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/*
* This program handles SIGINT and forwards it to another process.
* It is intended to be run as PID 1.
*
* Docker starts processes with "docker run" as PID 1.
* On Linux, the default signal handler for PID 1 ignores any signals.
* Therefore Ctrl-C aka SIGINT is ignored per default.
*/
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
int pid = 0;
void
handle_sigint (int signum)
{
if(pid)
kill(pid, SIGINT);
}
int main(int argc, char *argv[]){
struct sigaction new_action;
int status = -1;
/* Set up the structure to specify the new action. */
new_action.sa_handler = handle_sigint;
sigemptyset (&new_action.sa_mask);
new_action.sa_flags = 0;
sigaction (SIGINT, &new_action, (void*)0);
pid = fork();
if(pid){
wait(&status);
return WEXITSTATUS(status);
}else{
status = execvp(argv[1], &argv[1]);
perror("exec");
return status;
}
}
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