trace-cmd: Add debug prints for network connections

To help debug the network agent and listener, add some debug prints that
are enabled when --debug option is used.

Link: https://lore.kernel.org/linux-trace-devel/20220420152637.13105-7-rostedt@goodmis.org
Link: https://lore.kernel.org/linux-trace-devel/20220417184538.1044417-7-rostedt@goodmis.org

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

4 files changed, 18 insertions, 0 deletions

diff --git a/lib/trace-cmd/trace-timesync.c b/lib/trace-cmd/trace-timesync.c
index 14cf20c8..cc44af38 100644
--- a/lib/trace-cmd/trace-timesync.c
+++ b/lib/trace-cmd/trace-timesync.c
@@ -925,7 +925,9 @@ static void *tsync_agent_thread(void *data)
 	int sd;
 
 	while (true) {
+		tracecmd_debug("Listening on fd:%d\n", tsync->msg_handle->fd);
 		sd = accept(tsync->msg_handle->fd, NULL, NULL);
+		tracecmd_debug("Accepted fd:%d\n", sd);
 		if (sd < 0) {
 			if (errno == EINTR)
 				continue;
diff --git a/tracecmd/trace-agent.c b/tracecmd/trace-agent.c
index cd201ad9..819ac016 100644
--- a/tracecmd/trace-agent.c
+++ b/tracecmd/trace-agent.c
@@ -22,6 +22,8 @@
 #include "trace-local.h"
 #include "trace-msg.h"
 
+#define dprint(fmt, ...)	tracecmd_debug(fmt, ##__VA_ARGS__)
+
 static void make_vsocks(int nr, int *fds, unsigned int *ports)
 {
 	unsigned int port;
@@ -55,6 +57,7 @@ static void make_net(int nr, int *fds, unsigned int *ports)
 			die("Failed to listen on port %d\n", port);
 		fds[i] = fd;
 		ports[i] = port;
+		dprint("CPU[%d]: fd:%d port:%d\n", i, fd, port);
 		start_port = port + 1;
 	}
 }
diff --git a/tracecmd/trace-listen.c b/tracecmd/trace-listen.c
index 8476fa51..3b446ace 100644
--- a/tracecmd/trace-listen.c
+++ b/tracecmd/trace-listen.c
@@ -26,6 +26,8 @@
 #include "trace-local.h"
 #include "trace-msg.h"
 
+#define dprint(fmt, ...)	tracecmd_debug(fmt, ##__VA_ARGS__)
+
 #define MAX_OPTION_SIZE 4096
 
 #define _VAR_DIR_Q(dir)		#dir
@@ -279,6 +281,8 @@ int trace_net_make(int port, enum port_type type)
 	if (rp == NULL)
 		return -1;
 
+	dprint("Create listen port: %d fd:%d\n", port, sd);
+
 	return sd;
 }
 
diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c
index dfcf3d49..9c930920 100644
--- a/tracecmd/trace-record.c
+++ b/tracecmd/trace-record.c
@@ -56,6 +56,8 @@
 #define FUNC_STACK_TRACE "func_stack_trace"
 #define TSC_CLOCK	"x86-tsc"
 
+#define dprint(fmt, ...)	tracecmd_debug(fmt, ##__VA_ARGS__)
+
 enum trace_type {
 	TRACE_TYPE_RECORD	= 1,
 	TRACE_TYPE_START	= (1 << 1),
@@ -3139,6 +3141,9 @@ static struct addrinfo *do_getaddrinfo(const char *host, unsigned int port,
 		return NULL;
 	}
 
+	dprint("Attached port %s: %d to results: %p\n",
+	       type == USE_TCP ? "TCP" : "UDP", port, results);
+
 	return results;
 }
 
@@ -3160,6 +3165,8 @@ static int connect_addr(struct addrinfo *results)
 	if (rp == NULL)
 		return -1;
 
+	dprint("connect results: %p with fd: %d\n", results, sfd);
+
 	return sfd;
 }
 
@@ -3193,7 +3200,9 @@ static int do_accept(int sd)
 	int cd;
 
 	for (;;) {
+		dprint("Wait on accept: %d\n", sd);
 		cd = accept(sd, NULL, NULL);
+		dprint("accepted: %d\n", cd);
 		if (cd < 0) {
 			if (errno == EINTR)
 				continue;