kbhit on QNX 6.2

QNX Newsgroups (Archives) qdn.public.qnxrtp.applications
1

Hello,

Does it exist a similar function to “kbhit( )” ( Watcom / QNX 4 ) on Qnx
6.2 ?

  • these function allows to test if a char is available on keyboard without
    block the process -.

thanks

2

Philippe ELSKENS wrote:

Hello,

Does it exist a similar function to “kbhit( )” ( Watcom / QNX 4 ) on Qnx
6.2 ?

  • these function allows to test if a char is available on keyboard without
    block the process -.

Yes, select (which is also available on QNX4 - i.e. it is portable).

Here is a trivial example. Should run unaltered on QNX4 or QNX6.

#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <sys/select.h>

int raw(int fd)
{
struct termios termios_p;

if(tcgetattr( fd, &termios_p ) )
return( -1 );

termios_p.c_cc[VMIN] = 1;
termios_p.c_cc[VTIME] = 0;
termios_p.c_lflag &= ~( ECHO|ICANON|ISIG|ECHOE|ECHOK|ECHONL );

return(tcsetattr( fd, TCSADRAIN, &termios_p));
}

int main()
{
int n,fd=fileno(stdin);
fd_set rdfds;
struct timeval tv;

raw(fd);

tv.tv_sec=0;
tv.tv_usec=250000;

while(1) {
FD_ZERO(&rdfds);
FD_SET(fd, &rdfds);

switch(n=select(fd+1, &rdfds, NULL, NULL, &tv)) {
case -1:
perror(“select”);
exit(EXIT_FAILURE);
case 0:
printf(“I’m not blocked\n”);
break;
default:
if(FD_ISSET(fd, &rdfds)) {
printf(“you hit %c\n”, getchar());
}
break;
}
}

exit(EXIT_SUCCESS);
}