main.c revision 99110
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. 351556Srgrimes */ 361556Srgrimes 371556Srgrimes#ifndef lint 3820425Sstevestatic char const copyright[] = 391556Srgrimes"@(#) Copyright (c) 1991, 1993\n\ 401556Srgrimes The Regents of the University of California. All rights reserved.\n"; 411556Srgrimes#endif /* not lint */ 421556Srgrimes 431556Srgrimes#ifndef lint 4436150Scharnier#if 0 4536150Scharnierstatic char sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/28/95"; 4636150Scharnier#endif 471556Srgrimes#endif /* not lint */ 4899110Sobrien#include <sys/cdefs.h> 4999110Sobrien__FBSDID("$FreeBSD: head/bin/sh/main.c 99110 2002-06-30 05:15:05Z obrien $"); 501556Srgrimes 5117987Speter#include <stdio.h> 521556Srgrimes#include <signal.h> 5317987Speter#include <sys/stat.h> 5417987Speter#include <unistd.h> 551556Srgrimes#include <fcntl.h> 5617525Sache#include <locale.h> 5759214Simp#include <errno.h> 5817525Sache 591556Srgrimes#include "shell.h" 601556Srgrimes#include "main.h" 611556Srgrimes#include "mail.h" 621556Srgrimes#include "options.h" 631556Srgrimes#include "output.h" 641556Srgrimes#include "parser.h" 651556Srgrimes#include "nodes.h" 6617987Speter#include "expand.h" 671556Srgrimes#include "eval.h" 681556Srgrimes#include "jobs.h" 691556Srgrimes#include "input.h" 701556Srgrimes#include "trap.h" 711556Srgrimes#include "var.h" 7217987Speter#include "show.h" 731556Srgrimes#include "memalloc.h" 741556Srgrimes#include "error.h" 751556Srgrimes#include "init.h" 761556Srgrimes#include "mystring.h" 7717987Speter#include "exec.h" 7820425Ssteve#include "cd.h" 791556Srgrimes 801556Srgrimes#define PROFILE 0 811556Srgrimes 821556Srgrimesint rootpid; 831556Srgrimesint rootshell; 841556Srgrimes#if PROFILE 851556Srgrimesshort profile_buf[16384]; 861556Srgrimesextern int etext(); 871556Srgrimes#endif 881556Srgrimes 8990111SimpSTATIC void read_profile(char *); 9090111SimpSTATIC char *find_dot_file(char *); 911556Srgrimes 921556Srgrimes/* 931556Srgrimes * Main routine. We initialize things, parse the arguments, execute 941556Srgrimes * profiles if we're a login shell, and then call cmdloop to execute 951556Srgrimes * commands. The setjmp call sets up the location to jump to when an 961556Srgrimes * exception occurs. When an exception occurs the variable "state" 971556Srgrimes * is used to figure out how far we had gotten. 981556Srgrimes */ 991556Srgrimes 10017987Speterint 10190111Simpmain(int argc, char *argv[]) 10217987Speter{ 1031556Srgrimes struct jmploc jmploc; 1041556Srgrimes struct stackmark smark; 1051556Srgrimes volatile int state; 1061556Srgrimes char *shinit; 1071556Srgrimes 1081556Srgrimes#if PROFILE 1091556Srgrimes monitor(4, etext, profile_buf, sizeof profile_buf, 50); 1101556Srgrimes#endif 11117525Sache (void) setlocale(LC_ALL, ""); 1121556Srgrimes state = 0; 1131556Srgrimes if (setjmp(jmploc.loc)) { 1141556Srgrimes /* 1151556Srgrimes * When a shell procedure is executed, we raise the 1161556Srgrimes * exception EXSHELLPROC to clean up before executing 1171556Srgrimes * the shell procedure. 