modified version of felker's init

respawn.c

@@ -0,0 +1,26 @@
+#include <signal.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <spawn.h>
+#include <sys/wait.h>
+#include <time.h>
+
+int main(int argc, char **argv)
+{
+	sigset_t set, old;
+	sigfillset(&set);
+	sigprocmask(SIG_BLOCK, &set, &old);
+
+	posix_spawnattr_t attr;
+	posix_spawnattr_init(&attr);
+	posix_spawnattr_setsigmask(&attr, &old);
+	posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETSID|POSIX_SPAWN_SETSIGMASK);
+
+	for (;;) {
+		extern char **environ;
+		pid_t pid;
+		if (posix_spawn(&pid, argv[1], 0, &attr, argv+1, environ))
+			nanosleep(&(struct timespec){.tv_nsec=100000000}, 0);
+		waitpid(pid, 0, 0);
+	}
+}