137 lines
3.5 KiB
C
137 lines
3.5 KiB
C
/*
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/*
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FUNCTION
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<<fclose>>---close a file
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INDEX
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fclose
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INDEX
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_fclose_r
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ANSI_SYNOPSIS
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#include <stdio.h>
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int fclose(FILE *<[fp]>);
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int _fclose_r(struct _reent *<[reent]>, FILE *<[fp]>);
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TRAD_SYNOPSIS
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#include <stdio.h>
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int fclose(<[fp]>)
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FILE *<[fp]>;
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int fclose(<[fp]>)
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struct _reent *<[reent]>
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FILE *<[fp]>;
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DESCRIPTION
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If the file or stream identified by <[fp]> is open, <<fclose>> closes
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it, after first ensuring that any pending data is written (by calling
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<<fflush(<[fp]>)>>).
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The alternate function <<_fclose_r>> is a reentrant version.
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The extra argument <[reent]> is a pointer to a reentrancy structure.
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RETURNS
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<<fclose>> returns <<0>> if successful (including when <[fp]> is
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<<NULL>> or not an open file); otherwise, it returns <<EOF>>.
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PORTABILITY
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<<fclose>> is required by ANSI C.
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Required OS subroutines: <<close>>, <<fstat>>, <<isatty>>, <<lseek>>,
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<<read>>, <<sbrk>>, <<write>>.
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*/
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#include <_ansi.h>
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#include <reent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/lock.h>
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#include "local.h"
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int
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_DEFUN(_fclose_r, (rptr, fp),
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struct _reent *rptr _AND
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register FILE * fp)
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{
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int r;
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if (fp == NULL)
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return (0); /* on NULL */
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CHECK_INIT (rptr, fp);
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/* We can't use the _newlib_flockfile_XXX macros here due to the
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interlocked locking with the sfp_lock. */
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#ifdef _STDIO_WITH_THREAD_CANCELLATION_SUPPORT
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int __oldcancel;
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pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &__oldcancel);
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#endif
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_flockfile (fp);
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if (fp->_flags == 0) /* not open! */
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{
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_funlockfile (fp);
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#ifdef _STDIO_WITH_THREAD_CANCELLATION_SUPPORT
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pthread_setcancelstate (__oldcancel, &__oldcancel);
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#endif
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return (0);
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}
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#ifdef _STDIO_BSD_SEMANTICS
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/* BSD and Glibc systems only flush streams which have been written to. */
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r = (fp->_flags & __SWR) ? __sflush_r (rptr, fp) : 0;
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#else
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/* Follow POSIX semantics exactly. Unconditionally flush to allow
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special handling for seekable read files to reposition file to last
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byte processed as opposed to last byte read ahead into the buffer. */
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r = __sflush_r (rptr, fp);
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#endif
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if (fp->_close != NULL && fp->_close (rptr, fp->_cookie) < 0)
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r = EOF;
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if (fp->_flags & __SMBF)
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_free_r (rptr, (char *) fp->_bf._base);
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if (HASUB (fp))
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FREEUB (rptr, fp);
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if (HASLB (fp))
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FREELB (rptr, fp);
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__sfp_lock_acquire ();
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fp->_flags = 0; /* release this FILE for reuse */
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_funlockfile (fp);
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#ifndef __SINGLE_THREAD__
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__lock_close_recursive (fp->_lock);
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#endif
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__sfp_lock_release ();
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#ifdef _STDIO_WITH_THREAD_CANCELLATION_SUPPORT
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pthread_setcancelstate (__oldcancel, &__oldcancel);
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#endif
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return (r);
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}
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#ifndef _REENT_ONLY
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int
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_DEFUN(fclose, (fp),
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register FILE * fp)
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{
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return _fclose_r(_REENT, fp);
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}
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#endif
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