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75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
/*
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* Copyright (C) 2002 Sistina Software (UK) Limited.
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*
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* This file is released under the LGPL.
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*
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*/
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#include "lib.h"
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#include "locking_types.h"
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#include "defaults.h"
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#include "sharedlib.h"
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static void *_locking_lib = NULL;
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static void (*_end_fn) (void) = NULL;
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static int (*_lock_fn) (struct cmd_context * cmd, const char *resource,
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int flags) = NULL;
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static int (*_init_fn) (int type, struct config_tree * cft) = NULL;
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static int _lock_resource(struct cmd_context *cmd, const char *resource,
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int flags)
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{
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if (_lock_fn)
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return _lock_fn(cmd, resource, flags);
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else
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return 0;
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}
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static void _fin_external_locking(void)
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{
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if (_end_fn)
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_end_fn();
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dlclose(_locking_lib);
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_locking_lib = NULL;
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_init_fn = NULL;
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_end_fn = NULL;
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_lock_fn = NULL;
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}
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int init_external_locking(struct locking_type *locking, struct config_tree *cft)
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{
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const char *libname;
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if (_locking_lib) {
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log_error("External locking already initialised");
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return 1;
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}
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locking->lock_resource = _lock_resource;
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locking->fin_locking = _fin_external_locking;
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libname = find_config_str(cft->root, "global/locking_library",
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DEFAULT_LOCKING_LIB);
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if (!(_locking_lib = load_shared_library(cft, libname, "locking"))) {
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stack;
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return 0;
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}
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/* Get the functions we need */
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if (!(_init_fn = dlsym(_locking_lib, "init_locking")) ||
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!(_lock_fn = dlsym(_locking_lib, "lock_resource")) ||
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!(_end_fn = dlsym(_locking_lib, "end_locking"))) {
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log_error("Shared library %s does not contain locking "
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"functions", libname);
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dlclose(_locking_lib);
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_locking_lib = NULL;
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return 0;
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}
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log_verbose("Loaded external locking library %s", libname);
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return _init_fn(2, cft);
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}
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