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glib-unix: Add g_closefrom(), g_fdwalk_set_cloexec()

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These are the same as Linux `close_range (lowfd, ~0U, 0)` and
`close_range (lowfd, ~0U, CLOSE_RANGE_CLOEXEC)`, but portable.
Unlike some implementations of BSD closefrom(3), they are
async-signal-safe.

The implementations were moved from the GSpawn code, which already
needs all of this functionality anyway, with the exception of
set_cloexec() which was copied (leading to some minor duplication,
but it's very simple).

Resolves: https://gitlab.gnome.org/GNOME/glib/-/issues/3247
Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie
2024-02-05 20:26:52 +00:00
parent 0701943d9f
commit 69c1a05ede
3 changed files with 427 additions and 335 deletions
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6
glib/glib-unix.h
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@@ -326,6 +326,12 @@ g_unix_pipe_clear (GUnixPipe *self)
G_DEFINE_AUTO_CLEANUP_CLEAR_FUNC (GUnixPipe, g_unix_pipe_clear)
GLIB_AVAILABLE_IN_2_80
int g_closefrom (int lowfd);
GLIB_AVAILABLE_IN_2_80
int g_fdwalk_set_cloexec (int lowfd);
G_GNUC_END_IGNORE_DEPRECATIONS
G_END_DECLS