terom@1: 
terom@1: #include <errno.h>
terom@1: #include <string.h>
terom@1: #include <stdlib.h>
terom@0: 
terom@0: #include "evfuse.h"
terom@6: #include "lib/log.h"
terom@0: 
terom@0: struct evfuse {
terom@3:     // our mountpoint
terom@3:     char *mountpoint;
terom@3: 
terom@0:     // the /dev/fuse fd/channel that we get from fuse_mount
terom@0:     struct fuse_chan *chan;
terom@0: 
terom@0:     // the session that we use to process the fuse stuff
terom@0:     struct fuse_session *session;
terom@0: 
terom@0:     // the event that we use to receive requests
terom@0:     struct event *ev;
terom@0:     
terom@0:     // what our receive-message length is
terom@0:     size_t recv_size;
terom@0: 
terom@0:     // the buffer that we use to receive events
terom@0:     char *recv_buf;
terom@0: };
terom@0: 
terom@0: static void _evfuse_ev_read (evutil_socket_t fd, short what, void *arg) {
terom@0:     struct evfuse *ctx = arg;
terom@1:     struct fuse_chan *ch = ctx->chan;
terom@0:     int res;
terom@0:     
terom@0:     // loop until we complete a recv
terom@0:     do {
terom@0:         // a new fuse_req is available
terom@0:         res = fuse_chan_recv(&ch, ctx->recv_buf, ctx->recv_size);
terom@0:     } while (res == -EINTR);
terom@0: 
terom@0:     if (res == 0)
terom@0:         ERROR("fuse_chan_recv gave EOF");
terom@0: 
terom@0:     if (res < 0 && res != -EAGAIN)
terom@0:         ERROR("fuse_chan_recv failed: %s", strerror(-res));
terom@0:     
terom@0:     if (res > 0) {
terom@1:         INFO("[evfuse] got %d bytes from /dev/fuse", res);
terom@1: 
terom@0:         // received a fuse_req, so process it
terom@0:         fuse_session_process(ctx->session, ctx->recv_buf, res, ch);
terom@0:     }
terom@0:     
terom@0:     // reschedule
terom@0:     if (event_add(ctx->ev, NULL))
terom@0:         PERROR("event_add");
terom@0: 
terom@0:     // ok, wait for the next event
terom@0:     return;
terom@0: 
terom@0: error:
terom@6:     // fail
terom@6:     evfuse_close(ctx);
terom@0: }
terom@0: 
terom@0: struct evfuse *evfuse_new (struct event_base *evbase, struct fuse_args *args, struct fuse_lowlevel_ops *llops, void *cb_data) {
terom@0:     struct evfuse *ctx = NULL;
terom@0:     int multithreaded, foreground;
terom@0:     
terom@0:     // allocate our context
terom@1:     if ((ctx = calloc(1, sizeof(*ctx))) == NULL)
terom@0:         ERROR("calloc");
terom@0: 
terom@0:     // parse the commandline for the mountpoint
terom@3:     if (fuse_parse_cmdline(args, &ctx->mountpoint, &multithreaded, &foreground) == -1)
terom@0:         ERROR("fuse_parse_cmdline");
terom@0: 
terom@0:     // mount it
terom@3:     if ((ctx->chan = fuse_mount(ctx->mountpoint, args)) == NULL)
terom@0:         PERROR("fuse_mount_common");
terom@0: 
terom@0:     // the receive buffer stufff
terom@0:     ctx->recv_size = fuse_chan_bufsize(ctx->chan);
terom@0: 
terom@0:     // allocate the recv buffer
terom@0:     if ((ctx->recv_buf = malloc(ctx->recv_size)) == NULL)
terom@0:         ERROR("malloc");
terom@0:     
terom@0:     // allocate a low-level session
terom@0:     if ((ctx->session = fuse_lowlevel_new(args, llops, sizeof(*llops), cb_data)) == NULL)
terom@0:         PERROR("fuse_lowlevel_new");
terom@0:     
terom@0:     // add the channel to the session
terom@0:     // this isn't strictly necessary, but let's do it anyways
terom@0:     fuse_session_add_chan(ctx->session, ctx->chan);
terom@0:     
terom@0:     // now, we can start listening for events on the channel
terom@0:     if ((ctx->ev = event_new(evbase, fuse_chan_fd(ctx->chan), EV_READ, &_evfuse_ev_read, ctx)) == NULL)
terom@0:         ERROR("event_new");
terom@0: 
terom@0:     if (event_add(ctx->ev, NULL))
terom@0:         PERROR("event_add");
terom@0: 
terom@0:     // and then we wait
terom@1:     return ctx;
terom@0: 
terom@0: error:
terom@0:     free(ctx);
terom@0: 
terom@0:     return NULL;
terom@0: }
terom@3: 
terom@3: void evfuse_close (struct evfuse *ctx) {
terom@3:     // remove our event
terom@3:     if (event_del(ctx->ev))
terom@3:         PWARNING("event_del");
terom@3: 
terom@3:     // remove the chan
terom@3:     fuse_session_remove_chan(ctx->chan);
terom@3:     
terom@3:     // destroy the session
terom@3:     fuse_session_destroy(ctx->session);
terom@3: 
terom@3:     // unmount
terom@3:     fuse_unmount(ctx->mountpoint, ctx->chan);
terom@3:     
terom@3:     // free
terom@3:     free(ctx->recv_buf);
terom@3:     free(ctx->mountpoint);
terom@3:     free(ctx);
terom@3: }
terom@3: