[Bug 794591] New: gst-play-1.0 leaves stdin in non-blocking mode

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794591

            Bug ID: 794591
           Summary: gst-play-1.0 leaves stdin in non-blocking mode
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: ao2 at ao2.it
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Hi,

I noticed that *after* executing "gst-play-1.0 SOMEFILE" in bash, interactive
cli programs that handle stdin in a special way start to misbehave.

One simple example is:

  read SOMEVAR

which fails with the following error:

  bash: read: read error: 0: Resource temporarily unavailable

Another command which fails is:

  git add -p

where the interactive prompt to choose the action stops working.

The same effect of running gst-play-1.0 can be simulated with this command:

  python3 -c $'import os\nos.set_blocking(0, False)'

so it looks like gst-play-1.0 is not resetting the stdin blocking status
correctly.

This is my environment:
Debian Unstable
GStreamer Core Library version 1.14.0
GNU bash, version 4.4.18(1)-release (x86_64-pc-linux-gnu)

The issue does not seem to happen to everybody, Jan Schmidt told me on IRC:

<thaytan> ao2, definitely doesn't happen on Fedora with bash 4.4.19 (or any
other version in the last few years)

The issue does not occur with dash (the Debian POSIX shell), which seems to
reset the blocking status automatically and warns with the following message:

  sh: turning off NDELAY mode 

However the problem occurs every time here with bash.

I took a look at the code and I am going to send a proof-of-concept patch which
fixes the issue.

Thanks,
   Antonio

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