mirror of
https://github.com/containers/fuse-overlayfs.git
synced 2025-08-03 18:05:58 -04:00
ba472b58bc
add a clang-format definition file and apply it to the code. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
/* fuse-overlayfs: Overlay Filesystem in Userspace
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Copyright (C) 2019 Red Hat Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define _GNU_SOURCE
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#define _FILE_OFFSET_BITS 64
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#include <config.h>
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#include <plugin.h>
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#include <stdlib.h>
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#include <fuse_overlayfs_error.h>
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#include <errno.h>
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#include <string.h>
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struct ovl_plugin_context *
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load_plugins (const char *plugins)
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{
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char *saveptr = NULL, *it;
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cleanup_free char *buf = NULL;
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struct ovl_plugin_context *ctx;
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ctx = calloc (1, sizeof (*ctx));
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if (ctx == NULL)
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error (EXIT_FAILURE, errno, "cannot allocate context");
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buf = strdup (plugins);
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if (buf == NULL)
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error (EXIT_FAILURE, errno, "cannot allocate memory");
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for (it = strtok_r (buf, ":", &saveptr); it; it = strtok_r (NULL, ":", &saveptr))
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plugin_load_one (ctx, it);
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return ctx;
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}
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void
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plugin_load_one (struct ovl_plugin_context *context, const char *path)
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{
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plugin_name name;
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struct ovl_plugin *p;
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plugin_version version;
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void *handle = dlopen (path, RTLD_NOW | RTLD_LOCAL);
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if (! handle)
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error (EXIT_FAILURE, 0, "cannot load plugin %s: %s", path, dlerror ());
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p = calloc (1, sizeof (*p));
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if (p == NULL)
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error (EXIT_FAILURE, errno, "cannot load plugin %s", path);
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p->next = context->plugins;
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version = dlsym (handle, "plugin_version");
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if (version == NULL)
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error (EXIT_FAILURE, 0, "cannot find symbol `plugin_version` in plugin %s", path);
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if (version () != 1)
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error (EXIT_FAILURE, 0, "invalid plugin version for %s", path);
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p->handle = handle;
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name = dlsym (handle, "plugin_name");
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if (name == NULL)
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error (EXIT_FAILURE, 0, "cannot find symbol `plugin_name` in plugin %s", path);
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p->name = name ();
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if (plugin_find (context, p->name))
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error (EXIT_FAILURE, 0, "plugin %s added twice", p->name);
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p->load = dlsym (handle, "plugin_load");
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if (p->load == NULL)
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error (EXIT_FAILURE, 0, "cannot find symbol `plugin_load` in plugin %s", path);
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p->release = dlsym (handle, "plugin_release");
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if (p->release == NULL)
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error (EXIT_FAILURE, 0, "cannot find symbol `plugin_release` in plugin %s", path);
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context->plugins = p;
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}
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struct ovl_plugin *
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plugin_find (struct ovl_plugin_context *context, const char *name)
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{
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struct ovl_plugin *it;
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for (it = context->plugins; it; it = it->next)
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{
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if (strcmp (name, it->name) == 0)
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return it;
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}
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return NULL;
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}
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int
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plugin_free_all (struct ovl_plugin_context *context)
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{
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struct ovl_plugin *it, *next;
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it = context->plugins;
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while (it)
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{
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next = it->next;
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it->release ();
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/* Skip dlclose (it->handle) as it causes plugins written in Go to crash. */
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free (it);
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it = next;
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}
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free (context);
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return 0;
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}
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