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Convert the pwnam cache to memcache

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(This used to be commit 032c5589fe)
This commit is contained in:
Volker Lendecke 2007-12-20 14:54:33 +01:00
parent d3d870cc07
commit 44d086a15f
1 changed files with 15 additions and 53 deletions
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68
source3/lib/util_pw.c
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@ -37,74 +37,36 @@ struct passwd *tcopy_passwd(TALLOC_CTX *mem_ctx, const struct passwd *from)
return ret;
}
#define PWNAMCACHE_SIZE 4
static struct passwd **pwnam_cache = NULL;
static void init_pwnam_cache(void)
{
if (pwnam_cache != NULL)
return;
pwnam_cache = TALLOC_ZERO_ARRAY(NULL, struct passwd *,
PWNAMCACHE_SIZE);
if (pwnam_cache == NULL) {
smb_panic("Could not init pwnam_cache");
}
return;
}
void flush_pwnam_cache(void)
{
TALLOC_FREE(pwnam_cache);
pwnam_cache = NULL;
init_pwnam_cache();
memcache_flush(NULL, GETPWNAM_CACHE);
}
struct passwd *getpwnam_alloc(TALLOC_CTX *mem_ctx, const char *name)
{
int i;
struct passwd *temp, *cached;
struct passwd *temp;
init_pwnam_cache();
for (i=0; i<PWNAMCACHE_SIZE; i++) {
if ((pwnam_cache[i] != NULL) &&
(strcmp(name, pwnam_cache[i]->pw_name) == 0)) {
DEBUG(10, ("Got %s from pwnam_cache\n", name));
return tcopy_passwd(mem_ctx, pwnam_cache[i]);
}
temp = (struct passwd *)memcache_lookup_talloc(
NULL, GETPWNAM_CACHE, data_blob_string_const(name));
if (temp != NULL) {
return tcopy_passwd(mem_ctx, temp);
}
temp = sys_getpwnam(name);
if (!temp) {
#if 0
if (errno == ENOMEM) {
/* what now? */
}
#endif
if (temp == NULL) {
return NULL;
}
for (i=0; i<PWNAMCACHE_SIZE; i++) {
if (pwnam_cache[i] == NULL)
break;
cached = tcopy_passwd(NULL, temp);
if (cached == NULL) {
/*
* Just don't add this into the cache, ignore the failure
*/
return temp;
}
if (i == PWNAMCACHE_SIZE)
i = rand() % PWNAMCACHE_SIZE;
if (pwnam_cache[i] != NULL) {
/* Remove this old cache entry, from the cache. We
* use talloc_unlink here because we want to be very
* clear which referece we are removing */
talloc_unlink(pwnam_cache, pwnam_cache[i]);
}
pwnam_cache[i] = tcopy_passwd(pwnam_cache, temp);
memcache_add_talloc(NULL, GETPWNAM_CACHE, data_blob_string_const(name),
cached);
return tcopy_passwd(mem_ctx, temp);
}