seems to have stopped crashing now...

This defines some constants and syscall wrappers for features which may
not yet have appeared in the libc.

 1) mmap() of a 0-sized region is EINVAL, so don't try that

 2) MAP_SHARED on a sealed memfd fails for some reason, so use
    MAP_PRIVATE instead

Remove this one outstanding case of direct construction of GVariant
instances and port it to use g_variant_alloc() like everyone else.

Take GVariantTypeInfo instead of a GVariantType on the internal
constructors for GVariant.

Although this results in a bit more code for almost every call, it turns
out that it makes most uses more convenient -- that fact that we consume
the GVariantInfo means that we don't have to go back to free the type
when we're done.

This change will allow us to port g_variant_get_child() over to using
g_variant_alloc().  It was the one outstanding place where we
constructed GVariant instances that was not yet using it.

Add a new pair of internal helpers to gvariant-core.c to provide a
unified way to construct and query the content of serialised GVariant
instances.

Rewrite g_variant_new_from_data() to use this.

Move g_variant_new_from_bytes() and g_variant_get_data_as_bytes() out of
-core and into gvariant.c, also rewriting them to use the same.

Take the time to do some cleanup and make some general improvements in
consistency:

 - move the checks for improperly sized fixed-sized data out of
   _new_from_bytes() and into the common code so that we do this check
   on _new_from_data() as well

 - correctly deal with the case of NULL data in _get_data_as_bytes().
   This would have crashed before.  Add a test for that.

 - if the user hands us data with a size of zero then unref and/or
   destroy-notify things immediately.

The idea that every GVariant must have an associated GBytes remains.
This could potentially be optimsed a bit further in the future, but the
cases where it could be avoided are only a few (errors, zero-size,
static stoarge) so let's not pursue that now.

Add a new type 'f' to correspond to single precision floating point
values.

This type was never added to D-Bus for two reasons:

 1) there is no benefit to using float rather than doubles as parameters
    for RPC

 2) classically, you shouldn't move bulk data over D-Bus

Now that we've decided that we want to use D-Bus for bulk data
transfers, it makes a good deal of sense to want to send an array of
floats or an array of fixed-sized tuples containing floats.

https://bugzilla.gnome.org/show_bug.cgi?id=740897

Generate a random value and make sure we get the same result as doing it
the 'usual' way (which is already subject to a whole lot of testing).

Add code for serialising GVariant to GVariantVectors.

Export that internally via the glib-private machanism so that we can use
it from GDBus.

This structure (and its associated functions) will be used as an
intermediate step for serialising GVariant instance onto kdbus without
copying large amounts of data.

Change the internal g_variant_ensure_serialised() helper over to working
on unlocked instances and have it conditionally acquire the lock using
the utility function added in the last commit.

Many of the core GVariant operations have two modes: one for tree-form
and one for serialised.

Once a GVariant is in serialised form it will always be serialised, so
it is safe to simply check for that and proceed with the operation in
that case.

A tree-form GVariant instance always has a chance of being implicitly
serialised, however, so we have to take locks when performing operations
on these.

Write a helper function that reliably checks if the instance is in
tree-form, locking it if it is.  Rewrite some of the other functions to
use this helper.  In some cases this simplifies the code and in others
it reduces locking.

It's always possible to determine the serialised size of a GVariant
instance, even in the case that it is not yet serialised.  This can be
done by calling g_variant_get_size() which will base its answer on the
size of each child (which must be recursively determined).

We must perform this process before we can allocate the buffer to
serialise a GVariant into (since we must know the size of the buffer).
This means that serialising a GVariant involves two steps that recurse
through the entire tree of values.  We must take locks twice.

Simplify this by always determining the size when the instance is first
created, from the sizes of its children (which now will always be known
as well).  We can do this without taking any locks because the
newly-created instance has never been exposed and because the size on
the children is now a constant that can be directly accessed without a
lock.

