X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=dccp_send.c;h=3979982c725da1b6e83966b6ac6887cb2cfae2a6;hp=0657d11cbe00b55184fa2e612e2f5ffa24acbdae;hb=4ec04c614fc2e835a2d106ee61482ba0c729f5e6;hpb=e1a07bd50c0e0bc393abf89a342ce53e10ccf576

diff --git a/dccp_send.c b/dccp_send.c
index 0657d11c..3979982c 100644
--- a/dccp_send.c
+++ b/dccp_send.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2006-2010 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2013 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -13,7 +13,6 @@
 
 #include <regex.h>
 #include <sys/types.h>
-#include <dirent.h>
 #include <osl.h>
 
 #include "para.h"
@@ -25,6 +24,7 @@
 #include "net.h"
 #include "list.h"
 #include "send.h"
+#include "sched.h"
 #include "vss.h"
 #include "fd.h"
 #include "close_on_fork.h"
@@ -32,9 +32,6 @@
 #include "server.cmdline.h"
 #include "acl.h"
 
-/** Do not write more than that many bytes at once. */
-#define DCCP_MAX_BYTES_PER_WRITE 1024
-
 static struct sender_status dccp_sender_status, *dss = &dccp_sender_status;
 
 struct dccp_fec_client {
@@ -86,13 +83,31 @@ static void dccp_shutdown_clients(void)
 		dccp_shutdown_client(sc);
 }
 
-static int dccp_send_fec(struct sender_client *sc, char *buf, size_t len)
+/** * Obtain current MPS according to RFC 4340, sec. 14. */
+static int dccp_init_fec(struct sender_client *sc)
+{
+	int mps, ret;
+	socklen_t ml = sizeof(mps);
+
+	/* If call fails, return some sensible minimum value */
+	ret = getsockopt(sc->fd, SOL_DCCP, DCCP_SOCKOPT_GET_CUR_MPS, &mps, &ml);
+	if (ret < 0) {
+		PARA_NOTICE_LOG("can not determine MPS: %s\n", strerror(errno));
+		mps = generic_max_transport_msg_size(sc->fd) - DCCP_MAX_HEADER;
+	}
+	PARA_INFO_LOG("current MPS = %d bytes\n", mps);
+	assert(mps > 0);
+	if (conf.dccp_max_slice_size_arg > 0)
+		mps = PARA_MIN(mps, conf.dccp_max_slice_size_arg);
+	return mps;
+}
+
+static void dccp_send_fec(struct sender_client *sc, char *buf, size_t len)
 {
-	int ret = write_nonblock(sc->fd, buf, len, DCCP_MAX_BYTES_PER_WRITE);
+	int ret = xwrite(sc->fd, buf, len);
 
 	if (ret < 0)
 		dccp_shutdown_client(sc);
-	return ret;
 }
 
 static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds)
@@ -125,11 +140,11 @@ static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds)
 	}
 	dfc = para_calloc(sizeof(*dfc));
 	sc->private_data = dfc;
-	dfc->fcp.slices_per_group	= 4;
-	dfc->fcp.data_slices_per_group	= 3;
-	dfc->fcp.max_slice_bytes	= DCCP_MAX_BYTES_PER_WRITE; /* FIXME */
-	dfc->fcp.init_fec		= NULL; /* FIXME */
+	dfc->fcp.data_slices_per_group	= conf.dccp_data_slices_per_group_arg;
+	dfc->fcp.slices_per_group	= conf.dccp_slices_per_group_arg;
+	dfc->fcp.init_fec		= dccp_init_fec;
 	dfc->fcp.send_fec		= dccp_send_fec;
+	dfc->fcp.need_periodic_header   = false;
 	dfc->fc = vss_add_fec_client(sc, &dfc->fcp);
 }
 
@@ -140,6 +155,7 @@ static int dccp_com_on(__a_unused struct sender_command_data *scd)
 
 static int dccp_com_off(__a_unused struct sender_command_data *scd)
 {
+	dccp_shutdown_clients();
 	generic_com_off(dss);
 	return 1;
 }
@@ -197,13 +213,14 @@ static char *dccp_info(void)
  */
 void dccp_send_init(struct sender *s)
 {
-	int ret;
+	int ret, k, n;
 
 	s->info = dccp_info;
 	s->send = NULL;
 	s->pre_select = dccp_pre_select;
 	s->post_select = dccp_post_select;
 	s->shutdown_clients = dccp_shutdown_clients;
+	s->resolve_target = NULL;
 	s->help = generic_sender_help;
 	s->client_cmds[SENDER_ON] = dccp_com_on;
 	s->client_cmds[SENDER_OFF] = dccp_com_off;
@@ -212,6 +229,15 @@ void dccp_send_init(struct sender *s)
 	s->client_cmds[SENDER_ADD] = NULL;
 	s->client_cmds[SENDER_DELETE] = NULL;
 
+	k = conf.dccp_data_slices_per_group_arg;
+	n = conf.dccp_slices_per_group_arg;
+
+	if (k <= 0 || n <= 0 || k >= n) {
+		PARA_WARNING_LOG("invalid FEC parameters, using defaults\n");
+		conf.dccp_data_slices_per_group_arg = 3;
+		conf.dccp_slices_per_group_arg = 4;
+	}
+
 	init_sender_status(dss, conf.dccp_access_arg, conf.dccp_access_given,
 		conf.dccp_port_arg, conf.dccp_max_clients_arg,
 		conf.dccp_default_deny_given);