1FCLOSE(3P) POSIX Programmer's Manual FCLOSE(3P)
2
6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
10
13 fclose — close a stream
14
16 #include <stdio.h>
17 int fclose(FILE *stream);
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21 The functionality described on this reference page is aligned with the
22 ISO C standard. Any conflict between the requirements described here
23 and the ISO C standard is unintentional. This volume of POSIX.1‐2008
24 defers to the ISO C standard.
25 The fclose() function shall cause the stream pointed to by stream to be
27 flushed and the associated file to be closed. Any unwritten buffered
28 data for the stream shall be written to the file; any unread buffered
29 data shall be discarded. Whether or not the call succeeds, the stream
30 shall be disassociated from the file and any buffer set by the setbuf()
31 or setvbuf() function shall be disassociated from the stream. If the
32 associated buffer was automatically allocated, it shall be deallocated.
33 If the file is not already at EOF, and the file is one capable of seek‐
35 ing, the file offset of the underlying open file description shall be
36 set to the file position of the stream if the stream is the active han‐
37 dle to the underlying file description.
38 The fclose() function shall mark for update the last data modification
40 and last file status change timestamps of the underlying file, if the
41 stream was writable, and if buffered data remains that has not yet been
42 written to the file. The fclose() function shall perform the equivalent
43 of a close() on the file descriptor that is associated with the stream
44 pointed to by stream.
45 After the call to fclose(), any use of stream results in undefined
47 behavior.
48
50 Upon successful completion, fclose() shall return 0; otherwise, it
51 shall return EOF and set errno to indicate the error.
52
54 The fclose() function shall fail if:
55 EAGAIN The O_NONBLOCK flag is set for the file descriptor underlying
57 stream and the thread would be delayed in the write operation.
58 EBADF The file descriptor underlying stream is not valid.
60 EFBIG An attempt was made to write a file that exceeds the maximum
62 file size.
63 EFBIG An attempt was made to write a file that exceeds the file size
65 limit of the process.
66 EFBIG The file is a regular file and an attempt was made to write at
68 or beyond the offset maximum associated with the corresponding
69 stream.
70 EINTR The fclose() function was interrupted by a signal.
72 EIO The process is a member of a background process group attempting
74 to write to its controlling terminal, TOSTOP is set, the calling
75 thread is not blocking SIGTTOU, the process is not ignoring
76 SIGTTOU, and the process group of the process is orphaned. This
77 error may also be returned under implementation-defined condi‐
78 tions.
79 ENOMEM The underlying stream was created by open_memstream() or
81 open_wmemstream() and insufficient memory is available.
82 ENOSPC There was no free space remaining on the device containing the
84 file or in the buffer used by the fmemopen() function.
85 EPIPE An attempt is made to write to a pipe or FIFO that is not open
87 for reading by any process. A SIGPIPE signal shall also be sent
88 to the thread.
89 The fclose() function may fail if:
91 ENXIO A request was made of a nonexistent device, or the request was
93 outside the capabilities of the device.
94 The following sections are informative.
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98 None.
99
101 None.
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104 None.
105
107 None.
108
110 Section 2.5, Standard I/O Streams, close(), fmemopen(), fopen(), getr‐
111 limit(), open_memstream(), ulimit()
112 The Base Definitions volume of POSIX.1‐2008, <stdio.h>
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116 Portions of this text are reprinted and reproduced in electronic form
117 from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
118 -- Portable Operating System Interface (POSIX), The Open Group Base
119 Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
120 cal and Electronics Engineers, Inc and The Open Group. (This is
121 POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
122 event of any discrepancy between this version and the original IEEE and
123 The Open Group Standard, the original IEEE and The Open Group Standard
124 is the referee document. The original Standard can be obtained online
125 at http://www.unix.org/online.html .
126 Any typographical or formatting errors that appear in this page are
128 most likely to have been introduced during the conversion of the source
129 files to man page format. To report such errors, see https://www.ker‐
130 nel.org/doc/man-pages/reporting_bugs.html .
131IEEE/The Open Group 2013 FCLOSE(3P)