fclose man page on DigitalUNIX

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fclose(3)							     fclose(3)

       fclose,	fflush,	 fclose_unlocked,  fflush_unlocked  - Close or flush a

       #include <stdio.h>

       int fclose(
	       FILE *stream ); int fclose_unlocked(
	       FILE *stream ); int fflush(
	       FILE *stream ); int fflush_unlocked(
	       FILE *stream );

       Standard C Library (libc)

       Interfaces documented on this reference page conform to industry	 stan‐
       dards as follows:

       fclose(), fflush():   XSH4.0, XSH4.2, XSH5.0

       Refer  to  the  standards(5)  reference page for more information about
       industry standards and associated tags.

       Specifies the output or update stream.

       The fclose() function writes buffered data to the stream	 specified  by
       the stream parameter, and then closes the associated file. The function
       is automatically called for all open files when the exit() function  is
       invoked.	  Any  unwritten  buffered data for the stream is delivered to
       the host environment to be written to the  file;	 any  unread  buffered
       data  is	 discarded.  The stream is disassociated from the file. If the
       associated buffer was automatically allocated, it is deallocated.   Any
       further	use  of	 the  stream  specified by the stream parameter causes
       undefined behavior.

       The fclose()  function  performs	 the  close()  function	 on  the  file
       descriptor  associated  with  the  stream parameter.  If the stream was
       writable and buffered data was not yet written to the  file,  it	 marks
       the st_ctime and st_mtime fields of the underlying file for update.

       The fflush() function writes any buffered data for the stream specified
       by the stream parameter and leaves the stream open.   If	 stream	 is  a
       null  pointer,  the  fflush() function performs this flushing action on
       all streams for which the behavior was previously defined. The st_ctime
       and st_mtime fields of the underlying file are marked for update.

       [Tru64 UNIX]  The fclose_unlocked() and fflush_unlocked() functions are
       functionally identical to the fclose() and fflush()  functions,	except
       that  fclose_unlocked()	and  fflush_unlocked() may be safely used only
       within a scope that is protected by the flockfile()  and	 funlockfile()
       functions  used	as  a  pair. The caller must ensure that the stream is
       locked before these functions are used.

       Upon successful completion, the fclose(), fflush(),  fclose_unlocked(),
       and  fflush_unlocked() functions return a value of 0 (zero). Otherwise,
       EOF is returned, and errno is set to indicate the error.

       The fclose(), fflush(), fclose_unlocked(), and fflush_unlocked()	 func‐
       tions  set  errno  to the specified value for following conditions: The
       O_NONBLOCK option is set for the file descriptor underlying the	stream
       parameter and the process would be delayed in the write operation.  The
       file descriptor underlying the  stream  parameter  is  not  valid.   An
       attempt	was  made to write a file that exceeds the process's file size
       limit or the maximum file size.	(See the ulimit(3) reference page).

	      The file is a regular file and an attempt was made to  write  at
	      or  beyond  the offset maximum associated with the corresponding
	      stream.  The function was	 interrupted  by  a  signal  that  was
	      caught.	The  TOSTOP tty local mode causes a background process
	      to get a SIGTTOU signal if it attempts to write to the  control‐
	      ling  terminal.	The  SIGTTOU  signal,  if  it is not caught or
	      ignored, will cause the process to block in a stopped state.   A
	      process  in  an  orphaned process group is not allowed to become
	      stopped, since there is no unprivileged process to  unblock  it.
	      This condition only applies to operations on stdio streams asso‐
	      ciated with ttys.

	      [EIO] is also associated with driver errors.  There was no  free
	      space  remaining	on the device containing the file.  An attempt
	      was 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
	      process.	A request was made of  a  nonexistent  device  or  the
	      request was outside the capabilities of the device.

       Functions: close(2), exit(2), fopen(3), setbuf(3)

       Standards: standards(5)

       Network Programmer's Guide


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