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 37 #ifndef lint 38 static char copyright[] = 39 "@(#) Copyright (c) 1991, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 /*static char sccsid[] = "from: @(#)main.c 8.1 (Berkeley) 5/31/93";*/ 45 static char *rcsid = "$Id: main.c,v 1.16 1994/12/05 19:07:43 cgd Exp $"; 46 #endif /* not lint */ 47 48 #include <stdio.h> 49 #include <signal.h> 50 #include <sys/stat.h> 51 #include <unistd.h> 52 #include <fcntl.h> 53 #include "shell.h" 54 #include "main.h" 55 #include "mail.h" 56 #include "options.h" 57 #include "output.h" 58 #include "parser.h" 59 #include "nodes.h" 60 #include "eval.h" 61 #include "jobs.h" 62 #include "input.h" 63 #include "trap.h" 64 #include "var.h" 65 #include "memalloc.h" 66 #include "error.h" 67 #include "init.h" 68 #include "mystring.h" 69 #include "exec.h" 70 #include "extern.h" 71 72 #define PROFILE 0 73 74 int rootpid; 75 int rootshell; 76 STATIC union node *curcmd; 77 STATIC union node *prevcmd; 78 extern int errno; 79 #if PROFILE 80 short profile_buf[16384]; 81 extern int etext(); 82 #endif 83 84 #ifdef __STDC__ 85 STATIC void read_profile(char *); 86 char *getenv(char *); 87 #else 88 STATIC void read_profile(); 89 char *getenv(); 90 #endif 91 92 93 /* 94 * Main routine. We initialize things, parse the arguments, execute 95 * profiles if we're a login shell, and then call cmdloop to execute 96 * commands. The setjmp call sets up the location to jump to when an 97 * exception occurs. When an exception occurs the variable "state" 98 * is used to figure out how far we had gotten. 99 */ 100 101 int 102 main(argc, argv) 103 int argc; 104 char **argv; 105 { 106 struct jmploc jmploc; 107 struct stackmark smark; 108 volatile int state; 109 char *shinit; 110 111 #if PROFILE 112 monitor(4, etext, profile_buf, sizeof profile_buf, 50); 113 #endif 114 state = 0; 115 if (setjmp(jmploc.loc)) { 116 /* 117 * When a shell procedure is executed, we raise the 118 * exception EXSHELLPROC to clean up before executing 119 * the shell procedure. 120 */ 121 if (exception == EXSHELLPROC) { 122 rootpid = getpid(); 123 rootshell = 1; 124 minusc = NULL; 125 state = 3; 126 } else if (state == 0 || iflag == 0 || ! rootshell) 127 exitshell(2); 128 reset(); 129 if (exception == EXINT 130 #if ATTY 131 && (! attyset() || equal(termval(), "emacs")) 132 #endif 133 ) { 134 out2c('\n'); 135 flushout(&errout); 136 } 137 popstackmark(&smark); 138 FORCEINTON; /* enable interrupts */ 139 if (state == 1) 140 goto state1; 141 else if (state == 2) 142 goto state2; 143 else if (state == 3) 144 goto state3; 145 else 146 goto state4; 147 } 148 handler = &jmploc; 149 #ifdef DEBUG 150 opentrace(); 151 trputs("Shell args: "); trargs(argv); 152 #endif 153 rootpid = getpid(); 154 rootshell = 1; 155 init(); 156 setstackmark(&smark); 157 procargs(argc, argv); 158 if (argv[0] && argv[0][0] == '-') { 159 state = 1; 160 read_profile("/etc/profile"); 161 state1: 162 state = 2; 163 read_profile(".profile"); 164 } 165 state2: 166 state = 3; 167 if (getuid() == geteuid() && getgid() == getegid()) { 168 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 169 state = 3; 170 read_profile(shinit); 171 } 172 } 173 state3: 174 state = 4; 175 if (minusc) { 176 evalstring(minusc); 177 } 178 if (sflag || minusc == NULL) { 179 state4: /* XXX ??? - why isn't this before the "if" statement */ 180 cmdloop(1); 181 } 182 #if PROFILE 183 monitor(0); 184 #endif 185 exitshell(exitstatus); 186 } 187 188 189 /* 190 * Read and execute commands. "Top" is nonzero for the top level command 191 * loop; it turns on prompting if the shell is interactive. 