3 /* rl_transport - RL specific functions for transport */
5 /* Authors: Martin Quinson */
6 /* Copyright (C) 2004 Martin Quinson. */
8 /* This program is free software; you can redistribute it and/or modify it
9 under the terms of the license (GNU LGPL) which comes with this package. */
12 #include <sys/time.h> /* struct timeval */
13 #include <sys/types.h>
14 #include <sys/socket.h>
16 #include "gras/Transport/transport_private.h"
17 GRAS_LOG_EXTERNAL_CATEGORY(transport);
18 GRAS_LOG_DEFAULT_CATEGORY(transport);
25 * Returns the next socket to service having a message awaiting.
27 * if timeout<0, we ought to implement the adaptative timeout (FIXME)
29 * if timeout=0, do not wait for new message, only handle the ones already there.
31 * if timeout>0 and no message there, wait at most that amount of time before giving up.
34 gras_trp_select(double timeout,
35 gras_socket_t **dst) {
38 gras_dynar_t *sockets= gras_socketset_get();
40 double wakeup = gras_os_time() + 1000000*timeout;
42 /* nextToService used to make sure socket with high number do not starve */
43 /* static int nextToService = 0; */
44 struct timeval tout, *p_tout;
46 int max_fds=0; /* first arg of select: number of existing sockets */
48 int ready; /* return of select: number of socket ready to be serviced */
50 gras_socket_t *sock_iter; /* iterating over all sockets */
51 int cursor; /* iterating over all sockets */
55 if (timeout > 0) { /* did we timeout already? */
57 if (now == -1 || now >= wakeup) {
58 done = 0; /* didn't find anything */
63 /* construct the set of socket to ear from */
65 gras_dynar_foreach(sockets,cursor,sock_iter) {
66 if (sock_iter->incoming) {
67 if (max_fds < sock_iter->sd)
68 max_fds = sock_iter->sd;
69 FD_SET(sock_iter->sd, &FDS);
71 DEBUG1("Not considering socket %d for select",sock_iter->sd);
75 /* we cannot have more than FD_SETSIZE sockets */
76 if (++max_fds > FD_SETSIZE) {
77 WARN0("too many open sockets.");
84 tout.tv_sec = (unsigned long)((wakeup - now)/1000000);
85 tout.tv_usec = (unsigned long)(wakeup - now) % 1000000;
87 } else if (timeout == 0) {
92 /* we just do one loop around */
95 /* no timeout: good luck! */
99 DEBUG1("Selecting over %d socket(s)", max_fds-1);
100 ready = select(max_fds, &FDS, NULL, NULL, p_tout);
103 case EINTR: /* a signal we don't care about occured. we don't care */
104 /* if we cared, we would have set an handler */
106 case EINVAL: /* invalid value */
107 RAISE3(system_error,"invalid select: nb fds: %d, timeout: %d.%d",
108 max_fds, (int)tout.tv_sec,(int) tout.tv_usec);
110 gras_assert0(0,"Malloc error during the select");
112 RAISE2(system_error,"Error during select: %s (%d)",
113 strerror(errno),errno);
116 } else if (ready == 0) {
117 continue; /* this was a timeout */
120 gras_dynar_foreach(sockets,cursor,sock_iter) {
121 if(!FD_ISSET(sock_iter->sd, &FDS)) { /* this socket is not ready */
125 /* Got a socket to serve */
128 if ( sock_iter->accepting
129 && sock_iter->plugin->socket_accept) {
130 /* not a socket but an ear. accept on it and serve next socket */
131 gras_socket_t *accepted;
133 TRY(sock_iter->plugin->socket_accept(sock_iter,&accepted));
134 accepted->raw = sock_iter->raw;
137 FIXME: this fails of files. quite logical
138 /* Make sure the socket is still alive by reading the first byte */
142 recvd = recv(sock_iter->sd, &lookahead, 1, MSG_PEEK);
144 WARN2("socket %d failed: %s", sock_iter->sd, strerror(errno));
145 /* done with this socket */
146 gras_socket_close(&sock_iter);
148 } else if (recvd == 0) {
149 /* Connection reset (=closed) by peer. */
150 DEBUG1("Connection %d reset by peer", sock_iter->sd);
151 gras_socket_close(&sock_iter);
155 /* Got a suited socket ! */
164 /* if we're here, the socket we found wasn't really ready to be served */
165 if (ready == 0) /* exausted all sockets given by select. Request new ones */
171 return timeout_error;
174 gras_error_t gras_trp_sg_setup(gras_trp_plugin_t *plug) {
175 return mismatch_error;