FileSystem support for posix truncate method
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Key: HADOOP-4109
URL: https://issues.apache.org/jira/browse/HADOOP-4109
Project: Hadoop Core
Issue Type: New Feature
Components: fs
Reporter: Pete Wyckoff
from man truncate:
{code}
int truncate(const char *path, off_t length);
{code}
DESCRIPTION
The truncate and ftruncate functions cause the regular file named by
path or referenced by fd to be truncated to a size of precisely length bytes.
If the file previously was larger than this size, the extra data is
lost. If the file previously was shorter, it is extended, and the extended
part reads as zero bytes.
The file pointer is not changed.
If the size changed, then the ctime and mtime fields for the file are
updated, and suid and sgid mode bits may be cleared.
With ftruncate, the file must be open for writing; with truncate, the
file must be writable.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is
set appropriately.
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