There are two variables which are used to pass state from the Unix
signal handler interrupt function to the rest of `gmain.c`. They are
currently defined as `sig_atomic_t`, which means that they are
guaranteed to be interrupt safe. However, it does not guarantee they are
thread-safe, and GLib attaches its signal handler interrupt function to
a worker thread.
Make them thread-safe using atomics. It’s not possible to use locks, as
pthread mutex functions are not signal-handler-safe. In particular, this
means we have to be careful not to end up using GLib’s fallback atomics
implementation, as that secretly uses a mutex. Better to be unsafe than
have a re-entrant call into `pthread_mutex_lock()` from a nested signal
handler.
This commit solves two problems:
1. Writes to `any_unix_signal_pending` and `unix_signal_pending` could
be delivered out of order to the worker thread which calls
`dispatch_unix_signals()`, resulting in signals not being handled
until the next iteration of that worker thread. This is a
performance problem but not a correctness problem.
2. Setting an element of `unix_signal_pending` from
`g_unix_signal_handler()` and clearing it from
`dispatch_unix_signals_unlocked()` (in the worker thread) could
race, resulting in a signal emission being cleared without being
handled. That’s a correctness problem.
Signed-off-by: Philip Withnall <withnall@endlessm.com>
Fixes: #1670
The G_FILE_ATTRIBUTE_FILESYSTEM_REMOTE is set to TRUE only for NFS
filesystem types currently. Let's add also SMB filesystem types. This
also changes g_local_file_is_nfs_home function logic to handle only
NFS filesystems.
The g_local_file_is_remote function is misleading as it works only for
NFS filesystem types and only for locations in home directorly. Let's
rename it to g_local_file_is_nfs_home to make it obvious.
statfs/statvfs is called several times when querying filesystem info.
This is because the G_FILE_ATTRIBUTE_FILESYSTEM_REMOTE attribute is set
over is_remote_fs function, which calls statfs/statvfs again. Let's use
the already known fstype instead of redundant statfs/statvfs calls.
This also changes g_local_file_is_remote implementation to use
g_local_file_query_filesystem_info to obtain fstype, which allows to
remove duplicated code from is_remote_fs function.
The G_FILE_ATTRIBUTE_FILESYSTEM_REMOTE currently works only for locations
in the home directory. Let's make it work also for files outside the home
directory.
There are glocalfile.h and glocalfileprivate.h header files currently.
None of those header files is public, so it doesn't make sense to have
two private headers for glocalfile.c. Let's remove glocalfileprivate.h.
Suppress the cached charset from `g_get_charset()`, and widen the
suppression of the global random number `GRand` instance, since it can
be used outside test cases.
Signed-off-by: Philip Withnall <withnall@endlessm.com>
Fixes: #2134
We need to include the isnan*.c sources as necessary, if any of the
isnan*() functions cannot be found, so that builds on compilers that
lack these functions could be fixed.
Also, if we do have the isnan*() functions, improve the build by not
unnecessarily including the isnan*.c sources in the build.
If the isnan*() functions are found, make sure that the
HAVE_ISNAN*_IN_LIBC macros are defined in the CFLags, so that we do not
accidently require the gnulib implementations for these functions.
The implementation didn’t match the documentation. The implementation
has the right behaviour (wrt not allowing embedded nuls, validating
UTF-8, and returning a default value if an invalid string is detected),
so keep that and fix the documentation to match.
The [`GVariant`
specification](https://people.gnome.org/~desrt/gvariant-serialisation.pdf)
is incorrect on this point, and the implementation of GLib was
purposefully changed after the specification was published (but before
`GVariant` became API-stable in GLib). The behaviour in GLib
(specifically concerning all strings being in UTF-8) is consistent with
D-Bus.
Spotted by William Manley.
Signed-off-by: Philip Withnall <withnall@endlessm.com>
This was mostly machine generated with the following command:
```
codespell \
--builtin clear,rare,usage \
--skip './po/*' --skip './.git/*' --skip './NEWS*' \
--write-changes .
```
using the latest git version of `codespell` as per [these
instructions](https://github.com/codespell-project/codespell#user-content-updating).
Then I manually checked each change using `git add -p`, made a few
manual fixups and dropped a load of incorrect changes.
There are still some outdated or loaded terms used in GLib, mostly to do
with git branch terminology. They will need to be changed later as part
of a wider migration of git terminology.
If I’ve missed anything, please file an issue!
Signed-off-by: Philip Withnall <withnall@endlessm.com>
In glib-networking#127, it was reported that we don't properly implement
the documented behavior of these properties. However, we cannot fix it
because libsoup relies on the implemented behavior, and it's hard to
change that without cascading breakage. The practical solution is to
adjust our documentation to match reality. There should be no downsides
to this, and compat risk of changing the documentation is much smaller
than risk of changing the implementation, so I think this is the best we
can make of an unfortunate situation. See glib-networking#127 for full
discussion and glib-networking#129 for the regression when we attempted
to match the documented behavior.
`base` can be `-1` in some situations, which would lead to pointing
outside an allocation area if the sums were evaluated as `(file_name +
base) + 1` rather than `file_name + (base + 1)`.
I don’t see how this can practically cause an issue, as the arithmetic
is all finished before anything’s dereferenced, but let’s keep to the
letter of the C standard to avoid this coming up in code audits in
future.
Fix suggested by fablhx.
Signed-off-by: Philip Withnall <withnall@endlessm.com>
Closes: #2077
Some editors automatically remove trailing blank lines, or
automatically add a trailing newline to avoid having a trailing
non-blank line that is not terminated by a newline. To avoid unrelated
whitespace changes when users of such editors contribute to GLib,
let's pre-emptively normalize all files.
Unlike more intrusive whitespace normalization like removing trailing
whitespace from each line, this seems unlikely to cause significant
issues with cherry-picking changes to stable branches.
Implemented by:
find . -name '*.[ch]' -print0 | \
xargs -0 perl -0777 -p -i -e 's/\n+\z//g; s/\z/\n/g'
Signed-off-by: Simon McVittie <smcv@collabora.com>
cc.has_function() provide false positive for Android-20 and earlier; the fix is in Meson 0.54.2. People attempting to cross-compile previously wouldn’t have been able to get it to work without manual intervention, so the dependency bump for this platform is not an additional obstacle for them.
While these assertions look right at the first glance,
they actually crash the program. That's because GObject
insists on initializing all construct-only properties
to their default values, which results in
g_win32_registry_key_set_property() being called multiple
times with NULL string, once for each unset property.
If "path" is actually set by the caller, a subsequent
call to set "path-utf16" to NULL will fail an assertion,
since absolute_path is already non-NULL.
With assertions moved the set-to-NULL calls bail out before
an assertion is made.
