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Implement clock_gettime syscall #495

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merged 1 commit into from
Jun 27, 2022
Merged

Implement clock_gettime syscall #495

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63 changes: 62 additions & 1 deletion libctru/source/system/syscalls.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3,12 +3,15 @@
#include <sys/lock.h>
#include <sys/reent.h>
#include <string.h>
#include <time.h>
#include <errno.h>

#include <3ds/types.h>
#include <3ds/svc.h>
#include <3ds/env.h>
#include <3ds/os.h>
#include <3ds/synchronization.h>

#include "../internal.h"

void __ctru_exit(int rc);
Expand All @@ -28,6 +31,64 @@ struct _reent* __SYSCALL(getreent)()
return tv->reent;
}

int __SYSCALL(clock_gettime)(clockid_t clock_id, struct timespec *tp) {

if (clock_id == CLOCK_REALTIME)
{
if (tp != NULL)
{
// Retrieve current time, adjusting epoch from 1900 to 1970
s64 ms_since_epoch = osGetTime() - 2208988800000ULL;
tp->tv_sec = ms_since_epoch / 1000;
tp->tv_nsec = (ms_since_epoch % 1000) * 1000000;
}
}
else if (clock_id == CLOCK_MONOTONIC)
{
if (tp != NULL)
{
// Use the ticks directly, as it offer the highest precision
u64 ticks_since_boot = svcGetSystemTick();

tp->tv_sec = ticks_since_boot / SYSCLOCK_ARM11;
tp->tv_nsec = ((ticks_since_boot % SYSCLOCK_ARM11) * 1000000000ULL) / SYSCLOCK_ARM11;
}
}
else
{
errno = EINVAL;
return -1;
}

return 0;
}

int __SYSCALL(clock_getres)(clockid_t clock_id, struct timespec *res) {
if (clock_id == CLOCK_REALTIME)
{
if (res != NULL)
{
res->tv_sec = 0;
res->tv_nsec = 1000000;
}
}
else if (clock_id == CLOCK_MONOTONIC)
{
if (res != NULL)
{
res->tv_sec = 0;
res->tv_nsec = 1;
}
}
else
{
errno = EINVAL;
return -1;
}

return 0;
}

//---------------------------------------------------------------------------------
int __SYSCALL(gettod_r)(struct _reent *ptr, struct timeval *tp, struct timezone *tz) {
//---------------------------------------------------------------------------------
Expand All @@ -37,7 +98,7 @@ int __SYSCALL(gettod_r)(struct _reent *ptr, struct timeval *tp, struct timezone

// Convert to struct timeval
tp->tv_sec = now / 1000;
tp->tv_usec = (now - 1000*tp->tv_sec) * 1000;
tp->tv_usec = (now % 1000) * 1000;
}

if (tz != NULL) {
Expand Down