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From: Takashi Yano <tyan0@sourceware.org> To: cygwin-cvs@sourceware.org Subject: [newlib-cygwin] Cygwin: pty: Add still missing acquire/release_attach_mutex. Date: Wed, 2 Mar 2022 19:53:44 +0000 (GMT) [thread overview] Message-ID: <20220302195344.6E40A3858D39@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=2b3a70d0a676e039429bc4d2a8aa352623d43dbc commit 2b3a70d0a676e039429bc4d2a8aa352623d43dbc Author: Takashi Yano <takashi.yano@nifty.ne.jp> Date: Thu Mar 3 04:06:38 2022 +0900 Cygwin: pty: Add still missing acquire/release_attach_mutex. - transfer_input() function uses console api, so it should be guarded by attach_mutex. However, in most cases, it is missing. This patch fixes the issue. Diff: --- winsup/cygwin/fhandler_tty.cc | 48 +++++++++++++++++++++++++++++++++++-------- 1 file changed, 40 insertions(+), 8 deletions(-) diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc index 433861bb4..43668975f 100644 --- a/winsup/cygwin/fhandler_tty.cc +++ b/winsup/cygwin/fhandler_tty.cc @@ -1133,8 +1133,10 @@ fhandler_pty_slave::reset_switch_to_nat_pipe (void) && get_ttyp ()->pty_input_state_eq (tty::to_nat)) { WaitForSingleObject (input_mutex, mutex_timeout); + acquire_attach_mutex (mutex_timeout); transfer_input (tty::to_cyg, get_handle_nat (), get_ttyp (), input_available_event); + release_attach_mutex (); ReleaseMutex (input_mutex); } if (get_ttyp ()->master_is_running_as_service @@ -1237,8 +1239,10 @@ fhandler_pty_slave::reset_switch_to_nat_pipe (void) && get_ttyp ()->switch_to_nat_pipe) { WaitForSingleObject (input_mutex, mutex_timeout); + acquire_attach_mutex (mutex_timeout); transfer_input (tty::to_cyg, get_handle_nat (), get_ttyp (), input_available_event); + release_attach_mutex (); ReleaseMutex (input_mutex); } } @@ -1250,8 +1254,12 @@ fhandler_pty_slave::reset_switch_to_nat_pipe (void) WaitForSingleObject (input_mutex, mutex_timeout); if (get_ttyp ()->switch_to_nat_pipe && !get_ttyp ()->pcon_activated && get_ttyp ()->pty_input_state_eq (tty::to_nat)) - transfer_input (tty::to_cyg, get_handle_nat (), get_ttyp (), - input_available_event); + { + acquire_attach_mutex (mutex_timeout); + transfer_input (tty::to_cyg, get_handle_nat (), get_ttyp (), + input_available_event); + release_attach_mutex (); + } ReleaseMutex (input_mutex); /* Clean up nat pipe state */ get_ttyp ()->pty_input_state = tty::to_cyg; @@ -1333,11 +1341,19 @@ fhandler_pty_slave::mask_switch_to_nat_pipe (bool mask, bool xfer) if (!!masked != mask && xfer && (need_gdb_xfer || need_xfer)) { if (mask && get_ttyp ()->pty_input_state_eq (tty::to_nat)) - transfer_input (tty::to_cyg, get_handle_nat (), get_ttyp (), - input_available_event); + { + acquire_attach_mutex (mutex_timeout); + transfer_input (tty::to_cyg, get_handle_nat (), get_ttyp (), + input_available_event); + release_attach_mutex (); + } else if (!mask && get_ttyp ()->pty_input_state_eq (tty::to_cyg)) - transfer_input (tty::to_nat, get_handle (), get_ttyp (), - input_available_event); + { + acquire_attach_mutex (mutex_timeout); + transfer_input (tty::to_nat, get_handle (), get_ttyp (), + input_available_event); + release_attach_mutex (); + } } ReleaseMutex (input_mutex); } @@ -2261,9 +2277,11 @@ fhandler_pty_master::write (const void *ptr, size_t len) if (get_readahead_valid ()) accept_input (); WaitForSingleObject (input_mutex, mutex_timeout); + acquire_attach_mutex (mutex_timeout); fhandler_pty_slave::transfer_input (tty::to_nat, from_master, get_ttyp (), input_available_event); + release_attach_mutex (); ReleaseMutex (input_mutex); } get_ttyp ()->pcon_start_pid = 0; @@ -2315,8 +2333,12 @@ fhandler_pty_master::write (const void *ptr, size_t len) non-cygwin app is terminated if pseudo console is disabled. */ if (to_be_read_from_nat_pipe () && !get_ttyp ()->pcon_activated && get_ttyp ()->pty_input_state == tty::to_cyg) - fhandler_pty_slave::transfer_input (tty::to_nat, from_master, - get_ttyp (), input_available_event); + { + acquire_attach_mutex (mutex_timeout); + fhandler_pty_slave::transfer_input (tty::to_nat, from_master, + get_ttyp (), input_available_event); + release_attach_mutex (); + } ReleaseMutex (input_mutex); line_edit_status status = line_edit (p, len, ti, &ret); @@ -4038,8 +4060,10 @@ fhandler_pty_slave::setup_for_non_cygwin_app (bool nopcon, PWCHAR envblock, && stdin_is_ptys && get_ttyp ()->pty_input_state_eq (tty::to_cyg)) { WaitForSingleObject (input_mutex, mutex_timeout); + acquire_attach_mutex (mutex_timeout); transfer_input (tty::to_nat, get_handle (), get_ttyp (), input_available_event); + release_attach_mutex (); ReleaseMutex (input_mutex); } } @@ -4054,8 +4078,10 @@ fhandler_pty_slave::cleanup_for_non_cygwin_app (handle_set_t *p, tty *ttyp, && ttyp->pty_input_state_eq (tty::to_nat)) { WaitForSingleObject (p->input_mutex, mutex_timeout); + acquire_attach_mutex (mutex_timeout); transfer_input (tty::to_cyg, p->from_master_nat, ttyp, p->input_available_event); + release_attach_mutex (); ReleaseMutex (p->input_mutex); } WaitForSingleObject (p->pipe_sw_mutex, INFINITE); @@ -4080,8 +4106,10 @@ fhandler_pty_slave::setpgid_aux (pid_t pid) && get_ttyp ()->pty_input_state_eq (tty::to_cyg)) { WaitForSingleObject (input_mutex, mutex_timeout); + acquire_attach_mutex (mutex_timeout); transfer_input (tty::to_nat, get_handle (), get_ttyp (), input_available_event); + release_attach_mutex (); ReleaseMutex (input_mutex); } else if (was_nat_fg && !nat_fg && get_ttyp ()->switch_to_nat_pipe @@ -4103,11 +4131,15 @@ fhandler_pty_slave::setpgid_aux (pid_t pid) resume_pid = attach_console_temporarily (target_pid); attach_restore = true; } + else + acquire_attach_mutex (mutex_timeout); WaitForSingleObject (input_mutex, mutex_timeout); transfer_input (tty::to_cyg, from, get_ttyp (), input_available_event); ReleaseMutex (input_mutex); if (attach_restore) resume_from_temporarily_attach (resume_pid); + else + release_attach_mutex (); } ReleaseMutex (pipe_sw_mutex); }
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