getch2: assume EOF when input file descriptor is invalid

When starting mpv with nohup, file descriptor 0 seems to be invalid for
some reason. (I'm not quite sure why it should be... /proc/pid/fd/0
seems to indicate it's just /dev/null, and using /dev/null explicitly
shows that it works just fine.)

select() will always immediately return, and this causes mpv to burn CPU
without reason. Fix this by treating it as EOF when read() returns
EBADF.

Also add EINVAL to this condition, because it seems like a good idea.

1 files changed, 5 insertions, 2 deletions

diff --git a/osdep/getch2.c b/osdep/getch2.c
index 13eb47bc29..8b87e79c76 100644
--- a/osdep/getch2.c
+++ b/osdep/getch2.c
@@ -27,6 +27,7 @@
 #include <stdint.h>
 #include <string.h>
 #include <signal.h>
+#include <errno.h>
 #include <sys/ioctl.h>
 
 #ifdef HAVE_TERMIOS
@@ -366,8 +367,10 @@ bool getch2(struct input_ctx *input_ctx)
      * happen if the terminal state change done in getch2_enable()
      * works.
      */
-    if (retval < 1)
-        return retval;
+    if (retval == 0)
+        return false;
+    if (retval == -1)
+        return errno != EBADF && errno != EINVAL;
     getch2_len += retval;
 
     while (getch2_pos < getch2_len) {