FSYNC(2) BSD Programmer's Manual FSYNC(2)
fsync - synchronize a file's in-core state with that on disk
#include <unistd.h> int fsync(int fd);
fsync() causes all modified data and attributes of fd to be moved to a permanent storage device. This normally results in all in-core modified copies of buffers for the associated file to be written to a disk. fsync() should be used by programs that require a file to be in a known state, for example, in building a simple transaction facility.
A 0 value is returned on success. A -1 value indicates an error.
The fsync() fails if: [EBADF] fd is not a valid descriptor. [EINVAL] fd refers to a socket, not to a file. [EIO] An I/O error occurred while reading from or writing to the file system.
sync(2), sync(8), update(8)
The fsync() function call appeared in 4.2BSD. MirOS BSD #10-current June 4, 1993 1
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