• 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 3.19 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/.

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