feature/pgtk 9d9c828 025/100: TIMERFD support for PGTK, prevent calling when timerfd<0

[Yuuki Harano]

branch: feature/pgtk
commit 9d9c8284fe224932f093e972b81e3c36fdce168b
Author: Yuuki Harano <masm+github@masm11.me>
Commit: Jeff Walsh <fejfighter@gmail.com>

    TIMERFD support for PGTK, prevent calling when timerfd<0
    
        * ../src/atimer.c (set_alarm):
---
 src/atimer.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/src/atimer.c b/src/atimer.c
index a7daf9d..df123e11 100644
--- a/src/atimer.c
+++ b/src/atimer.c
@@ -309,11 +309,13 @@ set_alarm (void)
          ispec.it_value = atimers->expiration;
          ispec.it_interval.tv_sec = ispec.it_interval.tv_nsec = 0;
 # ifdef HAVE_TIMERFD
-         if (timerfd_settime (timerfd, TFD_TIMER_ABSTIME, &ispec, 0) == 0)
-           {
-             add_timer_wait_descriptor (timerfd);
-             return;
-           }
+         if (timerfd >= 0) {
+           if (timerfd_settime (timerfd, TFD_TIMER_ABSTIME, &ispec, 0) == 0)
+              {
+                add_timer_wait_descriptor (timerfd);
+                return;
+              }
+         }
 # endif
          if (alarm_timer_ok
              && timer_settime (alarm_timer, TIMER_ABSTIME, &ispec, 0) == 0)
@@ -461,7 +463,8 @@ turn_on_atimers (bool on)
       if (alarm_timer_ok)
        timer_settime (alarm_timer, TIMER_ABSTIME, &ispec, 0);
 # ifdef HAVE_TIMERFD
-      timerfd_settime (timerfd, TFD_TIMER_ABSTIME, &ispec, 0);
+      if (timerfd >= 0)
+       timerfd_settime (timerfd, TFD_TIMER_ABSTIME, &ispec, 0);
 # endif
 #endif
       alarm (0);
@@ -568,6 +571,9 @@ have_buggy_timerfd (void)
 # ifdef CYGWIN
   struct utsname name;
   return uname (&name) < 0 || strverscmp (name.release, "3.0.2") < 0;
+# elif defined HAVE_PGTK
+  /* pgtk emacs does not want timerfd. */
+  return true;
 # else
   return false;
 # endif