Files
glib/gio
Philip Withnall ef461fb391 gsubprocess: Globally ignore SIGPIPE
Just like we already do in `GSocket`.

This is necessary when using `g_subprocess_communicate()` with a
subprocess which calls `close()` on its stdin FD at some point. `cat`
does this just before exiting, for example.

This causes a `write()` to the stdin pipe in the parent process to fail
with `EPIPE` and `SIGPIPE`. The condition is not detectable in advance,
because the `close()` call could happen after the `GMainContext` has
dispatched a `g_subprocess_communicate()` callback.

If it weren’t for the `SIGPIPE`,`g_subprocess_communicate()` would be
able to handle the `EPIPE` just fine. `SIGPIPE` seems like a default
error handling path which was useful in 1980 for writing pipe-heavy
command line apps, but which is more of a broken stair for writing
larger modern apps which have more than one data flow path.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>

Fixes: #3310
2024-04-01 14:41:33 +01:00
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