main.c revision 19240
167754Smsmith/*- 267754Smsmith * Copyright (c) 1991, 1993 377424Smsmith * The Regents of the University of California. All rights reserved. 467754Smsmith * 567754Smsmith * This code is derived from software contributed to Berkeley by 667754Smsmith * Kenneth Almquist. 7217365Sjkim * 8306536Sjkim * Redistribution and use in source and binary forms, with or without 970243Smsmith * modification, are permitted provided that the following conditions 1067754Smsmith * are met: 11217365Sjkim * 1. Redistributions of source code must retain the above copyright 12217365Sjkim * notice, this list of conditions and the following disclaimer. 13217365Sjkim * 2. Redistributions in binary form must reproduce the above copyright 14217365Sjkim * notice, this list of conditions and the following disclaimer in the 15217365Sjkim * documentation and/or other materials provided with the distribution. 16217365Sjkim * 3. All advertising materials mentioning features or use of this software 17217365Sjkim * must display the following acknowledgement: 18217365Sjkim * This product includes software developed by the University of 19217365Sjkim * California, Berkeley and its contributors. 20217365Sjkim * 4. Neither the name of the University nor the names of its contributors 21217365Sjkim * may be used to endorse or promote products derived from this software 22217365Sjkim * without specific prior written permission. 23217365Sjkim * 24217365Sjkim * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2567754Smsmith * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26217365Sjkim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27217365Sjkim * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28217365Sjkim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2967754Smsmith * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30217365Sjkim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31217365Sjkim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32217365Sjkim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33217365Sjkim * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34217365Sjkim * SUCH DAMAGE. 35217365Sjkim * 36217365Sjkim * $Id: main.c,v 1.8 1996/09/12 12:41:46 adam Exp $ 37217365Sjkim */ 38217365Sjkim 39217365Sjkim#ifndef lint 40217365Sjkimstatic char copyright[] = 41217365Sjkim"@(#) Copyright (c) 1991, 1993\n\ 42217365Sjkim The Regents of the University of California. All rights reserved.\n"; 4367754Smsmith#endif /* not lint */ 44193341Sjkim 45193341Sjkim#ifndef lint 46193341Sjkimstatic char sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/28/95"; 47193341Sjkim#endif /* not lint */ 48193341Sjkim 49193341Sjkim#include <stdio.h> 5067754Smsmith#include <signal.h> 5167754Smsmith#include <sys/stat.h> 5277424Smsmith#include <unistd.h> 5391116Smsmith#include <fcntl.h> 5467754Smsmith#include <locale.h> 55151937Sjkim 5667754Smsmith 57151937Sjkim#include "shell.h" 58151937Sjkim#include "main.h" 59151937Sjkim#include "mail.h" 60151937Sjkim#include "options.h" 61151937Sjkim#include "output.h" 62151937Sjkim#include "parser.h" 63281075Sdim#include "nodes.h" 64281075Sdim#include "expand.h" 65281075Sdim#include "eval.h" 66281075Sdim#include "jobs.h" 67281075Sdim#include "input.h" 68151937Sjkim#include "trap.h" 69281075Sdim#include "var.h" 7067754Smsmith#include "show.h" 7167754Smsmith#include "memalloc.h" 7277424Smsmith#include "error.h" 7367754Smsmith#include "init.h" 7485756Smsmith#include "mystring.h" 75238381Sjkim#include "exec.h" 76238381Sjkim 7787031Smsmith#define PROFILE 0 7887031Smsmith 7967754Smsmithint rootpid; 8067754Smsmithint rootshell; 8167754SmsmithSTATIC union node *curcmd; 8285756SmsmithSTATIC union node *prevcmd; 83238381Sjkimextern int errno; 8467754Smsmith#if PROFILE 8591116Smsmithshort profile_buf[16384]; 8687031Smsmithextern int etext(); 8767754Smsmith#endif 8867754Smsmith 8967754SmsmithSTATIC void read_profile __P((char *)); 9067754SmsmithSTATIC char *find_dot_file __P((char *)); 9177424Smsmith 9285756Smsmith/* 9367754Smsmith * Main routine. We initialize things, parse the arguments, execute 9467754Smsmith * profiles if we're a login shell, and then call cmdloop to execute 9567754Smsmith * commands. The setjmp call sets up the location to jump to when an 9667754Smsmith * exception occurs. When an exception occurs the variable "state" 9771867Smsmith * is used to figure out how far we had gotten. 