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/* Copyright ©2004-2006 Anselm R. Garbe <garbeam at gmail dot com>
* See LICENSE file for license details.
*/
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include "ixp_local.h"
/**
* Function: ixp_listen
*
* Params:
* fs - The file descriptor on which to listen.
* aux - A piece of data to store in the connection's
* T<IxpConn> data structure.
* read - The function to call when the connection has
* data available to read.
* close - A cleanup function to call when the
* connection is closed.
*
* Starts the server P<s> listening on P<fd>. The optional
* callbacks are called as described, with the connections
* T<IxpConn> data structure as their arguments.
*
* Returns:
* Returns the connection's new T<IxpConn> data
* structure.
*
* S<IxpConn>
*/
IxpConn*
ixp_listen(IxpServer *s, int fd, void *aux,
void (*read)(IxpConn *c),
void (*close)(IxpConn *c)
) {
IxpConn *c;
c = emallocz(sizeof *c);
c->fd = fd;
c->aux = aux;
c->srv = s;
c->read = read;
c->close = close;
c->next = s->conn;
s->conn = c;
return c;
}
/**
* Function: ixp_hangup
* Function: ixp_server_close
*
* ixp_hangup closes a connection, and stops the server
* listening on it. It calls the connection's close
* function, if it exists. ixp_server_close calls ixp_hangup
* on all of the connections on which the server is
* listening.
*/
void
ixp_hangup(IxpConn *c) {
IxpServer *s;
IxpConn **tc;
s = c->srv;
for(tc=&s->conn; *tc; tc=&(*tc)->next)
if(*tc == c) break;
assert(*tc == c);
*tc = c->next;
c->closed = 1;
if(c->close)
c->close(c);
else
shutdown(c->fd, SHUT_RDWR);
close(c->fd);
free(c);
}
void
ixp_server_close(IxpServer *s) {
IxpConn *c, *next;
for(c = s->conn; c; c = next) {
next = c->next;
ixp_hangup(c);
}
}
static void
prepare_select(IxpServer *s) {
IxpConn *c;
FD_ZERO(&s->rd);
for(c = s->conn; c; c = c->next)
if(c->read) {
if(s->maxfd < c->fd)
s->maxfd = c->fd;
FD_SET(c->fd, &s->rd);
}
}
static void
handle_conns(IxpServer *s) {
IxpConn *c, *n;
for(c = s->conn; c; c = n) {
n = c->next;
if(FD_ISSET(c->fd, &s->rd))
c->read(c);
}
}
/**
* Function: ixp_serverloop
*
* Enters the main loop of the server. Exits when
* P<s>->running becomes false, or when select(2) returns an
* error other than EINTR.
*
* S<IxpServer>
*
* Returns:
* Returns 0 when the loop exits normally, and 1 when
* it exits on error. V<errno> or the return value of
* ixp_errbuf(3) may be inspected.
*
*/
int
ixp_serverloop(IxpServer *s) {
timeval *tvp;
timeval tv;
long timeout;
int r;
s->running = 1;
thread->initmutex(&s->lk);
while(s->running) {
if(s->preselect)
s->preselect(s);
tvp = nil;
timeout = ixp_nexttimer(s);
if(timeout > 0) {
tv.tv_sec = timeout/1000;
tv.tv_usec = timeout%1000 * 1000;
tvp = &tv;
}
prepare_select(s);
r = thread->select(s->maxfd + 1, &s->rd, 0, 0, tvp);
if(r < 0) {
if(errno == EINTR)
continue;
return 1;
}
handle_conns(s);
}
return 0;
}
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