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#include <err.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
int main(int argc, char **argv)
{
double seconds;
struct timespec ts;
if (argc != 2) {
write(1, "usage: sleep seconds\n", 21);
return 0;
}
seconds = strtod(argv[1], NULL);
ts.tv_sec = (time_t)seconds;
ts.tv_nsec = (long)((seconds - (double)ts.tv_sec) * 1e9);
if (nanosleep(&ts, NULL) < 0)
err(1, "nanosleep");
return 0;
}
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