lib/fuse_mt.c

   1 /*
   2   FUSE: Filesystem in Userspace
   3   Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>
   4
   5   This program can be distributed under the terms of the GNU LGPLv2.
   6   See the file COPYING.LIB.
   7 */
   8
   9 #include "fuse_i.h"
  10 #include "fuse_misc.h"
  11 #include "fuse_lowlevel.h"
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <pthread.h>
  17 #include <assert.h>
  18
  19 struct procdata {
  20         struct fuse *f;
  21         struct fuse_chan *prevch;
  22         struct fuse_session *prevse;
  23         fuse_processor_t proc;
  24         void *data;
  25 };
  26
  27 static void mt_session_proc(void *data, const char *buf, size_t len,
  28                             struct fuse_chan *ch)
  29 {
  30         struct procdata *pd = (struct procdata *) data;
  31         struct fuse_cmd *cmd = *(struct fuse_cmd **) buf;
  32
  33         (void) len;
  34         (void) ch;
  35         pd->proc(pd->f, cmd, pd->data);
  36 }
  37
  38 static void mt_session_exit(void *data, int val)
  39 {
  40         struct procdata *pd = (struct procdata *) data;
  41         if (val)
  42                 fuse_session_exit(pd->prevse);
  43         else
  44                 fuse_session_reset(pd->prevse);
  45 }
  46
  47 static int mt_session_exited(void *data)
  48 {
  49         struct procdata *pd = (struct procdata *) data;
  50         return fuse_session_exited(pd->prevse);
  51 }
  52
  53 static int mt_chan_receive(struct fuse_chan **chp, char *buf, size_t size)
  54 {
  55         struct fuse_cmd *cmd;
  56         struct procdata *pd = (struct procdata *) fuse_chan_data(*chp);
  57
  58         assert(size >= sizeof(cmd));
  59
  60         cmd = fuse_read_cmd(pd->f);
  61         if (cmd == NULL)
  62                 return 0;
  63
  64         *(struct fuse_cmd **) buf = cmd;
  65
  66         return sizeof(cmd);
  67 }
  68
  69 int fuse_loop_mt_proc(struct fuse *f, fuse_processor_t proc, void *data)
  70 {
  71         int res;
  72         struct procdata pd;
  73         struct fuse_session *prevse = fuse_get_session(f);
  74         struct fuse_session *se;
  75         struct fuse_chan *prevch = fuse_session_next_chan(prevse, NULL);
  76         struct fuse_chan *ch;
  77         struct fuse_session_ops sop = {
  78                 .exit = mt_session_exit,
  79                 .exited = mt_session_exited,
  80                 .process = mt_session_proc,
  81         };
  82         struct fuse_chan_ops cop = {
  83                 .receive = mt_chan_receive,
  84         };
  85
  86         pd.f = f;
  87         pd.prevch = prevch;
  88         pd.prevse = prevse;
  89         pd.proc = proc;
  90         pd.data = data;
  91
  92         se = fuse_session_new(&sop, &pd);
  93         if (se == NULL)
  94                 return -1;
  95
  96         ch = fuse_chan_new(&cop, fuse_chan_fd(prevch),
  97                            sizeof(struct fuse_cmd *), &pd);
  98         if (ch == NULL) {
  99                 fuse_session_destroy(se);
 100                 return -1;
 101         }
 102         fuse_session_add_chan(se, ch);
 103         res = fuse_session_loop_mt(se);
 104         fuse_session_destroy(se);
 105         return res;
 106 }
 107
 108 int fuse_loop_mt(struct fuse *f)
 109 {
 110         if (f == NULL)
 111                 return -1;
 112
 113         return fuse_session_loop_mt(fuse_get_session(f));
 114 }
 115
 116 FUSE_SYMVER(".symver fuse_loop_mt_proc,__fuse_loop_mt@");