1FSETPOS(P) POSIX Programmer's Manual FSETPOS(P)
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6 fsetpos - set current file position
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9 #include <stdio.h>
10 int fsetpos(FILE *stream, const fpos_t *pos);
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15 The fsetpos() function shall set the file position and state indicators
16 for the stream pointed to by stream according to the value of the
17 object pointed to by pos, which the application shall ensure is a value
18 obtained from an earlier call to fgetpos() on the same stream. If a
19 read or write error occurs, the error indicator for the stream shall be
20 set and fsetpos() fails.
21 A successful call to the fsetpos() function shall clear the end-of-file
23 indicator for the stream and undo any effects of ungetc() on the same
24 stream. After an fsetpos() call, the next operation on an update stream
25 may be either input or output.
26 The behavior of fsetpos() on devices which are incapable of seeking is
28 implementation-defined. The value of the file offset associated with
29 such a device is undefined.
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32 The fsetpos() function shall return 0 if it succeeds; otherwise, it
33 shall return a non-zero value and set errno to indicate the error.
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36 The fsetpos() function shall fail if, either the stream is
37 unbuffered or the stream's buffer needed to be flushed, and the call to
38 fsetpos() causes an underlying lseek() or write() to be invoked, and:
39 EAGAIN The O_NONBLOCK flag is set for the file descriptor and the
41 process would be delayed in the write operation.
42 EBADF The file descriptor underlying the stream file is not open for
44 writing or the stream's buffer needed to be flushed and the file
45 is not open.
46 EFBIG An attempt was made to write a file that exceeds the maximum
48 file size.
49 EFBIG An attempt was made to write a file that exceeds the process'
51 file size limit.
52 EFBIG The file is a regular file and an attempt was made to write at
54 or beyond the offset maximum associated with the corresponding
55 stream.
56 EINTR The write operation was terminated due to the receipt of a sig‐
58 nal, and no data was transferred.
59 EIO A physical I/O error has occurred, or the process is a member of
61 a background process group attempting to perform a write() to
62 its controlling terminal, TOSTOP is set, the process is neither
63 ignoring nor blocking SIGTTOU, and the process group of the
64 process is orphaned. This error may also be returned under
65 implementation-defined conditions.
66 ENOSPC There was no free space remaining on the device containing the
68 file.
69 ENXIO A request was made of a nonexistent device, or the request was
71 outside the capabilities of the device.
72 EPIPE The file descriptor underlying stream is associated with a pipe
74 or FIFO.
75 EPIPE An attempt was made to write to a pipe or FIFO that is not open
77 for reading by any process; a SIGPIPE signal shall also be sent
78 to the thread.
79 The following sections are informative.
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84 None.
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87 None.
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90 None.
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93 None.
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96 fopen() , ftell() , lseek() , rewind() , ungetc() , write() , the Base
97 Definitions volume of IEEE Std 1003.1-2001, <stdio.h>
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100 Portions of this text are reprinted and reproduced in electronic form
101 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
102 -- Portable Operating System Interface (POSIX), The Open Group Base
103 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
104 Electrical and Electronics Engineers, Inc and The Open Group. In the
105 event of any discrepancy between this version and the original IEEE and
106 The Open Group Standard, the original IEEE and The Open Group Standard
107 is the referee document. The original Standard can be obtained online
108 at http://www.opengroup.org/unix/online.html .
109IEEE/The Open Group 2003 FSETPOS(P)