1FPUTC(3P)                  POSIX Programmer's Manual                 FPUTC(3P)
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PROLOG

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.
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11

NAME

13       fputc — put a byte on a stream
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SYNOPSIS

16       #include <stdio.h>
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18       int fputc(int c, FILE *stream);
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DESCRIPTION

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.
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26       The  fputc() function shall write the byte specified by c (converted to
27       an unsigned char) to the output stream pointed to  by  stream,  at  the
28       position  indicated  by  the associated file-position indicator for the
29       stream (if defined), and shall advance the indicator appropriately.  If
30       the  file  cannot  support  positioning  requests, or if the stream was
31       opened with append mode, the byte  shall  be  appended  to  the  output
32       stream.
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34       The  last  data  modification and last file status change timestamps of
35       the file shall be marked for update between the successful execution of
36       fputc()  and  the  next  successful completion of a call to fflush() or
37       fclose() on the same stream or a call to exit() or abort().
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RETURN VALUE

40       Upon successful completion, fputc() shall return the value it has writ‐
41       ten. Otherwise, it shall return EOF, the error indicator for the stream
42       shall be set, and errno shall be set to indicate the error.
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ERRORS

45       The fputc() function shall fail if either the stream is  unbuffered  or
46       the stream's buffer needs to be flushed, and:
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48       EAGAIN The  O_NONBLOCK  flag  is set for the file descriptor underlying
49              stream and the thread would be delayed in the write operation.
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51       EBADF  The file descriptor  underlying  stream  is  not  a  valid  file
52              descriptor open for writing.
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54       EFBIG  An  attempt was made to write to a file that exceeds the maximum
55              file size.
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57       EFBIG  An attempt was made to write to a file  that  exceeds  the  file
58              size limit of the process.
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60       EFBIG  The  file  is a regular file and an attempt was made to write at
61              or beyond the offset maximum.
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63       EINTR  The write operation was terminated due to the receipt of a  sig‐
64              nal, and no data was transferred.
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66       EIO    A physical I/O error has occurred, or the process is a member of
67              a background process group attempting to write to  its  control‐
68              ling terminal, TOSTOP is set, the calling thread is not blocking
69              SIGTTOU, the process is not ignoring SIGTTOU,  and  the  process
70              group  of  the  process  is  orphaned.   This  error may also be
71              returned under implementation-defined conditions.
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73       ENOSPC There was no free space remaining on the device  containing  the
74              file.
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76       EPIPE  An  attempt  is 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.
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80       The fputc() function may fail if:
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82       ENOMEM Insufficient storage space is available.
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84       ENXIO  A  request  was made of a nonexistent device, or the request was
85              outside the capabilities of the device.
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87       The following sections are informative.
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EXAMPLES

90       None.
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APPLICATION USAGE

93       None.
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RATIONALE

96       None.
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FUTURE DIRECTIONS

99       None.
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SEE ALSO

102       Section 2.5, Standard  I/O  Streams,  ferror(),  fopen(),  getrlimit(),
103       putc(), puts(), setbuf(), ulimit()
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105       The Base Definitions volume of POSIX.1‐2008, <stdio.h>
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COPYRIGHT

108       Portions  of  this text are reprinted and reproduced in electronic form
109       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
110       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
111       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
112       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
113       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
114       event of any discrepancy between this version and the original IEEE and
115       The Open Group Standard, the original IEEE and The Open Group  Standard
116       is  the  referee document. The original Standard can be obtained online
117       at http://www.unix.org/online.html .
118
119       Any typographical or formatting errors that appear  in  this  page  are
120       most likely to have been introduced during the conversion of the source
121       files to man page format. To report such errors,  see  https://www.ker‐
122       nel.org/doc/man-pages/reporting_bugs.html .
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126IEEE/The Open Group                  2013                            FPUTC(3P)