9867754Smsmith */ 9967754Smsmith 100167802Sjkimint 10167754Smsmithmain(argc, argv) 10267754Smsmith int argc; 10367754Smsmith char **argv; 10467754Smsmith{ 10585756Smsmith struct jmploc jmploc; 10667754Smsmith struct stackmark smark; 107167802Sjkim volatile int state; 10867754Smsmith char *shinit; 10967754Smsmith 11067754Smsmith#if PROFILE 11171867Smsmith monitor(4, etext, profile_buf, sizeof profile_buf, 50); 11267754Smsmith#endif 11391116Smsmith (void) setlocale(LC_ALL, ""); 11467754Smsmith state = 0; 11577424Smsmith if (setjmp(jmploc.loc)) { 11671867Smsmith /* 117107325Siwasaki * When a shell procedure is executed, we raise the 11871867Smsmith * exception EXSHELLPROC to clean up before executing 11985756Smsmith * the shell procedure. 120306536Sjkim */ 121306536Sjkim if (exception == EXERROR) 12267754Smsmith exitstatus = 2; 12371867Smsmith if (exception == EXSHELLPROC) { 12467754Smsmith rootpid = getpid(); 12567754Smsmith rootshell = 1; 12699679Siwasaki minusc = NULL; 12767754Smsmith state = 3; 128193267Sjkim } else if (state == 0 || iflag == 0 || ! rootshell) 129102550Siwasaki exitshell(2); 130107325Siwasaki reset(); 131250838Sjkim if (exception == EXINT 13299679Siwasaki#if ATTY 13399679Siwasaki && (! attyset() || equal(termval(), "emacs")) 13499679Siwasaki#endif 13599679Siwasaki ) { 13699679Siwasaki out2c('\n'); 13799679Siwasaki flushout(&errout); 13899679Siwasaki } 13999679Siwasaki popstackmark(&smark); 14099679Siwasaki FORCEINTON; /* enable interrupts */ 14199679Siwasaki if (state == 1) 14299679Siwasaki goto state1; 143104470Siwasaki else if (state == 2) 14499679Siwasaki goto state2; 14599679Siwasaki else if (state == 3) 14699679Siwasaki goto state3; 147126372Snjl else 14867754Smsmith goto state4; 149167802Sjkim } 150306536Sjkim handler = &jmploc; 151138287Smarks#ifdef DEBUG 15267754Smsmith opentrace(); 15367754Smsmith trputs("Shell args: "); trargs(argv); 15467754Smsmith#endif 15567754Smsmith rootpid = getpid(); 15677424Smsmith rootshell = 1; 157193267Sjkim init(); 15871867Smsmith setstackmark(&smark); 15971867Smsmith procargs(argc, argv); 16071867Smsmith if (argv[0] && argv[0][0] == '-') { 16171867Smsmith state = 1; 16271867Smsmith read_profile("/etc/profile"); 16371867Smsmithstate1: 164193267Sjkim state = 2; 16567754Smsmith if (privileged == 0) 166193267Sjkim read_profile(".profile"); 16767754Smsmith else 16871867Smsmith read_profile("/etc/suid_profile"); 16971867Smsmith } 170151937Sjkimstate2: 171306536Sjkim state = 3; 172306536Sjkim if (privileged == 0) { 17371867Smsmith if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 17467754Smsmith state = 3; 175193267Sjkim read_profile(shinit); 17667754Smsmith } 17771867Smsmith } 17867754Smsmithstate3: 17985756Smsmith state = 4; 18071867Smsmith if (minusc) { 18171867Smsmith evalstring(minusc); 182193267Sjkim } 183193267Sjkim if (sflag || minusc == NULL) { 18471867Smsmithstate4: /* XXX ??? - why isn't this before the "if" statement */ 18577424Smsmith cmdloop(1); 18671867Smsmith } 187193267Sjkim#if PROFILE 188306536Sjkim monitor(0); 18971867Smsmith#endif 19071867Smsmith exitshell(exitstatus); 191193267Sjkim /*NOTREACHED*/ 19267754Smsmith return 0; 19371867Smsmith} 19471867Smsmith 19567754Smsmith 196138287Smarks/* 197306536Sjkim * Read and execute commands. "Top" is nonzero for the top level command 198138287Smarks * loop; it turns on prompting if the shell is interactive. 19977424Smsmith */ 200204773Sjkim 20171867Smsmithvoid 20271867Smsmithcmdloop(top) 20371867Smsmith int top; 20471867Smsmith{ 205204773Sjkim union node *n; 206193267Sjkim struct stackmark smark; 207193267Sjkim int inter; 20871867Smsmith int numeof = 0; 20971867Smsmith 21071867Smsmith TRACE(("cmdloop(%d) called\n", top)); 21199679Siwasaki setstackmark(&smark); 21271867Smsmith for (;;) { 21371867Smsmith if (pendingsigs) 21471867Smsmith dotrap(); 21571867Smsmith inter = 0; 21671867Smsmith if (iflag && top) { 21771867Smsmith inter++; 21871867Smsmith showjobs(1); 21977424Smsmith chkmail(0); 22071867Smsmith flushout(&output); 22187031Smsmith } 22287031Smsmith n = parsecmd(inter); 22387031Smsmith /* showtree(n); DEBUG */ 22471867Smsmith if (n == NEOF) { 22571867Smsmith if (!top || numeof >= 50) 22671867Smsmith break; 22787031Smsmith if (!stoppedjobs()) { 22871867Smsmith if (!Iflag) 22971867Smsmith break; 23071867Smsmith out2str("\nUse \"exit\" to leave shell.