A simple routine to do connection counting. This returns 1 on success * and 0 on failure, with errno also being set if the open() failed (errno * will be 0 if the lock request failed). */
| 24 | * and 0 on failure, with errno also being set if the open() failed (errno |
| 25 | * will be 0 if the lock request failed). */ |
| 26 | int claim_connection(char *fname, int max_connections) |
| 27 | { |
| 28 | int fd, i; |
| 29 | |
| 30 | if (max_connections == 0) |
| 31 | return 1; |
| 32 | |
| 33 | if ((fd = open(fname, O_RDWR|O_CREAT, 0600)) < 0) |
| 34 | return 0; |
| 35 | |
| 36 | /* Find a free spot. */ |
| 37 | for (i = 0; i < max_connections; i++) { |
| 38 | if (lock_range(fd, i*4, 4)) |
| 39 | return 1; |
| 40 | } |
| 41 | |
| 42 | close(fd); |
| 43 | |
| 44 | /* A lock failure needs to return an errno of 0. */ |
| 45 | errno = 0; |
| 46 | return 0; |
| 47 | } |
no test coverage detected