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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 static char const copyright[] = 35 "@(#) Copyright (c) 1991, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/28/95"; 42 #endif 43 #endif /* not lint */ 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 #include <stdio.h> 48 #include <signal.h> 49 #include <sys/stat.h> 50 #include <unistd.h> 51 #include <fcntl.h> 52 #include <locale.h> 53 #include <errno.h> 54 55 #include "shell.h" 56 #include "main.h" 57 #include "mail.h" 58 #include "options.h" 59 #include "output.h" 60 #include "parser.h" 61 #include "nodes.h" 62 #include "expand.h" 63 #include "eval.h" 64 #include "jobs.h" 65 #include "input.h" 66 #include "trap.h" 67 #include "var.h" 68 #include "show.h" 69 #include "memalloc.h" 70 #include "error.h" 71 #include "init.h" 72 #include "mystring.h" 73 #include "exec.h" 74 #include "cd.h" 75 76 int rootpid; 77 int rootshell; 78 struct jmploc main_handler; 79 80 STATIC void read_profile(const char *); 81 STATIC char *find_dot_file(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 stackmark smark; 95 volatile int state; 96 char *shinit; 97 98 (void) setlocale(LC_ALL, ""); 99 state = 0; 100 if (setjmp(main_handler.loc)) { 101 /* 102 * When a shell procedure is executed, we raise the 103 * exception EXSHELLPROC to clean up before executing 104 * the shell procedure. 105 */ 106 switch (exception) { 107 case EXSHELLPROC: 108 rootpid = getpid(); 109 rootshell = 1; 110 minusc = NULL; 111 state = 3; 112 break; 113 114 case EXEXEC: 115 exitstatus = exerrno; 116 break; 117 118 case EXERROR: 119 exitstatus = 2; 120 break; 121 122 default: 123 break; 124 } 125 126 if (exception != EXSHELLPROC) { 127 if (state == 0 || iflag == 0 || ! rootshell) 128 exitshell(exitstatus); 129 } 130 reset(); 131 if (exception == EXINT) { 132 out2c('\n'); 133 flushout(&errout); 134 } 135 popstackmark(&smark); 136 FORCEINTON; /* enable interrupts */ 137 if (state == 1) 138 goto state1; 139 else if (state == 2) 140 goto state2; 141 else if (state == 3) 142 goto state3; 143 else 144 goto state4; 145 } 146 handler = &main_handler; 147 #ifdef DEBUG 148 opentrace(); 149 trputs("Shell args: "); trargs(argv); 150 #endif 151 rootpid = getpid(); 152 rootshell = 1; 153 init(); 154 setstackmark(&smark); 155 procargs(argc, argv); 156 if (getpwd() == NULL && iflag) 157 out2fmt_flush("sh: cannot determine working directory\n"); 158 if (getpwd() != NULL) 159 setvar ("PWD", getpwd(), VEXPORT); 160 if (iflag) 161 chkmail(1); 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, sflag ? 0 : EV_EXIT); 184 } 185 if (sflag || minusc == NULL) { 186 state4: /* XXX ??? - why isn't this before the "if" statement */ 187 cmdloop(1); 188 } 189 exitshell(exitstatus); 190 /*NOTREACHED*/ 191 return 0; 192 } 193 194 195 /* 196 * Read and execute commands. "Top" is nonzero for the top level command 197 * loop; it turns on prompting if the shell is interactive. 198 */ 199 200 void 201 cmdloop(int top) 202 { 203 union node *n; 204 struct stackmark smark; 205 int inter; 206 int numeof = 0; 207 208 TRACE(("cmdloop(%d) called\n", top)); 209 setstackmark(&smark); 210 for (;;) { 211 if (pendingsigs) 212 dotrap(); 213 inter = 0; 214 if (iflag && top) { 215 inter++; 216 showjobs(1, SHOWJOBS_DEFAULT); 217 chkmail(0); 218 flushout(&output); 219 } 220 n = parsecmd(inter); 221 /* showtree(n); DEBUG */ 222 if (n == NEOF) { 223 if (!top || numeof >= 50) 224 break; 225 if (!stoppedjobs()) { 226 if (!Iflag) 227 break; 228 out2fmt_flush("\nUse \"exit\" to leave shell.\n"); 229 } 230 numeof++; 231 } else if (n != NULL && nflag == 0) { 232 job_warning = (job_warning == 2) ? 1 : 0; 233 numeof = 0; 234 evaltree(n, 0); 235 } 236 popstackmark(&smark); 237 setstackmark(&smark); 238 if (evalskip == SKIPFILE) { 239 evalskip = 0; 240 break; 241 } 242 } 243 popstackmark(&smark); 244 } 245 246 247 248 /* 249 * Read /etc/profile or .profile. Return on error. 250 */ 251 252 STATIC void 253 read_profile(const char *name) 254 { 255 int fd; 256 257 INTOFF; 258 if ((fd = open(name, O_RDONLY)) >= 0) 259 setinputfd(fd, 1); 260 INTON; 261 if (fd < 0) 262 return; 263 cmdloop(0); 264 popfile(); 265 } 266 267 268 269 /* 270 * Read a file containing shell functions. 271 */ 272 273 void 274 readcmdfile(const char *name) 275 { 276 int fd; 277 278 INTOFF; 279 if ((fd = open(name, O_RDONLY)) >= 0) 280 setinputfd(fd, 1); 281 else 282 error("Can't open %s: %s", name, strerror(errno)); 283 INTON; 284 cmdloop(0); 285 popfile(); 286 } 287 288 289 290 /* 291 * Take commands from a file. To be compatible we should do a path 292 * search for the file, which is necessary to find sub-commands. 293 */ 294 295 296 STATIC char * 297 find_dot_file(char *basename) 298 { 299 static char localname[FILENAME_MAX+1]; 300 char *fullname; 301 const char *path = pathval(); 302 struct stat statb; 303 304 /* don't try this for absolute or relative paths */ 305 if( strchr(basename, '/')) 306 return basename; 307 308 while ((fullname = padvance(&path, basename)) != NULL) { 309 strcpy(localname, fullname); 310 stunalloc(fullname); 311 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 312 return localname; 313 } 314 return basename; 315 } 316 317 int 318 dotcmd(int argc, char **argv) 319 { 320 char *fullname; 321 322 if (argc < 2) 323 error("missing filename"); 324 325 exitstatus = 0; 326 327 fullname = find_dot_file(argv[1]); 328 setinputfile(fullname, 1); 329 commandname = fullname; 330 cmdloop(0); 331 popfile(); 332 return exitstatus; 333 } 334 335 336 int 337 exitcmd(int argc, char **argv) 338 { 339 if (stoppedjobs()) 340 return 0; 341 if (argc > 1) 342 exitstatus = number(argv[1]); 343 else 344 exitstatus = oexitstatus; 345 exitshell(exitstatus); 346 /*NOTREACHED*/ 347 return 0; 348 } 349