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| author | Juhee Kang <claudiajkang@gmail.com> | 2021-07-27 07:10:55 +0300 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2021-07-27 21:15:09 +0300 |
| commit | 7d07006f05922b95518be403f08ef8437b67aa32 (patch) | |
| tree | 256a91c7b7c62829f0b7119a6d15c7deef1a9ead /samples | |
| parent | 4cda0c82a34bce96a4e7f229e48a0a57f39acd1b (diff) | |
| download | linux-7d07006f05922b95518be403f08ef8437b67aa32.tar.xz | |
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-x | samples/bpf/test_override_return.sh | 1 | ||||
| -rw-r--r-- | samples/bpf/tracex7_user.c | 5 |
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)) { |