This is a reduction in complexity and will also be a performance
improvement in all cases where a GVariant is serialised.  It will be a
slight performance hit in the case that we construct tree-form instances
and never serialise them.

Add a way to get the zero-copy fd back out of a GBytes that was created
from one.

This function takes a memfd, seals it, and creates a GBytes based on it.

David King authored Dec 02, 2014 and Allison Karlitskaya committed Dec 02, 2014

Add a function that checks if a fd is sealed and, if it's not, seals it.

On Linux this is more or less an operation on memfd.  On other systems,
it currently always returns FALSE.

We have a wide variety of different sources of data for GBytes.

Instead of having all possibilities inside of a single structure type,
add a 'type' field and a couple of subtypes.

This also forces us to clean up our access to the ->data pointer from
all over the code which may become a problem in the future if we want to
lazy-map memfd GBytes instances by keeping the data pointer as NULL
until we are ready to use it.

We also introduce a new type of GBytes: 'inline'.  This allows us to
make a single allocation instead of two in the g_bytes_new() case.

Add g_assert_se(), g_return_if_fail_se() and g_return_val_if_fail_se()
as variants of the existing macros that are guaranteed to evaluate side
effects in their expression argument.  Inspired by similar macros in
systemd.

These are just macros, so they come at no extra cost.

https://bugzilla.gnome.org/show_bug.cgi?id=741026

https://bugzilla.gnome.org/show_bug.cgi?id=741016

next time I should definitely try to compile after a rebase conflict...

It adds a new error G_IO_ERROR_NOT_CONNECTED
and makes the win32 error ERROR_PIPE_LISTENING
to be translated to it.

https://bugzilla.gnome.org/show_bug.cgi?id=741016

Signed-off-by: Trần Ngọc Quân <vnwildman@gmail.com>

Add G_IO_ERROR_CONNECTION_CLOSED as an alias for
G_IO_ERROR_BROKEN_PIPE, and also return it on ECONNRESET.

It doesn't really make sense to try to distinguish EPIPE and
ECONNRESET at the GLib level, since the exact choice of which error
gets returned in what conditions depends on the OS. Given that, we
ought to map the two errors to the same value, and since we're already
mapping EPIPE to G_IO_ERROR_BROKEN_PIPE, we need to map ECONNRESET to
that too. But the existing name doesn't really make sense for sockets,
so we add a new name.

https://bugzilla.gnome.org/show_bug.cgi?id=728928

This is a convenience method for creating a GNetworkAddress which is
guaranteed to return IPv4 and IPv6 loopback addresses. The program
cannot guarantee that 'localhost' will resolve to both types of
address, so programs which wish to connect to a local service over
either IPv4 or IPv6 must currently manually create an IPv4 and another
IPv6 socket, and detect which of the two are working. This new API
allows the existing GSocketConnectable machinery to be used to
automate that.

Based on a patch from Philip Withnall.

https://bugzilla.gnome.org/show_bug.cgi?id=732317

Allocate some larger strings in the testcase to make sure we handle them
correctly as well.

We intend to keep the list of poll records sorted by (integer) file
descriptor, but due to a typo we are actually keeping it sorted by
pointer address of the GPollFD.

Fix that.

https://bugzilla.gnome.org/show_bug.cgi?id=11059

As evidenced by a mistake that I made recently, this documentation could
use a little bit of clarification.

g_settings_has_signal_handlers() checks whether any of the signals has
pending handlers. However, g_signal_has_handler_pending() matches on
exact detail, even when passing 0. Subscribing to one of GSettings'
signals with a detail will fail this check and never connect to the
backend.

Fix this by calling has_handler_pending() with the key as detail as
well.

https://bugzilla.gnome.org/show_bug.cgi?id=740848

No need to keep our own copy of this in the testsuite.

Includes unit tests.

https://bugzilla.gnome.org/show_bug.cgi?id=685880

Add a GSocketListener test program. Currently the only test is a
regression test for bug 712570 (based on a standalone bug reproducer
provided by Ross Lagerwall).