1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
/*
* Copyright (c) 1990, 2007 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
FUNCTION
<<fclose>>---close a file
INDEX
fclose
INDEX
_fclose_r
ANSI_SYNOPSIS
#include <stdio.h>
int fclose(FILE *<[fp]>);
int _fclose_r(struct _reent *<[reent]>, FILE *<[fp]>);
TRAD_SYNOPSIS
#include <stdio.h>
int fclose(<[fp]>)
FILE *<[fp]>;
int fclose(<[fp]>)
struct _reent *<[reent]>
FILE *<[fp]>;
DESCRIPTION
If the file or stream identified by <[fp]> is open, <<fclose>> closes
it, after first ensuring that any pending data is written (by calling
<<fflush(<[fp]>)>>).
The alternate function <<_fclose_r>> is a reentrant version.
The extra argument <[reent]> is a pointer to a reentrancy structure.
RETURNS
<<fclose>> returns <<0>> if successful (including when <[fp]> is
<<NULL>> or not an open file); otherwise, it returns <<EOF>>.
PORTABILITY
<<fclose>> is required by ANSI C.
Required OS subroutines: <<close>>, <<fstat>>, <<isatty>>, <<lseek>>,
<<read>>, <<sbrk>>, <<write>>.
*/
#include <_ansi.h>
#include <reent.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/lock.h>
#include "local.h"
int
_DEFUN(_fclose_r, (rptr, fp),
struct _reent *rptr _AND
register FILE * fp)
{
int r;
if (fp == NULL)
return (0); /* on NULL */
__sfp_lock_acquire ();
CHECK_INIT (rptr, fp);
_flockfile (fp);
if (fp->_flags == 0) /* not open! */
{
_funlockfile (fp);
__sfp_lock_release ();
return (0);
}
/* Unconditionally flush to allow special handling for seekable read
files to reposition file to last byte processed as opposed to
last byte read ahead into the buffer. */
r = fflush (fp);
if (fp->_close != NULL && (*fp->_close) (fp->_cookie) < 0)
r = EOF;
if (fp->_flags & __SMBF)
_free_r (rptr, (char *) fp->_bf._base);
if (HASUB (fp))
FREEUB (rptr, fp);
if (HASLB (fp))
FREELB (rptr, fp);
fp->_flags = 0; /* release this FILE for reuse */
_funlockfile (fp);
#ifndef __SINGLE_THREAD__
__lock_close_recursive (fp->_lock);
#endif
__sfp_lock_release ();
return (r);
}
#ifndef _REENT_ONLY
int
_DEFUN(fclose, (fp),
register FILE * fp)
{
return _fclose_r(_REENT, fp);
}
#endif
|
