[PATCH bpf-next v4 01/14] selftests/bpf: helpers: Add append_tid()

[Bastien Curutchet (eBPF Foundation)]

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.curutc...@bootlin.com>
---
 tools/testing/selftests/bpf/network_helpers.c | 17 +++++++++++++++++
 tools/testing/selftests/bpf/network_helpers.h | 12 ++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/tools/testing/selftests/bpf/network_helpers.c 
b/tools/testing/selftests/bpf/network_helpers.c
index 
80844a5fb1feef2ff73c2f0293e52495803ab769..a4252e000428415a7a1eb906d857038facd91735
 100644
--- a/tools/testing/selftests/bpf/network_helpers.c
+++ b/tools/testing/selftests/bpf/network_helpers.c
@@ -446,6 +446,23 @@ char *ping_command(int family)
        return "ping";
 }
 
+int append_tid(char *str, size_t sz)
+{
+       size_t end;
+
+       if (!str)
+               return -1;
+
+       end = strlen(str);
+       if (end + 8 > sz)
+               return -1;
+
+       sprintf(&str[end], "%07d", gettid());
+       str[end + 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..9f6e05d886c544aa2db4be164a4acdeddd394aee
 100644
--- a/tools/testing/selftests/bpf/network_helpers.h
+++ b/tools/testing/selftests/bpf/network_helpers.h
@@ -98,6 +98,18 @@ 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.
+ *
+ * @str: string to extend
+ * @sz: string's size
+ *
+ * 8 characters are used to append the thread ID (7 digits + '\0')
+ *
+ * Returns -1 on errors, 0 otherwise
+ */
+int append_tid(char *str, size_t sz);
+
 static __u16 csum_fold(__u32 csum)
 {
        csum = (csum & 0xffff) + (csum >> 16);

-- 
2.48.1