fputc(3p) — Linux manual page


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

PROLOG         top

       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.

NAME         top

       fputc — put a byte on a stream

SYNOPSIS         top

       #include <stdio.h>

       int fputc(int c, FILE *stream);

DESCRIPTION         top

       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.1‐2017 defers to the ISO C standard.

       The fputc() function shall write the byte specified by c
       (converted to an unsigned char) to the output stream pointed to
       by 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.

       The last data modification and last file status change timestamps
       of the file shall be marked for update between the successful
       execution of fputc() and the next successful completion of a call
       to fflush() or fclose() on the same stream or a call to exit() or

RETURN VALUE         top

       Upon successful completion, fputc() shall return the value it has
       written. Otherwise, it shall return EOF, the error indicator for
       the stream shall be set, and errno shall be set to indicate the

ERRORS         top

       The fputc() function shall fail if either the stream is
       unbuffered or the stream's buffer needs to be flushed, and:

       EAGAIN The O_NONBLOCK flag is set for the file descriptor
              underlying stream and the thread would be delayed in the
              write operation.

       EBADF  The file descriptor underlying stream is not a valid file
              descriptor open for writing.

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

       EFBIG  An attempt was made to write to a file that exceeds the
              file size limit of the process.

       EFBIG  The file is a regular file and an attempt was made to
              write at or beyond the offset maximum.

       EINTR  The write operation was terminated due to the receipt of a
              signal, and no data was transferred.

       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.

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

       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.

       The fputc() function may fail if:

       ENOMEM Insufficient storage space is available.

       ENXIO  A request was made of a nonexistent device, or the request
              was outside the capabilities of the device.

       The following sections are informative.

EXAMPLES         top




RATIONALE         top




SEE ALSO         top

       Section 2.5, Standard I/O Streams, ferror(3p), fopen(3p),
       getrlimit(3p), putc(3p), puts(3p), setbuf(3p), ulimit(3p)

       The Base Definitions volume of POSIX.1‐2017, stdio.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 by the Institute of Electrical and Electronics
       Engineers, Inc and The Open Group.  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.opengroup.org/unix/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 .

IEEE/The Open Group               2017                         FPUTC(3P)

Pages that refer to this page: stdio.h(0p)fprintf(3p)fputs(3p)fwrite(3p)perror(3p)psiginfo(3p)putc(3p)putchar(3p)puts(3p)