327 lines
6.9 KiB
C
327 lines
6.9 KiB
C
/*-
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1991 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)main.c 5.2 (Berkeley) 3/13/91";
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static char rcsid[] = "$Header: /cvsroot/src/bin/sh/main.c,v 1.3 1993/03/23 00:28:22 cgd Exp $";
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#endif /* not lint */
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#include <signal.h>
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#include <fcntl.h>
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#include "shell.h"
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#include "main.h"
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#include "mail.h"
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#include "options.h"
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#include "output.h"
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#include "parser.h"
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#include "nodes.h"
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#include "eval.h"
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#include "jobs.h"
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#include "input.h"
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#include "trap.h"
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#if ATTY
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#include "var.h"
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#endif
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#include "memalloc.h"
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#include "error.h"
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#include "init.h"
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#include "mystring.h"
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#define PROFILE 0
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int rootpid;
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int rootshell;
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STATIC union node *curcmd;
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STATIC union node *prevcmd;
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extern int errno;
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#if PROFILE
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short profile_buf[16384];
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extern int etext();
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#endif
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#ifdef __STDC__
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STATIC void read_profile(char *);
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char *getenv(char *);
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#else
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STATIC void read_profile();
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char *getenv();
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#endif
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/*
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* Main routine. We initialize things, parse the arguments, execute
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* profiles if we're a login shell, and then call cmdloop to execute
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* commands. The setjmp call sets up the location to jump to when an
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* exception occurs. When an exception occurs the variable "state"
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* is used to figure out how far we had gotten.
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*/
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main(argc, argv) char **argv; {
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struct jmploc jmploc;
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struct stackmark smark;
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volatile int state;
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char *shinit;
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#if PROFILE
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monitor(4, etext, profile_buf, sizeof profile_buf, 50);
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#endif
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state = 0;
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if (setjmp(jmploc.loc)) {
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/*
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* When a shell procedure is executed, we raise the
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* exception EXSHELLPROC to clean up before executing
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* the shell procedure.
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*/
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if (exception == EXSHELLPROC) {
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rootpid = getpid();
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rootshell = 1;
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minusc = NULL;
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state = 3;
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} else if (state == 0 || iflag == 0 || ! rootshell)
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exitshell(2);
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reset();
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#if ATTY
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if (exception == EXINT
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&& (! attyset() || equal(termval(), "emacs"))) {
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#else
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if (exception == EXINT) {
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#endif
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out2c('\n');
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flushout(&errout);
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}
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popstackmark(&smark);
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FORCEINTON; /* enable interrupts */
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if (state == 1)
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goto state1;
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else if (state == 2)
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goto state2;
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else
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goto state3;
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}
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handler = &jmploc;
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#ifdef DEBUG
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opentrace();
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trputs("Shell args: "); trargs(argv);
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#endif
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rootpid = getpid();
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rootshell = 1;
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init();
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setstackmark(&smark);
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procargs(argc, argv);
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if (argv[0] && argv[0][0] == '-') {
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state = 1;
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read_profile("/etc/profile");
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state1:
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state = 2;
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read_profile(".profile");
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} else if ((sflag || minusc) && (shinit = getenv("SHINIT")) != NULL) {
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state = 2;
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evalstring(shinit);
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}
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state2:
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state = 3;
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if (minusc) {
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evalstring(minusc);
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}
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if (sflag || minusc == NULL) {
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state3:
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cmdloop(1);
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}
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#if PROFILE
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monitor(0);
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#endif
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exitshell(exitstatus);
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}
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/*
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* Read and execute commands. "Top" is nonzero for the top level command
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* loop; it turns on prompting if the shell is interactive.
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*/
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void
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cmdloop(top) {
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union node *n;
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struct stackmark smark;
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int inter;
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int numeof;
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TRACE(("cmdloop(%d) called\n", top));
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setstackmark(&smark);
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numeof = 0;
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for (;;) {
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if (pendingsigs)
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dotrap();
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inter = 0;
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if (iflag && top) {
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inter++;
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showjobs(1);
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chkmail(0);
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flushout(&output);
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}
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n = parsecmd(inter);
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#ifdef DEBUG
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/* showtree(n); */
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#endif
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if (n == NEOF) {
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if (Iflag == 0 || numeof >= 50)
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break;
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out2str("\nUse \"exit\" to leave shell.\n");
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numeof++;
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} else if (n != NULL && nflag == 0) {
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if (inter) {
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INTOFF;
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if (prevcmd)
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freefunc(prevcmd);
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prevcmd = curcmd;
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curcmd = copyfunc(n);
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INTON;
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}
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evaltree(n, 0);
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#ifdef notdef
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if (exitstatus) /*DEBUG*/
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outfmt(&errout, "Exit status 0x%X\n", exitstatus);
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#endif
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}
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popstackmark(&smark);
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}
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popstackmark(&smark); /* unnecessary */
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}
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/*
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* Read /etc/profile or .profile. Return on error.
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*/
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STATIC void
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read_profile(name)
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char *name;
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{
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int fd;
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INTOFF;
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if ((fd = open(name, O_RDONLY)) >= 0)
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setinputfd(fd, 1);
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INTON;
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if (fd < 0)
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return;
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cmdloop(0);
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popfile();
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}
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/*
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* Read a file containing shell functions.
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*/
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void
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readcmdfile(name)
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char *name;
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{
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int fd;
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INTOFF;
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if ((fd = open(name, O_RDONLY)) >= 0)
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setinputfd(fd, 1);
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else
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error("Can't open %s", name);
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INTON;
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cmdloop(0);
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popfile();
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}
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/*
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* Take commands from a file. To be compatable we should do a path
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* search for the file, but a path search doesn't make any sense.
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*/
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dotcmd(argc, argv) char **argv; {
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exitstatus = 0;
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if (argc >= 2) { /* That's what SVR2 does */
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setinputfile(argv[1], 1);
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commandname = argv[1];
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cmdloop(0);
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popfile();
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}
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return exitstatus;
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}
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exitcmd(argc, argv) char **argv; {
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if (argc > 1)
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exitstatus = number(argv[1]);
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exitshell(exitstatus);
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}
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lccmd(argc, argv) char **argv; {
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if (argc > 1) {
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defun(argv[1], prevcmd);
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return 0;
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} else {
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INTOFF;
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freefunc(curcmd);
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curcmd = prevcmd;
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prevcmd = NULL;
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INTON;
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evaltree(curcmd, 0);
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return exitstatus;
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}
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}
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#ifdef notdef
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/*
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* Should never be called.
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*/
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void
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exit(exitstatus) {
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_exit(exitstatus);
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}
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#endif
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