main.c revision 248980
1240116Smarcel/*- 2240116Smarcel * Copyright (c) 1991, 1993 3240116Smarcel * The Regents of the University of California. All rights reserved. 4240116Smarcel * 5240116Smarcel * This code is derived from software contributed to Berkeley by 6240116Smarcel * Kenneth Almquist. 7240116Smarcel * 8240116Smarcel * Redistribution and use in source and binary forms, with or without 9240116Smarcel * modification, are permitted provided that the following conditions 10240116Smarcel * are met: 11240116Smarcel * 1. Redistributions of source code must retain the above copyright 12240116Smarcel * notice, this list of conditions and the following disclaimer. 13240116Smarcel * 2. Redistributions in binary form must reproduce the above copyright 14240116Smarcel * notice, this list of conditions and the following disclaimer in the 15240116Smarcel * documentation and/or other materials provided with the distribution. 16240116Smarcel * 4. Neither the name of the University nor the names of its contributors 17240116Smarcel * may be used to endorse or promote products derived from this software 18240116Smarcel * without specific prior written permission. 19240116Smarcel * 20240116Smarcel * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21240116Smarcel * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22240116Smarcel * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23240116Smarcel * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24240116Smarcel * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25240116Smarcel * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26240116Smarcel * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27240116Smarcel * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28240116Smarcel * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29240116Smarcel * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30240116Smarcel * SUCH DAMAGE. 31240116Smarcel */ 32240116Smarcel 33240116Smarcel#ifndef lint 34240116Smarcelstatic char const copyright[] = 35240116Smarcel"@(#) Copyright (c) 1991, 1993\n\ 36240116Smarcel The Regents of the University of California. All rights reserved.\n"; 37240116Smarcel#endif /* not lint */ 38240116Smarcel 39240116Smarcel#ifndef lint 40240116Smarcel#if 0 41240116Smarcelstatic char sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/28/95"; 42240116Smarcel#endif 43240116Smarcel#endif /* not lint */ 44240116Smarcel#include <sys/cdefs.h> 45240116Smarcel__FBSDID("$FreeBSD: head/bin/sh/main.c 248980 2013-04-01 17:18:22Z jilles $"); 46240116Smarcel 47240116Smarcel#include <stdio.h> 48240116Smarcel#include <signal.h> 49240116Smarcel#include <sys/stat.h> 50240116Smarcel#include <unistd.h> 51240116Smarcel#include <fcntl.h> 52240116Smarcel#include <locale.h> 53240116Smarcel#include <errno.h> 54240116Smarcel 55240116Smarcel#include "shell.h" 56240116Smarcel#include "main.h" 57240116Smarcel#include "mail.h" 58240116Smarcel#include "options.h" 59240116Smarcel#include "output.h" 60240116Smarcel#include "parser.h" 61240116Smarcel#include "nodes.h" 62240116Smarcel#include "expand.h" 63240116Smarcel#include "eval.h" 64240116Smarcel#include "jobs.h" 65240116Smarcel#include "input.h" 66240116Smarcel#include "trap.h" 67240116Smarcel#include "var.h" 68240116Smarcel#include "show.h" 69240116Smarcel#include "memalloc.h" 70240116Smarcel#include "error.h" 71240116Smarcel#include "init.h" 72240116Smarcel#include "mystring.h" 73240116Smarcel#include "exec.h" 74240116Smarcel#include "cd.h" 75240116Smarcel#include "builtins.h" 76240116Smarcel 77240116Smarcelint rootpid; 78240116Smarcelint rootshell; 79240116Smarcelstruct jmploc main_handler; 80240116Smarcelint