1290 lines
35 KiB
C++
1290 lines
35 KiB
C++
/* sigproc.cc: inter/intra signal and sub process handler
|
|
|
|
Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Red Hat, Inc.
|
|
|
|
Written by Christopher Faylor
|
|
|
|
This file is part of Cygwin.
|
|
|
|
This software is a copyrighted work licensed under the terms of the
|
|
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
|
|
details. */
|
|
|
|
#include "winsup.h"
|
|
#include <stdlib.h>
|
|
#include <time.h>
|
|
#include <sys/wait.h>
|
|
#include <stdlib.h>
|
|
#include <sys/cygwin.h>
|
|
#include <assert.h>
|
|
#include <sys/signal.h>
|
|
#include "cygerrno.h"
|
|
#include "sync.h"
|
|
#include "pinfo.h"
|
|
#include "security.h"
|
|
#include "path.h"
|
|
#include "fhandler.h"
|
|
#include "dtable.h"
|
|
#include "cygheap.h"
|
|
#include "child_info_magic.h"
|
|
#include "shared_info.h"
|
|
#include "cygthread.h"
|
|
#include "cygtls.h"
|
|
#include "sigproc.h"
|
|
#include "perthread.h"
|
|
#include "exceptions.h"
|
|
|
|
/*
|
|
* Convenience defines
|
|
*/
|
|
#define WSSC 60000 // Wait for signal completion
|
|
#define WPSP 40000 // Wait for proc_subproc mutex
|
|
|
|
#define PSIZE 63 // Number of processes
|
|
|
|
#define wake_wait_subproc() SetEvent (events[0])
|
|
|
|
#define no_signals_available() (!hwait_sig || (myself->sendsig == INVALID_HANDLE_VALUE) || exit_state)
|
|
|
|
#define NZOMBIES 256
|
|
|
|
class pending_signals
|
|
{
|
|
sigpacket sigs[NSIG + 1];
|
|
sigpacket start;
|
|
sigpacket *end;
|
|
sigpacket *prev;
|
|
sigpacket *curr;
|
|
int empty;
|
|
public:
|
|
void reset () {curr = &start; prev = &start;}
|
|
void add (sigpacket&);
|
|
void del ();
|
|
sigpacket *next ();
|
|
sigpacket *save () const {return curr;}
|
|
void restore (sigpacket *saved) {curr = saved;}
|
|
friend int __stdcall sig_dispatch_pending ();
|
|
};
|
|
|
|
static pending_signals sigqueue;
|
|
|
|
struct sigaction *global_sigs;
|
|
|
|
void __stdcall
|
|
sigalloc ()
|
|
{
|
|
cygheap->sigs = global_sigs =
|
|
(struct sigaction *) ccalloc (HEAP_SIGS, NSIG, sizeof (struct sigaction));
|
|
}
|
|
|
|
void __stdcall
|
|
signal_fixup_after_exec ()
|
|
{
|
|
global_sigs = cygheap->sigs;
|
|
/* Set up child's signal handlers */
|
|
for (int i = 0; i < NSIG; i++)
|
|
{
|
|
global_sigs[i].sa_mask = 0;
|
|
if (global_sigs[i].sa_handler != SIG_IGN)
|
|
global_sigs[i].sa_handler = SIG_DFL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Global variables
|
|
*/
|
|
const char *__sp_fn ;
|
|
int __sp_ln;
|
|
|
|
char NO_COPY myself_nowait_dummy[1] = {'0'};// Flag to sig_send that signal goes to
|
|
// current process but no wait is required
|
|
HANDLE NO_COPY signal_arrived; // Event signaled when a signal has
|
|
// resulted in a user-specified
|
|
// function call
|
|
/*
|
|
* Common variables
|
|
*/
|
|
|
|
|
|
/* How long to wait for message/signals. Normally this is infinite.
|
|
* On termination, however, these are set to zero as a flag to exit.
|
|
*/
|
|
|
|
#define Static static NO_COPY
|
|
|
|
Static DWORD proc_loop_wait = 1000; // Wait for subprocesses to exit
|
|
|
|
Static HANDLE sigcomplete_main; // Event signaled when a signal has
|
|
// finished processing for the main
|
|
// thread
|
|
HANDLE NO_COPY sigCONT; // Used to "STOP" a process
|
|
Static cygthread *hwait_sig; // Handle of wait_sig thread
|
|
Static cygthread *hwait_subproc; // Handle of sig_subproc thread
|
|
|
|
Static HANDLE wait_sig_inited; // Control synchronization of
|
|
// message queue startup
|
|
|
|
/* Used by WaitForMultipleObjects. These are handles to child processes.
|
|
*/
|
|
Static HANDLE events[PSIZE + 1]; // All my children's handles++
|
|
#define hchildren (events + 1) // Where the children handles begin
|
|
Static char cpchildren[PSIZE * sizeof (pinfo)]; // All my children info
|
|
Static int nchildren; // Number of active children
|
|
Static char czombies[(NZOMBIES + 1) * sizeof (pinfo)]; // All my deceased children info
|
|
Static int nzombies; // Number of deceased children
|
|
|
|
#define pchildren ((pinfo *) cpchildren)
|
|
#define zombies ((pinfo *) czombies)
|
|
|
|
Static waitq waitq_head = {0, 0, 0, 0, 0, 0, 0};// Start of queue for wait'ing threads
|
|
Static waitq waitq_main; // Storage for main thread
|
|
|
|
muto NO_COPY *sync_proc_subproc = NULL; // Control access to subproc stuff
|
|
|
|
DWORD NO_COPY sigtid = 0; // ID of the signal thread
|
|
|
|
/* Functions
|
|
*/
|
|
static int __stdcall checkstate (waitq *) __attribute__ ((regparm (1)));
|
|
static __inline__ bool get_proc_lock (DWORD, DWORD);
|
|
static void __stdcall remove_zombie (int);
|
|
static DWORD WINAPI wait_sig (VOID *arg);
|
|
static int __stdcall stopped_or_terminated (waitq *, _pinfo *);
|
|
static DWORD WINAPI wait_subproc (VOID *);
|
|
|
|
/* Determine if the parent process is alive.
