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32 * @(#)fflush.c 8.1 (Berkeley) 6/4/93
33 * $FreeBSD: src/lib/libc/stdio/fflush.c,v 1.14 2007/01/09 00:28:06 imp Exp $
34 * $DragonFly: src/lib/libc/stdio/fflush.c,v 1.6 2005/07/23 20:23:05 joerg Exp $
37 #include "namespace.h"
40 #include "un-namespace.h"
41 #include "libc_private.h"
44 #include "priv_stdio.h"
46 static int sflush_locked(FILE *);
49 * Flush a single file, or (if fp is NULL) all files.
58 return (_fwalk(sflush_locked
));
62 * There is disagreement about the correct behaviour of fflush()
63 * when passed a file which is not open for reading. According to
64 * the ISO C standard, the behaviour is undefined.
65 * Under linux, such an fflush returns success and has no effect;
66 * under Windows, such an fflush is documented as behaving instead
68 * Given that applications may be written with the expectation of
69 * either of these two behaviours, the only safe (non-astonishing)
70 * option is to return EBADF and ask that applications be fixed.
72 if ((fp
->pub
._flags
& (__SWR
| __SRW
)) == 0) {
76 retval
= __sflush(fp
);
83 * Flush a single file, or (if fp is NULL) all files.
92 return (_fwalk(sflush_locked
));
93 if ((fp
->pub
._flags
& (__SWR
| __SRW
)) == 0) {
97 retval
= __sflush(fp
);
109 if ((t
& __SWR
) == 0)
112 if ((p
= fp
->_bf
._base
) == NULL
)
115 n
= fp
->pub
._p
- p
; /* write this much */
118 * Set these immediately to avoid problems with longjmp and to allow
119 * exchange buffering (via setvbuf) in user write function.
122 fp
->pub
._w
= t
& (__SLBF
|__SNBF
) ? 0 : fp
->_bf
._size
;
124 for (; n
> 0; n
-= t
, p
+= t
) {
125 t
= _swrite(fp
, (char *)p
, n
);
127 fp
->pub
._flags
|= __SERR
;
135 sflush_locked(FILE *fp
)