#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <errno.h>

#include <sys/time.h>

#include "../internal/syscall.h"

#if VLIBC_LEVEL_GE(2)

/*
 * settimeofday: set the kernel clock, via SYS_settimeofday.
 *
 * Requires privilege (the unprivileged caller gets EPERM from the kernel).
 * The tz argument is honored only alongside tv; passing a timezone record
 * while tv is NULL would ask the kernel to update its timezone state alone,
 * a legacy use no caller needs, so it is refused up front with ENOTSUP (the
 * Linux spelling of the value musl reports here; <errno.h> carries it as
 * EOPNOTSUPP).
 */
int
settimeofday(const struct timeval *tv, const struct timezone *tz)
{
    if (tz != NULL && tv == NULL)
    {
        errno = EOPNOTSUPP;
        return -1;
    }
    return syscall_ret(__syscall2(SYS_settimeofday, (long)tv, (long)tz));
}

#endif /* VLIBC_LEVEL_GE(2) */