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* [newlib-cygwin] Cygwin: pty: Add several further comments to the pty code.
@ 2022-03-05 0:06 Takashi Yano
0 siblings, 0 replies; only message in thread
From: Takashi Yano @ 2022-03-05 0:06 UTC (permalink / raw)
To: cygwin-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=6c622490a5004b06b8d714c7fbb73b2caa4fee7a
commit 6c622490a5004b06b8d714c7fbb73b2caa4fee7a
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date: Sat Mar 5 08:39:05 2022 +0900
Cygwin: pty: Add several further comments to the pty code.
Diff:
---
winsup/cygwin/fhandler_tty.cc | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index 0c762d75e..c2e612580 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -76,6 +76,13 @@ void release_attach_mutex (void)
inline static bool process_alive (DWORD pid);
+/* This functions looks for a process which attached to the same console
+ with current process and is matched to given conditions:
+ match: If true, return given pid if the process pid attaches to the
+ same console, otherwise, return 0. If false, return pid except
+ for given pid.
+ cygwin: return only process's pid which has cygwin pid.
+ stub_only: return only stub process's pid of non-cygwin process. */
DWORD
fhandler_pty_common::get_console_process_id (DWORD pid, bool match,
bool cygwin, bool stub_only)
@@ -158,6 +165,7 @@ set_switch_to_nat_pipe (HANDLE *in, HANDLE *out, HANDLE *err)
*err = replace_err->get_output_handle_nat ();
}
+/* Determine if the given path is cygwin binary. */
static bool
path_iscygexec_a_w (LPCSTR na, LPSTR ca, LPCWSTR nw, LPWSTR cw)
{
@@ -3860,6 +3868,7 @@ fhandler_pty_slave::transfer_input (tty::xfer_dir dir, HANDLE from, tty *ttyp,
if (dir == tty::to_cyg && ttyp->pcon_activated)
{ /* from handle is console handle */
+ /* Reaches here for nat->cyg case with pcon activated. */
INPUT_RECORD r[INREC_SIZE];
DWORD n;
while (PeekConsoleInputA (from, r, INREC_SIZE, &n) && n)
@@ -3931,7 +3940,8 @@ fhandler_pty_slave::transfer_input (tty::xfer_dir dir, HANDLE from, tty *ttyp,
}
}
else
- {
+ { /* Reaches here when both cyg->nat and nat->cyg cases with
+ pcon not activated or cyg->nat case with pcon activated. */
DWORD bytes_in_pipe;
while (::bytes_available (bytes_in_pipe, from) && bytes_in_pipe)
{
@@ -3964,9 +3974,11 @@ fhandler_pty_slave::transfer_input (tty::xfer_dir dir, HANDLE from, tty *ttyp,
}
}
- if (dir == tty::to_nat)
+ /* Fix input_available_event which indicates availability in cyg pipe. */
+ if (dir == tty::to_nat) /* all data is transfered to nat pipe,
+ so no data available in cyg pipe. */
ResetEvent (input_available_event);
- else if (transfered)
+ else if (transfered) /* There is data transfered to cyg pipe. */
SetEvent (input_available_event);
ttyp->pty_input_state = dir;
ttyp->discard_input = false;
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2022-03-05 0:06 [newlib-cygwin] Cygwin: pty: Add several further comments to the pty code Takashi Yano
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