[PATCH 5.5 172/367] selftests: bpf: Use a temporary file in test_sockmap

Greg Kroah-Hartman
2020-02-10T13:02:21Z

From: Lorenz Bauer <lmb@cloudflare.com>

commit c31dbb1e41d1857b403f9bf58c87f5898519a0bc upstream.

Use a proper temporary file for sendpage tests. This means that running
the tests doesn't clutter the working directory, and allows running the
test on read-only filesystems.

Fixes: 16962b2404ac ("bpf: sockmap, add selftests")
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20200124112754.19664-2-lmb@cloudflare.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
tools/testing/selftests/bpf/test_sockmap.c | 15 +++++----------
1 file changed, 5 insertions(+), 10 deletions(-)

--- a/tools/testing/selftests/bpf/test_sockmap.c
+++ b/tools/testing/selftests/bpf/test_sockmap.c
@@ -331,7 +331,7 @@ static int msg_loop_sendpage(int fd, int
FILE *file;
int i, fp;

- file = fopen(".sendpage_tst.tmp", "w+");
+ file = tmpfile();
if (!file) {
perror("create file for sendpage");
return 1;
@@ -340,13 +340,8 @@ static int msg_loop_sendpage(int fd, int
fwrite(&k, sizeof(char), 1, file);
fflush(file);
fseek(file, 0, SEEK_SET);
- fclose(file);

- fp = open(".sendpage_tst.tmp", O_RDONLY);
- if (fp < 0) {
- perror("reopen file for sendpage");
- return 1;
- }
+ fp = fileno(file);

clock_gettime(CLOCK_MONOTONIC, &s->start);
for (i = 0; i < cnt; i++) {
@@ -354,11 +349,11 @@ static int msg_loop_sendpage(int fd, int

if (!drop && sent < 0) {
perror("send loop error");
- close(fp);
+ fclose(file);
return sent;
} else if (drop && sent >= 0) {
printf("sendpage loop error expected: %i\n", sent);
- close(fp);
+ fclose(file);
return -EIO;
}

@@ -366,7 +361,7 @@ static int msg_loop_sendpage(int fd, int
s->bytes_sent += sent;
}
clock_gettime(CLOCK_MONOTONIC, &s->end);
- close(fp);
+ fclose(file);
return 0;
}