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+'\" et
+.TH FSEEK "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH 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.
+.\"
+.SH NAME
+fseek,
+fseeko
+\(em reposition a file-position indicator in a stream
+.SH SYNOPSIS
+.LP
+.nf
+#include <stdio.h>
+.P
+int fseek(FILE *\fIstream\fP, long \fIoffset\fP, int \fIwhence\fP);
+int fseeko(FILE *\fIstream\fP, off_t \fIoffset\fP, int \fIwhence\fP);
+.fi
+.SH DESCRIPTION
+The functionality described on this reference page is aligned with the
+ISO\ C standard. Any conflict between the requirements described here and the
+ISO\ C standard is unintentional. This volume of POSIX.1\(hy2017 defers to the ISO\ C standard.
+.P
+The
+\fIfseek\fR()
+function shall set the file-position indicator for the stream pointed
+to by
+.IR stream .
+If a read or write error occurs, the error indicator for the stream
+shall be set and
+\fIfseek\fR()
+fails.
+.P
+The new position, measured in bytes from the beginning of the file,
+shall be obtained by adding
+.IR offset
+to the position specified by
+.IR whence .
+The specified point is the beginning of the file for SEEK_SET, the
+current value of the file-position indicator for SEEK_CUR, or
+end-of-file for SEEK_END.
+.P
+If the stream is to be used with wide-character input/output functions,
+the application shall ensure that
+.IR offset
+is either 0 or a value returned by an earlier call to
+\fIftell\fR()
+on the same stream and
+.IR whence
+is SEEK_SET.
+.P
+A successful call to
+\fIfseek\fR()
+shall clear the end-of-file indicator for the stream and undo any
+effects of
+\fIungetc\fR()
+and
+\fIungetwc\fR()
+on the same stream. After an
+\fIfseek\fR()
+call, the next operation on an update stream may be either input or
+output.
+.P
+If the most recent operation, other than
+\fIftell\fR(),
+on a given stream is
+\fIfflush\fR(),
+the file offset in the underlying open file description shall be
+adjusted to reflect the location specified by
+\fIfseek\fR().
+.P
+The
+\fIfseek\fR()
+function shall allow the file-position indicator to be set beyond the
+end of existing data in the file. If data is later written at this
+point, subsequent reads of data in the gap shall return bytes with the
+value 0 until data is actually written into the gap.
+.P
+The behavior of
+\fIfseek\fR()
+on devices which are incapable of seeking is implementation-defined.
+The value of the file offset associated with such a device is
+undefined.
+.P
+If the stream is writable and buffered data had not been written to the
+underlying file,
+\fIfseek\fR()
+shall cause the unwritten data to be written to the file and shall mark
+the last data modification and last file status change timestamps
+of the file for update.
+.P
+In a locale with state-dependent encoding, whether
+\fIfseek\fR()
+restores the stream's shift state is implementation-defined.
+.P
+The
+\fIfseeko\fR()
+function shall be equivalent to the
+\fIfseek\fR()
+function except that the
+.IR offset
+argument is of type
+.BR off_t .
+.SH "RETURN VALUE"
+The
+\fIfseek\fR()
+and
+\fIfseeko\fR()
+functions shall return 0 if they succeed.
+.P
+Otherwise, they shall return \-1 and set
+.IR errno
+to indicate the error.
+.SH ERRORS
+The
+\fIfseek\fR()
+and
+\fIfseeko\fR()
+functions shall fail if,
+either the
+.IR stream
+is unbuffered or the
+.IR stream 's
+buffer needed to be flushed, and the call to
+\fIfseek\fR()
+or
+\fIfseeko\fR()
+causes an underlying
+\fIlseek\fR()
+or
+\fIwrite\fR()
+to be invoked, and:
+.TP
+.BR EAGAIN
+The O_NONBLOCK flag is set for the file descriptor and the thread
+would be delayed in the write operation.
+.TP
+.BR EBADF
+The file descriptor underlying the stream file is not open for writing
+or the stream's buffer needed to be flushed and the file is not open.
+.TP
+.BR EFBIG
+An attempt was made to write a file that exceeds the maximum file size.
+.TP
+.BR EFBIG
+An attempt was made to write a file that exceeds the file size
+limit of the process.
+.TP
+.BR EFBIG
+The file is a regular file and an attempt was made to write at or
+beyond the offset maximum associated with the corresponding stream.
+.TP
+.BR EINTR
+The write operation was terminated due to the receipt of a signal,
+and no data was transferred.
+.TP
+.BR EINVAL
+The
+.IR whence
+argument is invalid. The resulting file-position indicator would be
+set to a negative value.
+.TP
+.BR EIO
+A physical I/O error has occurred, or the process is a member of a
+background process group attempting to perform a
+\fIwrite\fR()
+to its controlling terminal, TOSTOP is set, the calling thread is not
+blocking SIGTTOU, the process is not ignoring SIGTTOU, and the process
+group of the process is orphaned.
+This error may also be returned under implementation-defined conditions.
+.TP
+.BR ENOSPC
+There was no free space remaining on the device containing the file.
+.TP
+.BR EOVERFLOW
+For
+\fIfseek\fR(),
+the resulting file offset would be a value which cannot be represented
+correctly in an object of type
+.BR long .
+.TP
+.BR EOVERFLOW
+For
+\fIfseeko\fR(),
+the resulting file offset would be a value which cannot be represented
+correctly in an object of type
+.BR off_t .
+.TP
+.BR EPIPE
+An attempt was made to write to a pipe or FIFO that is not open for
+reading by any process; a SIGPIPE
+signal shall also be sent to the thread.
+.TP
+.BR ESPIPE
+The file descriptor underlying
+.IR stream
+is associated with a pipe, FIFO, or socket.
+.P
+The
+\fIfseek\fR()
+and
+\fIfseeko\fR()
+functions may fail if:
+.TP
+.BR ENXIO
+A request was made of a nonexistent device, or the request was outside
+the capabilities of the device.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "Section 2.5" ", " "Standard I/O Streams",
+.IR "\fIfopen\fR\^(\|)",
+.IR "\fIfsetpos\fR\^(\|)",
+.IR "\fIftell\fR\^(\|)",
+.IR "\fIgetrlimit\fR\^(\|)",
+.IR "\fIlseek\fR\^(\|)",
+.IR "\fIrewind\fR\^(\|)",
+.IR "\fIulimit\fR\^(\|)",
+.IR "\fIungetc\fR\^(\|)",
+.IR "\fIwrite\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<stdio.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .