Originální popis anglicky:
sync - commit buffer cache to disk
Návod, kniha: Linux Programmer's Manual
first commits inodes to buffers, and then buffers to disk.
This function is always successful.
SVr4, SVID, X/OPEN, BSD 4.3
According to the standard specification (e.g., SVID), sync()
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.)
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.