Is this normal? [ please cc: me directly]
~> ps -W | fgrep /a
506 1 345 430 3 11054 13:49:15 /h/a
506 1 345 430 3 11054 13:49:15 /h/a
506 1 345 430 3 11054 13:49:15 /h/a
506 1 345 430 3 11054 13:49:15 /h/a
506 1 345 430 3 11054 13:49:15 /h/a
506 1 345 430 3 11054 13:49:15 /h/a
506 1 345 430 3 11054 13:49:15 /h/a
506 1 345 430 3 11054 13:49:15 /h/a
506 1 345 430 3 11054 13:49:15 /h/a
506 1 345 430 3 11054 13:49:15 /h/a
506 1 345 430 3 11054 13:49:15 /h/a
[Incidentally the WINPIDs are reported incorrectly, but that's
a side issue ]
The previous situation happens when a process with ppid == 1
execs itself repeatedly (see demo code below). All the old
processes stay around.
I have looked at spawn.cc and "how-spawn-works". I understand that
the old process wants to stay around when the child isn't
a Cygwin process.
Spawn.cc
int nwait = 3;
HANDLE waitbuf[3] = {pi.hProcess, signal_arrived, spr};
for (int i = 0; i < 100; i++)
{
switch (WaitForMultipleObjects (nwait, waitbuf, FALSE, INFINITE))
{
case WAIT_OBJECT_0:
sigproc_printf ("subprocess exited");
DWORD exitcode;
if (!GetExitCodeProcess (pi.hProcess, &exitcode))
exitcode = 1;
res |= exitcode;
exited = TRUE;
break;
case WAIT_OBJECT_0 + 1:
sigproc_printf ("signal arrived");
reset_signal_arrived ();
continue;
case WAIT_OBJECT_0 + 2:
if (myself->ppid_handle)
res |= EXIT_REPARENTING;
if (!my_parent_is_alive ())
{
nwait = 2;
sigproc_terminate ();
continue;
}
When a Cygwin process is launched there should be an event on
spr, leading to case WAIT_OBJECT_0 + 2:
Even though the child is Cygwin, if myself->ppid_handle == NULL
(all) the parent(s) continue and stay(s) around until the final
descendant exits. What's the a reason for this behavior?
Pierre
**************************************************************
#include <unistd.h>
#include <stdio.h>
main (int argc, char * argv[])
{
char count[10];
int i;
if (getppid() != 1)
if (fork() != 0) exit(0); /* parent exits */
/* Now execs 10 times */
if (argc == 1) i = 0;
else i = atoi(argv[1]);
sprintf(count, "%d", i+1);
if (i < 10)
execl(argv[0], argv[0], count, 0);
sleep(180);
}
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