librt, libposix4 - POSIX.1b Realtime Extensions library

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如下这些函数依赖rt库，即通过-lrt编译链接动态库。

aio_cancel aio_error

aio_fsync aio_read
aio_return aio_suspend
aio_waitn aio_write
clock_getres clock_gettime
clock_settime close
fdatasync fork
lio_listio mq_close
mq_getattr mq_notify
mq_open mq_receive
mq_send mq_setattr
mq_unlink nanosleep
sched_get_priority_max sched_get_priority_min
sched_getparam sched_getscheduler
sched_rr_get_interval sched_setparam
sched_setscheduler sched_yield
sem_close sem_destroy
sem_getvalue sem_init
sem_open sem_post
sem_trywait sem_unlink
sem_wait shm_open
shm_unlink sigqueue
sigtimedwait sigwaitinfo
timer_create timer_delete
timer_getoverrun timer_gettime
timer_settime

The following interfaces are unique to the 32-bit version of
this library:

aio_cancel64 aio_error64
aio_fsync64 aio_read64
aio_return64 aio_suspend64
aio_write64 lio_listio64