1181556Srgrimes */ 11920425Ssteve switch (exception) { 12020425Ssteve case EXSHELLPROC: 1211556Srgrimes rootpid = getpid(); 1221556Srgrimes rootshell = 1; 1231556Srgrimes minusc = NULL; 1241556Srgrimes state = 3; 12520425Ssteve break; 12620425Ssteve 12720425Ssteve case EXEXEC: 12820425Ssteve exitstatus = exerrno; 12920425Ssteve break; 13020425Ssteve 13120425Ssteve case EXERROR: 13220425Ssteve exitstatus = 2; 13320425Ssteve break; 13420425Ssteve 13520425Ssteve default: 13620425Ssteve break; 13720425Ssteve } 13820425Ssteve 13920425Ssteve if (exception != EXSHELLPROC) { 14020425Ssteve if (state == 0 || iflag == 0 || ! rootshell) 14120425Ssteve exitshell(exitstatus); 14220425Ssteve } 1431556Srgrimes reset(); 1441556Srgrimes if (exception == EXINT 1451556Srgrimes#if ATTY 1461556Srgrimes && (! attyset() || equal(termval(), "emacs")) 1471556Srgrimes#endif 1481556Srgrimes ) { 1491556Srgrimes out2c('\n'); 1501556Srgrimes flushout(&errout); 1511556Srgrimes } 1521556Srgrimes popstackmark(&smark); 1531556Srgrimes FORCEINTON; /* enable interrupts */ 1541556Srgrimes if (state == 1) 1551556Srgrimes goto state1; 1561556Srgrimes else if (state == 2) 1571556Srgrimes goto state2; 1581556Srgrimes else if (state == 3) 1591556Srgrimes goto state3; 1601556Srgrimes else 1611556Srgrimes goto state4; 1621556Srgrimes } 1631556Srgrimes handler = &jmploc; 1641556Srgrimes#ifdef DEBUG 1651556Srgrimes opentrace(); 1661556Srgrimes trputs("Shell args: "); trargs(argv); 1671556Srgrimes#endif 1681556Srgrimes rootpid = getpid(); 1691556Srgrimes rootshell = 1; 1701556Srgrimes init(); 1711556Srgrimes setstackmark(&smark); 1721556Srgrimes procargs(argc, argv); 17320774Ssteve if (getpwd() == NULL && iflag) 17420774Ssteve out2str("sh: cannot determine working directory\n"); 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; 18725471Ssteve if (!privileged && iflag) { 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 21790111Simpcmdloop(int top) 21817987Speter{ 2191556Srgrimes union node *n; 2201556Srgrimes struct stackmark smark; 2211556Srgrimes int inter; 2221556Srgrimes int numeof = 0; 2231556Srgrimes 2241556Srgrimes TRACE(("cmdloop(%d) called\n", top)); 2251556Srgrimes setstackmark(&smark); 2261556Srgrimes for (;;) { 2271556Srgrimes if (pendingsigs) 2281556Srgrimes dotrap(); 2291556Srgrimes inter = 0; 2301556Srgrimes if (iflag && top) { 2311556Srgrimes inter++; 23297669Stjr showjobs(1, 0, 0); 2331556Srgrimes chkmail(0); 2341556Srgrimes flushout(&output); 2351556Srgrimes } 2361556Srgrimes n = parsecmd(inter); 2371556Srgrimes /* showtree(n); DEBUG */ 2381556Srgrimes if (n == NEOF) { 2391556Srgrimes if (!top || numeof >= 50) 2401556Srgrimes break; 2411556Srgrimes if (!stoppedjobs()) { 2421556Srgrimes if (!Iflag) 2431556Srgrimes break; 2441556Srgrimes out2str("\nUse \"exit\" to leave shell.\n"); 2451556Srgrimes } 2461556Srgrimes numeof++; 2471556Srgrimes } else if (n != NULL && nflag == 0) { 2481556Srgrimes job_warning = (job_warning == 2) ? 1 : 0; 2491556Srgrimes numeof = 0; 2501556Srgrimes evaltree(n, 0); 2511556Srgrimes } 2521556Srgrimes popstackmark(&smark); 25364702Scracauer setstackmark(&smark); 25420425Ssteve if (evalskip == SKIPFILE) { 25520425Ssteve evalskip = 0; 25620425Ssteve break; 25720425Ssteve } 2581556Srgrimes } 25964702Scracauer popstackmark(&smark); 2601556Srgrimes} 2611556Srgrimes 2621556Srgrimes 2631556Srgrimes 2641556Srgrimes/* 2651556Srgrimes * Read /etc/profile or .profile. Return on error. 