usleep(3) - NetBSD Manual Pages

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USLEEP(3)                 NetBSD Programmer's Manual                 USLEEP(3)


NAME

     usleep - suspend execution for interval of microseconds


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <unistd.h>

     int
     usleep(useconds_t microseconds);


DESCRIPTION

     The usleep() function suspends execution of the calling process until ei-
     ther the number of microseconds specified by microseconds have elapsed or
     a signal is delivered to the calling process and its action is to invoke
     a signal catching function or to terminate the process.  The suspension
     time may be longer than requested due to the scheduling of other activity
     by the system.

     The microseconds argument must be less than 1,000,000.  If the value of
     microseconds is 0, then the call has no effect.


RETURN VALUES

     On successful completition, usleep() returns 0.  Otherwhise, it returns
     -1 and sets errno to indicate the error.


ERRORS

     The usleep() function may fail if:

     [EINVAL]      The microseconds interval specified 1,000,000 or more mi-
                   croseconds.


SEE ALSO

     nanosleep(2), sleep(3)


STANDARDS

     The usleep() function conforms to X/Open Portability Guide Issue 4,
     Version 2 (``XPG4.2'').


HISTORY

     The usleep() function appeared in 4.3BSD.

NetBSD 1.6                       June 4, 1993                                1