From: Francois-Xavier Le Bail <devel.fx.lebail@orange.fr>
Date: Wed, 25 Sep 2024 11:47:06 +0000 (+0200)
Subject: Add --time-t-size option to print the size of time_t in bits
X-Git-Url: https://git.tcpdump.org/tcpdump/commitdiff_plain/196c0c8d2646324c07c4841edae1150309aafc0f?ds=inline

Add --time-t-size option to print the size of time_t in bits

Have tests/TESTrun run "./tcpdump --time-t-size and set HAVE_TIME_T_64
key based on that.

This will permit to run tests based on time_t size (32-bit or 64-bit).

(backported from commit aacc29d06ccccd15b6b07bba0858e6fa32e97edd)
---

diff --git a/tcpdump.c b/tcpdump.c
index a4cdbe07..faabe0bf 100644
--- a/tcpdump.c
+++ b/tcpdump.c
@@ -701,6 +701,7 @@ show_remote_devices_and_exit(void)
 #define OPTION_TSTAMP_NANO		134
 #define OPTION_FP_TYPE			135
 #define OPTION_COUNT			136
+#define OPTION_TIME_T_SIZE		139
 
 static const struct option longopts[] = {
 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
@@ -748,6 +749,7 @@ static const struct option longopts[] = {
 	{ "fp-type", no_argument, NULL, OPTION_FP_TYPE },
 	{ "number", no_argument, NULL, '#' },
 	{ "print", no_argument, NULL, OPTION_PRINT },
+	{ "time-t-size", no_argument, NULL, OPTION_TIME_T_SIZE },
 	{ "version", no_argument, NULL, OPTION_VERSION },
 	{ NULL, 0, NULL, 0 }
 };
@@ -1914,6 +1916,10 @@ main(int argc, char **argv)
 			ndo->ndo_packet_number = 1;
 			break;
 
+		case OPTION_TIME_T_SIZE:
+			printf("%zu\n", sizeof(time_t) * 8);
+			return 0;
+
 		case OPTION_VERSION:
 			print_version(stdout);
 			exit_tcpdump(S_SUCCESS);
diff --git a/tests/TESTrun b/tests/TESTrun
index 0a1a255c..bf95e460 100755
--- a/tests/TESTrun
+++ b/tests/TESTrun
@@ -386,6 +386,17 @@ sub loadconfighash {
     printf "$TCPDUMP --fp-type => %s\n", $have_fptype;
     $main::confighhash->{$have_fptype} = 1;
 
+    # run tcpdump --time-t-size to get the size of size_t in bits
+    open(TIMETSIZE_PIPE, "$TCPDUMP --time-t-size |") or die("piping tcpdump --time-t-size failed\n");
+    my $time_t_size = <TIMETSIZE_PIPE>;
+    close(TIMETSIZE_PIPE);
+    my $have_time_t_64;
+    if($time_t_size == "64") {
+        $have_time_t_64 = "HAVE_TIME_T_64";
+    }
+    printf "$TCPDUMP --time-t-size => %s\n", $time_t_size;
+    $main::confighhash->{$have_time_t_64} = 1;
+
     # and check whether this is OpenBSD, as one test fails in OpenBSD
     # due to the sad hellscape of low-numbered DLT_ values, due to
     # 12 meaning "OpenBSD loopback" rather than "raw IP" on OpenBSD