fdatasync(2) [osf1 man page]

fdatasync(2)							System Calls Manual						      fdatasync(2)

NAME

       fdatasync -  Writes data changes in a file to permanent storage

SYNOPSIS

       #include <unistd.h>

       int fdatasync (	    int fildes );

PARAMETERS

       Specifies a valid open file descriptor.

DESCRIPTION

       The  fdatasync function causes system buffers containing a file's modified data to be written to permanent storage.  The fdatasync function
       does not return until the operation has been completed. The fdatasync function provides data integrity, ensuring  that  data  in  permanent
       storage	is  identical  to data in the buffer. However, use of fdatasync does not guarantee that file control information such as owner and
       modification time has been updated to permanent storage (see the fsync function).

NOTES

       The file identified by the fildes parameter must be open for writing when the fdatasync function is issued or the call will fail.

RETURN VALUES

       Upon successful completion, the fdatasync function returns a value of 0 (zero). If the fdatasync function fails, a value of -1 is  returned
       and errno is set to indicate the error. If fdatasync fails, outstanding I/O operations are not guaranteed to have been completed.

ERRORS

       If the fdatasync function fails, errno may be set to one of the following values:

       [EBADF]	      The fildes parameter is not a valid file descriptor.

       [EINVAL]       The fildes parameter does not refer to a file on which this operation is possible.

       If any queued I/O operations fail, the fdatasync function returns error conditions defined for the read and write functions.

RELATED INFORMATION

       Functions: fcntl(2), fsync(2), open(2), read(2), sync(2), write(2) delim off

																      fdatasync(2)

fsync(2)							System Calls Manual							  fsync(2)

NAME

       fsync -	Writes changes in a file to permanent storage

SYNOPSIS

       #include <unistd.h>

       int fsync (	int fildes );

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       fsync(): XPG4

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Specifies a valid open file descriptor.

DESCRIPTION

       The  fsync  function  causes system buffers containing a file's modified data and attributes to be written to permanent storage.  The fsync
       function does not return until the operation has been completed.  The fsync function provides file integrity, ensuring that data  and  file
       attribute information in permanent storage is identical to data and file attribute information in the buffer.

NOTES

       The file identified by the fildes parameter must be open for writing when the fsync function is issued or the call will fail.

RETURN VALUES

       Upon  successful  completion,  the  fsync  function returns a value of 0 (zero). If the fsync function fails, a value of -1 is returned and
       errno is set to indicate the error. If fsync fails, outstanding I/O operations are not guaranteed to have been completed.

ERRORS

       If the fsync function fails, errno may be set to one of the following values:

       [EBADF]	      The fildes parameter is not a valid file descriptor.

       [EINVAL]       The fildes parameter does not refer to a file on which this operation is possible.

       If any queued I/O operations fail, the fsync function returns error conditions defined for the read and write functions.

RELATED INFORMATION

       Functions: aio_fsync(2), fdatasync(2), fcntl(2), open(2), read(2), sync(2), write(2)

       Standards: standards(5) delim off

																	  fsync(2)