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#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include "module.h"
static void free_deps(struct dependency_module** deps) {
assert(deps);
while (*deps) {
struct dependency_module *next = (*deps)->next;
lt_dlclose((*deps)->dl);
free(deps);
*deps = next;
}
}
static int load_deps(const char *fname, struct dependency_module **deps) {
char line[PATH_MAX];
FILE *f;
char depfile[PATH_MAX];
assert(fname && deps);
snprintf(depfile, sizeof(depfile), "%s.moddep", fname);
if (!(f = fopen(depfile, "r")))
return -1;
while (fgets(line, sizeof(line)-1, f)) {
lt_dlhandle dl;
char *p;
size_t l;
struct dependency_module* d;
p = line + strspn(line, " \t");
l = strlen(p);
if (p[l-1] == '\n')
p[l-1] = 0;
if (*p == '#' || *p == 0)
continue;
load_deps(p, deps);
if (!(dl = lt_dlopenext(p))) {
free_deps(deps);
fclose(f);
return -1;
}
d = malloc(sizeof(struct dependency_module));
assert(d);
d->dl = dl;
d->next = *deps;
*deps = d;
}
fclose(f);
return 0;
}
struct module* module_load(struct core *c, const char *name, const char *argument) {
struct module *m = NULL;
int r;
assert(c && name);
m = malloc(sizeof(struct module));
assert(m);
m->dl = NULL;
m->dependencies = NULL;
if (load_deps(name, &m->dependencies) < 0)
goto fail;
if (!(m->dl = lt_dlopenext(name)))
goto fail;
if (!(m->init = lt_dlsym(m->dl, "module_init")))
goto fail;
if (!(m->done = lt_dlsym(m->dl, "module_done")))
goto fail;
m->name = strdup(name);
m->argument = argument ? strdup(argument) : NULL;
m->userdata = NULL;
m->core = c;
assert(m->init);
if (m->init(c, m) < 0)
goto fail;
if (!c->modules)
c->modules = idxset_new(NULL, NULL);
assert(c->modules);
r = idxset_put(c->modules, m, &m->index);
assert(r >= 0 && m->index != IDXSET_INVALID);
return m;
fail:
if (m) {
if (m->dl)
lt_dlclose(m->dl);
free_deps(&m->dependencies);
free(m);
}
return NULL;
}
static void module_free(struct module *m) {
assert(m && m->done && m->core);
m->done(m->core, m);
lt_dlclose(m->dl);
free_deps(&m->dependencies);
free(m->name);
free(m->argument);
free(m);
}
void module_unload(struct core *c, struct module *m) {
assert(c && m);
assert(c->modules);
if (!(m = idxset_remove_by_data(c->modules, m, NULL)))
return;
module_free(m);
}
void module_unload_by_index(struct core *c, uint32_t index) {
struct module *m;
assert(c && index != IDXSET_INVALID);
assert(c->modules);
if (!(m = idxset_remove_by_index(c->modules, index)))
return;
module_free(m);
}
void free_callback(void *p, void *userdata) {
struct module *m = p;
assert(m);
module_free(m);
}
void module_unload_all(struct core *c) {
assert(c);
if (!c->modules)
return;
idxset_free(c->modules, free_callback, NULL);
c->modules = NULL;
}
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