int
main(int argc, char *argv[])
{
struct sigaction oact;
Char *cp;
char *tcp, **tempv;
const char *ecp;
sigset_t nsigset;
int f;
cshin = stdin;
cshout = stdout;
csherr = stderr;
setprogname(argv[0]);
settimes(); /* Immed. estab. timing base */
/*
* Initialize non constant strings
*/
#ifdef _PATH_BSHELL
STR_BSHELL = SAVE(_PATH_BSHELL);
#endif
#ifdef _PATH_CSHELL
STR_SHELLPATH = SAVE(_PATH_CSHELL);
#endif
STR_environ = blk2short(environ);
environ = short2blk(STR_environ); /* So that we can free it */
STR_WORD_CHARS = SAVE(WORD_CHARS);
HIST = '!';
HISTSUB = '^';
word_chars = STR_WORD_CHARS;
tempv = argv;
if (eq(str2short(tempv[0]), STRaout)) /* A.out's are quittable */
quitit = 1;
uid = getuid();
gid = getgid();
euid = geteuid();
egid = getegid();
/*
* We are a login shell if: 1. we were invoked as -<something> and we had
* no arguments 2. or we were invoked only with the -l flag
*/
loginsh = (**tempv == '-' && argc == 1) ||
(argc == 2 && tempv[1][0] == '-' && tempv[1][1] == 'l' &&
tempv[1][2] == '\0');
if (loginsh && **tempv != '-') {
/*
* Mangle the argv space
*/
tempv[1][0] = '\0';
tempv[1][1] = '\0';
tempv[1] = NULL;
for (tcp = *tempv; *tcp++;)
continue;
for (tcp--; tcp >= *tempv; tcp--)
tcp[1] = tcp[0];
*++tcp = '-';
argc--;
}
if (loginsh)
(void)time(&chktim);
AsciiOnly = 1;
#ifdef NLS
(void)setlocale(LC_ALL, "");
{
int k;
for (k = 0200; k <= 0377 && !Isprint(k); k++)
continue;
AsciiOnly = k > 0377;
}
#else
AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL;
#endif /* NLS */
/*
* Move the descriptors to safe places. The variable didfds is 0 while we
* have only FSH* to work with. When didfds is true, we have 0,1,2 and
* prefer to use these.
*/
initdesc();
/*
* XXX: This is to keep programs that use stdio happy.
* what we really want is freunopen() ....
* Closing cshin cshout and csherr (which are really stdin stdout
* and stderr at this point and then reopening them in the same order
* gives us again stdin == cshin stdout == cshout and stderr == csherr.
* If that was not the case builtins like printf that use stdio
* would break. But in any case we could fix that with memcpy and
* a bit of pointer manipulation...
* Fortunately this is not needed under the current implementation
* of stdio.
*/
(void)fclose(cshin);
(void)fclose(cshout);
(void)fclose(csherr);
if (!(cshin = funopen2((void *) &SHIN, readf, writef, seekf, NULL,
closef)))
exit(1);
if (!(cshout = funopen2((void *) &SHOUT, readf, writef, seekf, NULL,
closef)))
exit(1);
if (!(csherr = funopen2((void *) &SHERR, readf, writef, seekf, NULL,
closef)))
exit(1);
(void)setvbuf(cshin, NULL, _IOLBF, 0);
(void)setvbuf(cshout, NULL, _IOLBF, 0);
(void)setvbuf(csherr, NULL, _IOLBF, 0);
/*
* Initialize the shell variables. ARGV and PROMPT are initialized later.
* STATUS is also munged in several places. CHILD is munged when
* forking/waiting
*/
set(STRstatus, Strsave(STR0));
if ((ecp = getenv("HOME")) != NULL)
cp = quote(SAVE(ecp));
else
cp = NULL;
if (cp == NULL)
fast = 1; /* No home -> can't read scripts */
else
set(STRhome, cp);
dinit(cp); /* dinit thinks that HOME == cwd in a login
* shell */
/*
* Grab other useful things from the environment. Should we grab
* everything??
