main.c revision 20425
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 3. All advertising materials mentioning features or use of this software 171556Srgrimes * must display the following acknowledgement: 181556Srgrimes * This product includes software developed by the University of 191556Srgrimes * California, Berkeley and its contributors. 201556Srgrimes * 4. Neither the name of the University nor the names of its contributors 211556Srgrimes * may be used to endorse or promote products derived from this software 221556Srgrimes * without specific prior written permission. 231556Srgrimes * 241556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341556Srgrimes * SUCH DAMAGE. 353044Sdg * 3620425Ssteve * $Id: main.c,v 1.9 1996/10/29 03:12:47 steve Exp $ 371556Srgrimes */ 381556Srgrimes 391556Srgrimes#ifndef lint 4020425Sstevestatic char const copyright[] = 411556Srgrimes"@(#) Copyright (c) 1991, 1993\n\ 421556Srgrimes The Regents of the University of California. All rights reserved.\n"; 431556Srgrimes#endif /* not lint */ 441556Srgrimes 451556Srgrimes#ifndef lint 4620425Sstevestatic char const sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/28/95"; 471556Srgrimes#endif /* not lint */ 481556Srgrimes 4917987Speter#include <stdio.h> 501556Srgrimes#include <signal.h> 5117987Speter#include <sys/stat.h> 5217987Speter#include <unistd.h> 531556Srgrimes#include <fcntl.h> 5417525Sache#include <locale.h> 5517525Sache 5617987Speter 571556Srgrimes#include "shell.h" 581556Srgrimes#include "main.h" 591556Srgrimes#include "mail.h" 601556Srgrimes#include "options.h" 611556Srgrimes#include "output.h" 621556Srgrimes#include "parser.h" 631556Srgrimes#include "nodes.h" 6417987Speter#include "expand.h" 651556Srgrimes#include "eval.h" 661556Srgrimes#include "jobs.h" 671556Srgrimes#include "input.h" 681556Srgrimes#include "trap.h" 691556Srgrimes#include "var.h" 7017987Speter#include "show.h" 711556Srgrimes#include "memalloc.h" 721556Srgrimes#include "error.h" 731556Srgrimes#include "init.h" 741556Srgrimes#include "mystring.h" 7517987Speter#include "exec.h" 7620425Ssteve#include "cd.h" 771556Srgrimes 781556Srgrimes#define PROFILE 0 791556Srgrimes 801556Srgrimesint rootpid; 811556Srgrimesint rootshell; 821556Srgrimesextern int errno; 831556Srgrimes#if PROFILE 841556Srgrimesshort profile_buf[16384]; 851556Srgrimesextern int etext(); 861556Srgrimes#endif 871556Srgrimes 8817987SpeterSTATIC void read_profile __P((char *)); 8917987SpeterSTATIC char *find_dot_file __P((char *)); 901556Srgrimes 911556Srgrimes/* 921556Srgrimes * Main routine. We initialize things, parse the arguments, execute 931556Srgrimes * profiles if we're a login shell, and then call cmdloop to execute 941556Srgrimes * commands. The setjmp call sets up the location to jump to when an 951556Srgrimes * exception occurs. When an exception occurs the variable "state" 961556Srgrimes * is used to figure out how far we had gotten. 971556Srgrimes */ 981556Srgrimes 9917987Speterint 10017987Spetermain(argc, argv) 10117987Speter int argc; 10220425Ssteve char **argv; 10317987Speter{ 1041556Srgrimes struct jmploc jmploc; 1051556Srgrimes struct stackmark smark; 1061556Srgrimes volatile int state; 1071556Srgrimes char *shinit; 1081556Srgrimes 1091556Srgrimes#if PROFILE 1101556Srgrimes monitor(4, etext, profile_buf, sizeof profile_buf, 50); 1111556Srgrimes#endif 11217525Sache (void) setlocale(LC_ALL, ""); 1131556Srgrimes state = 0; 1141556Srgrimes if (setjmp(jmploc.loc)) { 1151556Srgrimes /* 1161556Srgrimes * When a shell procedure is executed, we raise the 1171556Srgrimes * exception EXSHELLPROC to clean up before executing 1181556Srgrimes * the shell procedure. 