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80 lines
2.6 KiB
Plaintext
80 lines
2.6 KiB
Plaintext
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "FDATASYNC" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" fdatasync
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.SH PROLOG
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This manual page is part of the POSIX Programmer's Manual.
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The Linux implementation of this interface may differ (consult
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the corresponding Linux manual page for details of Linux behavior),
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or the interface may not be implemented on Linux.
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.SH NAME
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fdatasync \- synchronize the data of a file (\fBREALTIME\fP)
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.SH SYNOPSIS
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.LP
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\fB#include <unistd.h>
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.br
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.sp
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int fdatasync(int\fP \fIfildes\fP\fB); \fP
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\fB
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.br
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\fP
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.SH DESCRIPTION
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.LP
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The \fIfdatasync\fP() function shall force all currently queued I/O
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operations associated with the file indicated by file
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descriptor \fIfildes\fP to the synchronized I/O completion state.
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.LP
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The functionality shall be equivalent to \fIfsync\fP() with the symbol
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_POSIX_SYNCHRONIZED_IO defined, with the exception that all I/O operations
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shall be completed as defined for synchronized I/O data
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integrity completion.
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.SH RETURN VALUE
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.LP
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If successful, the \fIfdatasync\fP() function shall return the value
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0; otherwise, the function shall return the value -1 and
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set \fIerrno\fP to indicate the error. If the \fIfdatasync\fP() function
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fails, outstanding I/O operations are not guaranteed to
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have been completed.
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.SH ERRORS
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.LP
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The \fIfdatasync\fP() function shall fail if:
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.TP 7
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.B EBADF
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The \fIfildes\fP argument is not a valid file descriptor open for
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writing.
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.TP 7
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.B EINVAL
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This implementation does not support synchronized I/O for this file.
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.sp
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.LP
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In the event that any of the queued I/O operations fail, \fIfdatasync\fP()
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shall return the error conditions defined for \fIread\fP() and \fIwrite\fP().
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.LP
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\fIThe following sections are informative.\fP
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.SH EXAMPLES
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.LP
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None.
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.SH APPLICATION USAGE
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.LP
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None.
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fIaio_fsync\fP(), \fIfcntl\fP(), \fIfsync\fP(), \fIopen\fP(),
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\fIread\fP(), \fIwrite\fP(), the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
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\fI<unistd.h>\fP
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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