\n"); 231151937Sjkim } 23277424Smsmith numeof++; 23385756Smsmith } else if (n != NULL && nflag == 0) { 23491116Smsmith job_warning = (job_warning == 2) ? 1 : 0; 23571867Smsmith numeof = 0; 23671867Smsmith evaltree(n, 0); 23771867Smsmith } 23871867Smsmith popstackmark(&smark); 23991116Smsmith } 24071867Smsmith popstackmark(&smark); /* unnecessary */ 241126372Snjl} 24271867Smsmith 24371867Smsmith 244167802Sjkim 24571867Smsmith/* 24671867Smsmith * Read /etc/profile or .profile. Return on error. 24771867Smsmith */ 24871867Smsmith 24971867SmsmithSTATIC void 25071867Smsmithread_profile(name) 25191116Smsmith char *name; 25271867Smsmith { 25371867Smsmith int fd; 25471867Smsmith 255138287Smarks INTOFF; 256138287Smarks if ((fd = open(name, O_RDONLY)) >= 0) 257138287Smarks setinputfd(fd, 1); 258138287Smarks INTON; 25991116Smsmith if (fd < 0) 26091116Smsmith return; 261126372Snjl cmdloop(0); 26291116Smsmith popfile(); 26391116Smsmith} 26485756Smsmith 265193267Sjkim 266193267Sjkim 26791116Smsmith/* 268193267Sjkim * Read a file containing shell functions. 269193267Sjkim */ 270193267Sjkim 271193267Sjkimvoid 27291116Smsmithreadcmdfile(name) 273193267Sjkim char *name; 274193267Sjkim{ 275193267Sjkim int fd; 27667754Smsmith 277306536Sjkim INTOFF; 278306536Sjkim if ((fd = open(name, O_RDONLY)) >= 0) 279193267Sjkim setinputfd(fd, 1); 280193267Sjkim else 281193267Sjkim error("Can't open %s", name); 282193267Sjkim INTON; 283193267Sjkim cmdloop(0); 284193267Sjkim popfile(); 285138287Smarks} 28691116Smsmith 287138287Smarks 288104470Siwasaki 289151937Sjkim/* 290151937Sjkim * Take commands from a file. To be compatable we should do a path 291151937Sjkim * search for the file, which is necessary to find sub-commands. 292151937Sjkim */ 293104470Siwasaki 294138287Smarks 295104470SiwasakiSTATIC char * 296138287Smarksfind_dot_file(basename) 297151937Sjkim char *basename; 298138287Smarks{ 299126372Snjl static char localname[FILENAME_MAX+1]; 300151937Sjkim char *fullname; 301126372Snjl char *path = pathval(); 302151937Sjkim struct stat statb; 303151937Sjkim 304151937Sjkim /* don't try this for absolute or relative paths */ 305151937Sjkim if( strchr(basename, '/')) 306138287Smarks return basename; 307138287Smarks 30867754Smsmith while ((fullname = padvance(&path, basename)) != NULL) { 309151937Sjkim strcpy(localname, fullname); 31071867Smsmith stunalloc(fullname); 31167754Smsmith if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 31271867Smsmith return localname; 31367754Smsmith } 314138287Smarks return basename; 315138287Smarks} 31667754Smsmith 31787031Smsmithint 31887031Smsmithdotcmd(argc, argv) 31987031Smsmith int argc; 32067754Smsmith char **argv; 32167754Smsmith{ 32267754Smsmith struct strlist *sp; 323138287Smarks exitstatus = 0; 324138287Smarks 325138287Smarks for (sp = cmdenviron; sp ; sp = sp->next) 32667754Smsmith setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); 32791116Smsmith 328193267Sjkim if (argc >= 2) { /* That's what SVR2 does */ 329193267Sjkim char *fullname = find_dot_file(argv[1]); 33067754Smsmith 33171867Smsmith setinputfile(fullname, 1); 33267754Smsmith commandname = fullname; 33367754Smsmith cmdloop(0); 33467754Smsmith popfile(); 33567754Smsmith } 33667754Smsmith return exitstatus; 33767754Smsmith} 338193267Sjkim 33967754Smsmith 34071867Smsmithint 34187031Smsmithexitcmd(argc, argv) 34287031Smsmith int argc; 34387031Smsmith char **argv; 34487031Smsmith{ 34567754Smsmith extern int oexitstatus; 34667754Smsmith 34787031Smsmith if (stoppedjobs()) 348138287Smarks return 0; 34977424Smsmith exitstatus = (argc > 1) ? number(argv[1]) : oexitstatus; 350138287Smarks exitshell(exitstatus); 351138287Smarks /*NOTREACHED*/ 35287031Smsmith return 0; 35367754Smsmith} 35467754Smsmith 35567754Smsmith 35677424Smsmith#ifdef notdef 35787031Smsmith/* 35877424Smsmith * Should never be called. 359167802Sjkim */ 360306536Sjkim 36199679Siwasakivoid 36287031Smsmithexit(exitstatus) { 36367754Smsmith _exit(exitstatus); 36487031Smsmith} 36587031Smsmith#endif 36687031Smsmith