Posix_time2SourceHigh-level API to <time.h> and <sys/time.h>. See: time.h and systime.h for an explanation about the data structures and functions.
val select :
Unix.file_descr list ->
Unix.file_descr list ->
Unix.file_descr list ->
Timeval.t option ->
Unix.file_descr list * Unix.file_descr list * Unix.file_descr list