[RFC bpf-next 4/7] bpf: add libpcap feature test

[Alan Maguire <alan.maguire@oracle.com>]

this test will be used when deciding whether to add the pcap
support features in the following patch

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
---
 tools/build/Makefile.feature       |  2 ++
 tools/build/feature/Makefile       |  4 ++++
 tools/build/feature/test-libpcap.c | 26 ++++++++++++++++++++++++++
 3 files changed, 32 insertions(+)
 create mode 100644 tools/build/feature/test-libpcap.c

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 86b793d..35e65418 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -85,6 +85,7 @@ FEATURE_TESTS_EXTRA :=                  \
          libbfd-liberty                 \
          libbfd-liberty-z               \
          libopencsd                     \
+         libpcap                        \
          libunwind-x86                  \
          libunwind-x86_64               \
          libunwind-arm                  \
@@ -113,6 +114,7 @@ FEATURE_DISPLAY ?=              \
          libelf                 \
          libnuma                \
          numa_num_possible_cpus \
+         libpcap                \
          libperl                \
          libpython              \
          libcrypto              \
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index 0658b8c..c7585a1 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -27,6 +27,7 @@ FILES=                                          \
          test-libelf-mmap.bin                   \
          test-libnuma.bin                       \
          test-numa_num_possible_cpus.bin        \
+         test-libpcap.bin                       \
          test-libperl.bin                       \
          test-libpython.bin                     \
          test-libpython-version.bin             \
@@ -209,6 +210,9 @@ FLAGS_PERL_EMBED=$(PERL_EMBED_CCOPTS) $(PERL_EMBED_LDOPTS)
 $(OUTPUT)test-libperl.bin:
 	$(BUILD) $(FLAGS_PERL_EMBED)
 
+$(OUTPUT)test-libpcap.bin:
+	$(BUILD) -lpcap
+
 $(OUTPUT)test-libpython.bin:
 	$(BUILD) $(FLAGS_PYTHON_EMBED)
 
diff --git a/tools/build/feature/test-libpcap.c b/tools/build/feature/test-libpcap.c
new file mode 100644
index 0000000..7f60eb9
--- /dev/null
+++ b/tools/build/feature/test-libpcap.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <pcap.h>
+
+#define PKTLEN 100
+
+int main(void)
+{
+	char dummy_data[PKTLEN] = { 0 };
+	pcap_dumper_t *pcap_dumper;
+	struct pcap_pkthdr hdr;
+	int proto = 1;
+	pcap_t *pcap;
+
+	pcap = pcap_open_dead(proto, PKTLEN);
+	pcap_dumper = pcap_dump_open(pcap, "-");
+	hdr.caplen = PKTLEN;
+	hdr.len = PKTLEN;
+	hdr.ts.tv_sec = 0;
+	hdr.ts.tv_usec = 0;
+	pcap_dump((u_char *)pcap_dumper, &hdr, (const u_char *)dummy_data);
+	pcap_dump_flush(pcap_dumper);
+	pcap_dump_close(pcap_dumper);
+	pcap_close(pcap);
+
+	return 0;
+}
-- 
1.8.3.1