DragonFlyBSD

#include <sys/types.h>

#include <sys/wait.h>

#include <err.h>

#include <errno.h>

#include <signal.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

int

main()

{

        const char *editor = "/usr/bin/vi";

        const char *name;

        pid_t pid, caught;

        int sig;

        int st;

        if (getenv("EDITOR") != NULL)

                editor = getenv("EDITOR");

        if ((name = strrchr(editor, '/')) != NULL)

                ++name;

        else

                name = editor;

        if ((pid = fork()) < 0)

                err(1, "fork");

        if (pid == 0)

                return execlp(editor, name, NULL);

#if 0

        sleep(1);

        killpg(getpgrp(), SIGSTOP);

#endif

        for (;;) {

                caught = waitpid(pid, &st, WUNTRACED);

                warnx("waitpid returned %d\n", caught);

                errno = WEXITSTATUS(st);

                if (caught == -1)

                        return 1;

                else if (WIFSTOPPED(st)) {

                        sig = WSTOPSIG(st);

                        warnx("WSTOPSIG(%d) = %d\n", st, sig);

                        sig = SIGSTOP;

                        raise(sig);

                        warnx("after raise(%d)\n", sig);

                }

                else if (WIFEXITED(st))

                        return errno;

                else

                        return 1;

        }

        return 0;

}