rb_reserved_fd_p   64 ext/socket/init.c     if (!is_socket(fd) || rb_reserved_fd_p(fd)) {
rb_reserved_fd_p  561 include/ruby/intern.h int rb_reserved_fd_p(int fd);
rb_reserved_fd_p  567 include/ruby/intern.h #define RB_RESERVED_FD_P(fd) rb_reserved_fd_p(fd)
rb_reserved_fd_p 7612 io.c               if (rb_reserved_fd_p(fd)) {
rb_reserved_fd_p  297 process.c          if (rb_reserved_fd_p(fd)) { /* async-signal-safe */