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Synchronize the file state
#include <unistd.h>
int fsync( int filedes );
- filedes
- The descriptor for the file that you want to synchronize.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The fsync() function forces all queued I/O operations for the
file specified by the filedes file descriptor to finish,
synchronizing the file's state.
The function blocks until this is finished.
For more information about synchronizing, see
“Filesystems and block I/O (devb-*) drivers”
in the Fine-Tuning Your System chapter of the
QNX Neutrino User's Guide.
Although similar to
fdatasync(),
fsync() also guarantees the integrity of
file information such as access and modification times.
0 for success, or -1 if an error occurs (errno is set).
- EBADF
- The filedes argument isn't a valid file descriptor open for writing.
- EINVAL
- The implementation doesn't support synchronized I/O for the given file.
- ENOSYS
- The fsync() function isn't supported for the filesystem specified by filedes.
POSIX 1003.1 FSC
Safety: | |
Cancellation point |
Yes |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
aio_fsync(),
close(),
fcntl(),
fdatasync(),
open(),
read(),
sync(),
write()
“Filesystems and block I/O (devb-*) drivers”
in the Fine-Tuning Your System chapter of the
QNX Neutrino User's Guide
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