From e3cfc8ce61f788739c66445d903f8beacb40c93d Mon Sep 17 00:00:00 2001 From: rgrimes Date: Thu, 26 May 1994 06:18:55 +0000 Subject: BSD 4.4 Lite bin Sources --- bin/sh/main.c | 304 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 304 insertions(+) create mode 100644 bin/sh/main.c (limited to 'bin/sh/main.c') diff --git a/bin/sh/main.c b/bin/sh/main.c new file mode 100644 index 0000000..dab9e64 --- /dev/null +++ b/bin/sh/main.c @@ -0,0 +1,304 @@ +/*- + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Kenneth Almquist. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char copyright[] = +"@(#) Copyright (c) 1991, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 5/31/93"; +#endif /* not lint */ + +#include +#include +#include "shell.h" +#include "main.h" +#include "mail.h" +#include "options.h" +#include "output.h" +#include "parser.h" +#include "nodes.h" +#include "eval.h" +#include "jobs.h" +#include "input.h" +#include "trap.h" +#include "var.h" +#include "memalloc.h" +#include "error.h" +#include "init.h" +#include "mystring.h" + +#define PROFILE 0 + +int rootpid; +int rootshell; +STATIC union node *curcmd; +STATIC union node *prevcmd; +extern int errno; +#if PROFILE +short profile_buf[16384]; +extern int etext(); +#endif + +#ifdef __STDC__ +STATIC void read_profile(char *); +char *getenv(char *); +#else +STATIC void read_profile(); +char *getenv(); +#endif + + +/* + * Main routine. We initialize things, parse the arguments, execute + * profiles if we're a login shell, and then call cmdloop to execute + * commands. The setjmp call sets up the location to jump to when an + * exception occurs. When an exception occurs the variable "state" + * is used to figure out how far we had gotten. + */ + +main(argc, argv) char **argv; { + struct jmploc jmploc; + struct stackmark smark; + volatile int state; + char *shinit; + +#if PROFILE + monitor(4, etext, profile_buf, sizeof profile_buf, 50); +#endif + state = 0; + if (setjmp(jmploc.loc)) { + /* + * When a shell procedure is executed, we raise the + * exception EXSHELLPROC to clean up before executing + * the shell procedure. + */ + if (exception == EXSHELLPROC) { + rootpid = getpid(); + rootshell = 1; + minusc = NULL; + state = 3; + } else if (state == 0 || iflag == 0 || ! rootshell) + exitshell(2); + reset(); + if (exception == EXINT +#if ATTY + && (! attyset() || equal(termval(), "emacs")) +#endif + ) { + out2c('\n'); + flushout(&errout); + } + popstackmark(&smark); + FORCEINTON; /* enable interrupts */ + if (state == 1) + goto state1; + else if (state == 2) + goto state2; + else if (state == 3) + goto state3; + else + goto state4; + } + handler = &jmploc; +#ifdef DEBUG + opentrace(); + trputs("Shell args: "); trargs(argv); +#endif + rootpid = getpid(); + rootshell = 1; + init(); + setstackmark(&smark); + procargs(argc, argv); + if (argv[0] && argv[0][0] == '-') { + state = 1; + read_profile("/etc/profile"); +state1: + state = 2; + read_profile(".profile"); + } +state2: + state = 3; + if ((shinit = lookupvar("ENV")) != NULL && + *shinit != '\0') { + state = 3; + read_profile(shinit); + } +state3: + state = 4; + if (minusc) { + evalstring(minusc); + } + if (sflag || minusc == NULL) { +state4: /* XXX ??? - why isn't this before the "if" statement */ + cmdloop(1); + } +#if PROFILE + monitor(0); +#endif + exitshell(exitstatus); +} + + +/* + * Read and execute commands. "Top" is nonzero for the top level command + * loop; it turns on prompting if the shell is interactive. + */ + +void +cmdloop(top) { + union node *n; + struct stackmark smark; + int inter; + int numeof = 0; + + TRACE(("cmdloop(%d) called\n", top)); + setstackmark(&smark); + for (;;) { + if (pendingsigs) + dotrap(); + inter = 0; + if (iflag && top) { + inter++; + showjobs(1); + chkmail(0); + flushout(&output); + } + n = parsecmd(inter); + /* showtree(n); DEBUG */ + if (n == NEOF) { + if (!top || numeof >= 50) + break; + if (!stoppedjobs()) { + if (!Iflag) + break; + out2str("\nUse \"exit\" to leave shell.\n"); + } + numeof++; + } else if (n != NULL && nflag == 0) { + job_warning = (job_warning == 2) ? 1 : 0; + numeof = 0; + evaltree(n, 0); + } + popstackmark(&smark); + } + popstackmark(&smark); /* unnecessary */ +} + + + +/* + * Read /etc/profile or .profile. Return on error. + */ + +STATIC void +read_profile(name) + char *name; + { + int fd; + + INTOFF; + if ((fd = open(name, O_RDONLY)) >= 0) + setinputfd(fd, 1); + INTON; + if (fd < 0) + return; + cmdloop(0); + popfile(); +} + + + +/* + * Read a file containing shell functions. + */ + +void +readcmdfile(name) + char *name; + { + int fd; + + INTOFF; + if ((fd = open(name, O_RDONLY)) >= 0) + setinputfd(fd, 1); + else + error("Can't open %s", name); + INTON; + cmdloop(0); + popfile(); +} + + + +/* + * Take commands from a file. To be compatable we should do a path + * search for the file, but a path search doesn't make any sense. + */ + +dotcmd(argc, argv) char **argv; { + exitstatus = 0; + if (argc >= 2) { /* That's what SVR2 does */ + setinputfile(argv[1], 1); + commandname = argv[1]; + cmdloop(0); + popfile(); + } + return exitstatus; +} + + +exitcmd(argc, argv) char **argv; { + if (stoppedjobs()) + return; + if (argc > 1) + exitstatus = number(argv[1]); + exitshell(exitstatus); +} + + +#ifdef notdef +/* + * Should never be called. + */ + +void +exit(exitstatus) { + _exit(exitstatus); +} +#endif -- cgit v1.1