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 * $Id: main.c,v 1.2 1994/09/24 02:57:48 davidg Exp $ 37 */ 38 39 #ifndef lint 40 static char copyright[] = 41 "@(#) Copyright (c) 1991, 1993\n\ 42 The Regents of the University of California. All rights reserved.\n"; 43 #endif /* not lint */ 44 45 #ifndef lint 46 static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 5/31/93"; 47 #endif /* not lint */ 48 49 #include <signal.h> 50 #include <fcntl.h> 51 #include "shell.h" 52 #include "main.h" 53 #include "mail.h" 54 #include "options.h" 55 #include "output.h" 56 #include "parser.h" 57 #include "nodes.h" 58 #include "eval.h" 59 #include "jobs.h" 60 #include "input.h" 61 #include "trap.h" 62 #include "var.h" 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 (exception == EXINT 122 #if ATTY 123 && (! attyset() || equal(termval(), "emacs")) 124 #endif 125 ) { 126 out2c('\n'); 127 flushout(&errout); 128 } 129 popstackmark(&smark); 130 FORCEINTON; /* enable interrupts */ 131 if (state == 1) 132 goto state1; 133 else if (state == 2) 134 goto state2; 135 else if (state == 3) 136 goto state3; 137 else 138 goto state4; 139 } 140 handler = &jmploc; 141 #ifdef DEBUG 142 opentrace(); 143 trputs("Shell args: "); trargs(argv); 144 #endif 145 rootpid = getpid(); 146 rootshell = 1; 147 init(); 148 setstackmark(&smark); 149 procargs(argc, argv); 150 if (argv[0] && argv[0][0] == '-') { 151 state = 1; 152 read_profile("/etc/profile"); 153 state1: 154 state = 2; 155 read_profile(".profile"); 156 } 157 state2: 158 state = 3; 159 if ((shinit = lookupvar("ENV")) != NULL && 160 *shinit != '\0') { 161 state = 3; 162 read_profile(shinit); 163 } 164 state3: 165 state = 4; 166 if (minusc) { 167 evalstring(minusc); 168 } 169 if (sflag || minusc == NULL) { 170 state4: /* XXX ??? - why isn't this before the "if" statement */ 171 cmdloop(1); 172 } 173 #if PROFILE 174 monitor(0); 175 #endif 176 exitshell(exitstatus); 177 } 178 179 180 /* 181 * Read and execute commands. "Top" is nonzero for the top level command 182 * loop; it turns on prompting if the shell is interactive. 183 */ 184 185 void 186 cmdloop(top) { 187 union node *n; 188 struct stackmark smark; 189 int inter; 190 int numeof = 0; 191 192 TRACE(("cmdloop(%d) called\n", top)); 193 setstackmark(&smark); 194 for (;;) { 195 if (pendingsigs) 196 dotrap(); 197 inter = 0; 198 if (iflag && top) { 199 inter++; 200 showjobs(1); 201 chkmail(0); 202 flushout(&output); 203 } 204 n = parsecmd(inter); 205 /* showtree(n); DEBUG */ 206 if (n == NEOF) { 207 if (!top || numeof >= 50) 208 break; 209 if (!stoppedjobs()) { 210 if (!Iflag) 211 break; 212 out2str("\nUse \"exit\" to leave shell.\n"); 213 } 214 numeof++; 215 } else if (n != NULL && nflag == 0) { 216 job_warning = (job_warning == 2) ? 1 : 0; 217 numeof = 0; 218 evaltree(n, 0); 219 } 220 popstackmark(&smark); 221 } 222 popstackmark(&smark); /* unnecessary */ 223 } 224 225 226 227 /* 228 * Read /etc/profile or .profile. Return on error. 229 */ 230 231 STATIC void 232 read_profile(name) 233 char *name; 234 { 235 int fd; 236 237 INTOFF; 238 if ((fd = open(name, O_RDONLY)) >= 0) 239 setinputfd(fd, 1); 240 INTON; 241 if (fd < 0) 242 return; 243 cmdloop(0); 244 popfile(); 245 } 246 247 248 249 /* 250 * Read a file containing shell functions. 251 */ 252 253 void 254 readcmdfile(name) 255 char *name; 256 { 257 int fd; 258 259 INTOFF; 260 if ((fd = open(name, O_RDONLY)) >= 0) 261 setinputfd(fd, 1); 262 else 263 error("Can't open %s", name); 264 INTON; 265 cmdloop(0); 266 popfile(); 267 } 268 269 270 271 /* 272 * Take commands from a file. To be compatable we should do a path 273 * search for the file, but a path search doesn't make any sense. 274 */ 275 276 dotcmd(argc, argv) char **argv; { 277 exitstatus = 0; 278 if (argc >= 2) { /* That's what SVR2 does */ 279 setinputfile(argv[1], 1); 280 commandname = argv[1]; 281 cmdloop(0); 282 popfile(); 283 } 284 return exitstatus; 285 } 286 287 288 exitcmd(argc, argv) char **argv; { 289 if (stoppedjobs()) 290 return; 291 if (argc > 1) 292 exitstatus = number(argv[1]); 293 exitshell(exitstatus); 294 } 295 296 297 #ifdef notdef 298 /* 299 * Should never be called. 300 */ 301 302 void 303 exit(exitstatus) { 304 _exit(exitstatus); 305 } 306 #endif 307