|
|
*/
|
|
|
|
bool __stdcall
|
|
my_parent_is_alive ()
|
|
{
|
|
bool res;
|
|
if (!myself->ppid_handle)
|
|
{
|
|
debug_printf ("No myself->ppid_handle");
|
|
res = false;
|
|
}
|
|
else
|
|
for (int i = 0; i < 2; i++)
|
|
switch (res = WaitForSingleObject (myself->ppid_handle, 0))
|
|
{
|
|
case WAIT_OBJECT_0:
|
|
debug_printf ("parent dead.");
|
|
res = false;
|
|
goto out;
|
|
case WAIT_TIMEOUT:
|
|
debug_printf ("parent still alive");
|
|
res = true;
|
|
goto out;
|
|
case WAIT_FAILED:
|
|
DWORD werr = GetLastError ();
|
|
if (werr == ERROR_INVALID_HANDLE && i == 0)
|
|
continue;
|
|
system_printf ("WFSO for myself->ppid_handle(%p) failed, error %d",
|
|
myself->ppid_handle, werr);
|
|
res = false;
|
|
goto out;
|
|
}
|
|
out:
|
|
return res;
|
|
}
|
|
|
|
void __stdcall
|
|
wait_for_sigthread ()
|
|
{
|
|
sigproc_printf ("wait_sig_inited %p", wait_sig_inited);
|
|
HANDLE hsig_inited = wait_sig_inited;
|
|
(void) WaitForSingleObject (hsig_inited, INFINITE);
|
|
wait_sig_inited = NULL;
|
|
(void) ForceCloseHandle1 (hsig_inited, wait_sig_inited);
|
|
}
|
|
|
|
/* Get the sync_proc_subproc muto to control access to
|
|
* children, zombie arrays.
|
|
* Attempt to handle case where process is exiting as we try to grab
|
|
* the mutex.
|
|
*/
|
|
static bool
|
|
get_proc_lock (DWORD what, DWORD val)
|
|
{
|
|
Static int lastwhat = -1;
|
|
if (!sync_proc_subproc)
|
|
{
|
|
sigproc_printf ("sync_proc_subproc is NULL (1)");
|
|
return false;
|
|
}
|
|
if (sync_proc_subproc->acquire (WPSP))
|
|
{
|
|
lastwhat = what;
|
|
return true;
|
|
}
|
|
if (!sync_proc_subproc)
|
|
{
|
|
sigproc_printf ("sync_proc_subproc is NULL (2)");
|
|
return false;
|
|
}
|
|
system_printf ("Couldn't aquire sync_proc_subproc for(%d,%d), %E, last %d",
|
|
what, val, lastwhat);
|
|
return true;
|
|
}
|
|
|
|
static bool __stdcall
|
|
proc_can_be_signalled (_pinfo *p)
|
|
{
|
|
if (p->sendsig == INVALID_HANDLE_VALUE)
|
|
{
|
|
set_errno (EPERM);
|
|
return false;
|
|
}
|
|
|
|
if (p == myself_nowait || p == myself)
|
|
return hwait_sig;
|
|
|
|
if (ISSTATE (p, PID_INITIALIZING) ||
|
|
(((p)->process_state & (PID_ACTIVE | PID_IN_USE)) ==
|
|
(PID_ACTIVE | PID_IN_USE)))
|
|
return true;
|
|
|
|
set_errno (ESRCH);
|
|
return false;
|
|
}
|
|
|
|
bool __stdcall
|
|
pid_exists (pid_t pid)
|
|
{
|
|
pinfo p (pid);
|
|
return proc_exists (p);
|
|
}
|
|
|
|
/* Test to determine if a process really exists and is processing signals.
|
|
*/
|
|
bool __stdcall
|
|
proc_exists (_pinfo *p)
|
|
{
|
|
return p && !(p->process_state & (PID_EXITED | PID_ZOMBIE));
|
|
}
|
|
|
|
/* Return 1 if this is one of our children, zero otherwise.
|
|
FIXME: This really should be integrated with the rest of the proc_subproc
|
|
testing. Scanning these lists twice is inefficient. */
|
|
int __stdcall
|
|
mychild (int pid)
|
|
{
|
|
for (int i = 0; i < nchildren; i++)
|
|
if (pchildren[i]->pid == pid)
|
|
return 1;
|
|
for (int i = 0; i < nzombies; i++)
|
|
if (zombies[i]->pid == pid)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/* Handle all subprocess requests
|
|
*/
|
|
#define vchild (*((pinfo *) val))
|
|
int __stdcall
|
|
proc_subproc (DWORD what, DWORD val)
|
|
{
|
|
int rc = 1;
|
|
int potential_match;
|
|
_pinfo *child;
|
|
int clearing;
|
|
waitq *w;
|
|
int thiszombie;
|
|
|
|
#define wval ((waitq *) val)
|
|
|
|
sigproc_printf ("args: %x, %d", what, val);
|
|
|
|
if (!get_proc_lock (what, val)) // Serialize access to this function
|
|
{
|
|
system_printf ("couldn't get proc lock. what %d, val %d", what, val);
|
|
goto out1;
|
|
}
|
|
|
|
switch (what)
|
|
{
|
|
/* Add a new subprocess to the children arrays.
|
|
* (usually called from the main thread)
|
|
*/
|
|
case PROC_ADDCHILD:
|
|
if (nchildren >= PSIZE - 1)
|
|
{
|
|
rc = 0;
|
|
break;
|
|
}
|
|
pchildren[nchildren] = vchild;
|
|
hchildren[nchildren] = vchild->hProcess;
|
|
if (!DuplicateHandle (hMainProc, vchild->hProcess, hMainProc, &vchild->pid_handle,
|
|
0, 0, DUPLICATE_SAME_ACCESS))
|
|
system_printf ("Couldn't duplicate child handle for pid %d, %E", vchild->pid);
|
|
ProtectHandle1 (vchild->pid_handle, pid_handle);
|
|
|
|
if (!DuplicateHandle (hMainProc, hMainProc, vchild->hProcess, &vchild->ppid_handle,
|
|
SYNCHRONIZE | PROCESS_DUP_HANDLE, TRUE, 0))
|
|
system_printf ("Couldn't duplicate my handle<%p> for pid %d, %E", hMainProc, vchild->pid);
|
|
vchild->ppid = myself->pid;
|
|
vchild->uid = myself->uid;
|
|
vchild->gid = myself->gid;
|
|
vchild->pgid = myself->pgid;
|
|
vchild->sid = myself->sid;
|
|
vchild->ctty = myself->ctty;
|
|
vchild->process_state |= PID_INITIALIZING | (myself->process_state & PID_USETTY);
|
|
|
|
sigproc_printf ("added pid %d to wait list, slot %d, winpid %p, handle %p",
|
|
vchild->pid, nchildren, vchild->dwProcessId,
|
|
vchild->hProcess);
|
|
nchildren++;
|
|
|
|
wake_wait_subproc ();
|
|
break;
|
|
|
|
/* A child process had terminated.
