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.TH FPUTC "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"

.SH PROLOG

This manual page is part of the POSIX Programmer's Manual.

The Linux implementation of this interface may differ (consult

the corresponding Linux manual page for details of Linux behavior),

or the interface may not be implemented on Linux.

.SH NAME

fputc

\(em put a byte on a stream

.SH SYNOPSIS

.LP

.nf

#include <stdio.h>

.P

int fputc(int \fIc\fP, FILE *\fIstream\fP);

.fi

.SH DESCRIPTION

The functionality described on this reference page is aligned with the

ISO\ C standard. Any conflict between the requirements described here and the

ISO\ C standard is unintentional. This volume of POSIX.1\(hy2008 defers to the ISO\ C standard.

.P

The

\fIfputc\fR()

function shall write the byte specified by

.IR c

(converted to an

.BR "unsigned char" )

to the output stream pointed to by

.IR stream ,

at the position indicated by the associated file-position indicator for

the stream (if defined), and shall advance the indicator appropriately.

If the file cannot support positioning requests, or if the stream was

opened with append mode, the byte shall be appended to the output

stream.

.P

The last data modification and last file status change timestamps

of the file shall be marked for update between the successful

execution of

\fIfputc\fR()

and the next successful completion of a call to

\fIfflush\fR()

or

\fIfclose\fR()

on the same stream or a call to

\fIexit\fR()

or

\fIabort\fR().

.SH "RETURN VALUE"

Upon successful completion,

\fIfputc\fR()

shall return the value it has written. Otherwise, it shall return EOF,

the error indicator for the stream shall be set,

and

.IR errno

shall be set to indicate the error.

.SH ERRORS

The

\fIfputc\fR()

function shall fail if either the

.IR stream

is unbuffered or the

.IR stream 's

buffer needs to be flushed, and:

.TP

.BR EAGAIN

The O_NONBLOCK flag is set for the file descriptor underlying

.IR stream

and the thread would be delayed in the write operation.

.TP

.BR EBADF

The file descriptor underlying

.IR stream

is not a valid file descriptor open for writing.

.TP

.BR EFBIG

An attempt was made to write to a file that exceeds the maximum file

size.

.TP

.BR EFBIG

An attempt was made to write to a file that exceeds the file

size limit of the process.

.TP

.BR EFBIG

The file is a regular file and an attempt was made to write at or

beyond the offset maximum.

.TP

.BR EINTR

The write operation was terminated due to the receipt of a signal, and

no data was transferred.

.TP

.BR EIO

A physical I/O error has occurred, or the process is a member of a

background process group attempting to write to its controlling terminal,

TOSTOP is set, the calling thread is not blocking SIGTTOU, the process

is not ignoring SIGTTOU, and the process group of the process is orphaned.

This error may also be returned under implementation-defined conditions.

.TP

.BR ENOSPC

There was no free space remaining on the device containing the file.

.TP

.BR EPIPE

An attempt is 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.

.br

.P

The

\fIfputc\fR()

function may fail if:

.TP

.BR ENOMEM

Insufficient storage space is available.

.TP

.BR ENXIO

A request was made of a nonexistent device, or the request was

outside the capabilities of the device.

.LP

.IR "The following sections are informative."

.SH EXAMPLES

None.

.SH "APPLICATION USAGE"

None.

.SH RATIONALE

None.

.SH "FUTURE DIRECTIONS"

None.

.SH "SEE ALSO"

.IR "Section 2.5" ", " "Standard I/O Streams",

.IR "\fIferror\fR\^(\|)",

.IR "\fIfopen\fR\^(\|)",

.IR "\fIgetrlimit\fR\^(\|)",

.IR "\fIputc\fR\^(\|)",

.IR "\fIputs\fR\^(\|)",

.IR "\fIsetbuf\fR\^(\|)",

.IR "\fIulimit\fR\^(\|)"

.P

The Base Definitions volume of POSIX.1\(hy2008,

.IR "\fB<stdio.h>\fP"

.SH COPYRIGHT

Portions of this text are reprinted and reproduced in electronic form

from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology

-- Portable Operating System Interface (POSIX), The Open Group Base

Specifications Issue 7, Copyright (C) 2013 by the Institute of

Electrical and Electronics Engineers, Inc and The Open Group.

(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .

Any typographical or formatting errors that appear

in this page are most likely

to have been introduced during the conversion of the source files to

man page format. To report such errors, see

https://www.kernel.org/doc/man-pages/reporting_bugs.html .