*/
if ((ecp = getenv("LOGNAME")) != NULL ||
(ecp = getenv("USER")) != NULL)
set(STRuser, quote(SAVE(ecp)));
if ((ecp = getenv("TERM")) != NULL)
set(STRterm, quote(SAVE(ecp)));
/*
* Re-initialize path if set in environment
*/
if ((ecp = getenv("PATH")) == NULL) {
#ifdef _PATH_DEFPATH
importpath(str2short(_PATH_DEFPATH));
#else
setq(STRpath, defaultpath(), &shvhed);
#endif
} else {
importpath(str2short(ecp));
}
set(STRshell, Strsave(STR_SHELLPATH));
doldol = putn((int) getpid()); /* For $$ */
shtemp = Strspl(STRtmpsh, doldol); /* For << */
/*
* Record the interrupt states from the parent process. If the parent is
* non-interruptible our hand must be forced or we (and our children) won't
* be either. Our children inherit termination from our parent. We catch it
* only if we are the login shell.
*/
/* parents interruptibility */
(void)sigaction(SIGINT, NULL, &oact);
parintr = oact.sa_handler;
(void)sigaction(SIGTERM, NULL, &oact);
parterm = oact.sa_handler;
/* catch these all, login shell or not */
(void)signal(SIGHUP, phup); /* exit processing on HUP */
(void)signal(SIGXCPU, phup); /* ...and on XCPU */
(void)signal(SIGXFSZ, phup); /* ...and on XFSZ */
/*
* Process the arguments.
*
* Note that processing of -v/-x is actually delayed till after script
* processing.
*
* We set the first character of our name to be '-' if we are a shell
* running interruptible commands. Many programs which examine ps'es
* use this to filter such shells out.
*/
argc--, tempv++;
while (argc > 0 && (tcp = tempv[0])[0] == '-' && *++tcp != '\0' && !batch) {
do
switch (*tcp++) {
case 0: /* - Interruptible, no prompt */
prompt = 0;
setintr = 1;
nofile = 1;
break;
case 'b': /* -b Next arg is input file */
batch = 1;
break;
case 'c': /* -c Command input from arg */
if (argc == 1)
xexit(0);
argc--, tempv++;
arginp = SAVE(tempv[0]);
prompt = 0;
nofile = 1;
break;
case 'e': /* -e Exit on any error */
exiterr = 1;
break;
case 'f': /* -f Fast start */
fast = 1;
break;
case 'i': /* -i Interactive, even if !intty */
intact = 1;
nofile = 1;
break;
case 'm': /* -m read .cshrc (from su) */
mflag = 1;
break;
case 'n': /* -n Don't execute */
noexec = 1;
break;
case 'q': /* -q (Undoc'd) ... die on quit */
quitit = 1;
break;
case 's': /* -s Read from std input */
nofile = 1;
break;
case 't': /* -t Read one line from input */
onelflg = 2;
prompt = 0;
nofile = 1;
break;
case 'v': /* -v Echo hist expanded input */
nverbose = 1; /* ... later */
break;
case 'x': /* -x Echo just before execution */
nexececho = 1; /* ... later */
break;
case 'V': /* -V Echo hist expanded input */
setNS(STRverbose); /* NOW! */
break;
case 'X': /* -X Echo just before execution */
setNS(STRecho); /* NOW! */
break;
} while (*tcp);
tempv++, argc--;
}
if (quitit) /* With all due haste, for debugging */
(void)signal(SIGQUIT, SIG_DFL);
/*
* Unless prevented by -, -c, -i, -s, or -t, if there are remaining
* arguments the first of them is the name of a shell file from which to
* read commands.
*/
if (nofile == 0 && argc > 0) {
nofile = open(tempv[0], O_RDONLY);
if (nofile < 0) {
child = 1; /* So this doesn't return */
stderror(ERR_SYSTEM, tempv[0], strerror(errno));
}
ffile = SAVE(tempv[0]);
/*
* Replace FSHIN. Handle /dev/std{in,out,err} specially
* since once they are closed we cannot open them again.
