table of contents
other sections
FSYNC(2) | System Calls Manual | FSYNC(2) |
NAME¶
fsync — synchronise changes to a fileLIBRARY¶
Standard C Library (libc, -lc)SYNOPSIS¶
#include <unistd.h> intfsync(int fd);
DESCRIPTION¶
The fsync() system call 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. The fsync() system call should be used by programs that require a file to be in a known state, for example, in building a simple transaction facility.RETURN VALUES¶
The fsync() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.ERRORS¶
The fsync() fails if:- [
EBADF
] - The fd argument is not a valid descriptor.
- [
EINVAL
] - The fd argument refers to a socket, not to a file.
- [
EIO
] - An I/O error occurred while reading from or writing to the file system.
SEE ALSO¶
sync(2), syncer(4), sync(8)HISTORY¶
The fsync() system call appeared in 4.2BSD.June 4, 1993 | Debian |