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samples: posix: gettimeofday: incorporate libc time API tests

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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 <peter.bigot@nordicsemi.no>
This commit is contained in:
Peter Bigot 2020-04-28 09:35:59 -05:00 committed by Carles Cufí
parent 3cb353c09f
commit 1d026703c4
2 changed files with 11 additions and 6 deletions
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9
samples/posix/gettimeofday/README.rst
View file

@ -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
************

8
samples/posix/gettimeofday/src/main.c
View file

@ -16,6 +16,9 @@ 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);
@ -23,8 +26,9 @@ int main(void)
}
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);
}
}