| David 'Digit' Turner | defd162 | 2010-09-26 22:29:14 +0200 | [diff] [blame] | 1 | #include <sys/eventfd.h> |
| 2 | #include <unistd.h> |
| 3 | |
| 4 | /* We duplicate the GLibc error semantics, which are poorly defined |
| 5 | * if the read() or write() does not return the proper number of bytes. |
| 6 | */ |
| 7 | int eventfd_read(int fd, eventfd_t *counter) |
| 8 | { |
| 9 | int ret = read(fd, counter, sizeof(*counter)); |
| 10 | |
| 11 | if (ret == sizeof(*counter)) |
| 12 | return 0; |
| 13 | |
| 14 | return -1; |
| 15 | } |
| 16 | |
| 17 | int eventfd_write(int fd, eventfd_t counter) |
| 18 | { |
| 19 | int ret = write(fd, &counter, sizeof(counter)); |
| 20 | |
| 21 | if (ret == sizeof(counter)) |
| 22 | return 0; |
| 23 | |
| 24 | return -1; |
| 25 | } |