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Cygwin: pty: Fix select() with pseudo console support.

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- select() did not work correctly when both read and except are
  polled simultaneously for the same fd and the r/w pipe is switched
  to pseudo console side. This patch fixes this isseu.
This commit is contained in:
Takashi Yano
2019-09-05 13:22:54 +09:00
committed by Corinna Vinschen
parent 433c6b8e0a
commit 915fcd0ae8
4 changed files with 207 additions and 15 deletions
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13
winsup/cygwin/fhandler_tty.cc
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@@ -1223,6 +1223,13 @@ fhandler_pty_slave::write (const void *ptr, size_t len)
return towrite;
}
bool
fhandler_pty_common::to_be_read_from_pcon (void)
{
return get_ttyp ()->switch_to_pcon &&
(!get_ttyp ()->mask_switch_to_pcon || ALWAYS_USE_PCON);
}
void __reg3
fhandler_pty_slave::read (void *ptr, size_t& len)
{
@@ -1351,8 +1358,7 @@ fhandler_pty_slave::read (void *ptr, size_t& len)
}
goto out;
}
if (get_ttyp ()->switch_to_pcon &&
(!get_ttyp ()->mask_switch_to_pcon || ALWAYS_USE_PCON))
if (to_be_read_from_pcon ())
{
if (!try_reattach_pcon ())
{
@@ -2129,8 +2135,7 @@ fhandler_pty_master::write (const void *ptr, size_t len)
/* Write terminal input to to_slave pipe instead of output_handle
if current application is native console application. */
if (get_ttyp ()->switch_to_pcon &&
(!get_ttyp ()->mask_switch_to_pcon || ALWAYS_USE_PCON))
if (to_be_read_from_pcon ())
{
char *buf;
size_t nlen;