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Subject[PATCH v2 08/11] VSOCK: add vsock_get_local_cid() test utility
Date
This patch adds utility to get local CID, useful to
understand if we are in the host or guest.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
---
tools/testing/vsock/util.c | 17 +++++++++++++++++
tools/testing/vsock/util.h | 1 +
2 files changed, 18 insertions(+)

diff --git a/tools/testing/vsock/util.c b/tools/testing/vsock/util.c
index d46a6e079b96..41b94495ecb1 100644
--- a/tools/testing/vsock/util.c
+++ b/tools/testing/vsock/util.c
@@ -13,6 +13,7 @@
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
+#include <assert.h>

#include "timeout.h"
#include "control.h"
@@ -44,6 +45,22 @@ unsigned int parse_cid(const char *str)
return n;
}

+/* Get the local CID */
+unsigned int vsock_get_local_cid(int fd)
+{
+ struct sockaddr_vm svm;
+ socklen_t svm_len = sizeof(svm);
+
+ if (getsockname(fd, (struct sockaddr *) &svm, &svm_len)) {
+ perror("getsockname");
+ exit(EXIT_FAILURE);
+ }
+
+ assert(svm.svm_family == AF_VSOCK);
+
+ return svm.svm_cid;
+}
+
/* Connect to <cid, port> and return the file descriptor. */
int vsock_stream_connect(unsigned int cid, unsigned int port)
{
diff --git a/tools/testing/vsock/util.h b/tools/testing/vsock/util.h
index fe524d393d67..379e02ab59bb 100644
--- a/tools/testing/vsock/util.h
+++ b/tools/testing/vsock/util.h
@@ -36,6 +36,7 @@ unsigned int parse_cid(const char *str);
int vsock_stream_connect(unsigned int cid, unsigned int port);
int vsock_stream_accept(unsigned int cid, unsigned int port,
struct sockaddr_vm *clientaddrp);
+unsigned int vsock_get_local_cid(int fd);
void send_byte(int fd, int expected_ret);
void recv_byte(int fd, int expected_ret);
void run_tests(const struct test_case *test_cases,
--
2.20.1
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