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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "FSEEK" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" fseek 
+.SH NAME
+fseek, fseeko \- reposition a file-position indicator in a stream
+.SH SYNOPSIS
+.LP
+\fB#include <stdio.h>
+.br
+.sp
+int fseek(FILE *\fP\fIstream\fP\fB, long\fP \fIoffset\fP\fB, int\fP
+\fIwhence\fP\fB);
+.br
+\fP
+.LP
+\fBint fseeko(FILE *\fP\fIstream\fP\fB, off_t\fP \fIoffset\fP\fB,
+int\fP \fIwhence\fP\fB);
+\fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIfseek\fP() function shall set the file-position indicator for
+the stream pointed to by \fIstream\fP. If a read or write
+error occurs, the error indicator for the stream shall be set and
+\fIfseek\fP() fails.
+.LP
+The new position, measured in bytes from the beginning of the file,
+shall be obtained by adding \fIoffset\fP to the position
+specified by \fIwhence\fP. 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.
+.LP
+If the stream is to be used with wide-character input/output functions,
+the application shall ensure that \fIoffset\fP is
+either 0 or a value returned by an earlier call to \fIftell\fP() on
+the same stream and
+\fIwhence\fP is SEEK_SET.
+.LP
+A successful call to \fIfseek\fP() shall clear the end-of-file indicator
+for the stream and undo any effects of \fIungetc\fP() and \fIungetwc\fP()
+on the same stream.
+After an \fIfseek\fP() call, the next operation on an update stream
+may be either input or output.
+.LP
+If
+the most recent operation, other than \fIftell\fP(), on a given stream
+is \fIfflush\fP(), the file offset in the underlying open file description
+shall be adjusted to
+reflect the location specified by \fIfseek\fP().
+.LP
+The \fIfseek\fP() 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.
+.LP
+The behavior of \fIfseek\fP() on devices which are incapable of seeking
+is implementation-defined. The value of the file offset
+associated with such a device is undefined.
+.LP
+If the stream is writable and buffered data had not been written to
+the underlying file, \fIfseek\fP() shall cause the
+unwritten data to be written to the file and shall mark the \fIst_ctime\fP
+and \fIst_mtime\fP fields of the file for update.
+.LP
+In a locale with state-dependent encoding, whether \fIfseek\fP() restores
+the stream's shift state is
+implementation-defined.
+.LP
+The \fIfseeko\fP() function shall be equivalent to the \fIfseek\fP()
+function except that the \fIoffset\fP argument is of
+type \fBoff_t\fP. 
+.SH RETURN VALUE
+.LP
+The \fIfseek\fP()   \ and \fIfseeko\fP()  functions
+shall return 0 if they succeed.
+.LP
+Otherwise, they shall return -1 and set \fIerrno\fP to indicate the
+error. 
+.SH ERRORS
+.LP
+The \fIfseek\fP()   \ and \fIfseeko\fP() 
+\ functions shall fail if,   \ either the \fIstream\fP is unbuffered
+or the \fIstream\fP's buffer needed to be flushed, and
+the call to \fIfseek\fP() or \fIfseeko\fP() causes an underlying \fIlseek\fP()
+or \fIwrite\fP() to be invoked, and: 
+.TP 7
+.B EAGAIN
+The O_NONBLOCK flag is set for the file descriptor and the process
+would be delayed in the write operation. 
+.TP 7
+.B 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 7
+.B EFBIG
+An
+attempt was made to write a file that exceeds the maximum file size.
+.TP 7
+.B EFBIG
+An attempt was made to write a file that exceeds the process' file
+size limit. 
+.TP 7
+.B 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 7
+.B EINTR
+The write operation was terminated due to the receipt of a signal,
+and no data was transferred. 
+.TP 7
+.B EINVAL
+The \fIwhence\fP argument is invalid. The resulting file-position
+indicator would be set to a negative value. 
+.TP 7
+.B EIO
+A
+physical I/O error has occurred, or the process is a member of a background
+process group attempting to perform a \fIwrite\fP() to its controlling
+terminal, TOSTOP is set, the process is neither ignoring nor
+blocking SIGTTOU, and the process group of the process is orphaned.
+This error may also be returned under implementation-defined
+conditions. 
+.TP 7
+.B ENOSPC
+There was no free space remaining on the device containing the file.
+.TP 7
+.B ENXIO
+A
+request was made of a nonexistent device, or the request was outside
+the capabilities of the device. 
+.TP 7
+.B EOVERFLOW
+For \fIfseek\fP(), the resulting file offset would be a value which
+cannot be represented correctly in an object of type
+\fBlong\fP. 
+.TP 7
+.B EOVERFLOW
+For \fIfseeko\fP(), the resulting file offset would be a value which
+cannot be represented correctly in an object of type
+\fBoff_t\fP. 
+.TP 7
+.B 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 7
+.B ESPIPE
+The file descriptor underlying \fIstream\fP is associated with a pipe
+or FIFO. 
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIfopen\fP() , \fIfsetpos\fP() , \fIftell\fP()
+, \fIgetrlimit\fP() , \fIlseek\fP() , \fIrewind\fP() , \fIulimit\fP()
+, \fIungetc\fP() , \fIwrite\fP() , the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<stdio.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 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 .