localeisutf8, initial_localeisutf8; 81240116Smarcel 82240116Smarcelstatic void cmdloop(int); 83240116Smarcelstatic void read_profile(const char *); 84240116Smarcelstatic char *find_dot_file(char *); 85240116Smarcel 86240116Smarcel/* 87240116Smarcel * Main routine. We initialize things, parse the arguments, execute 88240116Smarcel * profiles if we're a login shell, and then call cmdloop to execute 89240116Smarcel * commands. The setjmp call sets up the location to jump to when an 90240116Smarcel * exception occurs. When an exception occurs the variable "state" 91240116Smarcel * is used to figure out how far we had gotten. 92240116Smarcel */ 93240116Smarcel 94240116Smarcelint 95240116Smarcelmain(int argc, char *argv[]) 96240116Smarcel{ 97240116Smarcel struct stackmark smark, smark2; 98240116Smarcel volatile int state; 99240116Smarcel char *shinit; 100240116Smarcel 101240116Smarcel (void) setlocale(LC_ALL, ""); 102240116Smarcel initcharset(); 103240116Smarcel state = 0; 104240116Smarcel if (setjmp(main_handler.loc)) { 105240116Smarcel switch (exception) { 106240116Smarcel case EXEXEC: 107240116Smarcel exitstatus = exerrno; 108240116Smarcel break; 109240116Smarcel 110240116Smarcel case EXERROR: 111240116Smarcel exitstatus = 2; 112240116Smarcel break; 113240116Smarcel 114240116Smarcel default: 115240116Smarcel break; 116240116Smarcel } 117240116Smarcel 118240116Smarcel if (state == 0 || iflag == 0 || ! rootshell || 119240116Smarcel exception == EXEXIT) 120240116Smarcel exitshell(exitstatus); 121240116Smarcel reset(); 122240116Smarcel if (exception == EXINT) 123240116Smarcel out2fmt_flush("\n"); 124240116Smarcel popstackmark(&smark); 125240116Smarcel FORCEINTON; /* enable interrupts */ 126240116Smarcel if (state == 1) 127240116Smarcel goto state1; 128240116Smarcel else if (state == 2) 129240116Smarcel goto state2; 130240116Smarcel else if (state == 3) 131240116Smarcel goto state3; 132240116Smarcel else 133240116Smarcel goto state4; 134240116Smarcel } 135240116Smarcel handler = &main_handler; 136240116Smarcel#ifdef DEBUG 137240116Smarcel opentrace(); 138240116Smarcel trputs("Shell args: "); trargs(argv); 139240116Smarcel#endif 140240116Smarcel rootpid = getpid(); 141240116Smarcel rootshell = 1; 142240116Smarcel initvar(); 143240116Smarcel setstackmark(&smark); 144240116Smarcel setstackmark(&smark2); 145240116Smarcel procargs(argc, argv); 146240116Smarcel pwd_init(iflag); 147240116Smarcel if (iflag) 148240116Smarcel chkmail(1); 149240116Smarcel if (argv[0] && argv[0][0] == '-') { 150240116Smarcel state = 1; 151240116Smarcel read_profile("/etc/profile"); 152240116Smarcelstate1: 153240116Smarcel state = 2; 154240116Smarcel if (privileged == 0) 155240116Smarcel read_profile("${HOME-}/.profile"); 156240116Smarcel else 157240116Smarcel read_profile("/etc/suid_profile"); 158240116Smarcel } 159240116Smarcelstate2: 160240116Smarcel state = 3; 161240116Smarcel if (!privileged && iflag) { 162240116Smarcel if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 163240116Smarcel state = 3; 164240116Smarcel read_profile(shinit); 165240116Smarcel } 166240116Smarcel } 167240116Smarcelstate3: 168240116Smarcel state = 4; 169240116Smarcel popstackmark(&smark2); 170240116Smarcel if (minusc) { 171240116Smarcel evalstring(minusc, sflag ? 0 : EV_EXIT); 172240116Smarcel } 173240116Smarcel if (sflag || minusc == NULL) { 174240116Smarcelstate4: /* XXX ??? - why isn't this before the "if" statement */ 175240116Smarcel cmdloop(1); 176240116Smarcel } 177240116Smarcel exitshell(exitstatus); 178240116Smarcel /*NOTREACHED*/ 179240116Smarcel return 0; 180240116Smarcel} 181240116Smarcel 182240116Smarcel 183240116Smarcel/* 184240116Smarcel * Read and execute commands. "Top" is nonzero for the top level command 185240116Smarcel * loop; it turns on prompting if the shell is interactive. 