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 79 STATIC void read_profile(char *); 80 STATIC char *find_dot_file(char *); 81 82 /* 83 * Main routine. We initialize things, parse the arguments, execute 84 * profiles if we're a login shell, and then call cmdloop to execute 85 * commands. The setjmp call sets up the location to jump to when an 86 * exception occurs. When an exception occurs the variable "state" 87 * is used to figure out how far we had gotten. 88 */ 89 90 int 91 main(int argc, char *argv[]) 92 { 93 struct jmploc jmploc; 94 struct stackmark smark; 95 volatile int state; 96 char *shinit; 97 98 (void) setlocale(LC_ALL, ""); 99 state = 0; 100 if (setjmp(jmploc.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 = &jmploc; 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 out2str("sh: cannot determine working directory\n"); 158 if (argv[0] && argv[0][0] == '-') { 159 state = 1; 160 read_profile("/etc/profile"); 161 state1: 162 state = 2; 163 if (privileged == 0) 164 read_profile(".profile"); 165 else 166 read_profile("/etc/suid_profile"); 167 } 168 state2: 169 state = 3; 170 if (!privileged && iflag) { 171 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 172 state = 3; 173 read_profile(shinit); 174 } 175 } 176 state3: 177 state = 4; 178 if (minusc) { 179 evalstring(minusc); 180 } 181 if (sflag || minusc == NULL) { 182 state4: /* XXX ??? - why isn't this before the "if" statement */ 183 cmdloop(1); 184 } 185 exitshell(exitstatus); 186 /*NOTREACHED*/ 187 return 0; 188 } 189 190 191 /* 192 * Read and execute commands. "Top" is nonzero for the top level command 193 * loop; it turns on prompting if the shell is interactive. 194 */ 195 196 void 197 cmdloop(int top) 198 { 199 union node *n; 200 struct stackmark smark; 201 int inter; 202 int numeof = 0; 203 204 TRACE(("cmdloop(%d) called\n", top)); 205 setstackmark(&smark); 206 for (;;) { 207 if (pendingsigs) 208 dotrap(); 209 inter = 0; 210 if (iflag && top) { 211 inter++; 212 showjobs(1, 0, 0); 213 chkmail(0); 214 flushout(&output); 215 } 216 n = parsecmd(inter); 217 /* showtree(n); DEBUG */ 218 if (n == NEOF) { 219 if (!top || numeof >= 50) 220 break; 221 if (!stoppedjobs()) { 222 if (!Iflag) 223 break; 224 out2str("\nUse \"exit\" to leave shell.\n"); 225 } 226 numeof++; 227 } else if (n != NULL && nflag == 0) { 228 job_warning = (job_warning == 2) ? 1 : 0; 229 numeof = 0; 230 evaltree(n, 0); 231 } 232 popstackmark(&smark); 233 setstackmark(&smark); 234 if (evalskip == SKIPFILE) { 235 evalskip = 0; 236 break; 237 } 238 } 239 popstackmark(&smark); 240 } 241 242 243 244 /* 245 * Read /etc/profile or .profile. Return on error. 246 */ 247 248 STATIC void 249 read_profile(char *name) 250 { 251 int fd; 252 253 INTOFF; 254 if ((fd = open(name, O_RDONLY)) >= 0) 255 setinputfd(fd, 1); 256 INTON; 257 if (fd < 0) 258 return; 259 cmdloop(0); 260 popfile(); 261 } 262 263 264 265 /* 266 * Read a file containing shell functions. 267 */ 268 269 void 270 readcmdfile(char *name) 271 { 272 int fd; 273 274 INTOFF; 275 if ((fd = open(name, O_RDONLY)) >= 0) 276 setinputfd(fd, 1); 277 else 278 error("Can't open %s: %s", name, strerror(errno)); 279 INTON; 280 cmdloop(0); 281 popfile(); 282 } 283 284 285 286 /* 287 * Take commands from a file. To be compatible we should do a path 288 * search for the file, which is necessary to find sub-commands. 289 */ 290 291 292 STATIC char * 293 find_dot_file(char *basename) 294 { 295 static char localname[FILENAME_MAX+1]; 296 char *fullname; 297 char *path = pathval(); 298 struct stat statb; 299 300 /* don't try this for absolute or relative paths */ 301 if( strchr(basename, '/')) 302 return basename; 303 304 while ((fullname = padvance(&path, basename)) != NULL) { 305 strcpy(localname, fullname); 306 stunalloc(fullname); 307 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 308 return localname; 309 } 310 return basename; 311 } 312 313 int 314 dotcmd(int argc, char **argv) 315 { 316 struct strlist *sp; 317 exitstatus = 0; 318 319 for (sp = cmdenviron; sp ; sp = sp->next) 320 setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); 321 322 if (argc >= 2) { /* That's what SVR2 does */ 323 char *fullname = find_dot_file(argv[1]); 324 325 setinputfile(fullname, 1); 326 commandname = fullname; 327 cmdloop(0); 328 popfile(); 329 } 330 return exitstatus; 331 } 332 333 334 int 335 exitcmd(int argc, char **argv) 336 { 337 extern int oexitstatus; 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