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qwurx [shmem] ~> strace -e trace=nanosleep perl -e 'sleep 1'
nanosleep({1, 0}, 0x7ffe9dc8df90)       = 0
...
qwurx [shmem] ~> strace -e trace=select perl -e 'select $u,$u,$u, -3.1
+415926'
select(0, NULL, NULL, NULL, {0, 0})     = 0 (Timeout)
+++ exited with 0 +++

struct timeval
  {
    __time_t tv_sec;            /* Seconds.  */
    __suseconds_t tv_usec;      /* Microseconds.  */
  };