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Cygwin: FIFO: avoid hang after exec 

Define fhandler:fifo::fixup_after_exec, which sets listen_client_thr
and lct_termination_evt to NULL.  This forces the listen_client thread
to restart on the first attempt to read after an exec.  Previously the
exec'd process could hang in fhandler_fifo::raw_read.
This commit is contained in:
Ken Brown 2019-04-18 15:39:52 +00:00 committed by Corinna Vinschen
parent f811485ffb
commit 230c5df2df
2 changed files with 10 additions and 0 deletions
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1
winsup/cygwin/fhandler.h
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@ -1301,6 +1301,7 @@ public:
ssize_t __reg3 raw_write (const void *ptr, size_t ulen); ssize_t __reg3 raw_write (const void *ptr, size_t ulen);
bool arm (HANDLE h); bool arm (HANDLE h);
void fixup_after_fork (HANDLE); void fixup_after_fork (HANDLE);
void fixup_after_exec ();
int __reg2 fstatvfs (struct statvfs *buf); int __reg2 fstatvfs (struct statvfs *buf);
void clear_readahead () void clear_readahead ()
{ {

9
winsup/cygwin/fhandler_fifo.cc
View File

@ -942,6 +942,15 @@ fhandler_fifo::fixup_after_fork (HANDLE parent)
fifo_client_unlock (); fifo_client_unlock ();
} }
void
fhandler_fifo::fixup_after_exec ()
{
fhandler_base::fixup_after_exec ();
listen_client_thr = NULL;
lct_termination_evt = NULL;
fifo_client_unlock ();
}
void void
fhandler_fifo::set_close_on_exec (bool val) fhandler_fifo::set_close_on_exec (bool val)
{ {