|
|
Possibly this is just due to an exec(). Cygwin implements an exec()
|
|
as a "handoff" from one windows process to another. If child->hProcess
|
|
is different from what is recorded in hchildren, then this is an exec().
|
|
Otherwise this is a normal child termination event.
|
|
(called from wait_subproc thread) */
|
|
case PROC_CHILDTERMINATED:
|
|
if (hchildren[val] != pchildren[val]->hProcess)
|
|
{
|
|
sigproc_printf ("pid %d[%d], reparented old hProcess %p, new %p",
|
|
pchildren[val]->pid, val, hchildren[val], pchildren[val]->hProcess);
|
|
HANDLE h = hchildren[val];
|
|
hchildren[val] = pchildren[val]->hProcess; /* Filled out by child */
|
|
sync_proc_subproc->release (); // Release the lock ASAP
|
|
ForceCloseHandle1 (h, childhProc);
|
|
ProtectHandle1 (pchildren[val]->hProcess, childhProc);
|
|
rc = 0;
|
|
goto out; // This was an exec()
|
|
}
|
|
|
|
sigproc_printf ("pid %d[%d] terminated, handle %p, nchildren %d, nzombies %d",
|
|
pchildren[val]->pid, val, hchildren[val], nchildren, nzombies);
|
|
|
|
thiszombie = nzombies;
|
|
zombies[nzombies] = pchildren[val]; // Add to zombie array
|
|
zombies[nzombies++]->process_state = PID_ZOMBIE;// Walking dead
|
|
|
|
sigproc_printf ("zombifying [%d], pid %d, handle %p, nchildren %d",
|
|
val, pchildren[val]->pid, hchildren[val], nchildren);
|
|
if ((int) val < --nchildren)
|
|
{
|
|
hchildren[val] = hchildren[nchildren];
|
|
pchildren[val] = pchildren[nchildren];
|
|
}
|
|
|
|
/* See if we should care about the this terminated process. If we've
|
|
filled up our table or if we're ignoring SIGCHLD, then we immediately
|
|
remove the process and move on. Otherwise, this process becomes a zombie
|
|
which must be reaped by a wait() call. FIXME: This is a very inelegant
|
|
way to deal with this and could lead to process hangs. */
|
|
if (nzombies >= NZOMBIES)
|
|
{
|
|
sigproc_printf ("zombie table overflow %d", thiszombie);
|
|
remove_zombie (thiszombie);
|
|
}
|
|
|
|
/* Don't scan the wait queue yet. Caller will send SIGCHLD to this process.
|
|
This will cause an eventual scan of waiters. */
|
|
break;
|
|
|
|
/* Handle a wait4() operation. Allocates an event for the calling
|
|
* thread which is signaled when the appropriate pid exits or stops.
|
|
* (usually called from the main thread)
|
|
*/
|
|
case PROC_WAIT:
|
|
wval->ev = NULL; // Don't know event flag yet
|
|
|
|
if (wval->pid <= 0)
|
|
child = NULL; // Not looking for a specific pid
|
|
else if (!mychild (wval->pid))
|
|
goto out; // invalid pid. flag no such child
|
|
|
|
wval->status = 0; // Don't know status yet
|
|
sigproc_printf ("wval->pid %d, wval->options %d", wval->pid, wval->options);
|
|
|
|
/* If the first time for this thread, create a new event, otherwise
|
|
* reset the event.
|
|
*/
|
|
if ((wval->ev = wval->thread_ev) == NULL)
|
|
{
|
|
wval->ev = wval->thread_ev = CreateEvent (&sec_none_nih, TRUE,
|
|
FALSE, NULL);
|
|
ProtectHandle (wval->ev);
|
|
}
|
|
|
|
ResetEvent (wval->ev);
|
|
w = waitq_head.next;
|
|
waitq_head.next = wval; /* Add at the beginning. */
|
|
wval->next = w; /* Link in rest of the list. */
|
|
clearing = 0;
|
|
goto scan_wait;
|
|
|
|
/* Clear all waiting threads. Called from exceptions.cc prior to
|
|
the main thread's dispatch to a signal handler function.
|
|
(called from wait_sig thread) */
|
|
case PROC_CLEARWAIT:
|
|
/* Clear all "wait"ing threads. */
|
|
if (val)
|
|
sigproc_printf ("clear waiting threads");
|
|
else
|
|
sigproc_printf ("looking for processes to reap");
|
|
clearing = val;
|
|
|
|
scan_wait:
|
|
/* Scan the linked list of wait()ing threads. If a wait's parameters
|
|
* match this pid, then activate it.
|
|
*/
|
|
for (w = &waitq_head; w->next != NULL; w = w->next)
|
|
{
|
|
if ((potential_match = checkstate (w)) > 0)
|
|
sigproc_printf ("released waiting thread");
|
|
else if (!clearing && !(w->next->options & WNOHANG) && potential_match < 0)
|
|
sigproc_printf ("only found non-terminated children");
|
|
else if (potential_match <= 0) // nothing matched
|
|
{
|
|
sigproc_printf ("waiting thread found no children");
|
|
HANDLE oldw = w->next->ev;
|
|
w->next->pid = 0;
|
|
if (clearing)
|
|
w->next->status = -1; /* flag that a signal was received */
|
|
else if (!potential_match || !(w->next->options & WNOHANG))
|
|
w->next->ev = NULL;
|
|
if (!SetEvent (oldw))
|
|
system_printf ("couldn't wake up wait event %p, %E", oldw);
|
|
w->next = w->next->next;
|
|
}
|
|
if (w->next == NULL)
|
|
break;
|
|
}
|
|
|
|
if (!clearing)
|
|
sigproc_printf ("finished processing terminated/stopped child");
|
|
else
|
|
{
|
|
waitq_head.next = NULL;
|
|
sigproc_printf ("finished clearing");
|
|
}
|
|
|
|
if (global_sigs[SIGCHLD].sa_handler == (void *) SIG_IGN)
|
|
while (nzombies)
|
|
remove_zombie (0);
|
|
break;
|
|
}
|
|
|
|
out:
|
|
sync_proc_subproc->release (); // Release the lock
|
|
out1:
|
|
sigproc_printf ("returning %d", rc);
|
|
return rc;
|
|
}
|
|
|
|
/* Terminate the wait_subproc thread.