1191556Srgrimes */ 12020425Ssteve switch (exception) { 12120425Ssteve case EXSHELLPROC: 1221556Srgrimes rootpid = getpid(); 1231556Srgrimes rootshell = 1; 1241556Srgrimes minusc = NULL; 1251556Srgrimes state = 3; 12620425Ssteve break; 12720425Ssteve 12820425Ssteve case EXEXEC: 12920425Ssteve exitstatus = exerrno; 13020425Ssteve break; 13120425Ssteve 13220425Ssteve case EXERROR: 13320425Ssteve exitstatus = 2; 13420425Ssteve break; 13520425Ssteve 13620425Ssteve default: 13720425Ssteve break; 13820425Ssteve } 13920425Ssteve 14020425Ssteve if (exception != EXSHELLPROC) { 14120425Ssteve if (state == 0 || iflag == 0 || ! rootshell) 14220425Ssteve exitshell(exitstatus); 14320425Ssteve } 1441556Srgrimes reset(); 1451556Srgrimes if (exception == EXINT 1461556Srgrimes#if ATTY 1471556Srgrimes && (! attyset() || equal(termval(), "emacs")) 1481556Srgrimes#endif 1491556Srgrimes ) { 1501556Srgrimes out2c('\n'); 1511556Srgrimes flushout(&errout); 1521556Srgrimes } 1531556Srgrimes popstackmark(&smark); 1541556Srgrimes FORCEINTON; /* enable interrupts */ 1551556Srgrimes if (state == 1) 1561556Srgrimes goto state1; 1571556Srgrimes else if (state == 2) 1581556Srgrimes goto state2; 1591556Srgrimes else if (state == 3) 1601556Srgrimes goto state3; 1611556Srgrimes else 1621556Srgrimes goto state4; 1631556Srgrimes } 1641556Srgrimes handler = &jmploc; 1651556Srgrimes#ifdef DEBUG 1661556Srgrimes opentrace(); 1671556Srgrimes trputs("Shell args: "); trargs(argv); 1681556Srgrimes#endif 1691556Srgrimes rootpid = getpid(); 1701556Srgrimes rootshell = 1; 1711556Srgrimes init(); 1721556Srgrimes setstackmark(&smark); 1731556Srgrimes procargs(argc, argv); 17420425Ssteve getpwd(); 1751556Srgrimes if (argv[0] && argv[0][0] == '-') { 1761556Srgrimes state = 1; 1771556Srgrimes read_profile("/etc/profile"); 1781556Srgrimesstate1: 1791556Srgrimes state = 2; 18019240Ssteve if (privileged == 0) 18119240Ssteve read_profile(".profile"); 18219240Ssteve else 18319240Ssteve read_profile("/etc/suid_profile"); 1848855Srgrimes } 1851556Srgrimesstate2: 1861556Srgrimes state = 3; 18719240Ssteve if (privileged == 0) { 18817987Speter if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 18917987Speter state = 3; 19017987Speter read_profile(shinit); 19117987Speter } 1921556Srgrimes } 1931556Srgrimesstate3: 1941556Srgrimes state = 4; 1951556Srgrimes if (minusc) { 1961556Srgrimes evalstring(minusc); 1971556Srgrimes } 1981556Srgrimes if (sflag || minusc == NULL) { 1991556Srgrimesstate4: /* XXX ??? - why isn't this before the "if" statement */ 2001556Srgrimes cmdloop(1); 2011556Srgrimes } 2021556Srgrimes#if PROFILE 2031556Srgrimes monitor(0); 2041556Srgrimes#endif 2051556Srgrimes exitshell(exitstatus); 20617987Speter /*NOTREACHED*/ 20717987Speter return 0; 2081556Srgrimes} 2091556Srgrimes 2101556Srgrimes 2111556Srgrimes/* 2121556Srgrimes * Read and execute commands. "Top" is nonzero for the top level command 2131556Srgrimes * loop; it turns on prompting if the shell is interactive. 2141556Srgrimes */ 2151556Srgrimes 2161556Srgrimesvoid 21720425Sstevecmdloop(top) 21817987Speter int top; 21917987Speter{ 2201556Srgrimes union node *n; 2211556Srgrimes struct stackmark smark; 2221556Srgrimes int inter; 2231556Srgrimes int numeof = 0; 2241556Srgrimes 2251556Srgrimes TRACE(("cmdloop(%d) called\n", top)); 2261556Srgrimes setstackmark(&smark); 2271556Srgrimes for (;;) { 2281556Srgrimes if (pendingsigs) 2291556Srgrimes dotrap(); 2301556Srgrimes inter = 0; 2311556Srgrimes if (iflag && top) { 2321556Srgrimes inter++; 2331556Srgrimes showjobs(1); 2341556Srgrimes chkmail(0); 2351556Srgrimes flushout(&output); 2361556Srgrimes } 2371556Srgrimes n = parsecmd(inter); 2381556Srgrimes /* showtree(n); DEBUG */ 2391556Srgrimes if (n == NEOF) { 2401556Srgrimes if (!top || numeof >= 50) 2411556Srgrimes break; 2421556Srgrimes if (!stoppedjobs()) { 2431556Srgrimes if (!Iflag) 2441556Srgrimes break; 2451556Srgrimes out2str("\nUse \"exit\" to leave shell.\n"); 2461556Srgrimes } 2471556Srgrimes numeof++; 2481556Srgrimes } else if (n != NULL && nflag == 0) { 2491556Srgrimes job_warning = (job_warning == 2) ? 