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fflush(3c)

fflush(3C)               Standard C Library Functions               fflush(3C)

NAME
       fflush - flush a stream

SYNOPSIS
       #include <stdio.h>

       int fflush(FILE *stream);

DESCRIPTION
       If  stream  points to an output stream or an update stream in which the
       most recent operation was not input, fflush() causes any unwritten data
       for that stream to be  written  to  the  file,  and  the  st_ctime  and
       st_mtime fields of the underlying file are marked for update.


       If  stream points to an input stream or an update stream into which the
       most recent operation was input, that stream is flushed if it is  seek‐
       able  and  is not already at end-of-file. Flushing an input stream dis‐
       cards any buffered input and adjusts the file  pointer  such  that  the
       next  input  operation  accesses  the  byte  after the last one read. A
       stream is seekable if the underlying file is not a pipe, FIFO,  socket,
       or TTY device.


       If  stream is a null pointer, fflush() performs this flushing action on
       all streams for which the behavior is defined above.


       An input stream, seekable or non-seekable, can be flushed by explicitly
       calling fflush() with a non-null argument specifying that stream.

RETURN VALUES
       Upon successful completion, fflush() returns 0. Otherwise,  it  returns
       EOF and sets errno to indicate the error.

ERRORS
       The fflush() function will fail if:

       EAGAIN    The O_NONBLOCK flag is set for the file descriptor underlying
                 stream  and  the process would be delayed in the write opera‐
                 tion.


       EBADF     The file descriptor underlying stream is not valid.


       EFBIG     An attempt was made to write a file that exceeds the  maximum
                 file  size or the process's file size limit; or the file is a
                 regular file and an attempt was made to write  at  or  beyond
                 the offset maximum associated with the corresponding stream.


       EINTR     The fflush() function was interrupted by a signal.


       EIO       The  process  is  a  member of a background process group at‐
                 tempting 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.


       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  will  also
                 be sent to the calling process.



       The fflush() function may fail if:

       ENXIO    A  request  was  made of a non-existent device, or the request
                was beyond the limits of the device.


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE  TYPEAT‐
       TRIBUTE  VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe _ Stan‐
       dardSee standards(7).


SEE ALSO
       getrlimit(2), ulimit(2), attributes(7), standards(7)

Oracle Solaris 11.4               1 Nov 2003                        fflush(3C)
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