|
|
* Called on process exit.
|
|
* Also called by spawn_guts to disassociate any subprocesses from this
|
|
* process. Subprocesses will then know to clean up after themselves and
|
|
* will not become zombies.
|
|
*/
|
|
void __stdcall
|
|
proc_terminate (void)
|
|
{
|
|
sigproc_printf ("nchildren %d, nzombies %d", nchildren, nzombies);
|
|
/* Signal processing is assumed to be blocked in this routine. */
|
|
if (hwait_subproc)
|
|
{
|
|
proc_loop_wait = 0; // Tell wait_subproc thread to exit
|
|
sync_proc_subproc->acquire (WPSP);
|
|
wake_wait_subproc (); // Wake wait_subproc loop
|
|
hwait_subproc = NULL;
|
|
|
|
(void) proc_subproc (PROC_CLEARWAIT, 1);
|
|
|
|
/* Clean out zombie processes from the pid list. */
|
|
int i;
|
|
for (i = 0; i < nzombies; i++)
|
|
{
|
|
if (zombies[i]->hProcess)
|
|
{
|
|
ForceCloseHandle1 (zombies[i]->hProcess, childhProc);
|
|
ForceCloseHandle1 (zombies[i]->pid_handle, pid_handle);
|
|
}
|
|
zombies[i]->ppid = 1;
|
|
zombies[i]->process_state = PID_EXITED; /* CGF FIXME - still needed? */
|
|
zombies[i].release (); // FIXME: this breaks older gccs for some reason
|
|
}
|
|
|
|
/* Disassociate my subprocesses */
|
|
for (i = 0; i < nchildren; i++)
|
|
{
|
|
if (!pchildren[i]->hProcess)
|
|
sigproc_printf ("%d(%d) hProcess cleared already?", pchildren[i]->pid,
|
|
pchildren[i]->dwProcessId);
|
|
else
|
|
{
|
|
ForceCloseHandle1 (pchildren[i]->hProcess, childhProc);
|
|
sigproc_printf ("%d(%d) closed child handle", pchildren[i]->pid,
|
|
pchildren[i]->dwProcessId);
|
|
pchildren[i]->ppid = 1;
|
|
if (pchildren[i]->pgid == myself->pid)
|
|
pchildren[i]->process_state |= PID_ORPHANED;
|
|
}
|
|
pchildren[i].release ();
|
|
}
|
|
nchildren = nzombies = 0;
|
|
sync_proc_subproc = NULL;
|
|
}
|
|
sigproc_printf ("leaving");
|
|
}
|
|
|
|
/* Clear pending signal */
|
|
void __stdcall
|
|
sig_clear (int target_sig)
|
|
{
|
|
if (GetCurrentThreadId () != sigtid)
|
|
sig_send (myself, -target_sig);
|
|
else
|
|
{
|
|
sigpacket *q;
|
|
sigpacket *save = sigqueue.save ();
|
|
sigqueue.reset ();
|
|
while ((q = sigqueue.next ()))
|
|
if (q->si.si_signo == target_sig)
|
|
{
|
|
q->si.si_signo = __SIGDELETE;
|
|
break;
|
|
}
|
|
sigqueue.restore (save);
|
|
}
|
|
return;
|
|
}
|
|
|
|
extern "C" int
|
|
sigpending (sigset_t *mask)
|
|
{
|
|
sigset_t outset = (sigset_t) sig_send (myself, __SIGPENDING);
|
|
if (outset == SIG_BAD_MASK)
|
|
return -1;
|
|
*mask = outset;
|
|
return 0;
|
|
}
|
|
|
|
/* Force the wait_sig thread to wake up and scan for pending signals */
|
|
int __stdcall
|
|
sig_dispatch_pending ()
|
|
{
|
|
if (exit_state || GetCurrentThreadId () == sigtid || !sigqueue.start.next)
|
|
{
|
|
#ifdef DEBUGGING
|
|
sigproc_printf ("exit_state %d, GetCurrentThreadId () %p, sigtid %p, sigqueue.start.next %p",
|
|
exit_state, GetCurrentThreadId (), sigtid, sigqueue.start.next);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
#ifdef DEBUGGING
|
|
sigproc_printf ("flushing");
|
|
#endif
|
|
(void) sig_send (myself, __SIGFLUSH);
|
|
return call_signal_handler_now ();
|
|
}
|
|
|
|
/* Message initialization. Called from dll_crt0_1
|
|
*
|
|
* This routine starts the signal handling thread. The wait_sig_inited
|
|
* event is used to signal that the thread is ready to handle signals.
|
|
* We don't wait for this during initialization but instead detect it
|
|
* in sig_send to gain a little concurrency.
|
|
*/
|
|
void __stdcall
|
|
sigproc_init ()
|
|
{
|
|
wait_sig_inited = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
|
|
ProtectHandle (wait_sig_inited);
|
|
|
|
/* sync_proc_subproc is used by proc_subproc. It serialises
|
|
* access to the children and zombie arrays.
|
|
*/
|
|
new_muto (sync_proc_subproc);
|
|
|
|
/* local event signaled when main thread has been dispatched
|
|
to a signal handler function. */
|
|
signal_arrived = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
|
|
ProtectHandle (signal_arrived);
|
|
|
|
hwait_sig = new cygthread (wait_sig, cygself, "sig");
|
|
hwait_sig->zap_h ();
|
|
|
|
/* Initialize waitq structure for main thread. A waitq structure is
|
|
* allocated for each thread that executes a wait to allow multiple threads
|
|
* to perform waits. Pre-allocate a waitq structure for the main thread.
|
|
*/
|
|
waitq *w;
|
|
if ((w = (waitq *)waitq_storage.get ()) == NULL)
|
|
{
|
|
w = &waitq_main;
|
|
waitq_storage.set (w);
|
|
}
|
|
memset (w, 0, sizeof *w); // Just to be safe
|
|
|
|
global_sigs[SIGSTOP].sa_flags = SA_RESTART | SA_NODEFER;
|
|
sigproc_printf ("process/signal handling enabled(%x)", myself->process_state);
|
|
return;
|
|
}
|
|
|
|
/* Called on process termination to terminate signal and process threads.
