release/src/router/ntfs-3g/libfuse-lite/fuse_session.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 "config.h"
  10 #include "fuse_lowlevel.h"
  11 #include "fuse_lowlevel_compat.h"
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <assert.h>
  17 #include <errno.h>
  18
  19 struct fuse_session {
  20     struct fuse_session_ops op;
  21
  22     void *data;
  23
  24     volatile int exited;
  25
  26     struct fuse_chan *ch;
  27 };
  28
  29 struct fuse_chan {
  30     struct fuse_chan_ops op;
  31
  32     struct fuse_session *se;
  33
  34     int fd;
  35
  36     size_t bufsize;
  37
  38     void *data;
  39 };
  40
  41 struct fuse_session *fuse_session_new(struct fuse_session_ops *op, void *data)
  42 {
  43     struct fuse_session *se = (struct fuse_session *) malloc(sizeof(*se));
  44     if (se == NULL) {
  45         fprintf(stderr, "fuse: failed to allocate session\n");
  46         return NULL;
  47     }
  48
  49     memset(se, 0, sizeof(*se));
  50     se->op = *op;
  51     se->data = data;
  52
  53     return se;
  54 }
  55
  56 void fuse_session_add_chan(struct fuse_session *se, struct fuse_chan *ch)
  57 {
  58     assert(se->ch == NULL);
  59     assert(ch->se == NULL);
  60     se->ch = ch;
  61     ch->se = se;
  62 }
  63
  64 void fuse_session_remove_chan(struct fuse_chan *ch)
  65 {
  66     struct fuse_session *se = ch->se;
  67     if (se) {
  68         assert(se->ch == ch);
  69         se->ch = NULL;
  70         ch->se = NULL;
  71     }
  72 }
  73
  74 struct fuse_chan *fuse_session_next_chan(struct fuse_session *se,
  75                                          struct fuse_chan *ch)
  76 {
  77     assert(ch == NULL || ch == se->ch);
  78     if (ch == NULL)
  79         return se->ch;
  80     else
  81         return NULL;
  82 }
  83
  84 void fuse_session_process(struct fuse_session *se, const char *buf, size_t len,
  85                           struct fuse_chan *ch)
  86 {
  87     se->op.process(se->data, buf, len, ch);
  88 }
  89
  90 void fuse_session_destroy(struct fuse_session *se)
  91 {
  92     if (se->op.destroy)
  93         se->op.destroy(se->data);
  94     if (se->ch != NULL)
  95         fuse_chan_destroy(se->ch);
  96     free(se);
  97 }
  98
  99 void fuse_session_exit(struct fuse_session *se)
 100 {
 101     if (se->op.exit)
 102         se->op.exit(se->data, 1);
 103     se->exited = 1;
 104 }
 105
 106 void fuse_session_reset(struct fuse_session *se)
 107 {
 108     if (se->op.exit)
 109         se->op.exit(se->data, 0);
 110     se->exited = 0;
 111 }
 112
 113 int fuse_session_exited(struct fuse_session *se)
 114 {
 115     if (se->op.exited)
 116         return se->op.exited(se->data);
 117     else
 118         return se->exited;
 119 }
 120
 121 static struct fuse_chan *fuse_chan_new_common(struct fuse_chan_ops *op, int fd,
 122                                 size_t bufsize, void *data)
 123 {
 124     struct fuse_chan *ch = (struct fuse_chan *) malloc(sizeof(*ch));
 125     if (ch == NULL) {
 126         fprintf(stderr, "fuse: failed to allocate channel\n");
 127         return NULL;
 128     }
 129
 130     memset(ch, 0, sizeof(*ch));
 131     ch->op = *op;
 132     ch->fd = fd;
 133     ch->bufsize = bufsize;
 134     ch->data = data;
 135
 136     return ch;
 137 }
 138
 139 struct fuse_chan *fuse_chan_new(struct fuse_chan_ops *op, int fd,
 140                                 size_t bufsize, void *data)
 141 {
 142     return fuse_chan_new_common(op, fd, bufsize, data);
 143 }
 144
 145 int fuse_chan_fd(struct fuse_chan *ch)
 146 {
 147     return ch->fd;
 148 }
 149
 150 size_t fuse_chan_bufsize(struct fuse_chan *ch)
 151 {
 152     return ch->bufsize;
 153 }
 154
 155 void *fuse_chan_data(struct fuse_chan *ch)
 156 {
 157     return ch->data;
 158 }
 159
 160 struct fuse_session *fuse_chan_session(struct fuse_chan *ch)
 161 {
 162     return ch->se;
 163 }
 164
 165 int fuse_chan_recv(struct fuse_chan **chp, char *buf, size_t size)
 166 {
 167     struct fuse_chan *ch = *chp;
 168     return ch->op.receive(chp, buf, size);
 169 }
 170
 171 int fuse_chan_send(struct fuse_chan *ch, const struct iovec iov[], size_t count)
 172 {
 173     return ch->op.send(ch, iov, count);
 174 }
 175
 176 void fuse_chan_destroy(struct fuse_chan *ch)
 177 {
 178     fuse_session_remove_chan(ch);
 179     if (ch->op.destroy)
 180         ch->op.destroy(ch);
 181     free(ch);
 182 }
 183