[PATCH v5 2/6] eal: turn off getopt_long error message during eal_log_level

[Stephen Hemminger]

If DPDK application is given a bogus option, the error message
would get printed twice. Once during scan for log level and
again during parsing of arguments.

Example:
	# ./build/app/dpdk-testpmd --bogus
	./build/app/dpdk-testpmd: unrecognized option '--bogus'
	EAL: Detected CPU lcores: 16
	EAL: Detected NUMA nodes: 1
	./build/app/dpdk-testpmd: unrecognized option '--bogus'

	Usage: ./build/app/dpdk-testpmd [options]

Fix by suppressing printing error message on first pass.

Signed-off-by: Keith Wiles <keith.wiles at intel.com>
Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
---
 lib/eal/unix/eal_log.c | 3 +++
 lib/eal/windows/eal.c  | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/lib/eal/unix/eal_log.c b/lib/eal/unix/eal_log.c
index f8a5c853f2df..3f54284494d7 100644
--- a/lib/eal/unix/eal_log.c
+++ b/lib/eal/unix/eal_log.c
@@ -64,12 +64,14 @@ eal_log_level_parse(int argc, char *const argv[])
 	int option_index, opt;
 	const int old_optind = optind;
 	const int old_optopt = optopt;
+	const int old_opterr = opterr;
 	char * const old_optarg = optarg;
 #ifdef RTE_EXEC_ENV_FREEBSD
 	const int old_optrset = optreset;
 #endif
 
 	optind = 1;
+	opterr = 0;
 #ifdef RTE_EXEC_ENV_FREEBSD
 	optreset = 1;
 #endif
@@ -94,6 +96,7 @@ eal_log_level_parse(int argc, char *const argv[])
 	optind = old_optind;
 	optopt = old_optopt;
 	optarg = old_optarg;
+	opterr = old_opterr;
 #ifdef RTE_EXEC_ENV_FREEBSD
 	optreset = old_optreset;
 #endif
diff --git a/lib/eal/windows/eal.c b/lib/eal/windows/eal.c
index 2d7a0e9ab27e..0800a9e5c2d2 100644
--- a/lib/eal/windows/eal.c
+++ b/lib/eal/windows/eal.c
@@ -106,6 +106,8 @@ eal_log_level_parse(int argc, char **argv)
 	struct internal_config *internal_conf =
 		eal_get_internal_configuration();
 
+	opterr = 0;
+
 	argvopt = argv;
 
 	eal_reset_internal_config(internal_conf);
@@ -143,6 +145,7 @@ eal_parse_args(int argc, char **argv)
 		eal_get_internal_configuration();
 
 	argvopt = argv;
+	opterr = 1;
 
 	while ((opt = getopt_long(argc, argvopt, eal_short_options,
 		eal_long_options, &option_index)) != EOF) {
-- 
2.39.2