This is a convenience wrapper around getpwnam_r() which handles all the
memory allocation faff.
Signed-off-by: Philip Withnall <withnall@endlessm.com>
Helps: #1687
Guarantee that user signal callback is dispatched _after_ receiving a
signal as long as the handler expresses continued interest in receiving
such a notification.
Previously if a signal has been received during user callback dispatch
but before pending flag had been cleared then the signal would be
irrevocably lost.
This is a very useful guarantee to have in cases where signals are used
to signify a need for synchronization with external resources. For
example: reloading configuration file after SIGUSR1 or retrieving a
terminal size after SIGWINCH.
ssize_t is supported widely, but not universally, so use gssize instead.
Currently only one piece of code actually *needs* this change to be compilable
with MSVC, the rest are mostly in *nix parts of the code, but these are changed
too, for symmetry.
https://bugzilla.gnome.org/show_bug.cgi?id=788180
On a heavily loaded system, it's possible that both our normal
condition *and* the timeout occurred. In that case we can just ignore
the timeout.
While I did add a "sig_timeout" boolean, we don't need to add any
assertions around whether or not it was reached - the assertions
covering the non-timeout case are sufficient. The sig_timeout boolean
is mainly for later debugging.
https://bugzilla.gnome.org/show_bug.cgi?id=700460
If someone creates a unix signal source for e.g. SIGINT, and then
removes it, reset the handler to SIG_DFL.
Not doing this was the source of race conditions in the
glib/tests/unix test, but this will also just make us a "good citizen"
by cleaning up.
For example, if a project temporarily creates a handler for SIGTERM,
and then later removes it, they almost certainly want SIGTERM to
revert to the default of terminating the process, rather than doing
nothing.
https://bugzilla.gnome.org/show_bug.cgi?id=704699
We can't reset the pending flag for a signal until we've traversed
the whole list, as the documentation clearly says that in case multiple
sources they all get invoked.
This is still racy if you get a signal after checking the flag
but before resetting it, but it was the same before. The correct
fix would be to use sigwait() or signalfd(), but that would mean
blocking all signals in all threads, which is not compatible
with existing applications.
https://bugzilla.gnome.org/show_bug.cgi?id=704322
Change the unix signal watch API to match other sources in both
available functions, names of those functions and order of the
parameters to the _full function.
https://bugzilla.gnome.org/show_bug.cgi?id=657705
This new API allows watching a few select Unix signals;
looking through the list on my system, I didn't see anything
else that I think it'd reasonable to watch.
We build on the previous patch to make the child watch helper thread
that existed on Unix handle these signals in the threaded case.
In the non-threaded case, they're just global variables.
https://bugzilla.gnome.org/show_bug.cgi?id=644941
GLib historically has been designed to be "mostly" portable; there
are some functions only available on Unix like g_io_channel_unix_new(),
but these are typically paired with obvious counterparts for Win32.
However, as GLib is used not only by portable software, but components
targeting Unix (or even just Linux), there are a few cases where it
would be very convenient if GLib shipped built-in functionality.
This initial patch is a basic wrapper around pipe2(), including
fallbacks for older kernels. This pairs well with the
existing g_spawn_*() API and its child_setup functionality.
However, in the future, I want to add a signal() wrapper here,
complete with proxying the signal to a mainloop. I have initial code
for this, but doing it sanely (including factoring out gmain.c's
private worker thread), is a complex task, and I don't want to block
on that.
See also gwin32.h for Win32 specific functionality.
https://bugzilla.gnome.org/show_bug.cgi?id=644941
