[PATCH bpf-next v3 01/14] selftests/bpf: helpers: Add append_tid()

["Bastien Curutchet (eBPF Foundation)" <bastien.curutchet@bootlin.com>]

Some tests can't be run in parallel because they use same namespace
names or veth names.

Create an helper that appends the thread ID to a given string. 8
characters are used for it (7 digits + '\0')

Signed-off-by: Bastien Curutchet (eBPF Foundation) <bastien.curutchet@bootlin.com>
---
 tools/testing/selftests/bpf/network_helpers.c | 11 +++++++++++
 tools/testing/selftests/bpf/network_helpers.h | 10 ++++++++++
 2 files changed, 21 insertions(+)

diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c
index 80844a5fb1feef2ff73c2f0293e52495803ab769..d2ff7521aaa696ed04d8f1308394b4c01c1c038b 100644
--- a/tools/testing/selftests/bpf/network_helpers.c
+++ b/tools/testing/selftests/bpf/network_helpers.c
@@ -446,6 +446,17 @@ char *ping_command(int family)
 	return "ping";
 }
 
+int append_tid(char *str, size_t offset)
+{
+	if (!str)
+		return -1;
+
+	sprintf(&str[offset], "%07d", gettid());
+	str[offset + 7] = '\0';
+
+	return 0;
+}
+
 int remove_netns(const char *name)
 {
 	char *cmd;
diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h
index ebec8a8d6f81e9d079a3b087127a37885c656856..b2451dd00594190e1dcb58498d70dd80c0e7c51c 100644
--- a/tools/testing/selftests/bpf/network_helpers.h
+++ b/tools/testing/selftests/bpf/network_helpers.h
@@ -98,6 +98,16 @@ int send_recv_data(int lfd, int fd, uint32_t total_bytes);
 int make_netns(const char *name);
 int remove_netns(const char *name);
 
+/**
+ * append_tid() - Append thread ID to the given string.
+ *
+ * /!\ the appended thread ID is 8 characters long
+ *     so the input string must be allocated accordingly
+ *
+ * Returns -1 if input is NULL, 0 otherwise
+ */
+int append_tid(char *str, size_t offset);
+
 static __u16 csum_fold(__u32 csum)
 {
 	csum = (csum & 0xffff) + (csum >> 16);

-- 
2.47.1