418 lines
9.0 KiB
C
418 lines
9.0 KiB
C
/* $NetBSD: main.c,v 1.86 2021/09/15 18:29:45 kre Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. 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. 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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1991, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)main.c 8.7 (Berkeley) 7/19/95";
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#else
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__RCSID("$NetBSD: main.c,v 1.86 2021/09/15 18:29:45 kre Exp $");
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#endif
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#endif /* not lint */
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#include <errno.h>
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#include <stdio.h>
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#include <signal.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <locale.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 "builtins.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 "expand.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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#include "var.h"
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#include "show.h"
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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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#include "exec.h"
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#include "cd.h"
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#include "redir.h"
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#define PROFILE 0
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int rootpid;
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int rootshell;
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struct jmploc main_handler;
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int max_user_fd;
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long user_fd_limit;
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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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STATIC void read_profile(const char *);
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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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int
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main(int argc, char **argv)
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{
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struct stackmark smark;
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volatile int state;
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char *shinit;
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uid_t uid;
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gid_t gid;
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sigset_t mask;
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/*
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* If we happen to be invoked with SIGCHLD ignored, we cannot
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* successfully do almost anything. Perhaps we should remember
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* its state and pass it on ignored to children if it was ignored
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* on entry, but that seems like just leaving the shit on the
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* footpath for someone else to fall into...
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*/
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(void)signal(SIGCHLD, SIG_DFL);
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/*
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* Similarly, SIGCHLD must not be blocked
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*/
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sigemptyset(&mask);
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sigaddset(&mask, SIGCHLD);
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sigprocmask(SIG_UNBLOCK, &mask, NULL);
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uid = getuid();
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gid = getgid();
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max_user_fd = fcntl(0, F_MAXFD);
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if (max_user_fd < 2)
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max_user_fd = 2;
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user_fd_limit = sysconf(_SC_OPEN_MAX);
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setlocale(LC_ALL, "");
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posix = getenv("POSIXLY_CORRECT") != NULL;
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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(main_handler.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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switch (exception) {
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case 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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break;
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case EXEXEC:
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exitstatus = exerrno;
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break;
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case EXERROR:
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exitstatus = 2;
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break;
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default:
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break;
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}
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if (exception != EXSHELLPROC) {
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if (state == 0 || iflag == 0 || ! rootshell ||
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exception == EXEXIT)
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exitshell(exitstatus);
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}
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reset();
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if (exception == EXINT) {
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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 if (state == 3)
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goto state3;
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else
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goto state4;
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}
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handler = &main_handler;
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#ifdef DEBUG
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#if DEBUG >= 2
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debug = 1; /* this may be reset by procargs() later */
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#endif
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opentrace();
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trputs("Shell args: "); trargs(argv);
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#if DEBUG >= 3
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set_debug(((DEBUG)==3 ? "_@" : "++"), 1);
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#endif
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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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initpwd();
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setstackmark(&smark);
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procargs(argc, argv);
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/*
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* Limit bogus system(3) or popen(3) calls in setuid binaries,
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* by requiring the -p flag
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*/
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if (!pflag && (uid != geteuid() || gid != getegid())) {
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setuid(uid);
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setgid(gid);
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/* PS1 might need to be changed accordingly. */
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choose_ps1();
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}
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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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}
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state2:
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state = 3;
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if ((iflag || !posix) &&
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getuid() == geteuid() && getgid() == getegid()) {
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struct stackmark env_smark;
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setstackmark(&env_smark);
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if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
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state = 3;
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read_profile(expandenv(shinit));
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}
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popstackmark(&env_smark);
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}
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state3:
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state = 4;
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line_number = 1; /* undo anything from profile files */
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if (sflag == 0 || minusc) {
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static int sigs[] = {
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SIGINT, SIGQUIT, SIGHUP,
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#ifdef SIGTSTP
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SIGTSTP,
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#endif
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SIGPIPE
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};
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#define SIGSSIZE (sizeof(sigs)/sizeof(sigs[0]))
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size_t i;
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for (i = 0; i < SIGSSIZE; i++)
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setsignal(sigs[i], 0);
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}
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if (minusc)
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evalstring(minusc, sflag ? 0 : EV_EXIT);
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if (sflag || minusc == NULL) {
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state4: /* XXX ??? - why isn't this before the "if" statement */
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cmdloop(1);
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if (iflag) {
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out2str("\n");
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flushout(&errout);
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}
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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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line_number = plinno;
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exitshell(exitstatus);
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/* NOTREACHED */
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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(int top)
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{
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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 = 0;
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enum skipstate skip;
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CTRACE(DBG_ALWAYS, ("cmdloop(%d) called\n", top));
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setstackmark(&smark);
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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 == 1 && top) {
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inter = 1;
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showjobs(out2, SHOW_CHANGED);
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chkmail(0);
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flushout(&errout);
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nflag = 0;
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}
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n = parsecmd(inter);
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VXTRACE(DBG_PARSE|DBG_EVAL|DBG_CMDS,("cmdloop: "),showtree(n));
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if (n == NEOF) {
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if (!top || numeof >= 50)
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break;
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if (nflag)
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break;
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if (!stoppedjobs()) {
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if (!iflag || !Iflag)
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break;
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out2str("\nUse \"exit\" to leave shell.\n");
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}
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numeof++;
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} else if (n != NULL && nflag == 0) {
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job_warning = (job_warning == 2) ? 1 : 0;
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numeof = 0;
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evaltree(n, 0);
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}
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rststackmark(&smark);
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/*
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* Any SKIP* can occur here! SKIP(FUNC|BREAK|CONT) occur when
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* a dotcmd is in a loop or a function body and appropriate
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* built-ins occurs in file scope in the sourced file. Values
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* other than SKIPFILE are reset by the appropriate eval*()
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* that contained the dotcmd() call.
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*/
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skip = current_skipstate();
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if (skip != SKIPNONE) {
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if (skip == SKIPFILE)
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stop_skipping();
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break;
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}
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}
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popstackmark(&smark);
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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(const char *name)
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{
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int fd;
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int xflag_set = 0;
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int vflag_set = 0;
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if (*name == '\0')
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return;
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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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/* -q turns off -x and -v just when executing init files */
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if (qflag) {
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if (xflag)
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xflag = 0, xflag_set = 1;
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if (vflag)
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vflag = 0, vflag_set = 1;
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}
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(void)set_dot_funcnest(1); /* allow profile to "return" */
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cmdloop(0);
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(void)set_dot_funcnest(0);
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if (qflag) {
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if (xflag_set)
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xflag = 1;
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if (vflag_set)
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vflag = 1;
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}
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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(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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int
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exitcmd(int argc, char **argv)
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{
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if (stoppedjobs())
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return 0;
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if (argc > 1)
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exitshell(number(argv[1]));
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else
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exitshell_savedstatus();
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/* NOTREACHED */
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}
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