1SYNC(2)                    Linux Programmer's Manual                   SYNC(2)
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NAME

6       sync - commit buffer cache to disk
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SYNOPSIS

9       #include <unistd.h>
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11       void sync(void);
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13   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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15       sync(): _BSD_SOURCE || _XOPEN_SOURCE >= 500
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DESCRIPTION

18       sync() first commits inodes to buffers, and then buffers to disk.
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ERRORS

21       This function is always successful.
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CONFORMING TO

24       SVr4, 4.3BSD, POSIX.1-2001.
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NOTES

27       Since glibc 2.2.2 the Linux prototype is as listed above, following the
28       various standards.  In libc4, libc5, and glibc up to 2.2.1 it was  "int
29       sync(void)", and sync() always returned 0.
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BUGS

32       According  to  the  standard specification (e.g., POSIX.1-2001), sync()
33       schedules the writes, but may return before the actual writing is done.
34       However,  since  version  1.3.20 Linux does actually wait.  (This still
35       does not guarantee data integrity: modern disks have large caches.)
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SEE ALSO

38       bdflush(2), fdatasync(2), fsync(2), sync(8), update(8)
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COLOPHON

41       This page is part of release 3.22 of the Linux  man-pages  project.   A
42       description  of  the project, and information about reporting bugs, can
43       be found at http://www.kernel.org/doc/man-pages/.
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47Linux                             2007-07-26                           SYNC(2)
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