* In that case we use our own saved descriptors
*/
if ((SHIN = dmove(nofile, FSHIN)) < 0)
switch(nofile) {
case 0:
SHIN = FSHIN;
break;
case 1:
SHIN = FSHOUT;
break;
case 2:
SHIN = FSHERR;
break;
default:
stderror(ERR_SYSTEM, tempv[0], strerror(errno));
/* NOTREACHED */
}
(void)ioctl(SHIN, FIOCLEX, NULL);
prompt = 0;
/* argc not used any more */ tempv++;
}
intty = isatty(SHIN);
intty |= intact;
if (intty || (intact && isatty(SHOUT))) {
if (!batch && (uid != euid || gid != egid)) {
errno = EACCES;
child = 1; /* So this doesn't return */
stderror(ERR_SYSTEM, "csh", strerror(errno));
}
}
/*
* Decide whether we should play with signals or not. If we are explicitly
* told (via -i, or -) or we are a login shell (arg0 starts with -) or the
* input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx")
* Note that in only the login shell is it likely that parent may have set
* signals to be ignored
*/
if (loginsh || intact || (intty && isatty(SHOUT)))
setintr = 1;
settell();
/*
* Save the remaining arguments in argv.
*/
setq(STRargv, blk2short(tempv), &shvhed);
/*
* Set up the prompt.
*/
if (prompt) {
set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymcent));
/* that's a meta-questionmark */
set(STRprompt2, Strsave(STRmquestion));
}
/*
* If we are an interactive shell, then start fiddling with the signals;
* this is a tricky game.
*/
shpgrp = getpgrp();
opgrp = tpgrp = -1;
if (setintr) {
**argv = '-';
if (!quitit) /* Wary! */
(void)signal(SIGQUIT, SIG_IGN);
(void)signal(SIGINT, pintr);
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGINT);
(void)sigprocmask(SIG_BLOCK, &nsigset, NULL);
(void)signal(SIGTERM, SIG_IGN);
if (quitit == 0 && arginp == 0) {
(void)signal(SIGTSTP, SIG_IGN);
(void)signal(SIGTTIN, SIG_IGN);
(void)signal(SIGTTOU, SIG_IGN);
/*
* Wait till in foreground, in case someone stupidly runs csh &
* dont want to try to grab away the tty.
*/
if (isatty(FSHERR))
f = FSHERR;
else if (isatty(FSHOUT))
f = FSHOUT;
else if (isatty(OLDSTD))
f = OLDSTD;
else
f = -1;
retry:
if ((tpgrp = tcgetpgrp(f)) != -1) {
if (tpgrp != shpgrp) {
sig_t old = signal(SIGTTIN, SIG_DFL);
(void)kill(0, SIGTTIN);
(void)signal(SIGTTIN, old);
goto retry;
}
opgrp = shpgrp;
shpgrp = getpid();
tpgrp = shpgrp;
/*
* Setpgid will fail if we are a session leader and
* mypid == mypgrp (POSIX 4.3.3)
*/
if (opgrp != shpgrp)
if (setpgid(0, shpgrp) == -1)
goto notty;
/*
* We do that after we set our process group, to make sure
* that the process group belongs to a process in the same
* session as the tty (our process and our group) (POSIX 7.2.4)
*/
if (tcsetpgrp(f, shpgrp) == -1)
goto notty;
(void)ioctl(dcopy(f, FSHTTY), FIOCLEX, NULL);
}
if (tpgrp == -1) {
notty:
(void)fprintf(csherr, "Warning: no access to tty (%s).\n",
strerror(errno));
(void)fprintf(csherr, "Thus no job control in this shell.\n");
}
}
}
if ((setintr == 0) && (parintr == SIG_DFL))
setintr = 1;
(void)signal(SIGCHLD, pchild); /* while signals not ready */
/*
* Set an exit here in case of an interrupt or error reading the shell
* start-up scripts.
*/
reenter = setexit(); /* PWP */
haderr = 0; /* In case second time through */
if (!fast && reenter == 0) {
/* Will have value(STRhome) here because set fast if don't */
{
sig_t oparintr;
sigset_t osigset;
int osetintr;
oparintr = parintr;
osetintr = setintr;
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGINT);
(void)sigprocmask(SIG_BLOCK, &nsigset, &osigset);
setintr = 0;
parintr = SIG_IGN; /* Disable onintr */
#ifdef _PATH_DOTCSHRC
(void)srcfile(_PATH_DOTCSHRC, 0, 0);
#endif
if (!fast && !arginp && !onelflg)
dohash(NULL, NULL);
#ifdef _PATH_DOTLOGIN
if (loginsh)
(void)srcfile(_PATH_DOTLOGIN, 0, 0);
#endif
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
setintr = osetintr;
parintr = oparintr;
}
(void)srccat(value(STRhome), STRsldotcshrc);
if (!fast && !arginp && !onelflg && !havhash)
dohash(NULL, NULL);
/*
* Source history before .login so that it is available in .login
*/
if ((cp = value(STRhistfile)) != STRNULL)
tildehist[2] = cp;
dosource(tildehist, NULL);
if (loginsh)
(void)srccat(value(STRhome), STRsldotlogin);
}
/*
* Now are ready for the -v and -x flags
*/
if (nverbose)
setNS(STRverbose);
if (nexececho)
setNS(STRecho);
/*
* All the rest of the world is inside this call. The argument to process
* indicates whether it should catch "error unwinds". Thus if we are a
* interactive shell our call here will never return by being blown past on
* an error.
