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Realtime Library Functions | fdatasync(3RT) |
| fdatasync - synchronize a file's data |
SYNOPSIS
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cc [ flag... ] file... -lrt [ library... ]
#include <unistd.h> int fdatasync(int fildes); |
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The fdatasync() function forces all currently queued I/O operations associated with the file indicated by file descriptor fildes to the synchronized I/O completion
state.
The functionality is as described for fsync(3C) (with the
symbol _XOPEN_REALTIME defined), with the exception that all I/O operations are completed as defined for synchronised I/O data integrity completion.
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If successful, the fdatasync() function returns 0. Otherwise, the function returns -1 and sets errno to indicate the
error. If the fdatasync() function fails, outstanding I/O operations are not guaranteed to have been completed.
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The fdatasync() function will fail if:
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EBADF
- The fildes argument is not a valid file descriptor open for writing.
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EINVAL
- The system does not support synchronized I/O for this file.
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ENOSYS
- The function fdatasync() is not supported by the system.
In the event that any of the queued I/O operations fail, fdatasync() returns the error conditions defined for read(2) and write(2).
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See attributes(5) for descriptions of the following
attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
MT-Level | Async-Signal-Safe |
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