Linux Input 子系统测试代码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>  
#include <errno.h>  
#include <time.h>  
#include <linux/input.h>  

struct input_event event; 

int main(int argc, char **argv)  
{  
        char          name[64];           /* RATS: Use ok, but could be better */  
        char          buf[256] = { 0, };  /* RATS: Use ok */  
        unsigned char mask[EV_MAX/8 + 1]; /* RATS: Use ok */  
        int           version;  
        int           fd = 0;  
        int           rc;  
        int           i, j;  
        char          *tmp;  

#define test_bit(bit) (mask[(bit)/8] & (1 << ((bit)%8)))  

        for (i = 0; i < 32; i++) {  
                sprintf(name, "/dev/input/event%d", i);  
                if ((fd = open(name, O_RDONLY, 0)) >= 0) {  
                        ioctl(fd, EVIOCGVERSION, &version);  
                        ioctl(fd, EVIOCGNAME(sizeof(buf)), buf);  
                        ioctl(fd, EVIOCGBIT(0, sizeof(mask)), mask);  
                        printf("%s\n", name);  
                        printf("    evdev version: %d.%d.%d\n",  
                                version >> 16, (version >> 8) & 0xff, version & 0xff);  
                        printf("    name: %s\n", buf);  
                        printf("    features:");  
                        for (j = 0; j < EV_MAX; j++) {  
                                if (test_bit(j)) {  
                                        const char *type = "unknown";  
                                        switch(j) {  
                                        case EV_KEY: type = "keys/buttons"; break;  
                                        case EV_REL: type = "relative";     break;  
                                        case EV_ABS: type = "absolute";     break;  
                                        case EV_MSC: type = "reserved";     break;  
                                        case EV_LED: type = "leds";         break;  
                                        case EV_SND: type = "sound";        break;  
                                        case EV_REP: type = "repeat";       break;  
                                        case EV_FF:  type = "feedback";     break;  
                                        }  
                                        printf(" %s", type);  
                                }  
                        }  
                        printf("\n");  
                        close(fd);  
                }  
        }  

        if (argc > 1) {  
                sprintf(name, "/dev/input/event%d", atoi(argv[1]));  
                if ((fd = open(name, O_RDWR, 0)) >= 0) {  
                        printf("%s: open, fd = %d\n", name, fd);  
                        for (i = 0; i < LED_MAX; i++) {  
                                event.time.tv_sec  = time(0);  
                                event.time.tv_usec = 0;  
                                event.type         = EV_LED;  
                                event.code         = i;  
                                event.value        = 0;  
                                write(fd, &event, sizeof(event));  
                        }  

                        while ((rc = read(fd, &event, sizeof(event))) > 0) {  
                                printf("%-24.24s.%06lu type 0x%04x; code 0x%04x;"  
                                        " value 0x%08x; ",  
                                        ctime(&event.time.tv_sec),  
                                        event.time.tv_usec,  
                                        event.type, event.code, event.value);  
                                switch (event.type) {  
                                case EV_KEY:  
                                        if (event.code > BTN_MISC) {  
                                                printf("Button %d %s",  
                                                        event.code & 0xff,  
                                                        event.value ? "press" : "release");  
                                        } else {  
                                                printf("Key %d (0x%x) %s",  
                                                        event.code & 0xff,  
                                                        event.code & 0xff,  
                                                        event.value ? "press" : "release");  
                                        }  
                                        break;  
                                case EV_REL:  
                                        switch (event.code) {  
                                        case REL_X:      tmp = "X";       break;  
                                        case REL_Y:      tmp = "Y";       break;  
                                        case REL_HWHEEL: tmp = "HWHEEL";  break;  
                                        case REL_DIAL:   tmp = "DIAL";    break;  
                                        case REL_WHEEL:  tmp = "WHEEL";   break;  
                                        case REL_MISC:   tmp = "MISC";    break;  
                                        default:         tmp = "UNKNOWN"; break;  
                                        }  
                                        printf("Relative %s %d", tmp, event.value);  
                                        break;  
                                case EV_ABS:  
                                        switch (event.code) {  
                                        case ABS_X:        tmp = "X";        break;  
                                        case ABS_Y:        tmp = "Y";        break;  
                                        case ABS_Z:        tmp = "Z";        break;  
                                        case ABS_RX:       tmp = "RX";       break;  
                                        case ABS_RY:       tmp = "RY";       break;  
                                        case ABS_RZ:       tmp = "RZ";       break;  
                                        case ABS_THROTTLE: tmp = "THROTTLE"; break;  
                                        case ABS_RUDDER:   tmp = "RUDDER";   break;  
                                        case ABS_WHEEL:    tmp = "WHEEL";    break;  
                                        case ABS_GAS:      tmp = "GAS";      break;  
                                        case ABS_BRAKE:    tmp = "BRAKE";    break;  
                                        case ABS_HAT0X:    tmp = "HAT0X";    break;  
                                        case ABS_HAT0Y:    tmp = "HAT0Y";    break;  
                                        case ABS_HAT1X:    tmp = "HAT1X";    break;  
                                        case ABS_HAT1Y:    tmp = "HAT1Y";    break;  
                                        case ABS_HAT2X:    tmp = "HAT2X";    break;  
                                        case ABS_HAT2Y:    tmp = "HAT2Y";    break;  
                                        case ABS_HAT3X:    tmp = "HAT3X";    break;  
                                        case ABS_HAT3Y:    tmp = "HAT3Y";    break;  
                                        case ABS_PRESSURE: tmp = "PRESSURE"; break;  
                                        case ABS_DISTANCE: tmp = "DISTANCE"; break;  
                                        case ABS_TILT_X:   tmp = "TILT_X";   break;  
                                        case ABS_TILT_Y:   tmp = "TILT_Y";   break;  
                                        case ABS_MISC:     tmp = "MISC";     break;  
                                        default:           tmp = "UNKNOWN";  break;  
                                        }  
                                        printf("Absolute %s %d", tmp, event.value);  
                                        break;  
                                case EV_MSC: printf("Misc"); break;  
                                case EV_LED: printf("Led");  break;  
                                case EV_SND: printf("Snd");  break;  
                                case EV_REP: printf("Rep");  break;  
                                case EV_FF:  printf("FF");   break;  
                                                         break;  
                                }  
                                printf("\n");  
                        }  
                        printf("rc = %d, (%s)\n", rc, strerror(errno));  
                        close(fd);  
                }  
        }  
        return 0;  
}


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