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authorJosef Bacik <jbacik@fb.com>2017-12-11 19:36:49 +0300
committerAlexei Starovoitov <ast@kernel.org>2017-12-12 20:02:40 +0300
commit965de87e54b803223bff703ea6b2a76c056695ae (patch)
tree43f90acde38704b6831d3819ce0bffee092eade4 /samples/bpf/tracex7_user.c
parent9802d86585db91655c7d1929a4f6bbe0952ea88e (diff)
downloadlinux-965de87e54b803223bff703ea6b2a76c056695ae.tar.xz
samples/bpf: add a test for bpf_override_return
This adds a basic test for bpf_override_return to verify it works. We override the main function for mounting a btrfs fs so it'll return -ENOMEM and then make sure that trying to mount a btrfs fs will fail. Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'samples/bpf/tracex7_user.c')
-rw-r--r--samples/bpf/tracex7_user.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/samples/bpf/tracex7_user.c b/samples/bpf/tracex7_user.c
new file mode 100644
index 000000000000..8a52ac492e8b
--- /dev/null
+++ b/samples/bpf/tracex7_user.c
@@ -0,0 +1,28 @@
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <linux/bpf.h>
+#include <unistd.h>
+#include "libbpf.h"
+#include "bpf_load.h"
+
+int main(int argc, char **argv)
+{
+ FILE *f;
+ char filename[256];
+ char command[256];
+ int ret;
+
+ snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+
+ if (load_bpf_file(filename)) {
+ printf("%s", bpf_log_buf);
+ return 1;
+ }
+
+ snprintf(command, 256, "mount %s tmpmnt/", argv[1]);
+ f = popen(command, "r");
+ ret = pclose(f);
+
+ return ret ? 0 : 1;
+}