typedef struct Exec Exec;

struct Exec {
	char	*path;
	char	**argv;
	char	**environment;

	int		stdin_fd;
	int		stdout_fd;
	int		stderr_fd;

	Channel	*sync;		/* chan(ulong) */
	Channel *error;		/* chan(char*) */
};

int exec_init(Exec **exec);
void exec_done(Exec *exec);
int exec_args(Exec *exec, char *fmt, ...);
int exec_spawn(Exec *exec);

int spawn_exec(Exec *exec);
int spawn(char *fmt, ...);