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 1.52 2011/06/13 21:03:27 jilles Exp $ 39 */ 40 41 #include <stdio.h> 42 #include <signal.h> 43 #include <sys/stat.h> 44 #include <unistd.h> 45 #include <fcntl.h> 46 #include <locale.h> 47 #include <errno.h> 48 49 #include "shell.h" 50 #include "main.h" 51 #include "mail.h" 52 #include "options.h" 53 #include "output.h" 54 #include "parser.h" 55 #include "nodes.h" 56 #include "expand.h" 57 #include "eval.h" 58 #include "jobs.h" 59 #include "input.h" 60 #include "trap.h" 61 #include "var.h" 62 #include "show.h" 63 #include "memalloc.h" 64 #include "error.h" 65 #include "init.h" 66 #include "mystring.h" 67 #include "exec.h" 68 #include "cd.h" 69 #include "builtins.h" 70 71 int rootpid; 72 int rootshell; 73 struct jmploc main_handler; 74 int localeisutf8, initial_localeisutf8; 75 76 static void read_profile(const char *); 77 static const char *find_dot_file(const char *); 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 stackmark smark, smark2; 91 volatile int state; 92 char *shinit; 93 94 setlocale(LC_ALL, ""); 95 initcharset(); 96 state = 0; 97 if (setjmp(main_handler.loc)) { 98 switch (exception) { 99 case EXEXEC: 100 exitstatus = exerrno; 101 break; 102 103 case EXERROR: 104 exitstatus = 2; 105 break; 106 107 default: 108 break; 109 } 110 111 if (state == 0 || iflag == 0 || ! rootshell || 112 exception == EXEXIT) 113 exitshell(exitstatus); 114 reset(); 115 if (exception == EXINT) 116 out2fmt_flush("\n"); 117 popstackmark(&smark); 118 FORCEINTON; /* enable interrupts */ 119 if (state == 1) 120 goto state1; 121 else if (state == 2) 122 goto state2; 123 else if (state == 3) 124 goto state3; 125 else 126 goto state4; 127 } 128 handler = &main_handler; 129 #ifdef DEBUG 130 opentrace(); 131 trputs("Shell args: "); trargs(argv); 132 #endif 133 rootpid = getpid(); 134 rootshell = 1; 135 init(); 136 setstackmark(&smark); 137 setstackmark(&smark2); 138 procargs(argc, argv); 139 pwd_init(iflag); 140 if (iflag) 141 chkmail(1); 142 if (argv[0] && argv[0][0] == '-') { 143 state = 1; 144 read_profile("/etc/profile"); 145 state1: 146 state = 2; 147 if (privileged == 0) 148 read_profile("${HOME-}/.profile"); 149 else 150 read_profile("/etc/suid_profile"); 151 } 152 state2: 153 state = 3; 154 if (!privileged && iflag) { 155 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 156 state = 3; 157 read_profile(shinit); 158 } 159 } 160 state3: 161 state = 4; 162 popstackmark(&smark2); 163 if (minusc) { 164 evalstring(minusc, sflag ? 0 : EV_EXIT); 165 } 166 if (sflag || minusc == NULL) { 167 state4: /* XXX ??? - why isn't this before the "if" statement */ 168 cmdloop(1); 169 } 170 exitshell(exitstatus); 171 /*NOTREACHED*/ 172 return 0; 173 } 174 175 176 /* 177 * Read and execute commands. "Top" is nonzero for the top level command 178 * loop; it turns on prompting if the shell is interactive. 179 */ 180 181 void 182 cmdloop(int top) 183 { 184 union node *n; 185 struct stackmark smark; 186 int inter; 187 int numeof = 0; 188 189 TRACE(("cmdloop(%d) called\n", top)); 190 setstackmark(&smark); 191 for (;;) { 192 if (pendingsigs) 193 dotrap(); 194 inter = 0; 195 if (iflag && top) { 196 inter++; 197 showjobs(1, SHOWJOBS_DEFAULT); 198 chkmail(0); 199 flushout(&output); 200 } 201 n = parsecmd(inter); 202 /* showtree(n); DEBUG */ 203 if (n == NEOF) { 204 if (!top || numeof >= 50) 205 break; 206 if (!stoppedjobs()) { 207 if (!Iflag) 208 break; 209 out2fmt_flush("\nUse \"exit\" to leave shell.\n"); 210 } 211 numeof++; 212 } else if (n != NULL && nflag == 0) { 213 job_warning = (job_warning == 2) ? 1 : 0; 214 numeof = 0; 215 evaltree(n, 0); 216 } 217 popstackmark(&smark); 218 setstackmark(&smark); 219 if (evalskip != 0) { 220 if (evalskip == SKIPFILE) 221 evalskip = 0; 222 break; 223 } 224 } 225 popstackmark(&smark); 226 } 227 228 229 230 /* 231 * Read /etc/profile or .profile. Return on error. 232 */ 233 234 static void 235 read_profile(const char *name) 236 { 237 int fd; 238 const char *expandedname; 239 240 expandedname = expandstr(__DECONST(char *, name)); 241 if (expandedname == NULL) 242 return; 243 INTOFF; 244 if ((fd = open(expandedname, O_RDONLY)) >= 0) 245 setinputfd(fd, 1); 246 INTON; 247 if (fd < 0) 248 return; 249 cmdloop(0); 250 popfile(); 251 } 252 253 254 255 /* 256 * Read a file containing shell functions. 257 */ 258 259 void 260 readcmdfile(const char *name) 261 { 262 int fd; 263 264 INTOFF; 265 if ((fd = open(name, O_RDONLY)) >= 0) 266 setinputfd(fd, 1); 267 else 268 error("cannot open %s: %s", name, strerror(errno)); 269 INTON; 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 const char * 283 find_dot_file(const 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 const char *fullname; 310 char *filename; 311 312 if (argc < 2) 313 error("missing filename"); 314 315 exitstatus = 0; 316 317 /* 318 * Because we have historically not supported any options, 319 * only treat "--" specially. 320 */ 321 filename = argc > 2 && strcmp(argv[1], "--") == 0 ? argv[2] : argv[1]; 322 323 fullname = find_dot_file(filename); 324 setinputfile(fullname, 1); 325 commandname = fullname; 326 cmdloop(0); 327 popfile(); 328 return exitstatus; 329 } 330 331 332 int 333 exitcmd(int argc, char **argv) 334 { 335 if (stoppedjobs()) 336 return 0; 337 if (argc > 1) 338 exitshell(number(argv[1])); 339 else 340 exitshell_savedstatus(); 341 } 342