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sync(2) [osf1 man page]

sync(2) 							System Calls Manual							   sync(2)

NAME
sync - Updates all file systems SYNOPSIS
#include <unistd.h> void sync (void); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: sync(): XPG4-UNIX Refer to the standards(5) reference page for more information about industry standards and associated tags. DESCRIPTION
The sync() function causes all information in memory that should be on disk to be written out. The writing, although scheduled, is not nec- essarily complete upon return from the sync() function. Types of information to be written include modified superblocks, inodes, data blocks, and indirect blocks. The sync() function should be used by programs that examine a file system, such as the df command and the fsck command. RELATED INFORMATION
Functions: fsync(2) Commands: sync(8) Standards: standards(5) delim off sync(2)

Check Out this Related Man Page

SYNC(2) 						     Linux Programmer's Manual							   SYNC(2)

NAME
sync - commit buffer cache to disk SYNOPSIS
#include <unistd.h> void sync(void); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sync(): _BSD_SOURCE || _XOPEN_SOURCE >= 500 DESCRIPTION
sync() first commits inodes to buffers, and then buffers to disk. ERRORS
This function is always successful. CONFORMING TO
SVr4, 4.3BSD, POSIX.1-2001. NOTES
Since glibc 2.2.2 the Linux prototype is as listed above, following the various standards. In libc4, libc5, and glibc up to 2.2.1 it was "int sync(void)", and sync() always returned 0. BUGS
According to the standard specification (e.g., POSIX.1-2001), sync() schedules the writes, but may return before the actual writing is done. However, since version 1.3.20 Linux does actually wait. (This still does not guarantee data integrity: modern disks have large caches.) SEE ALSO
bdflush(2), fdatasync(2), fsync(2), sync(8), update(8) COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2007-07-26 SYNC(2)
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