main.c revision 1.1
1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * 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 char copyright[] = 39 "@(#) Copyright (c) 1991 The Regents of the University of California.\n\ 40 All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 static char sccsid[] = "@(#)main.c 5.2 (Berkeley) 3/13/91"; 45 #endif /* not lint */ 46 47 #include <signal.h> 48 #include <fcntl.h> 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 "eval.h" 57 #include "jobs.h" 58 #include "input.h" 59 #include "trap.h" 60 #if ATTY 61 #include "var.h" 62 #endif 63 #include "memalloc.h" 64 #include "error.h" 65 #include "init.h" 66 #include "mystring.h" 67 68 #define PROFILE 0 69 70 int rootpid; 71 int rootshell; 72 STATIC union node *curcmd; 73 STATIC union node *prevcmd; 74 extern int errno; 75 #if PROFILE 76 short profile_buf[16384]; 77 extern int etext(); 78 #endif 79 80 #ifdef __STDC__ 81 STATIC void read_profile(char *); 82 char *getenv(char *); 83 #else 84 STATIC void read_profile(); 85 char *getenv(); 86 #endif 87 88 89 /* 90 * Main routine. We initialize things, parse the arguments, execute 91 * profiles if we're a login shell, and then call cmdloop to execute 92 * commands. The setjmp call sets up the location to jump to when an 93 * exception occurs. When an exception occurs the variable "state" 94 * is used to figure out how far we had gotten. 95 */ 96 97 main(argc, argv) char **argv; { 98 struct jmploc jmploc; 99 struct stackmark smark; 100 volatile int state; 101 char *shinit; 102 103 #if PROFILE 104 monitor(4, etext, profile_buf, sizeof profile_buf, 50); 105 #endif 106 state = 0; 107 if (setjmp(jmploc.loc)) { 108 /* 109 * When a shell procedure is executed, we raise the 110 * exception EXSHELLPROC to clean up before executing 111 * the shell procedure. 112 */ 113 if (exception == EXSHELLPROC) { 114 rootpid = getpid(); 115 rootshell = 1; 116 minusc = NULL; 117 state = 3; 118 } else if (state == 0 || iflag == 0 || ! rootshell) 119 exitshell(2); 120 reset(); 121 #if ATTY 122 if (exception == EXINT 123 && (! attyset() || equal(termval(), "emacs"))) { 124 #else 125 if (exception == EXINT) { 126 #endif 127 out2c('\n'); 128 flushout(&errout); 129 } 130 popstackmark(&smark); 131 FORCEINTON; /* enable interrupts */ 132 if (state == 1) 133 goto state1; 134 else if (state == 2) 135 goto state2; 136 else 137 goto state3; 138 } 139 handler = &jmploc; 140 #ifdef DEBUG 141 opentrace(); 142 trputs("Shell args: "); trargs(argv); 143 #endif 144 rootpid = getpid(); 145 rootshell = 1; 146 init(); 147 setstackmark(&smark); 148 procargs(argc, argv); 149 if (argv[0] && argv[0][0] == '-') { 150 state = 1; 151 read_profile("/etc/profile"); 152 state1: 153 state = 2; 154 read_profile(".profile"); 155 } else if ((sflag || minusc) && (shinit = getenv("SHINIT")) != NULL) { 156 state = 2; 157 evalstring(shinit); 158 } 159 state2: 160 state = 3; 161 if (minusc) { 162 evalstring(minusc); 163 } 164 if (sflag || minusc == NULL) { 165 state3: 166 cmdloop(1); 167 } 168 #if PROFILE 169 monitor(0); 170 #endif 171 exitshell(exitstatus); 172 } 173 174 175 /* 176 * Read and execute commands. "Top" is nonzero for the top level command 177 * loop; it turns on prompting if the shell is interactive. 178 */ 179 180 void 181 cmdloop(top) { 182 union node *n; 183 struct stackmark smark; 184 int inter; 185 int numeof; 186 187 TRACE(("cmdloop(%d) called\n", top)); 188 setstackmark(&smark); 189 numeof = 0; 190 for (;;) { 191 if (pendingsigs) 192 dotrap(); 193 inter = 0; 194 if (iflag && top) { 195 inter++; 196 showjobs(1); 197 chkmail(0); 198 flushout(&output); 199 } 200 n = parsecmd(inter); 201 #ifdef DEBUG 202 /* showtree(n); */ 203 #endif 204 if (n == NEOF) { 205 if (Iflag == 0 || numeof >= 50) 206 break; 207 out2str("\nUse \"exit\" to leave shell.\n"); 208 numeof++; 209 } else if (n != NULL && nflag == 0) { 210 if (inter) { 211 INTOFF; 212 if (prevcmd) 213 freefunc(prevcmd); 214 prevcmd = curcmd; 215 curcmd = copyfunc(n); 216 INTON; 217 } 218 evaltree(n, 0); 219 #ifdef notdef 220 if (exitstatus) /*DEBUG*/ 221 outfmt(&errout, "Exit status 0x%X\n", exitstatus); 222 #endif 223 } 224 popstackmark(&smark); 225 } 226 popstackmark(&smark); /* unnecessary */ 227 } 228 229 230 231 /* 232 * Read /etc/profile or .profile. Return on error. 233 */ 234 235 STATIC void 236 read_profile(name) 237 char *name; 238 { 239 int fd; 240 241 INTOFF; 242 if ((fd = open(name, O_RDONLY)) >= 0) 243 setinputfd(fd, 1); 244 INTON; 245 if (fd < 0) 246 return; 247 cmdloop(0); 248 popfile(); 249 } 250 251 252 253 /* 254 * Read a file containing shell functions. 255 */ 256 257 void 258 readcmdfile(name) 259 char *name; 260 { 261 int fd; 262 263 INTOFF; 264 if ((fd = open(name, O_RDONLY)) >= 0) 265 setinputfd(fd, 1); 266 else 267 error("Can't open %s", name); 268 INTON; 269 cmdloop(0); 270 popfile(); 271 } 272 273 274 275 /* 276 * Take commands from a file. To be compatable we should do a path 277 * search for the file, but a path search doesn't make any sense. 278 */ 279 280 dotcmd(argc, argv) char **argv; { 281 exitstatus = 0; 282 if (argc >= 2) { /* That's what SVR2 does */ 283 setinputfile(argv[1], 1); 284 commandname = argv[1]; 285 cmdloop(0); 286 popfile(); 287 } 288 return exitstatus; 289 } 290 291 292 exitcmd(argc, argv) char **argv; { 293 if (argc > 1) 294 exitstatus = number(argv[1]); 295 exitshell(exitstatus); 296 } 297 298 299 lccmd(argc, argv) char **argv; { 300 if (argc > 1) { 301 defun(argv[1], prevcmd); 302 return 0; 303 } else { 304 INTOFF; 305 freefunc(curcmd); 306 curcmd = prevcmd; 307 prevcmd = NULL; 308 INTON; 309 evaltree(curcmd, 0); 310 return exitstatus; 311 } 312 } 313 314 315 316 #ifdef notdef 317 /* 318 * Should never be called. 319 */ 320 321 void 322 exit(exitstatus) { 323 _exit(exitstatus); 324 } 325 #endif 326
Indexes created Tue Sep 23 07:09:52 GMT 2025