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 #include "builtins.h" 76 77 int rootpid; 78 int rootshell; 79 struct jmploc main_handler; 80 int localeisutf8, initial_localeisutf8; 81 82 static void cmdloop(int); 83 static void read_profile(const char *); 84 static char *find_dot_file(char *); 85 86 /* 87 * Main routine. We initialize things, parse the arguments, execute 88 * profiles if we're a login shell, and then call cmdloop to execute 89 * commands. The setjmp call sets up the location to jump to when an 90 * exception occurs. When an exception occurs the variable "state" 91 * is used to figure out how far we had gotten. 92 */ 93 94 int 95 main(int argc, char *argv[]) 96 { 97 struct stackmark smark, smark2; 98 volatile int state; 99 char *shinit; 100 101 (void) setlocale(LC_ALL, ""); 102 initcharset(); 103 state = 0; 104 if (setjmp(main_handler.loc)) { 105 switch (exception) { 106 case EXEXEC: 107 exitstatus = exerrno; 108 break; 109 110 case EXERROR: 111 exitstatus = 2; 112 break; 113 114 default: 115 break; 116 } 117 118 if (state == 0 || iflag == 0 || ! rootshell || 119 exception == EXEXIT) 120 exitshell(exitstatus); 121 reset(); 122 if (exception == EXINT) 123 out2fmt_flush("\n"); 124 popstackmark(&smark); 125 FORCEINTON; /* enable interrupts */ 126 if (state == 1) 127 goto state1; 128 else if (state == 2) 129 goto state2; 130 else if (state == 3) 131 goto state3; 132 else 133 goto state4; 134 } 135 handler = &main_handler; 136 #ifdef DEBUG 137 opentrace(); 138 trputs("Shell args: "); trargs(argv); 139 #endif 140 rootpid = getpid(); 141 rootshell = 1; 142 initvar(); 143 setstackmark(&smark); 144 setstackmark(&smark2); 145 procargs(argc, argv); 146 pwd_init(iflag); 147 if (iflag) 148 chkmail(1); 149 if (argv[0] && argv[0][0] == '-') { 150 state = 1; 151 read_profile("/etc/profile"); 152 state1: 153 state = 2; 154 if (privileged == 0) 155 read_profile("${HOME-}/.profile"); 156 else 157 read_profile("/etc/suid_profile"); 158 } 159 state2: 160 state = 3; 161 if (!privileged && iflag) { 162 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 163 state = 3; 164 read_profile(shinit); 165 } 166 } 167 state3: 168 state = 4; 169 popstackmark(&smark2); 170 if (minusc) { 171 evalstring(minusc, sflag ? 0 : EV_EXIT); 172 } 173 if (sflag || minusc == NULL) { 174 state4: /* XXX ??? - why isn't this before the "if" statement */ 175 cmdloop(1); 176 } 177 exitshell(exitstatus); 178 /*NOTREACHED*/ 179 return 0; 180 } 181 182 183 /* 184 * Read and execute commands. "Top" is nonzero for the top level command 185 * loop; it turns on prompting if the shell is interactive. 186 */ 187 188 static void 189 cmdloop(int top) 190 { 191 union node *n; 192 struct stackmark smark; 193 int inter; 194 int numeof = 0; 195 196 TRACE(("cmdloop(%d) called\n", top)); 197 setstackmark(&smark); 198 for (;;) { 199 if (pendingsig) 200 dotrap(); 201 inter = 0; 202 if (iflag && top) { 203 inter++; 204 showjobs(1, SHOWJOBS_DEFAULT); 205 chkmail(0); 206 flushout(&output); 207 } 208 n = parsecmd(inter); 209 /* showtree(n); DEBUG */ 210 if (n == NEOF) { 211 if (!top || numeof >= 50) 212 break; 213 if (!stoppedjobs()) { 214 if (!Iflag) 215 break; 216 out2fmt_flush("\nUse \"exit\" to leave shell.\n"); 217 } 218 numeof++; 219 } else if (n != NULL && nflag == 0) { 220 job_warning = (job_warning == 2) ? 1 : 0; 221 numeof = 0; 222 evaltree(n, 0); 223 } 224 popstackmark(&smark); 225 setstackmark(&smark); 226 if (evalskip != 0) { 227 if (evalskip == SKIPFILE) 228 evalskip = 0; 229 break; 230 } 231 } 232 popstackmark(&smark); 233 } 234 235 236 237 /* 238 * Read /etc/profile or .profile. Return on error. 239 */ 240 241 static void 242 read_profile(const char *name) 243 { 244 int fd; 245 const char *expandedname; 246 247 expandedname = expandstr(name); 248 if (expandedname == NULL) 249 return; 250 INTOFF; 251 if ((fd = open(expandedname, O_RDONLY | O_CLOEXEC)) >= 0) 252 setinputfd(fd, 1); 253 INTON; 254 if (fd < 0) 255 return; 256 cmdloop(0); 257 popfile(); 258 } 259 260 261 262 /* 263 * Read a file containing shell functions. 264 */ 265 266 void 267 readcmdfile(const char *name) 268 { 269 setinputfile(name, 1); 270 cmdloop(0); 271 popfile(); 272 } 273 274 275 276 /* 277 * Take commands from a file. To be compatible we should do a path 278 * search for the file, which is necessary to find sub-commands. 279 */ 280 281 282 static char * 283 find_dot_file(char *basename) 284 { 285 char *fullname; 286 const char *path = pathval(); 287 struct stat statb; 288 289 /* don't try this for absolute or relative paths */ 290 if( strchr(basename, '/')) 291 return basename; 292 293 while ((fullname = padvance(&path, basename)) != NULL) { 294 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { 295 /* 296 * Don't bother freeing here, since it will 297 * be freed by the caller. 298 */ 299 return fullname; 300 } 301 stunalloc(fullname); 302 } 303 return basename; 304 } 305 306 int 307 dotcmd(int argc, char **argv) 308 { 309 char *filename, *fullname; 310 311 if (argc < 2) 312 error("missing filename"); 313 314 exitstatus = 0; 315 316 /* 317 * Because we have historically not supported any options, 318 * only treat "--" specially. 319 */ 320 filename = argc > 2 && strcmp(argv[1], "--") == 0 ? argv[2] : argv[1]; 321 322 fullname = find_dot_file(filename); 323 setinputfile(fullname, 1); 324 commandname = fullname; 325 cmdloop(0); 326 popfile(); 327 return exitstatus; 328 } 329 330 331 int 332 exitcmd(int argc, char **argv) 333 { 334 if (stoppedjobs()) 335 return 0; 336 if (argc > 1) 337 exitshell(number(argv[1])); 338 else 339 exitshell_savedstatus(); 340 } 341