third_party/ulib/musl/src/internal/time_conversion.h

#pragma once

#define __NEED_struct_timespec

#include "threads_impl.h"

#include <bits/alltypes.h>
#include <zircon/types.h>

static inline zx_time_t __duration_timespec_to_deadline(const struct timespec timespec) {
    // TODO(kulakowski) Systematic time overflow checking.
    zx_time_t nanos = timespec.tv_nsec;
    nanos += timespec.tv_sec * 1000000000ull;
    return _zx_deadline_after(nanos);
}

static inline int __timespec_to_deadline(const struct timespec* timespec,
                                         clockid_t clk, zx_time_t* deadline) {
    struct timespec to;

    if (timespec->tv_nsec >= ZX_SEC(1))
        return EINVAL;
    if (__clock_gettime(clk, &to))
        return EINVAL;
    to.tv_sec = timespec->tv_sec - to.tv_sec;
    if ((to.tv_nsec = timespec->tv_nsec - to.tv_nsec) < 0) {
        to.tv_sec--;
        to.tv_nsec += ZX_SEC(1);
    }
    if (to.tv_sec < 0)
        return ETIMEDOUT;
    *deadline = __duration_timespec_to_deadline(to);
    return 0;
}