+++ /dev/null
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" %%%LICENSE_START(VERBATIM)
-.\" Permission is granted to make and distribute verbatim copies of this
-.\" manual provided the copyright notice and this permission notice are
-.\" preserved on all copies.
-.\"
-.\" Permission is granted to copy and distribute modified versions of this
-.\" manual under the conditions for verbatim copying, provided that the
-.\" entire resulting derived work is distributed under the terms of a
-.\" permission notice identical to this one.
-.\"
-.\" Since the Linux kernel and libraries are constantly changing, this
-.\" manual page may be incorrect or out-of-date. The author(s) assume no
-.\" responsibility for errors or omissions, or for damages resulting from
-.\" the use of the information contained herein. The author(s) may not
-.\" have taken the same level of care in the production of this manual,
-.\" which is licensed free of charge, as they might when working
-.\" professionally.
-.\"
-.\" Formatted or processed versions of this manual, if unaccompanied by
-.\" the source, must acknowledge the copyright and authors of this work.
-.\" %%%LICENSE_END
-.\"
-.\" References consulted:
-.\" Linux libc source code
-.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\" 386BSD man pages
-.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
-.\" Modified 2001-04-01 by aeb
-.\" Modified 2003-07-23 by aeb
-.\"
-.TH USLEEP 3 2013-12-10 "" "Linux Programmer's Manual"
-.SH NAME
-usleep \- suspend execution for microsecond intervals
-.SH SYNOPSIS
-.nf
-.B "#include <unistd.h>"
-.sp
-.BI "int usleep(useconds_t " usec );
-.fi
-.sp
-.in -4n
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.in
-.sp
-.BR usleep ():
-.ad l
-.RS 4
-.PD 0
-.TP 4
-Since glibc 2.12:
-.nf
-_BSD_SOURCE ||
- (_XOPEN_SOURCE\ >=\ 500 ||
- _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED) &&
- !(_POSIX_C_SOURCE\ >=\ 200809L || _XOPEN_SOURCE\ >=\ 700)
-.TP 4
-.fi
-Before glibc 2.12:
-_BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500 ||
-_XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
-.PD
-.RE
-.ad b
-.SH DESCRIPTION
-The
-.BR usleep ()
-function suspends execution of the calling thread for
-(at least) \fIusec\fP microseconds.
-The sleep may be lengthened slightly
-by any system activity or by the time spent processing the call or by the
-granularity of system timers.
-.SH RETURN VALUE
-The
-.BR usleep ()
-function returns 0 on success.
-On error, \-1 is returned, with
-.I errno
-set to indicate the cause of the error.
-.SH ERRORS
-.TP
-.B EINTR
-Interrupted by a signal; see
-.BR signal (7).
-.TP
-.B EINVAL
-\fIusec\fP is not smaller than 1000000.
-(On systems where that is considered an error.)
-.SH ATTRIBUTES
-.SS Multithreading (see pthreads(7))
-The
-.BR usleep ()
-function is thread-safe.
-.SH CONFORMING TO
-4.3BSD, POSIX.1-2001.
-POSIX.1-2001 declares this function obsolete; use
-.BR nanosleep (2)
-instead.
-POSIX.1-2008 removes the specification of
-.BR usleep ().
-
-On the original BSD implementation,
-and in glibc before version 2.2.2, the return type of this function is
-.IR void .
-The POSIX version returns
-.IR int ,
-and this is also the prototype used since glibc 2.2.2.
-
-Only the
-.B EINVAL
-error return is documented by SUSv2 and POSIX.1-2001.
-.SH NOTES
-The type
-.I useconds_t
-is an unsigned integer type capable of holding integers
-in the range [0,1000000].
-Programs will be more portable
-if they never mention this type explicitly.
-Use
-.in +4n
-.nf
-.sp
-#include <unistd.h>
-\&...
- unsigned int usecs;
-\&...
- usleep(usecs);
-.fi
-.in
-.LP
-The interaction of this function with the
-.B SIGALRM
-signal, and with other timer functions such as
-.BR alarm (2),
-.BR sleep (3),
-.BR nanosleep (2),
-.BR setitimer (2),
-.BR timer_create (2),
-.BR timer_delete (2),
-.BR timer_getoverrun (2),
-.BR timer_gettime (2),
-.BR timer_settime (2),
-.BR ualarm (3)
-is unspecified.
-.SH SEE ALSO
-.BR alarm (2),
-.BR getitimer (2),
-.BR nanosleep (2),
-.BR select (2),
-.BR setitimer (2),
-.BR sleep (3),
-.BR ualarm (3),
-.BR time (7)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.
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