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-rw-r--r--Documentation/connector/ucon.c62
1 files changed, 53 insertions, 9 deletions
diff --git a/Documentation/connector/ucon.c b/Documentation/connector/ucon.c
index d738cde2a8d..a8e4d5885ad 100644
--- a/Documentation/connector/ucon.c
+++ b/Documentation/connector/ucon.c
@@ -30,18 +30,24 @@
#include <arpa/inet.h>
+#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <time.h>
+#include <getopt.h>
#include <linux/connector.h>
#define DEBUG
#define NETLINK_CONNECTOR 11
+/* Hopefully your userspace connector.h matches this kernel */
+#define CN_TEST_IDX CN_NETLINK_USERS + 3
+#define CN_TEST_VAL 0x456
+
#ifdef DEBUG
#define ulog(f, a...) fprintf(stdout, f, ##a)
#else
@@ -83,6 +89,25 @@ static int netlink_send(int s, struct cn_msg *msg)
return err;
}
+static void usage(void)
+{
+ printf(
+ "Usage: ucon [options] [output file]\n"
+ "\n"
+ "\t-h\tthis help screen\n"
+ "\t-s\tsend buffers to the test module\n"
+ "\n"
+ "The default behavior of ucon is to subscribe to the test module\n"
+ "and wait for state messages. Any ones received are dumped to the\n"
+ "specified output file (or stdout). The test module is assumed to\n"
+ "have an id of {%u.%u}\n"
+ "\n"
+ "If you get no output, then verify the cn_test module id matches\n"
+ "the expected id above.\n"
+ , CN_TEST_IDX, CN_TEST_VAL
+ );
+}
+
int main(int argc, char *argv[])
{
int s;
@@ -94,17 +119,34 @@ int main(int argc, char *argv[])
FILE *out;
time_t tm;
struct pollfd pfd;
+ bool send_msgs = false;
- if (argc < 2)
- out = stdout;
- else {
- out = fopen(argv[1], "a+");
+ while ((s = getopt(argc, argv, "hs")) != -1) {
+ switch (s) {
+ case 's':
+ send_msgs = true;
+ break;
+
+ case 'h':
+ usage();
+ return 0;
+
+ default:
+ /* getopt() outputs an error for us */
+ usage();
+ return 1;
+ }
+ }
+
+ if (argc != optind) {
+ out = fopen(argv[optind], "a+");
if (!out) {
ulog("Unable to open %s for writing: %s\n",
argv[1], strerror(errno));
out = stdout;
}
- }
+ } else
+ out = stdout;
memset(buf, 0, sizeof(buf));
@@ -115,9 +157,11 @@ int main(int argc, char *argv[])
}
l_local.nl_family = AF_NETLINK;
- l_local.nl_groups = 0x123; /* bitmask of requested groups */
+ l_local.nl_groups = -1; /* bitmask of requested groups */
l_local.nl_pid = 0;
+ ulog("subscribing to %u.%u\n", CN_TEST_IDX, CN_TEST_VAL);
+
if (bind(s, (struct sockaddr *)&l_local, sizeof(struct sockaddr_nl)) == -1) {
perror("bind");
close(s);
@@ -130,15 +174,15 @@ int main(int argc, char *argv[])
setsockopt(s, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &on, sizeof(on));
}
#endif
- if (0) {
+ if (send_msgs) {
int i, j;
memset(buf, 0, sizeof(buf));
data = (struct cn_msg *)buf;
- data->id.idx = 0x123;
- data->id.val = 0x456;
+ data->id.idx = CN_TEST_IDX;
+ data->id.val = CN_TEST_VAL;
data->seq = seq++;
data->ack = 0;
data->len = 0;