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   fdatasync.3p    ( 3 )

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Пролог (Prolog)

This manual page is part of the POSIX Programmer's Manual.  The
       Linux implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior),
       or the interface may not be implemented on Linux.

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Имя (Name)

fdatasync — synchronize the data of a file (REALTIME)

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Синопсис (Synopsis)

#include <unistd.h>

       int fdatasync(int fildes);

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Описание (Description)

The fdatasync() function shall force all currently queued I/O
       operations associated with the file indicated by file descriptor
       fildes to the synchronized I/O completion state.

       The functionality shall be equivalent to fsync() with the symbol
       _POSIX_SYNCHRONIZED_IO defined, with the exception that all I/O
       operations shall be completed as defined for synchronized I/O
       data integrity completion.

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Возвращаемое значение (Return value)

If successful, the fdatasync() function shall return the value 0;
       otherwise, the function shall return the value -1 and set 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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Ошибки (Error)

The fdatasync() function shall fail if:

       EBADF  The fildes argument is not a valid file descriptor.

       EINVAL This implementation does not support synchronized I/O for
              this file.

       In the event that any of the queued I/O operations fail,
       fdatasync() shall return the error conditions defined for read()
       and write().

       The following sections are informative.

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Примеры (Examples)

None.

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Использование в приложениях (Application usage)

Note that even if the file descriptor is not open for writing, if
       there are any pending write requests on the underlying file, then
       that I/O will be completed prior to the return of fdatasync().

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Обоснование (Rationale)

None.

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Будущие направления (Future directions)

None.

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Смотри также (See also)

aio_fsync(3p), fcntl(3p), fsync(3p), open(3p), read(3p),
       write(3p)

       The Base Definitions volume of POSIX.1‐2017, unistd.h(0p)

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