r4706 - trunk/src/target/debug/input

[laforge at docs.openmoko.org]

Author: laforge
Date: 2008-10-09 12:32:38 +0200 (Thu, 09 Oct 2008)
New Revision: 4706

Added:
   trunk/src/target/debug/input/input-stat.c
Log:
add input event rate statistics program


Added: trunk/src/target/debug/input/input-stat.c
===================================================================
--- trunk/src/target/debug/input/input-stat.c	                        (rev 0)
+++ trunk/src/target/debug/input/input-stat.c	2008-10-09 10:32:38 UTC (rev 4706)
@@ -0,0 +1,105 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/fcntl.h>
+
+#include <linux/input.h>
+
+#define READBUF_SIZE (1024*sizeof(struct input_event))
+
+struct stats {
+	unsigned int num_reads;
+	unsigned int num_events;
+	struct timeval tv_first;
+	struct timeval tv_last;
+};
+
+static struct stats st;
+static char *filename;
+
+static int handle_event(struct input_event *evt)
+{
+	if (st.num_events == 1)
+		memcpy(&st.tv_first, &evt->time, sizeof(st.tv_first));
+
+	memcpy(&st.tv_last, &evt->time, sizeof(st.tv_last));
+
+	return 0;
+}
+
+static void time_difference(const struct timeval *start,
+			    struct timeval *end,
+			    struct timeval *result)
+{
+	if (end->tv_usec < start->tv_usec) {
+		end->tv_usec += 1000000;
+		end->tv_sec -= 1;
+	}
+
+	result->tv_usec = end->tv_usec - start->tv_usec;
+	result->tv_sec = end->tv_sec - start->tv_sec;
+}
+
+static void print_stats(void)
+{
+	struct timeval tv;
+
+	time_difference(&st.tv_first, &st.tv_last, &tv);
+
+	printf("input statiststics for device %s:\n", filename);
+	printf("\t%u reads, %u events in %u.%u seconds\n",
+		st.num_reads, st.num_events, tv.tv_sec, tv.tv_usec);
+	printf("\t%u events/read, %u events/second\n",
+		st.num_events / st.num_reads,
+		st.num_events / tv.tv_sec);
+}
+
+void sighand(int signal)
+{
+	fprintf(stderr, "received signal %d\n", signal);
+	print_stats();
+	exit(0);
+}
+
+int main(int argc, char **argv)
+{
+	int fd;
+	char buf[READBUF_SIZE];
+
+	if (argc < 2)
+		exit(2);
+
+	filename = argv[1];
+
+	fd = open(filename, O_RDONLY);
+	if (fd < 0) {
+		perror("open");
+		exit(1);
+	}
+
+	signal(SIGHUP, &sighand);
+	signal(SIGINT, &sighand);
+	signal(SIGTERM, &sighand);
+
+	while (1) {
+		int rc, i;
+		struct input_event *evt;
+
+		rc = read(fd, buf, sizeof(buf));
+		if (rc < 0) {
+			perror("read");
+			break;
+		}
+		st.num_reads++;
+
+		for (i = 0; i < rc; i += sizeof(struct input_event)) {
+			evt = (struct input_event *) (buf + i);
+			st.num_events++;
+			handle_event(evt);
+		}
+	}
+}