4.4BSD/usr/share/man/cat3/sleep.0

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SLEEP(3)                    BSD Programmer's Manual                   SLEEP(3)

NNAAMMEE
     sslleeeepp - suspend process execution for interval of seconds

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<uunniissttdd..hh>>

     _u___i_n_t
     sslleeeepp(_u___i_n_t _s_e_c_o_n_d_s);

DDEESSCCRRIIPPTTIIOONN
     The sslleeeepp() function suspends execution of the calling process for
     _s_e_c_o_n_d_s of time.  System activity or time spent in processing the call
     may lengthen the sleep by a second.

     If a timer is already running on the process its state is saved.  If the
     value _s_e_c_o_n_d_s is more than or equal to the remaining clock time for the
     saved timer, the sleep time is set to the remaining clock time.  The
     state of the previous timer is restored after _s_e_c_o_n_d_s has passed.

     This function is implemented using setitimer(2);  it requires eight sys-
     tem calls each time it is invoked.  A similar but less compatible func-
     tion can be obtained with a single select(2);  such a function would not
     restart after signals, but would not interfere with other uses of
     setitimer.

RREETTUURRNN VVAALLUUEESS
SSEEEE AALLSSOO
     setitimer(2),  sigpause(2),  usleep(3)

HHIISSTTOORRYY
     A sslleeeepp() function appeared in Version 7 AT&T UNIX.

4.4BSD                           June 4, 1993                                1