4.4BSD/usr/share/man/cat2/msync.0

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MSYNC(2)                    BSD Programmer's Manual                   MSYNC(2)

NNAAMMEE
     mmssyynncc - synchronize a mapped region

SSYYNNOOPPSSIISS
     mmssyynncc(_c_a_d_d_r___t _a_d_d_r, _i_n_t _l_e_n);

DDEESSCCRRIIPPTTIIOONN
     The mmssyynncc() system call writes any modified pages back to the filesystem
     and updates the file modification time.  If _l_e_n is 0, all modified pages
     within the region containing _a_d_d_r will be flushed; if _l_e_n is non-zero,
     only the pages containing _a_d_d_r and _l_e_n succeeding locations will be exam-
     ined.  Any required synchronization of memory caches will also take place
     at this time.  Filesystem operations on a file that is mapped for shared
     modifications are unpredictable except after an mmssyynncc().

SSEEEE AALLSSOO
     madvise(2),  munmap(2),  mprotect(2),  mincore(2)

HHIISSTTOORRYY
     The mmssyynncc() function first appeared in 4.4BSD.

4.4BSD                           June 9, 1993                                1