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SYNC(2) Linux Programmer's Manual SYNC(2)
sync - commit buffer cache to disk.
sync first commits inodes to buffers, and then buffers to disk.
SVr4, SVID, X/OPEN, BSD 4.3
According to the standard specification (e.g., SVID), sync() schedules the writes, but may
return before the actual writing is done. However, since version 1.3.20 Linux does actu-
ally wait. (This still does not guarantee data integrity: modern disks have large
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
bdflush(2), fsync(2), fdatasync(2), update(8), sync(8)
Linux 2.4 2001-10-10 SYNC(2)
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