2661556Srgrimes */ 2671556Srgrimes 2681556SrgrimesSTATIC void 26990111Simpread_profile(char *name) 27090111Simp{ 2711556Srgrimes int fd; 2721556Srgrimes 2731556Srgrimes INTOFF; 2741556Srgrimes if ((fd = open(name, O_RDONLY)) >= 0) 2751556Srgrimes setinputfd(fd, 1); 2761556Srgrimes INTON; 2771556Srgrimes if (fd < 0) 2781556Srgrimes return; 2791556Srgrimes cmdloop(0); 2801556Srgrimes popfile(); 2811556Srgrimes} 2821556Srgrimes 2831556Srgrimes 2841556Srgrimes 2851556Srgrimes/* 2861556Srgrimes * Read a file containing shell functions. 2871556Srgrimes */ 2881556Srgrimes 2891556Srgrimesvoid 29090111Simpreadcmdfile(char *name) 29117987Speter{ 2921556Srgrimes int fd; 2931556Srgrimes 2941556Srgrimes INTOFF; 2951556Srgrimes if ((fd = open(name, O_RDONLY)) >= 0) 2961556Srgrimes setinputfd(fd, 1); 2971556Srgrimes else 29853891Scracauer error("Can't open %s: %s", name, strerror(errno)); 2991556Srgrimes INTON; 3001556Srgrimes cmdloop(0); 3011556Srgrimes popfile(); 3021556Srgrimes} 3031556Srgrimes 3041556Srgrimes 3051556Srgrimes 3061556Srgrimes/* 30746684Skris * Take commands from a file. To be compatible we should do a path 30817987Speter * search for the file, which is necessary to find sub-commands. 3091556Srgrimes */ 3101556Srgrimes 31117987Speter 31217987SpeterSTATIC char * 31390111Simpfind_dot_file(char *basename) 31417987Speter{ 31517987Speter static char localname[FILENAME_MAX+1]; 31617987Speter char *fullname; 31717987Speter char *path = pathval(); 31817987Speter struct stat statb; 31917987Speter 32017987Speter /* don't try this for absolute or relative paths */ 32117987Speter if( strchr(basename, '/')) 32217987Speter return basename; 32317987Speter 32417987Speter while ((fullname = padvance(&path, basename)) != NULL) { 32517987Speter strcpy(localname, fullname); 32617987Speter stunalloc(fullname); 32717987Speter if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 32817987Speter return localname; 32917987Speter } 33017987Speter return basename; 33117987Speter} 33217987Speter 33317987Speterint 33490111Simpdotcmd(int argc, char **argv) 33517987Speter{ 33617987Speter struct strlist *sp; 3371556Srgrimes exitstatus = 0; 33817987Speter 33917987Speter for (sp = cmdenviron; sp ; sp = sp->next) 34017987Speter setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); 34117987Speter 3421556Srgrimes if (argc >= 2) { /* That's what SVR2 does */ 34317987Speter char *fullname = find_dot_file(argv[1]); 34417987Speter 34517987Speter setinputfile(fullname, 1); 34617987Speter commandname = fullname; 3471556Srgrimes cmdloop(0); 3481556Srgrimes popfile(); 3491556Srgrimes } 3501556Srgrimes return exitstatus; 3511556Srgrimes} 3521556Srgrimes 3531556Srgrimes 35417987Speterint 35590111Simpexitcmd(int argc, char **argv) 35617987Speter{ 35718267Sadam extern int oexitstatus; 35818267Sadam 3591556Srgrimes if (stoppedjobs()) 36017987Speter return 0; 36120425Ssteve if (argc > 1) 36220425Ssteve exitstatus = number(argv[1]); 36320425Ssteve else 36420425Ssteve exitstatus = oexitstatus; 36518254Sbde exitshell(exitstatus); 36617987Speter /*NOTREACHED*/ 36717987Speter return 0; 3681556Srgrimes} 369