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7b1cd20696
flatpak_close_fds_workaround() wasn't technically async-signal-safe, because the requirement for sysconf() to be async-signal-safe was removed in POSIX.1-2008. It could also leave high fds open in some cases: in practice sysconf(_SC_OPEN_MAX) returns the soft resource limit, but if our resource limit has been reduced by an ancestor process, we could conceivably still have fds open and inherited above that number. We can fix this by using g_fdwalk_set_cloexec() with GLib >= 2.79.2, or the backport in libglnx with older GLib. This uses close_range() if possible, falling back to rummaging in /proc with async-signal-safe syscalls. Signed-off-by: Simon McVittie <smcv@collabora.com>
115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
/* vi:set et sw=2 sts=2 cin cino=t0,f0,(0,{s,>2s,n-s,^-s,e-s:
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* Copyright © 2019 Red Hat, Inc
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authors:
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* Alexander Larsson <alexl@redhat.com>
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*/
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#include "config.h"
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#include "flatpak-utils-base-private.h"
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#include <stdlib.h>
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#include <string.h>
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#include <gio/gio.h>
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#include "libglnx.h"
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char *
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flatpak_get_timezone (void)
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{
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g_autofree gchar *symlink = NULL;
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gchar *etc_timezone = NULL;
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const gchar *tzdir;
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const gchar *default_tzdir = "/usr/share/zoneinfo";
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symlink = flatpak_resolve_link ("/etc/localtime", NULL);
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if (symlink != NULL)
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{
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/* Resolve relative path */
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g_autofree gchar *canonical = flatpak_canonicalize_filename (symlink);
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char *canonical_suffix;
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/* Strip the prefix and slashes if possible. */
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tzdir = getenv ("TZDIR");
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if (tzdir != NULL && g_str_has_prefix (canonical, tzdir))
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{
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canonical_suffix = canonical + strlen (tzdir);
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while (*canonical_suffix == '/')
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canonical_suffix++;
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return g_strdup (canonical_suffix);
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}
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if (g_str_has_prefix (canonical, default_tzdir))
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{
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canonical_suffix = canonical + strlen (default_tzdir);
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while (*canonical_suffix == '/')
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canonical_suffix++;
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return g_strdup (canonical_suffix);
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}
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}
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if (g_file_get_contents ("/etc/timezone", &etc_timezone,
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NULL, NULL))
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{
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g_strchomp (etc_timezone);
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return etc_timezone;
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}
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/* Final fall-back is UTC */
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return g_strdup ("UTC");
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}
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char *
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flatpak_readlink (const char *path,
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GError **error)
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{
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return glnx_readlinkat_malloc (-1, path, NULL, error);
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}
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char *
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flatpak_resolve_link (const char *path,
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GError **error)
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{
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g_autofree char *link = flatpak_readlink (path, error);
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g_autofree char *dirname = NULL;
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if (link == NULL)
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return NULL;
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if (g_path_is_absolute (link))
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return g_steal_pointer (&link);
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dirname = g_path_get_dirname (path);
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return g_build_filename (dirname, link, NULL);
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}
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/*
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* Syntactically canonicalize a filename, similar to
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* g_canonicalize_filename() in newer GLib.
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*
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* This function does not do I/O.
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*/
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char *
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flatpak_canonicalize_filename (const char *path)
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{
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g_autoptr(GFile) file = g_file_new_for_path (path);
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return g_file_get_path (file);
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}
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