Added man pages.

man/man2/sync.2

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+.\" Copyright (c) 1980 Regents of the University of California.
+.\" All rights reserved.  The Berkeley software License Agreement
+.\" specifies the terms and conditions for redistribution.
+.\"
+.\"	@(#)sync.2	6.2 (Berkeley) 6/30/85
+.\"
+.TH SYNC 2 "June 30, 1985"
+.UC 4
+.SH NAME
+sync \- update super-block
+.SH SYNOPSIS
+.nf
+.ft B
+#include <unistd.h>
+
+int sync(void)
+.ft R
+.fi
+.SH DESCRIPTION
+.B Sync
+causes all information in the file system
+buffers that should be on disk to be written out.
+This includes modified super blocks,
+modified i-nodes, and delayed block I/O.
+.SH "SEE ALSO"
+.BR reboot (2),
+.BR sync (8).