|
|
*/
|
|
void __stdcall
|
|
sigproc_terminate (void)
|
|
{
|
|
extern HANDLE hExeced;
|
|
hwait_sig = NULL;
|
|
|
|
if (myself->sendsig == INVALID_HANDLE_VALUE)
|
|
sigproc_printf ("sigproc handling not active");
|
|
else
|
|
{
|
|
sigproc_printf ("entering");
|
|
// finished with anything it is doing
|
|
ForceCloseHandle (sigcomplete_main);
|
|
if (!hExeced)
|
|
{
|
|
HANDLE sendsig = myself->sendsig;
|
|
myself->sendsig = INVALID_HANDLE_VALUE;
|
|
CloseHandle (sendsig);
|
|
}
|
|
}
|
|
proc_terminate (); // Terminate process handling thread
|
|
|
|
return;
|
|
}
|
|
|
|
int __stdcall
|
|
sig_send (_pinfo *p, int sig)
|
|
{
|
|
siginfo_t si;
|
|
si.si_signo = sig;
|
|
si.si_code = SI_KERNEL;
|
|
si.si_pid = si.si_uid = si.si_errno = 0;
|
|
return sig_send (p, si);
|
|
}
|
|
|
|
/* Send a signal to another process by raising its signal semaphore.
|
|
If pinfo *p == NULL, send to the current process.
|
|
If sending to this process, wait for notification that a signal has
|
|
completed before returning. */
|
|
int __stdcall
|
|
sig_send (_pinfo *p, siginfo_t& si, _threadinfo *tls)
|
|
{
|
|
int rc = 1;
|
|
bool its_me;
|
|
HANDLE sendsig;
|
|
sigpacket pack;
|
|
|
|
bool wait_for_completion;
|
|
// FIXMENOW: Avoid using main thread's completion event!
|
|
if (!(its_me = (p == NULL || p == myself || p == myself_nowait)))
|
|
wait_for_completion = false;
|
|
else
|
|
{
|
|
if (no_signals_available ())
|
|
{
|
|
sigproc_printf ("hwait_sig %p, myself->sendsig %p, exit_state %d",
|
|
hwait_sig, myself->sendsig, exit_state);
|
|
goto out; // Either exiting or not yet initializing
|
|
}
|
|
if (wait_sig_inited)
|
|
wait_for_sigthread ();
|
|
wait_for_completion = p != myself_nowait && _my_tls.isinitialized ();
|
|
p = myself;
|
|
}
|
|
|
|
/* It is possible that the process is not yet ready to receive messages
|
|
* or that it has exited. Detect this.
|
|
*/
|
|
if (!proc_can_be_signalled (p)) /* Is the process accepting messages? */
|
|
{
|
|
sigproc_printf ("invalid pid %d(%x), signal %d",
|
|
p->pid, p->process_state, si.si_signo);
|
|
goto out;
|
|
}
|
|
|
|
if (its_me)
|
|
{
|
|
sendsig = myself->sendsig;
|
|
if (wait_for_completion)
|
|
pack.wakeup = sigcomplete_main;
|
|
}
|
|
else
|
|
{
|
|
HANDLE hp = OpenProcess (PROCESS_DUP_HANDLE, false, p->dwProcessId);
|
|
if (!hp)
|
|
{
|
|
sigproc_printf ("OpenProcess failed, %E");
|
|
__seterrno ();
|
|
goto out;
|
|
}
|
|
for (int i = 0; !p->sendsig && i < 10000; i++)
|
|
low_priority_sleep (0);
|
|
if (!DuplicateHandle (hp, p->sendsig, hMainProc, &sendsig, false, 0,
|
|
DUPLICATE_SAME_ACCESS) || !sendsig)
|
|
{
|
|
sigproc_printf ("DuplicateHandle failed, %E");
|
|
__seterrno ();
|
|
goto out;
|
|
}
|
|
CloseHandle (hp);
|
|
pack.wakeup = NULL;
|
|
}
|
|
|
|
sigproc_printf ("sendsig %p, pid %d, signal %d, its_me %d", sendsig, p->pid, si.si_signo, its_me);
|
|
|
|
sigset_t pending;
|
|
if (!its_me)
|
|
pack.mask = NULL;
|
|
else if (si.si_signo == __SIGPENDING)
|
|
pack.mask = &pending;
|
|
else if (si.si_signo == __SIGFLUSH || si.si_signo > 0)
|
|
pack.mask = &myself->getsigmask ();
|
|
else
|
|
pack.mask = NULL;
|
|
|
|
pack.si = si;
|
|
if (!pack.si.si_pid)
|
|
pack.si.si_pid = myself->pid;
|
|
if (!pack.si.si_uid)
|
|
pack.si.si_uid = myself->uid;
|
|
pack.pid = myself->pid;
|
|
pack.tls = (_threadinfo *) tls;
|
|
pack.mask_storage = 0;
|
|
DWORD nb;
|
|
if (!WriteFile (sendsig, &pack, sizeof (pack), &nb, NULL) || nb != sizeof (pack))
|
|
{
|
|
/* Couldn't send to the pipe. This probably means that the
|
|
process is exiting. */
|
|
if (!its_me)
|
|
{
|
|
sigproc_printf ("WriteFile for pipe %p failed, %E", sendsig);
|
|
__seterrno ();
|
|
ForceCloseHandle (sendsig);
|
|
}
|
|
else
|
|
{
|
|
if (no_signals_available ())
|
|
sigproc_printf ("I'm going away now");
|
|
else
|
|
system_printf ("error sending signal %d to pid %d, pipe handle %p, %E",
|
|
si.si_signo, p->pid, sendsig);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
|
|
/* No need to wait for signal completion unless this was a signal to
|
|
this process.
|
|
|
|
If it was a signal to this process, wait for a dispatched signal.
