Re: [libvirt] [PATCH v2 01/13] util: add APIs for reading/writing from/to rotating files

Add virRotatingFileReader and virRotatingFileWriter objects which allow reading & writing from/to files with automation rotation to N backup files when a size limit is reached. This is useful for guest logging when a guaranteed finite size limit is required. Use of external tools like logrotate is inadequate since it leaves the possibility for guest to DOS the host in between invokations of logrotate. Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com&gt; ---

diff --git a/src/util/virrotatingfile.c b/src/util/virrotatingfile.c new file mode 100644 index 0000000..840b55f --- /dev/null +++ b/src/util/virrotatingfile.c @@ -0,0 +1,608 @@

+ + +/** + * virRotatingFileWriterGetPath: + * @file: the file context + * + * Return the primary file path + */ +const char *virRotatingFileWriterGetPath(virRotatingFileWriterPtr file) +{ + return file->basepath; +} + + +/** + * virRotatingFileWriterGetINode: + * @file: the file context + * + * Return the inode of the file currently being written to + */ +ino_t virRotatingFileWriterGetINode(virRotatingFileWriterPtr file) +{ + return file->entry->inode; +} + + +/** + * virRotatingFileWriterGetOffset: + * @file: the file context + * + * Return the offset at which data is currently being written + */ +off_t virRotatingFileWriterGetOffset(virRotatingFileWriterPtr file) +{ + return file->entry->pos; +}