USLEEP(3C) Standard C Library Functions USLEEP(3C)
- suspend execution for interval in microseconds
SYNOPSIS #include <unistd.h> int usleep
() function suspends the caller from execution for the number of
microseconds specified by the useconds
argument. The actual suspension
time might be less than requested because any caught signal will terminate usleep
() following execution of that signal's catching routine. The
suspension time might be longer than requested by an arbitrary amount
because of the scheduling of other activity in the system.
If the value of useconds
is 0, then the call has no effect.
The use of the usleep function has no effect on the action or blockage of
any signal. In a multithreaded process, only the invoking thread is
suspended from execution.
On completion, usleep
() returns 0. There are no error returns.
No errors are returned.
() function is included for its historical usage and is Obsolete.
function is preferred over this function.
INTERFACE STABILITY Obsolete Standard
SEE ALSO nanosleep(3C)
() function is available in the following compilation
environments. See standards(5)
X/Open Portability Guide Issue 4, Version 2 ("XPG4.2") +o
Version 2 of the Single UNIX Specification ("SUSv2") +o
Version 3 of the Single UNIX Specification ("SUSv3")
It is marked obsolete in Version 3 of the Single UNIX Specification
("SUSv3"), and was removed from IEEE Std 1003.1-2008 ("POSIX.1").
illumos August 16, 2014 illumos