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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 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 (date) "Linux man-pages (unreleased)"
-.SH NAME
-usleep \- suspend execution for microsecond intervals
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B "#include <unistd.h>"
-.PP
-.BI "int usleep(useconds_t " usec );
-.fi
-.PP
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.PP
-.BR usleep ():
-.nf
-    Since glibc 2.12:
-        (_XOPEN_SOURCE >= 500) && ! (_POSIX_C_SOURCE >= 200809L)
-            || /* glibc >= 2.19: */ _DEFAULT_SOURCE
-            || /* glibc <= 2.19: */ _BSD_SOURCE
-    Before glibc 2.12:
-        _BSD_SOURCE || _XOPEN_SOURCE >= 500
-.\"    || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
-.fi
-.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 error.
-.SH ERRORS
-.TP
-.B EINTR
-Interrupted by a signal; see
-.BR signal (7).
-.TP
-.B EINVAL
-\fIusec\fP is greater than or equal to 1000000.
-(On systems where that is considered an error.)
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.BR usleep ()
-T}	Thread safety	MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-None.
-.SH HISTORY
-4.3BSD, POSIX.1-2001.
-POSIX.1-2001 declares it obsolete, suggesting
-.BR nanosleep (2)
-instead.
-Removed in POSIX.1-2008.
-.PP
-On the original BSD implementation,
-and before glibc 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.
-.PP
-Only the
-.B EINVAL
-error return is documented by SUSv2 and POSIX.1-2001.
-.SH CAVEATS
-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 useconds_t (3type),
-.BR time (7)