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fuse_mt.c

/*
  FUSE: Filesystem in Userspace
  Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>

  This program can be distributed under the terms of the GNU LGPLv2.
  See the file COPYING.LIB.
*/

#include "fuse_i.h"
#include "fuse_misc.h"
#include "fuse_lowlevel.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <assert.h>

struct procdata {
      struct fuse *f;
      struct fuse_chan *prevch;
      struct fuse_session *prevse;
      fuse_processor_t proc;
      void *data;
};

static void mt_session_proc(void *data, const char *buf, size_t len,
                      struct fuse_chan *ch)
{
      struct procdata *pd = (struct procdata *) data;
      struct fuse_cmd *cmd = *(struct fuse_cmd **) buf;

      (void) len;
      (void) ch;
      pd->proc(pd->f, cmd, pd->data);
}

static void mt_session_exit(void *data, int val)
{
      struct procdata *pd = (struct procdata *) data;
      if (val)
            fuse_session_exit(pd->prevse);
      else
            fuse_session_reset(pd->prevse);
}

static int mt_session_exited(void *data)
{
      struct procdata *pd = (struct procdata *) data;
      return fuse_session_exited(pd->prevse);
}

static int mt_chan_receive(struct fuse_chan **chp, char *buf, size_t size)
{
      struct fuse_cmd *cmd;
      struct procdata *pd = (struct procdata *) fuse_chan_data(*chp);

      assert(size >= sizeof(cmd));

      cmd = fuse_read_cmd(pd->f);
      if (cmd == NULL)
            return 0;

      *(struct fuse_cmd **) buf = cmd;

      return sizeof(cmd);
}

00069 int fuse_loop_mt_proc(struct fuse *f, fuse_processor_t proc, void *data)
{
      int res;
      struct procdata pd;
      struct fuse_session *prevse = fuse_get_session(f);
      struct fuse_session *se;
      struct fuse_chan *prevch = fuse_session_next_chan(prevse, NULL);
      struct fuse_chan *ch;
      struct fuse_session_ops sop = {
            .exit = mt_session_exit,
            .exited = mt_session_exited,
            .process = mt_session_proc,
      };
      struct fuse_chan_ops cop = {
            .receive = mt_chan_receive,
      };

      pd.f = f;
      pd.prevch = prevch;
      pd.prevse = prevse;
      pd.proc = proc;
      pd.data = data;

      se = fuse_session_new(&sop, &pd);
      if (se == NULL)
            return -1;

      ch = fuse_chan_new(&cop, fuse_chan_fd(prevch),
                     sizeof(struct fuse_cmd *), &pd);
      if (ch == NULL) {
            fuse_session_destroy(se);
            return -1;
      }
      fuse_session_add_chan(se, ch);
      res = fuse_session_loop_mt(se);
      fuse_session_destroy(se);
      return res;
}

00108 int fuse_loop_mt(struct fuse *f)
{
      if (f == NULL)
            return -1;

      return fuse_session_loop_mt(fuse_get_session(f));
}

FUSE_SYMVER(".symver fuse_loop_mt_proc,__fuse_loop_mt@");

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