*/
process(setintr);
/*
* Mop-up.
*/
if (intty) {
if (loginsh) {
(void)fprintf(cshout, "logout\n");
(void)close(SHIN);
child = 1;
goodbye();
}
else {
(void)fprintf(cshout, "exit\n");
}
}
rechist();
exitstat();
/* NOTREACHED */
}
int fork(void) {
size_t rc;
size_t stacksize;
char modname[512];/*FIXBUF*/
HANDLE hProc,hThread, hArray[2];
STARTUPINFO si;
PROCESS_INFORMATION pi;
SECURITY_ATTRIBUTES sa;
DWORD dwCreationflags;
unsigned int priority;
HANDLE h64Parent,h64Child;
#ifndef _M_ALPHA
unsigned long fork_stack_end;
#endif _M_ALPHA
__fork_stack_begin =GETSTACKBASE();
#ifndef _M_ALPHA
__fork_stack_end = &fork_stack_end;
#else
__fork_stack_end = (unsigned long *)__asm("mov $sp, $0");
#endif /*_M_ALPHA*/
h64Parent = h64Child = NULL;
//
// Create two inheritable events
//
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor =0;
sa.bInheritHandle = TRUE;
if (!__hforkchild)
__hforkchild = CreateEvent(&sa,TRUE,FALSE,NULL);
if (!__hforkparent)
__hforkparent = CreateEvent(&sa,TRUE,FALSE,NULL);
rc = setjmp(__fork_context);
if (rc) { // child
#ifdef _M_IX86
//
// Restore old registration
// -amol 2/2/97
GETEXCEPTIONREGIST() = (struct _EXCEPTION_REGISTRATION_RECORD*)_old_exr;
#endif // _M_ALPHA
SetEvent(__hforkchild);
dprintf("Child ready to rumble\n");
if(WaitForSingleObject(__hforkparent,FORK_TIMEOUT) != WAIT_OBJECT_0)
ExitProcess(0xFFFF);
CloseHandle(__hforkchild);
CloseHandle(__hforkparent);
__hforkchild = __hforkparent=0;
//__asm { int 3};
restore_fds();
STR_environ = blk2short(environ);
environ = short2blk(STR_environ); /* So that we can free it */
return 0;
}
copy_fds();
memset(&si,0,sizeof(si));
si.cb= sizeof(si);
/*
* This f!@#!@% function returns the old value even if the std handles
* have been closed.
* Skip this step, since we know tcsh will do the right thing later.
*
si.hStdInput= GetStdHandle(STD_INPUT_HANDLE);
si.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
*/
if (!GetModuleFileName(GetModuleHandle(NULL),modname,512) ) {
rc = GetLastError();
return -1;
}
dwCreationflags = GetPriorityClass(GetCurrentProcess());
priority = GetThreadPriority(GetCurrentThread());
rc = CreateProcess(NULL,
modname,
NULL,
NULL,
TRUE,
CREATE_SUSPENDED | dwCreationflags,
NULL,
NULL,
&si,
&pi);
if (!rc) {
rc = GetLastError();
return -1;
}
ResetEvent(__hforkchild);
ResetEvent(__hforkparent);
hProc = pi.hProcess;
hThread = pi.hThread;
__forked=1;
/*
* Usage of events in the wow64 case:
*
* h64Parent : initially non-signalled
* h64Child : initially non-signalled
*
* 1. Create the events, resume the child thread.
* 2. Child opens h64Parent to see if it is a child process in wow64
* 3. Child opens and sets h64Child to tell parent it's running. (This
* step is needed because we can't copy to a process created in the
* suspended state on wow64.)
