SCTF2014 MISC100

keypresssignal.c

#include <stdio.h>
#include <sys/types.h>
#include <signal.h>
#include <stdlib.h>
#include <err.h>
#include <termios.h>


int main(int argc, char *argv[])
{
	struct termios info;
	tcgetattr(0, &info);          /* get current terminal attirbutes; 0 is the file descriptor for stdin */
	info.c_lflag &= ~ICANON;      /* disable canonical mode */
	info.c_cc[VMIN] = 1;          /* wait until at least one keystroke available */
	info.c_cc[VTIME] = 0;         /* no timeout */
	tcsetattr(0, TCSANOW, &info); /* set immediately */

	int pid = atoi(argv[1]);
	printf("pid: %d\n", pid);
	int c;
	while ((c = getchar()) != -1)
		if (kill(pid, c) == -1)
			warn("kill");
	return 0;
}