trusty (3) fputc.3posix.gz

NAME

       fputc - put a byte on a stream

SYNOPSIS

       #include <stdio.h>

       int fputc(int c, FILE *stream);

DESCRIPTION

       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  st_ctime and st_mtime fields 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 abort().

RETURN VALUE

       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 error.

ERRORS

       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 process 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 process' file size limit.

       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 process is neither ignoring
              nor blocking 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

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       ferror() , fopen() , getrlimit() , putc() , puts() , setbuf() , ulimit() , the Base Definitions volume of
       IEEE Std 1003.1-2001, <stdio.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003 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 .