/[rdesktop]/sourceforge.net/trunk/rdesktop/disk.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 787 by astrand, Thu Oct 21 08:28:03 2004 UTC revision 790 by astrand, Thu Oct 28 07:46:39 2004 UTC
# Line 191  ftruncate_growable(int fd, off_t length) Line 191  ftruncate_growable(int fd, off_t length)
191          return 0;          return 0;
192  }  }
193    
194    /* Just like open(2), but if a open with O_EXCL fails, retry with
195       GUARDED semantics. This might be necessary because some filesystems
196       (such as NFS filesystems mounted from a unfsd server) doesn't
197       support O_EXCL. GUARDED semantics are subject to race conditions,
198       but we can live with that.
199    */
200    static int
201    open_weak_exclusive(const char *pathname, int flags, mode_t mode)
202    {
203            int ret;
204            struct stat statbuf;
205    
206            ret = open(pathname, flags, mode);
207            if (ret != -1 || !(flags & O_EXCL))
208            {
209                    /* Success, or not using O_EXCL */
210                    return ret;
211            }
212    
213            /* An error occured, and we are using O_EXCL. In case the FS
214               doesn't support O_EXCL, some kind of error will be
215               returned. Unfortunately, we don't know which one. Linux
216               2.6.8 seems to return 524, but I cannot find a documented
217               #define for this case. So, we'll return only on errors that
218               we know aren't related to O_EXCL. */
219            switch (errno)
220            {
221                    case EACCES:
222                    case EEXIST:
223                    case EINTR:
224                    case EISDIR:
225                    case ELOOP:
226                    case ENAMETOOLONG:
227                    case ENOENT:
228                    case ENOTDIR:
229                            return ret;
230            }
231    
232            /* Retry with GUARDED semantics */
233            if (stat(pathname, &statbuf) != -1)
234            {
235                    /* File exists */
236                    errno = EEXIST;
237                    return -1;
238            }
239            else
240            {
241                    return open(pathname, flags & ~O_EXCL, mode);
242            }
243    }
244    
245  /* Enumeration of devices from rdesktop.c        */  /* Enumeration of devices from rdesktop.c        */
246  /* returns numer of units found and initialized. */  /* returns numer of units found and initialized. */
# Line 334  disk_create(uint32 device_id, uint32 acc Line 384  disk_create(uint32 device_id, uint32 acc
384                          flags |= O_RDONLY;                          flags |= O_RDONLY;
385                  }                  }
386    
387                  handle = open(path, flags, mode);                  handle = open_weak_exclusive(path, flags, mode);
388                  if (handle == -1)                  if (handle == -1)
389                  {                  {
390                          switch (errno)                          switch (errno)
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