Originální popis anglicky:
fsetpos - set current file position
Návod, kniha: POSIX Programmer's Manual
#include <stdio.h>
int fsetpos(FILE *
stream, const fpos_t
*pos );
The
fsetpos() function shall set the file position and state indicators
for the stream pointed to by
stream according to the value of the
object pointed to by
pos, which the application shall ensure is a value
obtained from an earlier call to
fgetpos() on the same stream. If a
read or write error occurs, the error indicator for the stream shall be set
and
fsetpos() fails.
A successful call to the
fsetpos() function shall clear the end-of-file
indicator for the stream and undo any effects of
ungetc() on the same
stream. After an
fsetpos() call, the next operation on an update stream
may be either input or output.
The behavior of
fsetpos() on devices which are incapable of seeking is
implementation-defined. The value of the file offset associated with such a
device is undefined.
The
fsetpos() function shall return 0 if it succeeds; otherwise, it shall
return a non-zero value and set
errno to indicate the error.
The
fsetpos() function shall fail if, either the
stream is
unbuffered or the
stream's buffer needed to be flushed, and the call to
fsetpos() causes an underlying
lseek() or
write() to be
invoked, and:
- EAGAIN
- The O_NONBLOCK flag is set for the file descriptor and the
process would be delayed in the write operation.
- 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.
- EFBIG
- An attempt was made to write a file that exceeds the
maximum file size.
- EFBIG
- An attempt was made to write a file that exceeds the
process' file size limit.
- 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.
- EINTR
- The write operation was terminated due to the receipt of a
signal, and no data was transferred.
- EIO
- A physical I/O error has occurred, or the process is a
member of a background process group attempting to perform a
write() 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.
- ENOSPC
- There was no free space remaining on the device containing
the file.
- ENXIO
- A request was made of a nonexistent device, or the request
was outside the capabilities of the device.
- EPIPE
- The file descriptor underlying stream is associated
with a pipe or FIFO.
- 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.
The following sections are informative.
None.
None.
None.
None.
fopen() ,
ftell() ,
lseek() ,
rewind() ,
ungetc() ,
write() , the Base Definitions volume of
IEEE Std 1003.1-2001,
<stdio.h>
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
.