1 : 0; 2501556Srgrimes numeof = 0; 2511556Srgrimes evaltree(n, 0); 2521556Srgrimes } 2531556Srgrimes popstackmark(&smark); 25420425Ssteve if (evalskip == SKIPFILE) { 25520425Ssteve evalskip = 0; 25620425Ssteve break; 25720425Ssteve } 2581556Srgrimes } 2591556Srgrimes popstackmark(&smark); /* unnecessary */ 2601556Srgrimes} 2611556Srgrimes 2621556Srgrimes 2631556Srgrimes 2641556Srgrimes/* 2651556Srgrimes * Read /etc/profile or .profile. Return on error. 2661556Srgrimes */ 2671556Srgrimes 2681556SrgrimesSTATIC void 2691556Srgrimesread_profile(name) 2701556Srgrimes char *name; 2711556Srgrimes { 2721556Srgrimes int fd; 2731556Srgrimes 2741556Srgrimes INTOFF; 2751556Srgrimes if ((fd = open(name, O_RDONLY)) >= 0) 2761556Srgrimes setinputfd(fd, 1); 2771556Srgrimes INTON; 2781556Srgrimes if (fd < 0) 2791556Srgrimes return; 2801556Srgrimes cmdloop(0); 2811556Srgrimes popfile(); 2821556Srgrimes} 2831556Srgrimes 2841556Srgrimes 2851556Srgrimes 2861556Srgrimes/* 2871556Srgrimes * Read a file containing shell functions. 2881556Srgrimes */ 2891556Srgrimes 2901556Srgrimesvoid 2911556Srgrimesreadcmdfile(name) 2921556Srgrimes char *name; 29317987Speter{ 2941556Srgrimes int fd; 2951556Srgrimes 2961556Srgrimes INTOFF; 2971556Srgrimes if ((fd = open(name, O_RDONLY)) >= 0) 2981556Srgrimes setinputfd(fd, 1); 2991556Srgrimes else 3001556Srgrimes error("Can't open %s", name); 3011556Srgrimes INTON; 3021556Srgrimes cmdloop(0); 3031556Srgrimes popfile(); 3041556Srgrimes} 3051556Srgrimes 3061556Srgrimes 3071556Srgrimes 3081556Srgrimes/* 3091556Srgrimes * Take commands from a file. To be compatable we should do a path 31017987Speter * search for the file, which is necessary to find sub-commands. 3111556Srgrimes */ 3121556Srgrimes 31317987Speter 31417987SpeterSTATIC char * 31517987Speterfind_dot_file(basename) 31617987Speter char *basename; 31717987Speter{ 31817987Speter static char localname[FILENAME_MAX+1]; 31917987Speter char *fullname; 32017987Speter char *path = pathval(); 32117987Speter struct stat statb; 32217987Speter 32317987Speter /* don't try this for absolute or relative paths */ 32417987Speter if( strchr(basename, '/')) 32517987Speter return basename; 32617987Speter 32717987Speter while ((fullname = padvance(&path, basename)) != NULL) { 32817987Speter strcpy(localname, fullname); 32917987Speter stunalloc(fullname); 33017987Speter if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 33117987Speter return localname; 33217987Speter } 33317987Speter return basename; 33417987Speter} 33517987Speter 33617987Speterint 33720425Sstevedotcmd(argc, argv) 33817987Speter int argc; 33920425Ssteve char **argv; 34017987Speter{ 34117987Speter struct strlist *sp; 3421556Srgrimes exitstatus = 0; 34317987Speter 34417987Speter for (sp = cmdenviron; sp ; sp = sp->next) 34517987Speter setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); 34617987Speter 3471556Srgrimes if (argc >= 2) { /* That's what SVR2 does */ 34817987Speter char *fullname = find_dot_file(argv[1]); 34917987Speter 35017987Speter setinputfile(fullname, 1); 35117987Speter commandname = fullname; 3521556Srgrimes cmdloop(0); 3531556Srgrimes popfile(); 3541556Srgrimes } 3551556Srgrimes return exitstatus; 3561556Srgrimes} 3571556Srgrimes 3581556Srgrimes 35917987Speterint 36020425Ssteveexitcmd(argc, argv) 36117987Speter int argc; 36220425Ssteve char **argv; 36317987Speter{ 36418267Sadam extern int oexitstatus; 36518267Sadam 3661556Srgrimes if (stoppedjobs()) 36717987Speter return 0; 36820425Ssteve if (argc > 1) 36920425Ssteve exitstatus = number(argv[1]); 37020425Ssteve else 37120425Ssteve exitstatus = oexitstatus; 37218254Sbde exitshell(exitstatus); 37317987Speter /*NOTREACHED*/ 37417987Speter return 0; 3751556Srgrimes} 3761556Srgrimes 3771556Srgrimes 3781556Srgrimes#ifdef notdef 3791556Srgrimes/* 3801556Srgrimes * Should never be called. 3811556Srgrimes */ 3821556Srgrimes 3831556Srgrimesvoid 3841556Srgrimesexit(exitstatus) { 3851556Srgrimes _exit(exitstatus); 3861556Srgrimes} 3871556Srgrimes#endif 388