192 */ 193 194 void 195 cmdloop(top) 196 int top; 197 { 198 union node *n; 199 struct stackmark smark; 200 int inter; 201 int numeof = 0; 202 203 TRACE(("cmdloop(%d) called\n", top)); 204 setstackmark(&smark); 205 for (;;) { 206 if (pendingsigs) 207 dotrap(); 208 inter = 0; 209 if (iflag && top) { 210 inter++; 211 showjobs(1); 212 chkmail(0); 213 flushout(&output); 214 } 215 n = parsecmd(inter); 216 /* showtree(n); DEBUG */ 217 if (n == NEOF) { 218 if (!top || numeof >= 50) 219 break; 220 if (!stoppedjobs()) { 221 if (!Iflag) 222 break; 223 out2str("\nUse \"exit\" to leave shell.\n"); 224 } 225 numeof++; 226 } else if (n != NULL && nflag == 0) { 227 job_warning = (job_warning == 2) ? 1 : 0; 228 numeof = 0; 229 evaltree(n, 0); 230 } 231 popstackmark(&smark); 232 } 233 popstackmark(&smark); /* unnecessary */ 234 } 235 236 237 238 /* 239 * Read /etc/profile or .profile. Return on error. 240 */ 241 242 STATIC void 243 read_profile(name) 244 char *name; 245 { 246 int fd; 247 248 INTOFF; 249 if ((fd = open(name, O_RDONLY)) >= 0) 250 setinputfd(fd, 1); 251 INTON; 252 if (fd < 0) 253 return; 254 cmdloop(0); 255 popfile(); 256 } 257 258 259 260 /* 261 * Read a file containing shell functions. 262 */ 263 264 void 265 readcmdfile(name) 266 char *name; 267 { 268 int fd; 269 270 INTOFF; 271 if ((fd = open(name, O_RDONLY)) >= 0) 272 setinputfd(fd, 1); 273 else 274 error("Can't open %s", name); 275 INTON; 276 cmdloop(0); 277 popfile(); 278 } 279 280 281 282 /* 283 * Take commands from a file. To be compatable we should do a path 284 * search for the file, which is necessary to find sub-commands. 285 */ 286 287 288 static char * 289 find_dot_file(basename) char *basename; { 290 static char localname[FILENAME_MAX+1]; 291 char *fullname; 292 char *path = pathval(); 293 struct stat statb; 294 295 /* don't try this for absolute or relative paths */ 296 if( strchr(basename, '/')) 297 return basename; 298 299 while ((fullname = padvance(&path, basename)) != NULL) { 300 strcpy(localname, fullname); 301 stunalloc(fullname); 302 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 303 return localname; 304 } 305 return basename; 306 } 307 308 int 309 dotcmd(argc, argv) 310 int argc; 311 char **argv; 312 { 313 exitstatus = 0; 314 if (argc >= 2) { /* That's what SVR2 does */ 315 char *fullname = find_dot_file(argv[1]); 316 setinputfile(fullname, 1); 317 commandname = fullname; 318 cmdloop(0); 319 popfile(); 320 } 321 return exitstatus; 322 } 323 324 325 int 326 exitcmd(argc, argv) 327 int argc; 328 char **argv; 329 { 330 if (stoppedjobs()) 331 return; 332 if (argc > 1) 333 exitstatus = number(argv[1]); 334 exitshell(exitstatus); 335 } 336 337 338 #ifdef notdef 339 /* 340 * Should never be called. 341 */ 342 343 void 344 exit(exitstatus) { 345 _exit(exitstatus); 346 } 347 #endif 348