Re: [Libguestfs] [PATCH nbdkit 2/2] tar: Rewrite the tar plugin (again), this time in C.
On Sun, Jun 28, 2020 at 02:02:51PM +0100, Richard W.M. Jones wrote:
+static void *
+tar_open (int readonly)
+{
+ struct handle *h;
+
+ assert (offset > 0); /* Cannot be zero because of tar header. */
+
+ h = calloc (1, sizeof *h);
+ if (h == NULL) {
+ nbdkit_error ("calloc: %m");
+ return NULL;
+ }
+ h->fd = open (tarfile, (readonly ? O_RDONLY : O_RDWR) | O_CLOEXEC);
+ if (h->fd == -1) {
+ nbdkit_error ("%s: %m", tarfile);
+ free (h);
+ return NULL;
+ }
+
+ return h;
+}
Oops, I forgot to close the file descriptor, so this needs an
accompanying close callback:
static void
tar_close (void *handle)
{
struct handle *h = handle;
close (h->fd);
}
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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