SVr4, 4.3BSD. POSIX.1-2001 describes gettimeofday() but not settimeofday(). POSIX.1-2008 marks gettimeofday() as obsolete, recommending the use of clock_gettime(2) instead.
조이스틱 관련 구조체 및 매크로 내용
우분투 기준 /usr/include/linux/joystick.h 에 존재함.
#ifndef _LINUX_JOYSTICK_H
#define _LINUX_JOYSTICK_H
/*
* Copyright (C) 1996-2000 Vojtech Pavlik
*
* Sponsored by SuSE
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to vojtech@suse.cz, or by paper mail:
* Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
*/
#include "linux/types.h"
#include "linux/input.h"
/*
* Version
*/
#define JS_VERSION 0x020100
/*
* Types and constants for reading from /dev/js
*/
#define JS_EVENT_BUTTON 0x01 /* button pressed/released */
#define JS_EVENT_AXIS 0x02 /* joystick moved */
#define JS_EVENT_INIT 0x80 /* initial state of device */
struct js_event {
__u32 time; /* event timestamp in milliseconds */
__s16 value; /* value */
__u8 type; /* event type */
__u8 number; /* axis/button number */
};
/*
* IOCTL commands for joystick driver
*/
#define JSIOCGVERSION _IOR('j', 0x01, __u32) /* get driver version */
#define JSIOCGAXES _IOR('j', 0x11, __u8) /* get number of axes */
#define JSIOCGBUTTONS _IOR('j', 0x12, __u8) /* get number of buttons */
#define JSIOCGNAME(len) _IOC(_IOC_READ, 'j', 0x13, len) /* get identifier string */
#define JSIOCSCORR _IOW('j', 0x21, struct js_corr) /* set correction values */
#define JSIOCGCORR _IOR('j', 0x22, struct js_corr) /* get correction values */
#define JSIOCSAXMAP _IOW('j', 0x31, __u8[ABS_MAX + 1]) /* set axis mapping */
#define JSIOCGAXMAP _IOR('j', 0x32, __u8[ABS_MAX + 1]) /* get axis mapping */
#define JSIOCSBTNMAP _IOW('j', 0x33, __u16[KEY_MAX - BTN_MISC + 1]) /* set button mapping */
#define JSIOCGBTNMAP _IOR('j', 0x34, __u16[KEY_MAX - BTN_MISC + 1]) /* get button mapping */
/*
* Types and constants for get/set correction
*/
#define JS_CORR_NONE 0x00 /* returns raw values */
#define JS_CORR_BROKEN 0x01 /* broken line */
struct js_corr {
__s32 coef[8];
__s16 prec;
__u16 type;
};
/*
* v0.x compatibility definitions
*/
#define JS_RETURN sizeof(struct JS_DATA_TYPE)
#define JS_TRUE 1
#define JS_FALSE 0
#define JS_X_0 0x01
#define JS_Y_0 0x02
#define JS_X_1 0x04
#define JS_Y_1 0x08
#define JS_MAX 2
#define JS_DEF_TIMEOUT 0x1300
#define JS_DEF_CORR 0
#define JS_DEF_TIMELIMIT 10L
#define JS_SET_CAL 1
#define JS_GET_CAL 2
#define JS_SET_TIMEOUT 3
#define JS_GET_TIMEOUT 4
#define JS_SET_TIMELIMIT 5
#define JS_GET_TIMELIMIT 6
#define JS_GET_ALL 7
#define JS_SET_ALL 8
struct JS_DATA_TYPE {
__s32 buttons;
__s32 x;
__s32 y;
};
struct JS_DATA_SAVE_TYPE_32 {
__s32 JS_TIMEOUT;
__s32 BUSY;
__s32 JS_EXPIRETIME;
__s32 JS_TIMELIMIT;
struct JS_DATA_TYPE JS_SAVE;
struct JS_DATA_TYPE JS_CORR;
};
struct JS_DATA_SAVE_TYPE_64 {
__s32 JS_TIMEOUT;
__s32 BUSY;
__s64 JS_EXPIRETIME;
__s64 JS_TIMELIMIT;
struct JS_DATA_TYPE JS_SAVE;
struct JS_DATA_TYPE JS_CORR;
};
#endif /* _LINUX_JOYSTICK_H */
실험적으로 소스를 짜서 해보니
버튼은 type 1
value는 0(눌리지 않음) 1(눌림)
number는 버튼 번호(1번 버튼은 0번 부터 시작)
X/Y/Z 축은 type 2
좌우는 number 0
앞뒤는 number 1
쓰로틀은 number 2
러더는 number 3
햇좌우 number 5
햇앞뒤 number 6
값이 변하기 전에는 새로운 값은 읽히지 않는 듯 하고,
그런 이유로 예제 파일이 멀티쓰레드로 구성이 된 것으로 생각된다.
프로그래밍을 하다보면 짜증나는 것 중에 하나가 바로 이넘의 Byte Order이다.
Intel CPU가 Little Endian 이다 보니 Big Endian 과 유사한 비트 스트림의 경우에는
순서를 죄다 뒤집어주어야 한다. (어셈블러로 그냥 이런 명령어 하나 좀 만들어 주지 -_-)
uint32_t htonl(uint32_t hostlong);
uint16_t htons(uint16_t hostshort);
uint32_t ntohl(uint32_t netlong);
uint16_t ntohs(uint16_t netshort);
The htonl() function converts the unsigned integer hostlong from host byte order to network byte order.
The htons() function converts the unsigned short integer hostshort from host byte order to network byte order.
The ntohl() function converts the unsigned integer netlong from network byte order to host byte order.
The ntohs() function converts the unsigned short integer netshort from network byte order to host byte order.
On the i80x86 the host byte order is Least Significant Byte first, whereas the network byte order, as used on the Internet, is Most Significant Byte first.