|
|
Otherwise just wait for the wait_sig to signal that it has finished
|
|
processing the signal. */
|
|
if (wait_for_completion)
|
|
{
|
|
sigproc_printf ("Waiting for pack.wakeup %p", pack.wakeup);
|
|
rc = WaitForSingleObject (pack.wakeup, WSSC);
|
|
}
|
|
else
|
|
{
|
|
rc = WAIT_OBJECT_0;
|
|
sigproc_printf ("Not waiting for sigcomplete. its_me %d signal %d",
|
|
its_me, si.si_signo);
|
|
if (!its_me)
|
|
ForceCloseHandle (sendsig);
|
|
}
|
|
|
|
if (rc == WAIT_OBJECT_0)
|
|
rc = 0; // Successful exit
|
|
else
|
|
{
|
|
if (!no_signals_available ())
|
|
system_printf ("wait for sig_complete event failed, signal %d, rc %d, %E",
|
|
si.si_signo, rc);
|
|
set_errno (ENOSYS);
|
|
rc = -1;
|
|
}
|
|
|
|
if (wait_for_completion)
|
|
call_signal_handler_now ();
|
|
|
|
out:
|
|
if (si.si_signo != __SIGPENDING)
|
|
/* nothing */;
|
|
else if (!rc)
|
|
rc = (int) pending;
|
|
else
|
|
rc = SIG_BAD_MASK;
|
|
sigproc_printf ("returning %p from sending signal %d", rc, si.si_signo);
|
|
return rc;
|
|
}
|
|
|
|
/* Initialize the wait_subproc thread.
|
|
* Called from fork() or spawn() to initialize the handling of subprocesses.
|
|
*/
|
|
void __stdcall
|
|
subproc_init (void)
|
|
{
|
|
if (hwait_subproc)
|
|
return;
|
|
|
|
/* A "wakeup" handle which can be toggled to make wait_subproc reexamine
|
|
* the hchildren array.
|
|
*/
|
|
events[0] = CreateEvent (&sec_none_nih, FALSE, FALSE, NULL);
|
|
hwait_subproc = new cygthread (wait_subproc, NULL, "proc");
|
|
hwait_subproc->zap_h ();
|
|
ProtectHandle (events[0]);
|
|
sigproc_printf ("started wait_subproc thread");
|
|
}
|
|
|
|
/* Initialize some of the memory block passed to child processes
|
|
by fork/spawn/exec. */
|
|
|
|
void __stdcall
|
|
init_child_info (DWORD chtype, child_info *ch, pid_t pid, HANDLE subproc_ready)
|
|
{
|
|
memset (ch, 0, sizeof *ch);
|
|
ch->cb = chtype == PROC_FORK ? sizeof (child_info_fork) : sizeof (child_info);
|
|
ch->intro = PROC_MAGIC_GENERIC;
|
|
ch->magic = CHILD_INFO_MAGIC;
|
|
ch->type = chtype;
|
|
ch->cygpid = pid;
|
|
ch->subproc_ready = subproc_ready;
|
|
ch->pppid_handle = myself->ppid_handle;
|
|
ch->fhandler_union_cb = sizeof (fhandler_union);
|
|
ch->user_h = cygwin_user_h;
|
|
}
|
|
|
|
/* Check the state of all of our children to see if any are stopped or
|
|
* terminated.
|
|
*/
|
|
static int __stdcall
|
|
checkstate (waitq *parent_w)
|
|
{
|
|
int potential_match = 0;
|
|
|
|
sigproc_printf ("nchildren %d, nzombies %d", nchildren, nzombies);
|
|
|
|
/* Check already dead processes first to see if they match the criteria
|
|
* given in w->next.
|
|
*/
|
|
for (int i = 0; i < nzombies; i++)
|
|
switch (stopped_or_terminated (parent_w, zombies[i]))
|
|
{
|
|
case -1:
|
|
potential_match = -1;
|
|
break;
|
|
case 1:
|
|
remove_zombie (i);
|
|
potential_match = 1;
|
|
goto out;
|
|
}
|
|
|
|
sigproc_printf ("checking alive children");
|
|
|
|
/* No dead terminated children matched. Check for stopped children. */
|
|
for (int i = 0; i < nchildren; i++)
|
|
switch (stopped_or_terminated (parent_w, pchildren[i]))
|
|
{
|
|
case -1:
|
|
potential_match = -1;
|
|
break;
|
|
case 1:
|
|
potential_match = 1;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
sigproc_printf ("returning %d", potential_match);
|
|
return potential_match;
|
|
}
|
|
|
|
/* Remove a zombie from zombies by swapping it with the last child in the list.
|
|
*/
|
|
static void __stdcall
|
|
remove_zombie (int ci)
|
|
{
|
|
sigproc_printf ("removing %d, pid %d, nzombies %d", ci, zombies[ci]->pid,
|
|
nzombies);
|
|
|
|
if (zombies[ci])
|
|
{
|
|
ForceCloseHandle1 (zombies[ci]->hProcess, childhProc);
|
|
ForceCloseHandle1 (zombies[ci]->pid_handle, pid_handle);
|
|
zombies[ci].release ();
|
|
}
|
|
|
|
if (ci < --nzombies)
|
|
zombies[ci] = zombies[nzombies];
|
|
|
|
return;
|
|
}
|
|
|
|
/* Check status of child process vs. waitq member.
|
|
*
|
|
* parent_w is the pointer to the parent of the waitq member in question.
|
|
* child is the subprocess being considered.
|
|
*
|
|
* Returns
|
|
* 1 if stopped or terminated child matches parent_w->next criteria
|
|
* -1 if a non-stopped/terminated child matches parent_w->next criteria
|
|
* 0 if child does not match parent_w->next criteria
|
|
*/
|
|
static int __stdcall
|
|
stopped_or_terminated (waitq *parent_w, _pinfo *child)
|
|
{
|
|
int potential_match;
|
|
waitq *w = parent_w->next;
|
|
|
|
sigproc_printf ("considering pid %d", child->pid);
|
|
if (w->pid == -1)
|
|
potential_match = 1;
|
|
else if (w->pid == 0)
|
|
potential_match = child->pgid == myself->pgid;
|
|
else if (w->pid < 0)
|
|
potential_match = child->pgid == -w->pid;
|
|
else
|
|
potential_match = (w->pid == child->pid);
|
|
|
|
if (!potential_match)
|
|
return 0;
|
|
|
|
bool terminated;
|
|
|
|
if ((terminated = child->process_state == PID_ZOMBIE) ||
|
|
((w->options & WUNTRACED) && child->stopsig))
|
|
{
|
|
parent_w->next = w->next; /* successful wait. remove from wait queue */
|
|
w->pid = child->pid;
|
|
|
|
if (!terminated)
|
|
{
|
|
sigproc_printf ("stopped child");
|
|
w->status = (child->stopsig << 8) | 0x7f;
|
|
child->stopsig = 0;
|
|
}
|
|
else /* Should only get here when child has been moved to the zombies array */
|
|
{
|
|
DWORD status;
|
|
if (!GetExitCodeProcess (child->hProcess, &status))
|
|
status = 0xffff;
|
|
if (status & EXIT_SIGNAL)
|
|
w->status = (status >> 8) & 0xff; /* exited due to signal */
|
|
else
|
|
w->status = (status & 0xff) << 8; /* exited via "exit ()" */
|
|
|
|
add_rusage (&myself->rusage_children, &child->rusage_children);
|
|
add_rusage (&myself->rusage_children, &child->rusage_self);
|
|
|
|
if (w->rusage)
|
|
{
|
|
add_rusage ((struct rusage *) w->rusage, &child->rusage_children);
|
|
add_rusage ((struct rusage *) w->rusage, &child->rusage_self);
|
|
}
|
|
}
|
|
|
|
if (!SetEvent (w->ev)) /* wake up wait4 () immediately */
|
|
system_printf ("couldn't wake up wait event %p, %E", w->ev);
|
|
return 1;
|
|
}
|
|
|
|
return -potential_match;
|
|
}
|
|
|
|
static void
|
|
talktome ()
|
|
{
|
|
winpids pids ((DWORD) PID_MAP_RW);
|
|
for (unsigned i = 0; i < pids.npids; i++)
|
|
if (pids[i]->hello_pid == myself->pid)
|
|
if (!IsBadWritePtr (pids[i], sizeof (_pinfo)))
|
|
pids[i]->commune_recv ();
|
|
}
|
|
|
|
/* Process signals by waiting for a semaphore to become signaled.
