gz_open
return gz_open(path, -1, mode);
return gz_open(path, -1, mode);
gz = gz_open(path, fd, mode);
return gz_open(path, -2, mode);
return gz_open(path, -1, mode);
return gz_open(NULL, fd, mode);
extern void *gz_open(int, const char *, char *, int, u_int32_t, int);