blob: b421e4f3a7a472c5a280ba80fb8850d8b6c5b272 [file] [log] [blame]
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1997-2005
* Herbert Xu <herbert@gondor.apana.org.au>. 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. 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.
*/
#include <stdio.h>
#include <signal.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include "shell.h"
#include "main.h"
#include "mail.h"
#include "options.h"
#include "output.h"
#include "parser.h"
#include "nodes.h"
#include "expand.h"
#include "eval.h"
#include "jobs.h"
#include "input.h"
#include "trap.h"
#include "var.h"
#include "show.h"
#include "memalloc.h"
#include "error.h"
#include "init.h"
#include "mystring.h"
#include "exec.h"
#include "cd.h"
#ifdef HETIO
#include "hetio.h"
#endif
#define PROFILE 0
int rootpid;
int shlvl;
#ifdef __GLIBC__
int *dash_errno;
#endif
#if PROFILE
short profile_buf[16384];
extern int etext();
#endif
STATIC void read_profile(const char *);
STATIC char *find_dot_file(char *);
static int cmdloop(int);
int main(int, char **);
/*
* 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.
*/
int
main(int argc, char **argv)
{
char *shinit;
volatile int state;
struct jmploc jmploc;
struct stackmark smark;
#ifdef __GLIBC__
dash_errno = __errno_location();
#endif
#if PROFILE
monitor(4, etext, profile_buf, sizeof profile_buf, 50);
#endif
state = 0;
if (unlikely(setjmp(jmploc.loc))) {
int e;
int s;
reset();
e = exception;
if (e == EXERROR)
exitstatus = 2;
s = state;
if (e == EXEXIT || s == 0 || iflag == 0 || shlvl)
exitshell();
if (e == EXINT
#if ATTY
&& (! attyset() || equal(termval(), "emacs"))
#endif
) {
out2c('\n');
#ifdef FLUSHERR
flushout(out2);
#endif
}
popstackmark(&smark);
FORCEINTON; /* enable interrupts */
if (s == 1)
goto state1;
else if (s == 2)
goto state2;
else if (s == 3)
goto state3;
else
goto state4;
}
handler = &jmploc;
#ifdef DEBUG
opentrace();
trputs("Shell args: "); trargs(argv);
#endif
rootpid = getpid();
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 (
#ifndef linux
getuid() == geteuid() && getgid() == getegid() &&
#endif
iflag
) {
if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
read_profile(shinit);
}
}
state3:
state = 4;
if (minusc)
evalstring(minusc, 0);
if (sflag || minusc == NULL) {
state4: /* XXX ??? - why isn't this before the "if" statement */
cmdloop(1);
}
#if PROFILE
monitor(0);
#endif
#if GPROF
{
extern void _mcleanup(void);
_mcleanup();
}
#endif
exitshell();
/* NOTREACHED */
}
/*
* Read and execute commands. "Top" is nonzero for the top level command
* loop; it turns on prompting if the shell is interactive.
*/
static int
cmdloop(int top)
{
union node *n;
struct stackmark smark;
int inter;
int numeof = 0;
TRACE(("cmdloop(%d) called\n", top));
#ifdef HETIO
if(iflag && top)
hetio_init();
#endif
for (;;) {
int skip;
setstackmark(&smark);
if (jobctl)
showjobs(out2, SHOW_CHANGED);
inter = 0;
if (iflag && top) {
inter++;
chkmail();
}
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 (nflag == 0) {
job_warning = (job_warning == 2) ? 1 : 0;
numeof = 0;
evaltree(n, 0);
}
popstackmark(&smark);
skip = evalskip;
if (skip) {
evalskip = 0;
return skip & SKIPEVAL;
}
}
return 0;
}
/*
* Read /etc/profile or .profile. Return on error.
*/
STATIC void
read_profile(const char *name)
{
int skip;
if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
return;
skip = cmdloop(0);
popfile();
if (skip)
exitshell();
}
/*
* Read a file containing shell functions.
*/
void
readcmdfile(char *name)
{
setinputfile(name, INPUT_PUSH_FILE);
cmdloop(0);
popfile();
}
/*
* Take commands from a file. To be compatible we should do a path
* search for the file, which is necessary to find sub-commands.
*/
STATIC char *
find_dot_file(char *basename)
{
char *fullname;
const char *path = pathval();
struct stat statb;
/* don't try this for absolute or relative paths */
if (strchr(basename, '/'))
return basename;
while ((fullname = padvance(&path, basename)) != NULL) {
if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
/*
* Don't bother freeing here, since it will
* be freed by the caller.
*/
return fullname;
}
stunalloc(fullname);
}
/* not found in the PATH */
sh_error("%s: not found", basename);
/* NOTREACHED */
}
int
dotcmd(int argc, char **argv)
{
int status = 0;
if (argc >= 2) { /* That's what SVR2 does */
char *fullname;
fullname = find_dot_file(argv[1]);
setinputfile(fullname, INPUT_PUSH_FILE);
commandname = fullname;
cmdloop(0);
popfile();
status = exitstatus;
}
return status;
}
int
exitcmd(int argc, char **argv)
{
if (stoppedjobs())
return 0;
if (argc > 1)
exitstatus = number(argv[1]);
exraise(EXEXIT);
/* NOTREACHED */
}