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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "USLEEP" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" usleep 
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.SH NAME
+usleep \- suspend execution for an interval
+.SH SYNOPSIS
+.LP
+\fB#include <unistd.h>
+.br
+.sp
+int usleep(useconds_t\fP \fIuseconds\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIusleep\fP() function shall cause the calling thread to be suspended
+from execution until either the number of realtime
+microseconds specified by the argument \fIuseconds\fP has elapsed
+or a signal is delivered to the calling thread 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.
+.LP
+The \fIuseconds\fP argument shall be less than one million. If the
+value of \fIuseconds\fP is 0, then the call has no
+effect.
+.LP
+If a SIGALRM signal is generated for the calling process during execution
+of \fIusleep\fP() and if the SIGALRM signal is being
+ignored or blocked from delivery, it is unspecified whether \fIusleep\fP()
+returns when the SIGALRM signal is scheduled. If the
+signal is being blocked, it is also unspecified whether it remains
+pending after \fIusleep\fP() returns or it is discarded.
+.LP
+If a SIGALRM signal is generated for the calling process during execution
+of \fIusleep\fP(), except as a result of a prior call
+to \fIalarm\fP(), and if the SIGALRM signal is not being ignored or
+blocked from delivery,
+it is unspecified whether that signal has any effect other than causing
+\fIusleep\fP() to return.
+.LP
+If a signal-catching function interrupts \fIusleep\fP() and examines
+or changes either the time a SIGALRM is scheduled to be
+generated, the action associated with the SIGALRM signal, or whether
+the SIGALRM signal is blocked from delivery, the results are
+unspecified.
+.LP
+If a signal-catching function interrupts \fIusleep\fP() and calls
+\fIsiglongjmp\fP() or \fIlongjmp\fP() to restore an
+environment saved prior to the \fIusleep\fP() call, the action associated
+with the SIGALRM signal and the time at which a SIGALRM
+signal is scheduled to be generated are unspecified. It is also unspecified
+whether the SIGALRM signal is blocked, unless the
+process' signal mask is restored as part of the environment.
+.LP
+Implementations may place limitations on the granularity of timer
+values. For each interval timer, if the requested timer value
+requires a finer granularity than the implementation supports, the
+actual timer value shall be rounded up to the next supported
+value.
+.LP
+Interactions between \fIusleep\fP() and any of the following are unspecified:
+.sp
+.RS
+.nf
+
+\fInanosleep\fP()
+\fIsetitimer\fP()
+\fItimer_create\fP()
+\fItimer_delete\fP()
+\fItimer_getoverrun\fP()
+\fItimer_gettime\fP()
+\fItimer_settime\fP()
+\fIualarm\fP()
+\fIsleep\fP()
+.fi
+.RE
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIusleep\fP() shall return 0; otherwise,
+it shall return -1 and set \fIerrno\fP to indicate the
+error.
+.SH ERRORS
+.LP
+The \fIusleep\fP() function may fail if:
+.TP 7
+.B EINVAL
+The time interval specified one million or more microseconds.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+Applications are recommended to use \fInanosleep\fP() if the Timers
+option is
+supported, or \fIsetitimer\fP(), \fItimer_create\fP(), \fItimer_delete\fP(),
+\fItimer_getoverrun\fP(), \fItimer_gettime\fP(), or \fItimer_settime\fP()
+instead of this function.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIalarm\fP(), \fIgetitimer\fP(), \fInanosleep\fP(), \fIsigaction\fP(),
+\fIsleep\fP(),
+\fItimer_create\fP(), \fItimer_delete\fP(), \fItimer_getoverrun\fP(),
+the Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<unistd.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .