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1162f84403
linux/tools/bpf/bpftool
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Hechao Li 1162f84403 bpf: Print error message for bpftool cgroup show 
Currently, when bpftool cgroup show <path> has an error, no error
message is printed. This is confusing because the user may think the
result is empty.

Before the change:

$ bpftool cgroup show /sys/fs/cgroup
ID       AttachType      AttachFlags     Name
$ echo $?
255

After the change:
$ ./bpftool cgroup show /sys/fs/cgroup
Error: can't query bpf programs attached to /sys/fs/cgroup: Operation
not permitted

v2: Rename check_query_cgroup_progs to cgroup_has_attached_progs

Signed-off-by: Hechao Li <hechaol@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191224011742.3714301-1-hechaol@fb.com
2019-12-26 10:35:54 +01:00
..
bash-completion bpftool: Add gen skeleton BASH completions 2019-12-15 15:58:06 -08:00
Documentation bpftool: Work-around rst2man conversion bug 2019-12-18 17:03:52 -08:00
.gitignore tools: bpf: account for generated feature/ and libbpf/ directories 2019-08-31 00:38:16 +02:00
btf_dumper.c tools: bpftool: fix format strings and arguments for jsonw_printf() 2019-08-15 22:06:46 -07:00
btf.c tools, bpftool: Fix warning on ignored return value for 'read' 2019-11-24 16:58:44 -08:00
cfg.c tools: bpftool: teach cfg code about JMP32 2019-01-26 13:33:01 -08:00
cfg.h tools: bpftool: replace Netronome boilerplate with SPDX license headers 2018-12-13 12:08:44 +01:00
cgroup.c bpf: Print error message for bpftool cgroup show 2019-12-26 10:35:54 +01:00
common.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2019-09-06 16:49:17 +02:00
feature.c tools: bpftool: fix reading from /proc/config.gz 2019-08-12 11:07:16 +02:00
gen.c libbpf: Put Kconfig externs into .kconfig section 2019-12-18 17:33:36 -08:00
jit_disasm.c tools: bpftool: Fix json dump crash on powerpc 2019-07-05 23:50:38 +02:00
json_writer.c tools: bpftool: move "__printf()" attributes to header file 2019-08-15 22:06:46 -07:00
json_writer.h tools: bpftool: move "__printf()" attributes to header file 2019-08-15 22:06:46 -07:00
main.c bpftool: Add skeleton codegen command 2019-12-15 15:58:05 -08:00
main.h bpftool: Add skeleton codegen command 2019-12-15 15:58:05 -08:00
Makefile tools: bpftool: do not link twice against libbpf.a in Makefile 2019-08-31 00:38:16 +02:00
map_perf_ring.c tools: bpftool: fix arguments for p_err() in do_event_pipe() 2019-08-15 22:06:46 -07:00
map.c bpftool: Match maps by name 2019-12-15 09:03:18 -08:00
net.c libbpf: Move non-public APIs from libbpf.h to libbpf_internal.h 2019-12-15 15:58:04 -08:00
netlink_dumper.c tools: bpftool: dual license all files 2018-12-13 12:08:44 +01:00
netlink_dumper.h tools: bpftool: dual license all files 2018-12-13 12:08:44 +01:00
perf.c tools: bpftool: compile with $(EXTRA_WARNINGS) 2019-08-14 22:57:36 +02:00
prog.c bpftool: Match programs by name 2019-12-15 09:03:18 -08:00
tracelog.c tools: bpftool: add an option to prevent auto-mount of bpffs, tracefs 2018-12-18 14:47:17 +01:00
xlated_dumper.c bpf: style fix in while(!feof()) loop 2019-05-28 10:54:01 +02:00
xlated_dumper.h tools: bpftool: replace Netronome boilerplate with SPDX license headers 2018-12-13 12:08:44 +01:00