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authorJuhee Kang <claudiajkang@gmail.com>2021-07-27 04:10:55 +0000
committerAndrii Nakryiko <andrii@kernel.org>2021-07-27 11:15:09 -0700
commit7d07006f05922b95518be403f08ef8437b67aa32 (patch)
tree256a91c7b7c62829f0b7119a6d15c7deef1a9ead /samples
parent4cda0c82a34bce96a4e7f229e48a0a57f39acd1b (diff)
downloadlinux-7d07006f05922b95518be403f08ef8437b67aa32.tar.bz2
samples: bpf: Fix tracex7 error raised on the missing argument
The current behavior of 'tracex7' doesn't consist with other bpf samples tracex{1..6}. Other samples do not require any argument to run with, but tracex7 should be run with btrfs device argument. (it should be executed with test_override_return.sh) Currently, tracex7 doesn't have any description about how to run this program and raises an unexpected error. And this result might be confusing since users might not have a hunch about how to run this program. // Current behavior # ./tracex7 sh: 1: Syntax error: word unexpected (expecting ")") // Fixed behavior # ./tracex7 ERROR: Run with the btrfs device argument! In order to fix this error, this commit adds logic to report a message and exit when running this program with a missing argument. Additionally in test_override_return.sh, there is a problem with multiple directory(tmpmnt) creation. So in this commit adds a line with removing the directory with every execution. Signed-off-by: Juhee Kang <claudiajkang@gmail.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210727041056.23455-1-claudiajkang@gmail.com
Diffstat (limited to 'samples')
-rwxr-xr-xsamples/bpf/test_override_return.sh1
-rw-r--r--samples/bpf/tracex7_user.c5
2 files changed, 6 insertions, 0 deletions
diff --git a/samples/bpf/test_override_return.sh b/samples/bpf/test_override_return.sh
index e68b9ee6814b..35db26f736b9 100755
--- a/samples/bpf/test_override_return.sh
+++ b/samples/bpf/test_override_return.sh
@@ -1,5 +1,6 @@
#!/bin/bash
+rm -r tmpmnt
rm -f testfile.img
dd if=/dev/zero of=testfile.img bs=1M seek=1000 count=1
DEVICE=$(losetup --show -f testfile.img)
diff --git a/samples/bpf/tracex7_user.c b/samples/bpf/tracex7_user.c
index fdcd6580dd73..8be7ce18d3ba 100644
--- a/samples/bpf/tracex7_user.c
+++ b/samples/bpf/tracex7_user.c
@@ -14,6 +14,11 @@ int main(int argc, char **argv)
int ret = 0;
FILE *f;
+ if (!argv[1]) {
+ fprintf(stderr, "ERROR: Run with the btrfs device argument!\n");
+ return 0;
+ }
+
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
obj = bpf_object__open_file(filename, NULL);
if (libbpf_get_error(obj)) {