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 } 43
