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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <wait.h>
#include <string.h>
volatile sig_atomic_t sig = 0;
char *cmd1[] = {"nc", "-l", "12345", NULL};
char *cmd2[] = {"nc", "-l", "12346", NULL};
void
handle_sig(int _sig, siginfo_t *siginfo, void *ucontext)
{
sig = _sig;
}
int
main(int argc, char **argv)
{
int p1[2], p2[2];
pid_t pid1, pid2;
struct sigaction act;
memset(&act, 0, sizeof(act));
act.sa_sigaction = &handle_sig;
act.sa_flags = SA_SIGINFO;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
sigaction(SIGHUP, &act, NULL);
pipe(p1);
pipe(p2);
switch ((pid1 = fork())) {
case 0:
close(0);
close(1);
dup2(p1[0], 0);
dup2(p2[1], 1);
execvp(cmd1[0], cmd1);
break;
default:
break;
}
switch ((pid2 = fork())) {
case 0:
close(0);
close(1);
dup2(p2[0], 0);
dup2(p1[1], 1);
execvp(cmd2[0], cmd2);
break;
default:
break;
}
while (wait(NULL) != -1 || errno == EINTR) {
if (sig != 0) {
kill(pid1, sig);
kill(pid2, sig);
sig = 0;
}
}
return 0;
}
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