186240116Smarcel */ 187240116Smarcel 188240116Smarcelstatic void 189240116Smarcelcmdloop(int top) 190240116Smarcel{ 191240116Smarcel union node *n; 192240116Smarcel struct stackmark smark; 193240116Smarcel int inter; 194240116Smarcel int numeof = 0; 195240116Smarcel 196240116Smarcel TRACE(("cmdloop(%d) called\n", top)); 197240116Smarcel setstackmark(&smark); 198240116Smarcel for (;;) { 199240116Smarcel if (pendingsig) 200240116Smarcel dotrap(); 201240116Smarcel inter = 0; 202240116Smarcel if (iflag && top) { 203240116Smarcel inter++; 204240116Smarcel showjobs(1, SHOWJOBS_DEFAULT); 205240116Smarcel chkmail(0); 206240116Smarcel flushout(&output); 207240116Smarcel } 208240116Smarcel n = parsecmd(inter); 209240116Smarcel /* showtree(n); DEBUG */ 210240116Smarcel if (n == NEOF) { 211240116Smarcel if (!top || numeof >= 50) 212240116Smarcel break; 213240116Smarcel if (!stoppedjobs()) { 214240116Smarcel if (!Iflag) 215240116Smarcel break; 216240116Smarcel out2fmt_flush("\nUse \"exit\" to leave shell.\n"); 217240116Smarcel } 218240116Smarcel numeof++; 219240116Smarcel } else if (n != NULL && nflag == 0) { 220240116Smarcel job_warning = (job_warning == 2) ? 1 : 0; 221240116Smarcel numeof = 0; 222240116Smarcel evaltree(n, 0); 223240116Smarcel } 224240116Smarcel popstackmark(&smark); 225240116Smarcel setstackmark(&smark); 226240116Smarcel if (evalskip != 0) { 227240116Smarcel if (evalskip == SKIPFILE) 228240116Smarcel evalskip = 0; 229240116Smarcel break; 230240116Smarcel } 231240116Smarcel } 232 popstackmark(&smark); 233} 234 235 236 237/* 238 * Read /etc/profile or .profile. Return on error. 239 */ 240 241static void 242read_profile(const char *name) 243{ 244 int fd; 245 const char *expandedname; 246 247 expandedname = expandstr(name); 248 if (expandedname == NULL) 249 return; 250 INTOFF; 251 if ((fd = open(expandedname, O_RDONLY)) >= 0) 252 setinputfd(fd, 1); 253 INTON; 254 if (fd < 0) 255 return; 256 cmdloop(0); 257 popfile(); 258} 259 260 261 262/* 263 * Read a file containing shell functions. 264 */ 265 266void 267readcmdfile(const char *name) 268{ 269 setinputfile(name, 1); 270 cmdloop(0); 271 popfile(); 272} 273 274 275 276/* 277 * Take commands from a file. To be compatible we should do a path 278 * search for the file, which is necessary to find sub-commands. 279 */ 280 281 282static char * 283find_dot_file(char *basename) 284{ 285 char *fullname; 286 const char *path = pathval(); 287 struct stat statb; 288 289 /* don't try this for absolute or relative paths */ 290 if( strchr(basename, '/')) 291 return basename; 292 293 while ((fullname = padvance(&path, basename)) != NULL) { 294 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { 295 /* 296 * Don't bother freeing here, since it will 297 * be freed by the caller. 298 */ 299 return fullname; 300 } 301 stunalloc(fullname); 302 } 303 return basename; 304} 305 306int 307dotcmd(int argc, char **argv) 308{ 309 char *filename, *fullname; 310 311 if (argc < 2) 312 error("missing filename"); 313 314 exitstatus = 0; 315 316 /* 317 * Because we have historically not supported any options, 318 * only treat "--" specially. 319 */ 320 filename = argc > 2 && strcmp(argv[1], "--") == 0 ? argv[2] : argv[1]; 321 322 fullname = find_dot_file(filename); 323 setinputfile(fullname, 1); 324 commandname = fullname; 325 cmdloop(0); 326 popfile(); 327 return exitstatus; 328} 329 330 331int 332exitcmd(int argc, char **argv) 333{ 334 if (stoppedjobs()) 335 return 0; 336 if (argc > 1) 337 exitshell(number(argv[1])); 338 else 339 exitshell_savedstatus(); 340} 341