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 switch (exception) { 102 case EXEXEC: 103 exitstatus = exerrno; 104 break; 105 106 case EXERROR: 107 exitstatus = 2; 108 break; 109 110 default: 111 break; 112 } 113 114 if (state == 0 || iflag == 0 || ! rootshell) 115 exitshell(exitstatus); 116 reset(); 117 if (exception == EXINT) 118 out2fmt_flush("\n"); 119 popstackmark(&smark); 120 FORCEINTON; /* enable interrupts */ 121 if (state == 1) 122 goto state1; 123 else if (state == 2) 124 goto state2; 125 else if (state == 3) 126 goto state3; 127 else 128 goto state4; 129 } 130 handler = &main_handler; 131 #ifdef DEBUG 132 opentrace(); 133 trputs("Shell args: "); trargs(argv); 134 #endif 135 rootpid = getpid(); 136 rootshell = 1; 137 init(); 138 setstackmark(&smark); 139 procargs(argc, argv); 140 pwd_init(iflag); 141 if (iflag) 142 chkmail(1); 143 if (argv[0] && argv[0][0] == '-') { 144 state = 1; 145 read_profile("/etc/profile"); 146 state1: 147 state = 2; 148 if (privileged == 0) 149 read_profile(".profile"); 150 else 151 read_profile("/etc/suid_profile"); 152 } 153 state2: 154 state = 3; 155 if (!privileged && iflag) { 156 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 157 state = 3; 158 read_profile(shinit); 159 } 160 } 161 state3: 162 state = 4; 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; 238 239 INTOFF; 240 if ((fd = open(name, O_RDONLY)) >= 0) 241 setinputfd(fd, 1); 242 INTON; 243 if (fd < 0) 244 return; 245 cmdloop(0); 246 popfile(); 247 } 248 249 250 251 /* 252 * Read a file containing shell functions. 253 */ 254 255 void 256 readcmdfile(const char *name) 257 { 258 int fd; 259 260 INTOFF; 261 if ((fd = open(name, O_RDONLY)) >= 0) 262 setinputfd(fd, 1); 263 else 264 error("Can't open %s: %s", name, strerror(errno)); 265 INTON; 266 cmdloop(0); 267 popfile(); 268 } 269 270 271 272 /* 273 * Take commands from a file. To be compatible we should do a path 274 * search for the file, which is necessary to find sub-commands. 275 */ 276 277 278 static char * 279 find_dot_file(char *basename) 280 { 281 static char localname[FILENAME_MAX+1]; 282 char *fullname; 283 const char *path = pathval(); 284 struct stat statb; 285 286 /* don't try this for absolute or relative paths */ 287 if( strchr(basename, '/')) 288 return basename; 289 290 while ((fullname = padvance(&path, basename)) != NULL) { 291 strcpy(localname, fullname); 292 stunalloc(fullname); 293 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 294 return localname; 295 } 296 return basename; 297 } 298 299 int 300 dotcmd(int argc, char **argv) 301 { 302 char *filename, *fullname; 303 304 if (argc < 2) 305 error("missing filename"); 306 307 exitstatus = 0; 308 309 /* 310 * Because we have historically not supported any options, 311 * only treat "--" specially. 312 */ 313 filename = argc > 2 && strcmp(argv[1], "--") == 0 ? argv[2] : argv[1]; 314 315 fullname = find_dot_file(filename); 316 setinputfile(fullname, 1); 317 commandname = fullname; 318 cmdloop(0); 319 popfile(); 320 return exitstatus; 321 } 322 323 324 int 325 exitcmd(int argc, char **argv) 326 { 327 if (stoppedjobs()) 328 return 0; 329 if (argc > 1) 330 exitshell(number(argv[1])); 331 else 332 exitshell_savedstatus(); 333 } 334