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/*
* libusual - Utility library for C
*
* Copyright (c) 2010 Marko Kreen, Skype Technologies
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <usual/netdb.h>
#include <usual/socket.h>
#include <usual/list.h>
/* is compat function needed? */
#ifndef HAVE_GETADDRINFO_A
/* full compat if threads are available */
#ifdef HAVE_PTHREAD
#include <pthread.h>
#include <string.h>
/*
* Basic blocking lookup
*/
static void gaia_lookup(pthread_t origin, struct gaicb *list[], int nitems, struct sigevent *sevp)
{
struct gaicb *g;
int i, res;
for (i = 0; i < nitems; i++) {
g = list[i];
res = getaddrinfo(g->ar_name, g->ar_service, g->ar_request, &g->ar_result);
g->_state = res;
}
if (!sevp || sevp->sigev_notify == SIGEV_NONE) {
/* do nothing */
} else if (sevp->sigev_notify == SIGEV_SIGNAL) {
/* send signal */
pthread_kill(origin, sevp->sigev_signo);
} else if (sevp->sigev_notify == SIGEV_THREAD) {
/* call function */
sevp->sigev_notify_function(sevp->sigev_value);
}
}
/*
* Thread to run blocking lookup in
*/
struct GAIAContext {
struct List req_list;
pthread_cond_t cond;
pthread_mutex_t lock;
pthread_t thread;
};
struct GAIARequest {
struct List node;
pthread_t origin;
int nitems;
struct sigevent sev;
struct gaicb *list[FLEX_ARRAY];
};
#define RQ_SIZE(n) (offsetof(struct GAIARequest,list) + (n)*(sizeof(struct gaicb *)))
static void gaia_lock_reqs(struct GAIAContext *ctx)
{
pthread_mutex_lock(&ctx->lock);
}
static void gaia_unlock_reqs(struct GAIAContext *ctx)
{
pthread_mutex_unlock(&ctx->lock);
}
static void *gaia_lookup_thread(void *arg)
{
struct GAIAContext *ctx = arg;
struct GAIARequest *rq;
struct List *el;
gaia_lock_reqs(ctx);
while (1) {
el = list_pop(&ctx->req_list);
if (!el) {
pthread_cond_wait(&ctx->cond, &ctx->lock);
continue;
}
gaia_unlock_reqs(ctx);
rq = container_of(el, struct GAIARequest, node);
gaia_lookup(rq->origin, rq->list, rq->nitems, &rq->sev);
free(rq);
gaia_lock_reqs(ctx);
}
return NULL;
}
/*
* Functions run in user thread
*/
static int gaia_post_request(struct GAIAContext *ctx, struct gaicb *list[], int nitems, struct sigevent *sevp)
{
struct GAIARequest *rq;
rq = malloc(RQ_SIZE(nitems));
if (!rq)
return EAI_MEMORY;
list_init(&rq->node);
rq->origin = pthread_self();
rq->nitems = nitems;
if (sevp)
rq->sev = *sevp;
else
rq->sev.sigev_notify = SIGEV_NONE;
memcpy(rq->list, list, sizeof(struct gaicb *));
gaia_lock_reqs(ctx);
list_append(&ctx->req_list, &rq->node);
gaia_unlock_reqs(ctx);
pthread_cond_signal(&ctx->cond);
return 0;
}
static struct GAIAContext *gaia_create_context(void)
{
struct GAIAContext *ctx;
int err;
ctx = malloc(sizeof(*ctx));
if (!ctx)
return NULL;
list_init(&ctx->req_list);
err = pthread_cond_init(&ctx->cond, NULL);
if (err)
goto failed;
err = pthread_mutex_init(&ctx->lock, NULL);
if (err)
goto failed;
err = pthread_create(&ctx->thread, NULL, gaia_lookup_thread, ctx);
if (err)
goto failed;
return ctx;
failed:
free(ctx);
errno = err;
return NULL;
}
/*
* Final interface
*/
int getaddrinfo_a(int mode, struct gaicb *list[], int nitems, struct sigevent *sevp)
{
static struct GAIAContext *ctx;
if (nitems <= 0)
return 0;
if (sevp && sevp->sigev_notify != SIGEV_NONE
&& sevp->sigev_notify != SIGEV_SIGNAL
&& sevp->sigev_notify != SIGEV_THREAD)
goto einval;
if (mode == GAI_WAIT) {
gaia_lookup(pthread_self(), list, nitems, sevp);
return 0;
} else if (mode == GAI_NOWAIT) {
if (!ctx) {
ctx = gaia_create_context();
if (!ctx)
return EAI_MEMORY;
}
return gaia_post_request(ctx, list, nitems, sevp);
}
einval:
errno = EINVAL;
return EAI_SYSTEM;
}
#else /* without threads not much to do */
int getaddrinfo_a(int mode, struct gaicb *list[], int nitems, struct sigevent *sevp)
{
errno = ENOSYS;
return EAI_SYSTEM;
}
#endif /* !HAVE_PTHREAD_H */
#endif /* !HAVE_GETADDRINFO_A */
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