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Fix hang stracing forking processes but not following child

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* ntdll.h (PROCESSINFOCLASS): Define ProcessDebugFlags.
        * sigproc.cc (child_info::child_info): Only propagate _CI_STRACED to
        child if strace is actually tracing child processes.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2015-08-24 18:37:53 +02:00
parent 986069c7e3
commit dbc1cae5c5
4 changed files with 37 additions and 2 deletions
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16
winsup/cygwin/sigproc.cc
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@@ -772,7 +772,21 @@ child_info::child_info (unsigned in_cb, child_info_types chtype,
fhandler_union_cb = sizeof (fhandler_union);
user_h = cygwin_user_h;
if (strace.active ())
flag |= _CI_STRACED;
{
NTSTATUS status;
ULONG DebugFlags;
/* Only propagate _CI_STRACED to child if strace is actually tracing
child processes of this process. The undocumented ProcessDebugFlags
returns 0 if EPROCESS->NoDebugInherit is TRUE, 1 otherwise.
This avoids a hang when stracing a forking or spawning process
with the -f flag set to "don't follow fork". */
status = NtQueryInformationProcess (GetCurrentProcess (),
ProcessDebugFlags, &DebugFlags,
sizeof (DebugFlags), NULL);
if (NT_SUCCESS (status) && DebugFlags)
flag |= _CI_STRACED;
}
if (need_subproc_ready)
{
subproc_ready = CreateEvent (&sec_all, FALSE, FALSE, NULL);