Upstream | cc2ee17 | 1970-01-12 13:46:40 +0000 | [diff] [blame^] | 1 | /** |
| 2 | * @file op_deviceio.c |
| 3 | * Reading from a special device |
| 4 | * |
| 5 | * @remark Copyright 2002 OProfile authors |
| 6 | * @remark Read the file COPYING |
| 7 | * |
| 8 | * @author John Levon |
| 9 | * @author Philippe Elie |
| 10 | */ |
| 11 | |
| 12 | #include "op_deviceio.h" |
| 13 | |
| 14 | #include <sys/types.h> |
| 15 | #include <fcntl.h> |
| 16 | |
| 17 | #include <stdio.h> |
| 18 | #include <stdlib.h> |
| 19 | #include <string.h> |
| 20 | #include <errno.h> |
| 21 | |
| 22 | fd_t op_open_device(char const * name) |
| 23 | { |
| 24 | return open(name, O_RDONLY); |
| 25 | } |
| 26 | |
| 27 | |
| 28 | ssize_t op_read_device(fd_t devfd, void * buf, size_t size) |
| 29 | { |
| 30 | ssize_t count; |
| 31 | |
| 32 | lseek(devfd, 0, SEEK_SET); |
| 33 | |
| 34 | count = read(devfd, buf, size); |
| 35 | |
| 36 | if (count < 0 && errno != EINTR && errno != EAGAIN) { |
| 37 | perror("oprofiled:op_read_device: "); |
| 38 | exit(EXIT_FAILURE); |
| 39 | } |
| 40 | |
| 41 | return count; |
| 42 | } |