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 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED 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 3.27 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 2010-09-20 SYNC(2)
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