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Account for partial writes when interrupted (from FreeBSD).

This commit is contained in:
christos 2021-07-05 07:26:00 +00:00
parent b13f63840e
commit 28c1b2fc8a
1 changed files with 12 additions and 2 deletions
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14
lib/libc/stdio/fflush.c
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@ -1,4 +1,4 @@
/* $NetBSD: fflush.c,v 1.18 2012/03/27 15:05:42 christos Exp $ */
/* $NetBSD: fflush.c,v 1.19 2021/07/05 07:26:00 christos Exp $ */
/*-
* Copyright (c) 1990, 1993
@ -37,7 +37,7 @@
#if 0
static char sccsid[] = "@(#)fflush.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: fflush.c,v 1.18 2012/03/27 15:05:42 christos Exp $");
__RCSID("$NetBSD: fflush.c,v 1.19 2021/07/05 07:26:00 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
@ -45,6 +45,8 @@ __RCSID("$NetBSD: fflush.c,v 1.18 2012/03/27 15:05:42 christos Exp $");
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "reentrant.h"
#include "local.h"
@ -106,6 +108,14 @@ __sflush(FILE *fp)
for (; n > 0; n -= t, p += t) {
t = (*fp->_write)(fp->_cookie, (char *)p, n);
if (t <= 0) {
/* Reset _p and _w. */
if (p > fp->_p) {
/* Some was written. */
memmove(fp->_p, p, n);
fp->_p += n;
if ((fp->_flags & (__SLBF | __SNBF)) == 0)
fp->_w -= n;
}
fp->_flags |= __SERR;
return EOF;
}