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/*
net-sendbuffer.c : Buffered send()
Copyright (C) 1998-2000 Timo Sirainen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "module.h"
#include "network.h"
#include "net-sendbuffer.h"
struct _NET_SENDBUF_REC {
GIOChannel *handle;
int bufsize;
int bufpos;
char *buffer; /* Buffer is NULL until it's actually needed. */
};
static GSList *buffers;
static int timeout_tag;
/* Create new buffer - if `bufsize' is zero or less, DEFAULT_BUFFER_SIZE
is used */
NET_SENDBUF_REC *net_sendbuffer_create(GIOChannel *handle, int bufsize)
{
NET_SENDBUF_REC *rec;
g_return_val_if_fail(handle != NULL, NULL);
rec = g_new0(NET_SENDBUF_REC, 1);
rec->handle = handle;
rec->bufsize = bufsize > 0 ? bufsize : DEFAULT_BUFFER_SIZE;
buffers = g_slist_append(buffers, rec);
return rec;
}
/* Destroy the buffer. `close' specifies if socket handle should be closed. */
void net_sendbuffer_destroy(NET_SENDBUF_REC *rec, int close)
{
buffers = g_slist_remove(buffers, rec);
if (close) net_disconnect(rec->handle);
g_free_not_null(rec->buffer);
g_free(rec);
}
/* Transmit all data from buffer - return TRUE if successful */
static int buffer_send(NET_SENDBUF_REC *rec)
{
int ret;
ret = net_transmit(rec->handle, rec->buffer, rec->bufpos);
if (ret < 0 || rec->bufpos == ret) {
/* error/all sent - don't try to send it anymore */
g_free_and_null(rec->buffer);
return TRUE;
}
if (ret > 0) {
rec->bufpos -= ret;
memmove(rec->buffer, rec->buffer+ret, rec->bufpos);
}
return FALSE;
}
static int sig_sendbuffer(void)
{
GSList *tmp;
int stop;
stop = TRUE;
for (tmp = buffers; tmp != NULL; tmp = tmp->next) {
NET_SENDBUF_REC *rec = tmp->data;
if (rec->buffer != NULL) {
if (!buffer_send(rec))
stop = FALSE;
}
}
if (stop) timeout_tag = -1;
return !stop;
}
/* Add `data' to transmit buffer - return FALSE if buffer is full */
static int buffer_add(NET_SENDBUF_REC *rec, const void *data, int size)
{
if (rec->buffer == NULL) {
rec->buffer = g_malloc(rec->bufsize);
rec->bufpos = 0;
}
if (rec->bufpos+size > rec->bufsize)
return FALSE;
memcpy(rec->buffer+rec->bufpos, data, size);
rec->bufpos += size;
return TRUE;
}
/* Send data, if all of it couldn't be sent immediately, it will be resent
automatically after a while. Returns -1 if some unrecoverable error
occured. */
int net_sendbuffer_send(NET_SENDBUF_REC *rec, const void *data, int size)
{
int ret;
g_return_val_if_fail(rec != NULL, -1);
g_return_val_if_fail(data != NULL, -1);
if (size <= 0) return 0;
if (rec->buffer == NULL) {
/* nothing in buffer - transmit immediately */
ret = net_transmit(rec->handle, data, size);
if (ret < 0) return -1;
size -= ret;
data = ((char *) data) + ret;
}
if (size > 0) {
/* everything couldn't be sent. */
if (timeout_tag == -1) {
timeout_tag = g_timeout_add(100, (GSourceFunc)
sig_sendbuffer, NULL);
}
if (!buffer_add(rec, data, size))
return -1;
}
return 0;
}
/* Returns the socket handle */
GIOChannel *net_sendbuffer_handle(NET_SENDBUF_REC *rec)
{
g_return_val_if_fail(rec != NULL, NULL);
return rec->handle;
}
void net_sendbuffer_init(void)
{
timeout_tag = -1;
buffers = NULL;
}
void net_sendbuffer_deinit(void)
{
if (timeout_tag != -1) g_source_remove(timeout_tag);
}
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