anonymous / readinput_c.c secret

Created March 02, 2012


    
    View readinput_c.c 
  
  
      readinput_c.c
    
    
        Raw
      
    
    File suppressed. Click to show.
  
  
            1
            2
            3
            4
            5
            6
            7
            8
            9
            10
            11
            12
            13
            14
            15
            16
            17
            18
            19
            20
            21
            22
            23
            24
            25
            26
            27
            28
            29
            30
            31
            32
            33
            34
            35
            36
            37
            38
            39
            40
            41
            42
            43
            44
            45
            46
            47
            48
            49
            50
            51
            52
            53
            54
            55
            56
            57
            58
            59
            60
            61
            62
            63
            64
            65
            66
            67
            68
            69
            70
            71
            72
            73
            74
            75
            76
            77
            78
            79
            80
            81
            82
            83
            84
            85
            86
            87
            88
            89
            90
          
          
            #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <dirent.h>
#include <linux/input.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/select.h>
#include <sys/time.h>
#include <termios.h>
#include <signal.h>
#include <ruby.h>
#include <poll.h>
 
 
static VALUE t_init(VALUE self, VALUE device)
{
    int k_fd;
    int m_fd;
    char * path = RSTRING_PTR(device);
    if ((k_fd = open (path, O_RDONLY)) == -1)
        rb_raise(rb_eIOError, "Cannot open device %s", path);
    rb_iv_set(self, "@fd", INT2FIX(k_fd));
    return self;
}
 
static VALUE t_read(VALUE self)
{
    int fd = FIX2INT(rb_iv_get(self, "@fd"));
 
    int retval;
    struct pollfd rfds[1] =
    {
        {fd, POLLIN, 0}
    };
 
 
    retval = poll(rfds, 1, -1);
 
    if (retval == -1)
        rb_raise(rb_eIOError, "Poll error");
    else if (!retval)
        rb_raise(rb_eIOError, "No data");
 
    if (!(rfds[0].revents & POLLIN))
        rb_raise(rb_eIOError, "No descriptor ready");
 
    struct input_event ev[64];
    size_t size = sizeof(struct input_event);
    size_t maxSize = sizeof(ev);
    size_t readSize;
 
    if ((readSize = read(fd, ev, maxSize)) < size)
        rb_raise(rb_eIOError, "Cannot read on device");
 
    size_t i;
    for(i = 0; i < readSize / size; i++)
    {
        struct input_event *event = ev + i;
        printf("%d:%d", event->type, event->code);
        if (event->type == EV_KEY)
        {
            VALUE result = rb_funcall(self,
                                      rb_intern("create_event"),
                                      4,
                                      UINT2NUM(event->type),
                                      UINT2NUM(event->code),
                                      INT2NUM(event->value),
                                      rb_time_new(event->time.tv_sec, event->time.tv_usec));
            return result;
        }
    }
 
    return Qnil;
}
 
VALUE mReadInput;
VALUE cReader;
 
void Init_readinput_c()
{
    mReadInput = rb_define_module("ReadInput");
    cReader = rb_define_class_under(mReadInput, "Reader", rb_cObject);
    rb_define_method(cReader, "initialize", t_init, 1);
    rb_define_method(cReader, "read", t_read, 0);
}