dwmguard.c

/*
 *  dwmguard.c
 *  author: Aleksei Kozadaev (2016)
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

#define DWM     "/usr/local/bin/dwm"

int
main(void)
{
    int running = 1, status;
    pid_t pid;

    while (running) {
        pid = fork();
        switch(pid) {
            case -1:
                perror("fork");
                exit(1);
            case 0:
                execl(DWM, DWM, NULL);
                perror("execl");
                exit(1);
        }

        if (wait(&status) < 0) {
            perror("wait");
            exit(1);
        }

        if (WIFEXITED(status)) {
            running = (WEXITSTATUS(status) != 0);
        } else if (WIFSIGNALED(status)) {
            printf("process %d killed: signal %d\n", pid,
                   WTERMSIG(status));
            exit(WTERMSIG(status));
        }
    }

    return EXIT_SUCCESS;
}