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authorQuentin Monnet <quentin.monnet@netronome.com>2017-11-29 04:44:30 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2017-11-30 04:09:29 +0300
commit146882a37da7aa566c7ec088b42c6495d769f2ba (patch)
treeb577401a7893ca642580f58e486c7015a7eac73f /tools
parent7868620a3c15dbc661fb5d849de403ac04624c50 (diff)
downloadlinux-146882a37da7aa566c7ec088b42c6495d769f2ba.tar.xz
tools: bpftool: make error message from getopt_long() JSON-friendly
If `getopt_long()` meets an unknown option, it prints its own error message to standard error output. While this does not strictly break JSON output, it is the only case bpftool prints something to standard error output if JSON output is required. All other errors are printed on standard output as JSON objects, so that an external program does not have to parse stderr. This is changed by setting the global variable `opterr` to 0. Furthermore, p_err() is used to reproduce the error message in a more JSON-friendly way, so that users still get to know what the erroneous option is. Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com> Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools')
-rw-r--r--tools/bpf/bpftool/main.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c
index d72dd73a4016..d294bc8168be 100644
--- a/tools/bpf/bpftool/main.c
+++ b/tools/bpf/bpftool/main.c
@@ -288,6 +288,7 @@ int main(int argc, char **argv)
hash_init(prog_table.table);
hash_init(map_table.table);
+ opterr = 0;
while ((opt = getopt_long(argc, argv, "Vhpjf",
options, NULL)) >= 0) {
switch (opt) {
@@ -313,7 +314,11 @@ int main(int argc, char **argv)
show_pinned = true;
break;
default:
- usage();
+ p_err("unrecognized option '%s'", argv[optind - 1]);
+ if (json_output)
+ clean_and_exit(-1);
+ else
+ usage();
}
}