|
|
Then scan an in-memory array representing queued signals.
|
|
Executes in a separate thread.
|
|
|
|
Signals sent from this process are sent a completion signal so
|
|
that returns from kill/raise do not occur until the signal has
|
|
has been handled, as per POSIX. */
|
|
|
|
void
|
|
pending_signals::add (sigpacket& pack)
|
|
{
|
|
sigpacket *se;
|
|
for (se = start.next; se; se = se->next)
|
|
if (se->si.si_signo == pack.si.si_signo)
|
|
return;
|
|
while (sigs[empty].si.si_signo)
|
|
if (++empty == NSIG)
|
|
empty = 0;
|
|
se = sigs + empty;
|
|
*se = pack;
|
|
se->mask_storage = *(pack.mask);
|
|
se->mask = &se->mask_storage;
|
|
se->next = NULL;
|
|
if (end)
|
|
end->next = se;
|
|
end = se;
|
|
if (!start.next)
|
|
start.next = se;
|
|
empty++;
|
|
}
|
|
|
|
void
|
|
pending_signals::del ()
|
|
{
|
|
sigpacket *next = curr->next;
|
|
prev->next = next;
|
|
curr->si.si_signo = 0;
|
|
#ifdef DEBUGGING
|
|
curr->next = NULL;
|
|
#endif
|
|
if (end == curr)
|
|
end = prev;
|
|
empty = curr - sigs;
|
|
curr = next;
|
|
}
|
|
|
|
sigpacket *
|
|
pending_signals::next ()
|
|
{
|
|
sigpacket *res;
|
|
prev = curr;
|
|
if (!curr || !(curr = curr->next))
|
|
res = NULL;
|
|
else
|
|
res = curr;
|
|
return res;
|
|
}
|
|
|
|
/* Process signals by waiting for signal data to arrive in a pipe.
|
|
Set a completion event if one was specified. */
|
|
static DWORD WINAPI
|
|
wait_sig (VOID *self)
|
|
{
|
|
HANDLE readsig;
|
|
char sa_buf[1024];
|
|
|
|
/* Initialization */
|
|
(void) SetThreadPriority (GetCurrentThread (), WAIT_SIG_PRIORITY);
|
|
|
|
/* sigcomplete_main - event used to signal main thread on signal
|
|
completion */
|
|
if (!CreatePipe (&readsig, &myself->sendsig, sec_user_nih (sa_buf), 0))
|
|
api_fatal ("couldn't create signal pipe, %E");
|
|
sigcomplete_main = CreateEvent (&sec_none_nih, FALSE, FALSE, NULL);
|
|
sigproc_printf ("sigcomplete_main %p", sigcomplete_main);
|
|
sigCONT = CreateEvent (&sec_none_nih, FALSE, FALSE, NULL);
|
|
|
|
/* Setting dwProcessId flags that this process is now capable of receiving
|
|
signals. Prior to this, dwProcessId was set to the windows pid of
|
|
of the original windows process which spawned us unless this was a
|
|
"toplevel" process. */
|
|
myself->dwProcessId = GetCurrentProcessId ();
|
|
myself->process_state |= PID_ACTIVE;
|
|
myself->process_state &= ~PID_INITIALIZING;
|
|
|
|
ProtectHandle (sigcomplete_main);
|
|
|
|
/* If we've been execed, then there is still a stub left in the previous
|
|
windows process waiting to see if it's started a cygwin process or not.
