1FPUTWC(3P) POSIX Programmer's Manual FPUTWC(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
12 fputwc — put a wide-character code on a stream
13
15 #include <stdio.h>
16 #include <wchar.h>
17 wint_t fputwc(wchar_t wc, 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.1‐2017
24 defers to the ISO C standard.
25 The fputwc() function shall write the character corresponding to the
27 wide-character code wc to the output stream pointed to by stream, at
28 the position indicated by the associated file-position indicator for
29 the stream (if defined), and advances the indicator appropriately. If
30 the file cannot support positioning requests, or if the stream was
31 opened with append mode, the character is appended to the output
32 stream. If an error occurs while writing the character, the shift state
33 of the output file is left in an undefined state.
34 The last data modification and last file status change timestamps of
36 the file shall be marked for update between the successful execution of
37 fputwc() and the next successful completion of a call to fflush() or
38 fclose() on the same stream or a call to exit() or abort().
39 The fputwc() function shall not change the setting of errno if success‐
41 ful.
42
44 Upon successful completion, fputwc() shall return wc. Otherwise, it
45 shall return WEOF, the error indicator for the stream shall be set, and
46 errno shall be set to indicate the error.
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49 The fputwc() function shall fail if either the stream is unbuffered or
50 data in the stream's buffer needs to be written, and:
51 EAGAIN The O_NONBLOCK flag is set for the file descriptor underlying
53 stream and the thread would be delayed in the write operation.
54 EBADF The file descriptor underlying stream is not a valid file
56 descriptor open for writing.
57 EFBIG An attempt was made to write to a file that exceeds the maximum
59 file size or the file size limit of the process.
60 EFBIG The file is a regular file and an attempt was made to write at
62 or beyond the offset maximum associated with the corresponding
63 stream.
64 EILSEQ The wide-character code wc does not correspond to a valid char‐
66 acter.
67 EINTR The write operation was terminated due to the receipt of a sig‐
69 nal, and no data was transferred.
70 EIO A physical I/O error has occurred, or the process is a member of
72 a background process group attempting to write to its control‐
73 ling terminal, TOSTOP is set, the calling thread is not blocking
74 SIGTTOU, the process is not ignoring SIGTTOU, and the process
75 group of the process is orphaned. This error may also be
76 returned under implementation-defined conditions.
77 ENOSPC There was no free space remaining on the device containing the
79 file.
80 EPIPE An attempt is made to write to a pipe or FIFO that is not open
82 for reading by any process. A SIGPIPE signal shall also be sent
83 to the thread.
84 The fputwc() function may fail if:
86 ENOMEM Insufficient storage space is available.
88 ENXIO A request was made of a nonexistent device, or the request was
90 outside the capabilities of the device.
91 The following sections are informative.
93
95 None.
96
98 None.
99
101 None.
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104 None.
105
107 Section 2.5, Standard I/O Streams, ferror(), fopen(), setbuf(),
108 ulimit()
109 The Base Definitions volume of POSIX.1‐2017, <stdio.h>, <wchar.h>
111
113 Portions of this text are reprinted and reproduced in electronic form
114 from IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
115 table Operating System Interface (POSIX), The Open Group Base Specifi‐
116 cations Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of
117 Electrical and Electronics Engineers, Inc and The Open Group. In the
118 event of any discrepancy between this version and the original IEEE and
119 The Open Group Standard, the original IEEE and The Open Group Standard
120 is the referee document. The original Standard can be obtained online
121 at http://www.opengroup.org/unix/online.html .
122 Any typographical or formatting errors that appear in this page are
124 most likely to have been introduced during the conversion of the source
125 files to man page format. To report such errors, see https://www.ker‐
126 nel.org/doc/man-pages/reporting_bugs.html .
127IEEE/The Open Group 2017 FPUTWC(3P)