5

     6

#include "evfuse.h"

     8

     9

struct evfuse {

    10

    // the /dev/fuse fd/channel that we get from fuse_mount

    11

    struct fuse_chan *chan;

    12

    13

    // the session that we use to process the fuse stuff

    14

    struct fuse_session *session;

    15

    16

    // the event that we use to receive requests

    17

    struct event *ev;

    18

    19

    // what our receive-message length is

    20

    size_t recv_size;

    21

    22

    // the buffer that we use to receive events

    23

    char *recv_buf;

    24

};

    25

    26

static void _evfuse_ev_read (evutil_socket_t fd, short what, void *arg) {

    27

    struct evfuse *ctx = arg;

    29

    int res;

    30

    31

    // loop until we complete a recv

    32

    do {

    33

        // a new fuse_req is available

    34

        res = fuse_chan_recv(&ch, ctx->recv_buf, ctx->recv_size);

    35

    } while (res == -EINTR);

    36

    37

    if (res == 0)

    38

        ERROR("fuse_chan_recv gave EOF");

    39

    40

    if (res < 0 && res != -EAGAIN)

    41

        ERROR("fuse_chan_recv failed: %s", strerror(-res));

    42

    43

    if (res > 0) {

    46

        // received a fuse_req, so process it

    47

        fuse_session_process(ctx->session, ctx->recv_buf, res, ch);

    48

    }

    49

    50

    // reschedule

    51

    if (event_add(ctx->ev, NULL))

    52

        PERROR("event_add");

    53

    54

    // ok, wait for the next event

    55

    return;

    56

    57

error:

    58

    // XXX: fail

    59

    FATAL("no error handling yet...");

    60

}

    61

    62

struct evfuse *evfuse_new (struct event_base *evbase, struct fuse_args *args, struct fuse_lowlevel_ops *llops, void *cb_data) {

    63

    struct evfuse *ctx = NULL;

    64

    char *mountpoint;

    65

    int multithreaded, foreground;

    66

    67

    // allocate our context

    69

        ERROR("calloc");

    70

    71

    // parse the commandline for the mountpoint

    72

    if (fuse_parse_cmdline(args, &mountpoint, &multithreaded, &foreground) == -1)

    73

        ERROR("fuse_parse_cmdline");

    74

    75

    // mount it

    76

    if ((ctx->chan = fuse_mount(mountpoint, args)) == NULL)

    77

        PERROR("fuse_mount_common");

    78

    79

    // the receive buffer stufff

    80

    ctx->recv_size = fuse_chan_bufsize(ctx->chan);

    81

    82

    // allocate the recv buffer

    83

    if ((ctx->recv_buf = malloc(ctx->recv_size)) == NULL)

    84

        ERROR("malloc");

    85

    86

    // allocate a low-level session

    87

    if ((ctx->session = fuse_lowlevel_new(args, llops, sizeof(*llops), cb_data)) == NULL)

    88

        PERROR("fuse_lowlevel_new");

    89

    90

    // add the channel to the session

    91

    // this isn't strictly necessary, but let's do it anyways

    92

    fuse_session_add_chan(ctx->session, ctx->chan);

    93

    94

    // now, we can start listening for events on the channel

    95

    if ((ctx->ev = event_new(evbase, fuse_chan_fd(ctx->chan), EV_READ, &_evfuse_ev_read, ctx)) == NULL)

    96

        ERROR("event_new");

    97

    98

    if (event_add(ctx->ev, NULL))

    99

        PERROR("event_add");

   100

   101

    // and then we wait

   103

   104

error:

   105

    free(ctx);

   106

   107

    return NULL;

   108

}