|
|
Signalling subproc_ready indicates that we are a cygwin process. */
|
|
if (child_proc_info && child_proc_info->type == PROC_EXEC)
|
|
{
|
|
debug_printf ("subproc_ready %p", child_proc_info->subproc_ready);
|
|
if (!SetEvent (child_proc_info->subproc_ready))
|
|
system_printf ("SetEvent (subproc_ready) failed, %E");
|
|
ForceCloseHandle1 (child_proc_info->subproc_ready, subproc_ready);
|
|
/* Initialize an "indirect" pid block so that if someone looks up this
|
|
process via its Windows PID it will be redirected to the appropriate
|
|
Cygwin PID shared memory block. */
|
|
static pinfo NO_COPY myself_identity;
|
|
myself_identity.init (cygwin_pid (myself->dwProcessId), PID_EXECED);
|
|
}
|
|
|
|
SetEvent (wait_sig_inited);
|
|
sigtid = GetCurrentThreadId ();
|
|
|
|
exception_list el;
|
|
_my_tls.init_threadlist_exceptions (&el);
|
|
debug_printf ("entering ReadFile loop, readsig %p, myself->sendsig %p",
|
|
readsig, myself->sendsig);
|
|
|
|
for (;;)
|
|
{
|
|
DWORD nb;
|
|
sigpacket pack;
|
|
if (!ReadFile (readsig, &pack, sizeof (pack), &nb, NULL))
|
|
break;
|
|
if (myself->sendsig == INVALID_HANDLE_VALUE)
|
|
break;
|
|
|
|
if (nb != sizeof (pack))
|
|
{
|
|
system_printf ("short read from signal pipe: %d != %d", nb,
|
|
sizeof (pack));
|
|
continue;
|
|
}
|
|
|
|
if (!pack.si.si_signo)
|
|
{
|
|
#ifdef DEBUGGING
|
|
system_printf ("zero signal?");
|
|
#endif
|
|
continue;
|
|
}
|
|
|
|
sigset_t dummy_mask;
|
|
if (!pack.mask)
|
|
{
|
|
dummy_mask = myself->getsigmask ();
|
|
pack.mask = &dummy_mask;
|
|
}
|
|
|
|
sigpacket *q;
|
|
switch (pack.si.si_signo)
|
|
{
|
|
case __SIGCOMMUNE:
|
|
talktome ();
|
|
break;
|
|
case __SIGSTRACE:
|
|
strace.hello ();
|
|
break;
|
|
case __SIGPENDING:
|
|
*pack.mask = 0;
|
|
unsigned bit;
|
|
sigqueue.reset ();
|
|
while ((q = sigqueue.next ()))
|
|
if (myself->getsigmask () & (bit = SIGTOMASK (q->si.si_signo)))
|
|
*pack.mask |= bit;
|
|
break;
|
|
case __SIGFLUSH:
|
|
sigqueue.reset ();
|
|
while ((q = sigqueue.next ()))
|
|
if (q->si.si_signo == __SIGDELETE || q->process () > 0)
|
|
sigqueue.del ();
|
|
break;
|
|
default:
|
|
if (pack.si.si_signo < 0)
|
|
sig_clear (-pack.si.si_signo);
|
|
else
|
|
{
|
|
int sigres = pack.process ();
|
|
if (sigres <= 0)
|
|
{
|
|
#ifdef DEBUGGING2
|
|
if (!sigres)
|
|
system_printf ("Failed to arm signal %d from pid %d", pack.sig, pack.pid);
|
|
#endif
|
|
sigqueue.add (pack); // FIXME: Shouldn't add this in !sh condition
|
|
}
|
|
if (pack.si.si_signo == SIGCHLD)
|
|
proc_subproc (PROC_CLEARWAIT, 0);
|
|
}
|
|
break;
|
|
}
|
|
if (pack.wakeup)
|
|
SetEvent (pack.wakeup);
|
|
}
|
|
|
|
sigproc_printf ("done");
|
|
ExitThread (0);
|
|
}
|
|
|
|
/* Wait for subprocesses to terminate. Executes in a separate thread. */
|
|
static DWORD WINAPI
|
|
wait_subproc (VOID *)
|
|
{
|
|
sigproc_printf ("starting");
|
|
int errloop = 0;
|
|
|
|
for (;;)
|
|
{
|
|
DWORD rc = WaitForMultipleObjects (nchildren + 1, events, FALSE,
|
|
proc_loop_wait);
|
|
if (rc == WAIT_TIMEOUT)
|
|
if (!proc_loop_wait)
|
|
break; // Exiting
|
|
else
|
|
continue;
|
|
|
|
if (rc == WAIT_FAILED)
|
|
{
|
|
if (!proc_loop_wait)
|
|
break;
|
|
|
|
/* It's ok to get an ERROR_INVALID_HANDLE since another thread may have
|
|
closed a handle in the children[] array. So, we try looping a couple
|
|
of times to stabilize. FIXME - this is not foolproof. Probably, this
|
|
thread should be responsible for closing the children. */
|
|
if (!errloop++)
|
|
proc_subproc (PROC_NOTHING, 0); // Just synchronize and continue
|
|
if (errloop < 10)
|
|
continue;
|
|
|
|
system_printf ("wait failed. nchildren %d, wait %d, %E",
|
|
nchildren, proc_loop_wait);
|
|
|
|
for (int i = 0; i <= nchildren; i++)
|
|
if ((rc = WaitForSingleObject (events[i], 0)) == WAIT_OBJECT_0 ||
|
|
rc == WAIT_TIMEOUT)
|
|
continue;
|
|
else if (i == 0)
|
|
system_printf ("nchildren %d, event[%d] %p, %E", nchildren, i, events[i]);
|
|
else
|
|
{
|
|
system_printf ("nchildren %d, event[%d] %p, pchildren[%d] %p, events[0] %p, %E",
|
|
nchildren, i, events[i], i - 1, (_pinfo *) pchildren[i - 1], events[0]);
|
|
system_printf ("pid %d, dwProcessId %u, hProcess %p, progname '%s'",
|
|
pchildren[i - 1]->pid, pchildren[i - 1]->dwProcessId,
|
|
pchildren[i - 1]->hProcess, pchildren[i - 1]->progname);
|
|
}
|
|
break;
|
|
}
|
|
|
|
errloop = 0;
|
|
rc -= WAIT_OBJECT_0;
|
|
if (rc-- != 0)
|
|
{
|
|
siginfo_t si;
|
|
si.si_signo = SIGCHLD;
|
|
si.si_code = SI_KERNEL;
|
|
si.si_pid = pchildren[rc]->pid;
|
|
si.si_uid = pchildren[rc]->uid;
|
|
si.si_errno = 0;
|
|
GetExitCodeProcess (hchildren[rc], (DWORD *) &si.si_status);
|
|
#if 0 // FIXME: This is tricky to get right
|
|
si.si_utime = pchildren[rc]->rusage_self.ru_utime;
|
|
si.si_stime = pchildren[rc].rusage_self.ru_stime;
|
|
#else
|
|
si.si_utime = 0;
|
|
si.si_stime = 0;
|
|
#endif
|
|
rc = proc_subproc (PROC_CHILDTERMINATED, rc);
|
|
if (!proc_loop_wait) // Don't bother if wait_subproc is
|
|
break; // exiting
|
|
|
|
/* Send a SIGCHLD to myself. We do this here, rather than in proc_subproc
|
|
to avoid the proc_subproc lock since the signal thread will eventually
|
|
be calling proc_subproc and could unnecessarily block. */
|
|
if (rc)
|
|
sig_send (myself_nowait, si);
|
|
}
|
|
sigproc_printf ("looping");
|
|
}
|
|
|
|
ForceCloseHandle (events[0]);
|
|
events[0] = NULL;
|
|
sigproc_printf ("done");
|
|
ExitThread (0);
|
|
}
|