; 109 break; 110 111 case EXEXEC: 112 exitstatus = exerrno; 113 break; 114 115 case EXERROR: 116 exitstatus = 2; 117 break; 118 119 default: 120 break; 121 } 122 123 if (exception != EXSHELLPROC) { 124 if (state == 0 || iflag == 0 || ! rootshell) 125 exitshell(exitstatus); 126 } 127 reset(); 128 if (exception == EXINT) { 129 out2c('\n'); 130 flushout(&errout); 131 } 132 popstackmark(&smark); 133 FORCEINTON; /* enable interrupts */ 134 if (state == 1) 135 goto state1; 136 else if (state == 2) 137 goto state2; 138 else if (state == 3) 139 goto state3; 140 else 141 goto state4; 142 } 143 handler = &jmploc; 144 #ifdef DEBUG 145 opentrace(); 146 trputs("Shell args: "); trargs(argv); 147 #endif 148 rootpid = getpid(); 149 rootshell = 1; 150 init(); 151 setstackmark(&smark); 152 procargs(argc, argv); 153 if (getpwd() == NULL && iflag) 154 out2str("sh: cannot determine working directory\n"); 155 if (getpwd() != NULL) 156 setvar ("PWD", getpwd(), VEXPORT); 157 if (argv[0] && argv[0][0] == '-') { 158 state = 1; 159 read_profile("/etc/profile"); 160 state1: 161 state = 2; 162 if (privileged == 0) 163 read_profile(".profile"); 164 else 165 read_profile("/etc/suid_profile"); 166 } 167 state2: 168 state = 3; 169 if (!privileged && iflag) { 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 exitshell(exitstatus); 185 /*NOTREACHED*/ 186 return 0; 187 } 188 189 190 /* 191 * Read and execute commands. "Top" is nonzero for the top level command 192 * loop; it turns on prompting if the shell is interactive. 193 */ 194 195 void 196 cmdloop(int top) 197 { 198 union node *n; 199 struct stackmark smark; 200 int inter; 201 int numeof = 0; 202 203 TRACE(("cmdloop(%d) called\n", top)); 204 setstackmark(&smark); 205 for (;;) { 206 if (pendingsigs) 207 dotrap(); 208 inter = 0; 209 if (iflag && top) { 210 inter++; 211 showjobs(1, SHOWJOBS_DEFAULT); 212 chkmail(0); 213 flushout(&output); 214 } 215 n = parsecmd(inter); 216 /* showtree(n); DEBUG */ 217 if (n == NEOF) { 218 if (!top || numeof >= 50) 219 break; 220 if (!stoppedjobs()) { 221 if (!Iflag) 222 break; 223 out2str("\nUse \"exit\" to leave shell.\n"); 224 } 225 numeof++; 226 } else if (n != NULL && nflag == 0) { 227 job_warning = (job_warning == 2) ? 1 : 0; 228 numeof = 0; 229 evaltree(n, 0); 230 } 231 popstackmark(&smark); 232 setstackmark(&smark); 233 if (evalskip == SKIPFILE) { 234 evalskip = 0; 235 break; 236 } 237 } 238 popstackmark(&smark); 239 } 240 241 242 243 /* 244 * Read /etc/profile or .profile. Return on error. 245 */ 246 247 STATIC void 248 read_profile(const 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(char *name) 270 { 271 int fd; 272 273 INTOFF; 274 if ((fd = open(name, O_RDONLY)) >= 0) 275 setinputfd(fd, 1); 276 else 277 error("Can't open %s: %s", name, strerror(errno)); 278 INTON; 279 cmdloop(0); 280 popfile(); 281 } 282 283 284 285 /* 286 * Take commands from a file. To be compatible we should do a path 287 * search for the file, which is necessary to find sub-commands. 288 */ 289 290 291 STATIC const char * 292 find_dot_file(const char *basename) 293 { 294 static char localname[FILENAME_MAX+1]; 295 char *fullname; 296 const char *path = pathval(); 297 struct stat statb; 298 299 /* don't try this for absolute or relative paths */ 300 if( strchr(basename, '/')) 301 return basename; 302 303 while ((fullname = padvance(&path, basename)) != NULL) { 304 strcpy(localname, fullname); 305 stunalloc(fullname); 306 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 307 return localname; 308 } 309 return basename; 310 } 311 312 int 313 dotcmd(int argc, char **argv) 314 { 315 struct strlist *sp; 316 const char *fullname; 317 318 if (argc < 2) 319 error("missing filename"); 320 321 exitstatus = 0; 322 323 for (sp = cmdenviron; sp ; sp = sp->next) 324 setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); 325 326 fullname = find_dot_file(argv[1]); 327 setinputfile(fullname, 1); 328 commandname = fullname; 329 cmdloop(0); 330 popfile(); 331 return exitstatus; 332 } 333 334 335 int 336 exitcmd(int argc, char **argv) 337 { 338 if (stoppedjobs()) 339 return 0; 340 if (argc > 1) 341 exitstatus = number(argv[1]); 342 else 343 exitstatus = oexitstatus; 344 exitshell(exitstatus); 345 /*NOTREACHED*/ 346 return 0; 347 } 348