4 files changed, 170 insertions, 0 deletions
diff --git a/schulung_tools/ipc_tcp/Makefile b/schulung_tools/ipc_tcp/Makefile
new file mode 100644
index 0000000..be9a747
--- /dev/null
+++ b/schulung_tools/ipc_tcp/Makefile
@@ -0,0 +1,25 @@
+CC = $(CROSS_COMPILE)gcc
+CFLAGS = -Wall -Werror -g -O0 -std=c99 -D_GNU_SOURCE
+LDFLAGS = 
+CFLAGS += \
+	-Wchar-subscripts \
+	-Wmissing-declarations \
+	-Wmissing-prototypes \
+	-Wnested-externs \
+	-Wpointer-arith \
+	-Wcast-align \
+	-Wfloat-equal \
+	-Wsign-compare
+
+all: recv send
+
+recv: recv.c
+	$(CC) $(CFLAGS) $(LDFLAGS) -o$@ $<
+
+send: send.c
+	$(CC) $(CFLAGS) $(LDFLAGS) -o$@ $<
+
+clean:
+	rm -f send recv
+
+.PHONY: clean all
diff --git a/schulung_tools/ipc_tcp/README b/schulung_tools/ipc_tcp/README
new file mode 100644
index 0000000..71222dd
--- /dev/null
+++ b/schulung_tools/ipc_tcp/README
@@ -0,0 +1,25 @@
+#!/bin/sh
+
+# build programs send/recv
+make
+
+# create uprobe events
+sudo perf probe -x ./send sending=send.c:37
+sudo perf probe -x ./recv received=recv.c:62
+
+# run receiver
+sudo taskset 1 chrt -f 80 ./recv &
+
+# run sender (wrapping with trace-cmd)
+sudo trace-cmd record \
+	-e sched:sched_switch \
+	-e sched:sched_wakeup \
+	-e sched:sched_pi_setprio \
+	-e probe_send:sending \
+	-e probe_recv:received \
+	-e syscalls \
+	taskset 1 chrt -f 70 ./send
+# type message and hit return
+
+# view results
+kernelshark
diff --git a/schulung_tools/ipc_tcp/recv.c b/schulung_tools/ipc_tcp/recv.c
new file mode 100644
index 0000000..bd76f20
--- /dev/null
+++ b/schulung_tools/ipc_tcp/recv.c
@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+static char buffer[1024 * 1024];
+
+int main(void)
+{
+	struct sockaddr_in sa;
+	size_t count = 0;
+	int listen_s;
+	size_t size;
+	int rv;
+	int s;
+
+	listen_s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+	if (listen_s < 0)
+		return 1;
+	memset(&sa, 0, sizeof(sa));
+	sa.sin_family = AF_INET;
+	sa.sin_addr.s_addr = inet_addr("127.0.0.1");
+	sa.sin_port = htons(8806);
+
+	rv = 1;
+	if (setsockopt(listen_s, SOL_SOCKET, SO_REUSEADDR,
+		       (void *)&rv, sizeof(rv)) < 0) {
+                return 1;
+	}
+
+	if (bind(listen_s, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
+		fprintf(stderr, "bind() failed: %s\n", strerror(errno));
+		return 1;
+	}
+
+	if (listen(listen_s, 1) != 0)
+		return 1;
+
+	s = accept(listen_s, NULL, NULL);
+	if (s < 0)
+		return 1;
+
+	if (read(s, &size, sizeof(size)) != sizeof(size))
+		return 1;
+
+	if (size >= sizeof(buffer))
+		size = sizeof(buffer) - 1;
+
+	while (count < size) {
+		rv = read(s, buffer + count, size - count);
+		if (rv <= 0)
+			return 1;
+		count += rv;
+	}
+
+	/* set "received" uprobe here */
+
+	printf("recv (%d): received message: %s\n", getpid(), buffer);
+
+	close(s);
+	close(listen_s);
+
+	return 0;
+}
diff --git a/schulung_tools/ipc_tcp/send.c b/schulung_tools/ipc_tcp/send.c
new file mode 100644
index 0000000..60d2f1f
--- /dev/null
+++ b/schulung_tools/ipc_tcp/send.c
@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+static char buffer[1024 * 1024];
+
+int main(void)
+{
+	struct sockaddr_in sa;
+	size_t count = 0;
+	size_t size;
+	int rv;
+	int s;
+
+	s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+	if (s < 0)
+		return 1;
+	memset(&sa, 0, sizeof(sa));
+	sa.sin_family = AF_INET;
+	sa.sin_addr.s_addr = inet_addr("127.0.0.1");
+	sa.sin_port = htons(8806);
+
+	if (connect(s, (struct sockaddr *)&sa, sizeof(struct sockaddr)) != 0)
+		return 1;
+
+	printf("send (%d): type message and hit RETURN to send signal\n",
+	       getpid());
+	fgets(buffer, sizeof(buffer), stdin);
+
+	/* set "sending" uprobe here */
+
+	size = strlen(buffer);
+
+	if (write(s, &size, sizeof(size)) != sizeof(size))
+		return 1;
+
+	while (count < size) {
+		rv = write(s, buffer + count, size - count);
+		if (rv <= 0)
+			return 1;
+		count += rv;
+	}
+
+	sleep(1);
+
+	return 0;
+}