* 4. Copy gForkData and then set h64Parent. This tells the child
* that the parameters in the structure are trustworthy.
* 5. Wait for h64Child so that we know the child has created the stack
* in dynamic memory.
*
* The rest of the fork hack should now proceed as in x86
*
*/
if (bIsWow64Process) {
// allocate the heap for the child. this can be done even when
// the child is suspended.
// avoids inexplicable allocation failures in the child.
if (VirtualAllocEx(hProc,
__heap_base,
__heap_size,
MEM_RESERVE,
PAGE_READWRITE) == NULL) {
dprintf("virtual allocex failed %d\n",GetLastError());
goto error;
}
if (VirtualAllocEx(hProc,
__heap_base,
__heap_size,
MEM_COMMIT,
PAGE_READWRITE) == NULL) {
dprintf("virtual allocex2 failed %d\n",GetLastError());
goto error;
}
// Do NOT expect existing events
if (!CreateWow64Events(pi.dwProcessId,&h64Parent,&h64Child,FALSE)) {
goto error;
}
ResumeThread(hThread);
// wait for the child to tell us it is running
//if (WaitForSingleObject(h64Child,FORK_TIMEOUT) != WAIT_OBJECT_0) {
// rc = GetLastError();
// goto error;
//}
hArray[0] = h64Child;
hArray[1] = hProc;
if (WaitForMultipleObjects(2,hArray,FALSE,FORK_TIMEOUT) !=
WAIT_OBJECT_0){
rc = GetLastError();
goto error;
}
}
//
// Copy all the shared data
//
if (!WriteProcessMemory(hProc,&gForkData,&gForkData,
sizeof(ForkData),&rc)) {
goto error;
}
if (rc != sizeof(ForkData))
goto error;
if (!bIsWow64Process) {
rc = ResumeThread(hThread);
}
// in the wow64 case, the child will be waiting on h64parent again.
// set it, and then wait for h64child. This will mean the child has
// a stack set up at the right location.
else {
SetEvent(h64Parent);
hArray[0] = h64Child;
hArray[1] = hProc;
if (WaitForMultipleObjects(2,hArray,FALSE,FORK_TIMEOUT) !=
WAIT_OBJECT_0){
rc = GetLastError();
goto error;
}
CloseHandle(h64Parent);
CloseHandle(h64Child);
h64Parent = h64Child = NULL;
}
//
// Wait for the child to start and init itself.
// The timeout is so that we don't wait too long
//
hArray[0] = __hforkchild;
hArray[1] = hProc;
if (WaitForMultipleObjects(2,hArray,FALSE,FORK_TIMEOUT) != WAIT_OBJECT_0){
int err = GetLastError(); // For debugging purposes
dprintf("wait failed err %d\n",err);
goto error;
}
// Stop the child again and copy the stack and heap
//
SuspendThread(hThread);
if (!SetThreadPriority(hThread,priority) ) {
priority =GetLastError();
}
// stack
stacksize = (char*)__fork_stack_begin - (char*)__fork_stack_end;
if (!WriteProcessMemory(hProc,(char *)__fork_stack_end,
(char *)__fork_stack_end,
(u_long)stacksize,
&rc)){
goto error;
}
//
// copy heap itself
if (!WriteProcessMemory(hProc, (void*)__heap_base,(void*)__heap_base,
(DWORD)((char*)__heap_top-(char*)__heap_base),
&rc)){
goto error;
}
rc = fork_copy_user_mem(hProc);
if(rc) {
goto error;
}
// Release the child.
SetEvent(__hforkparent);
rc = ResumeThread(hThread);
__forked=0;
dprintf("forked process %d\n",pi.dwProcessId);
start_sigchild_thread(hProc,pi.dwProcessId);
close_copied_fds();
CloseHandle(hThread);
//
// return process id to parent.
return pi.dwProcessId;
error:
__forked=0;
SetEvent(__hforkparent);
ResumeThread(hThread);
CloseHandle(hProc);
CloseHandle(hThread);
if (h64Parent) {
SetEvent(h64Parent); // don't let child block forever
CloseHandle(h64Parent);
}
if (h64Child)
CloseHandle(h64Child);
return -1;
}
