samples: posix: gettimeofday: incorporate libc time API tests

Use time(), localtime_r(), and asctime() to confirm that the declarations required for these (newlib) libc functions are made available in CONFIG_POSIX context. Signed-off-by: Peter Bigot <[email protected]>
zephyrproject-rtos · Sep 4, 2020 · 1d02670 · 1d02670
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diff --git a/samples/posix/gettimeofday/README.rst b/samples/posix/gettimeofday/README.rst
@@ -7,10 +7,11 @@ Overview
 ********
 
 This sample application demonstrates using the POSIX gettimeofday()
-function to display the absolute wall clock time every second. At
-system startup, the current time is queried using the SNTP networking
-protocol, enabled by setting the :option:`CONFIG_NET_CONFIG_CLOCK_SNTP_INIT`
-and :option:`CONFIG_NET_CONFIG_SNTP_INIT_SERVER` options.
+function to display the absolute wall clock time and local time every
+second. At system startup, the current time is queried using the SNTP
+networking protocol, enabled by setting the
+:option:`CONFIG_NET_CONFIG_CLOCK_SNTP_INIT` and
+:option:`CONFIG_NET_CONFIG_SNTP_INIT_SERVER` options.
 
 Requirements
 ************

diff --git a/samples/posix/gettimeofday/src/main.c b/samples/posix/gettimeofday/src/main.c
@@ -16,15 +16,19 @@ int main(void)
 
 	while (1) {
 		int res = gettimeofday(&tv, NULL);
+		time_t now = time(NULL);
+		struct tm tm;
+		localtime_r(&now, &tm);
 
 		if (res < 0) {
 			printf("Error in gettimeofday(): %d\n", errno);
 			return 1;
 		}
 
 		printf("gettimeofday(): HI(tv_sec)=%d, LO(tv_sec)=%d, "
-		       "tv_usec=%d\n", (unsigned int)(tv.tv_sec >> 32),
-		       (unsigned int)tv.tv_sec, (unsigned int)tv.tv_usec);
+		       "tv_usec=%d\n\t%s\n", (unsigned int)(tv.tv_sec >> 32),
+		       (unsigned int)tv.tv_sec, (unsigned int)tv.tv_usec,
+		       asctime(&tm));
 		sleep(1);
 	}
 }