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natFileChannelPosix.cc (mapImpl): Extend file, when writing, if it is too short. 

http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=205157
	* gnu/java/nio/channels/natFileChannelPosix.cc (mapImpl): Extend
	file, when writing, if it is too short.

From-SVN: r123447
This commit is contained in:
Tom Tromey 2007-04-03 01:05:50 +00:00 committed by Tom Tromey
parent cb7ad97b41
commit 8854e14c61
2 changed files with 19 additions and 1 deletions
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6
libjava/ChangeLog
View File

@ -1,3 +1,9 @@
2007-04-02 Tom Tromey <tromey@redhat.com>
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=205157
* gnu/java/nio/channels/natFileChannelPosix.cc (mapImpl): Extend
file, when writing, if it is too short.
2007-04-02 Tom Tromey <tromey@redhat.com>
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=233406

14
libjava/gnu/java/nio/channels/natFileChannelPosix.cc
View File

@ -1,7 +1,7 @@
// natFileChannelImplPosix.cc - Native part of FileChannelImpl class.
/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006 Free Software Foundation
/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006, 2007 Free Software Foundation
This file is part of libgcj.
@ -499,6 +499,18 @@ FileChannelImpl::mapImpl (jchar mmode, jlong position, jint size)
{
prot = PROT_READ|PROT_WRITE;
flags = mmode == '+' ? MAP_SHARED : MAP_PRIVATE;
// If the file is too short, we must extend it. While using
// ftruncate() to extend a file is not portable in general, it
// should work on all systems where you can mmap() a file.
struct stat st;
if (fstat (fd, &st) == -1)
throw new IOException (JvNewStringLatin1 (strerror (errno)));
if (position + size > st.st_size)
{
if (ftruncate (fd, position + size) == -1)
throw new IOException (JvNewStringLatin1 (strerror (errno)));
}
}
jint page_size = ::getpagesize();
jint offset = position & ~(page_size-1);