226         pub fd: c_int,
3251     pub fn FD_CLR(fd: c_int, set: *mut fd_set) -> () {
3252         let fd = fd as usize;  localVariable
3254         (*set).fds_bits[fd / size] &= !(1 << (fd % size));
3258     pub fn FD_ISSET(fd: c_int, set: *const fd_set) -> bool {
3259         let fd = fd as usize;  localVariable
3261         return ((*set).fds_bits[fd / size] & (1 << (fd % size))) != 0;
3264     pub fn FD_SET(fd: c_int, set: *mut fd_set) -> () {
3265         let fd = fd as usize;  localVariable
3267         (*set).fds_bits[fd / size] |= 1 << (fd % size);
3583     pub fn fchmod(fd: c_int, mode: mode_t) -> c_int;  in fchmod()
3592     pub fn fdopen(fd: c_int, mode: *const c_char) -> *mut crate::FILE;  in fdopen()
3597     pub fn fcntl(fd: c_int, cmd: c_int, ...) -> c_int;  in fcntl()
3611     pub fn fchown(fd: c_int, owner: crate::uid_t, group: crate::gid_t) -> c_int;  in fchown()
3648     pub fn close(fd: c_int) -> c_int;  in close()
3649     pub fn dup(fd: c_int) -> c_int;  in dup()
3679     pub fn isatty(fd: c_int) -> c_int;  in isatty()
3681     pub fn lseek(fd: c_int, offset: off_t, whence: c_int) -> off_t;  in lseek()
3686     pub fn read(fd: c_int, buf: *mut c_void, count: size_t) -> ssize_t;  in read()
3696     pub fn tcgetpgrp(fd: c_int) -> pid_t;  in tcgetpgrp()
3697     pub fn tcsetpgrp(fd: c_int, pgrp: crate::pid_t) -> c_int;  in tcsetpgrp()
3698     pub fn ttyname(fd: c_int) -> *mut c_char;  in ttyname()
3702     pub fn write(fd: c_int, buf: *const c_void, count: size_t) -> ssize_t;  in write()
3703     pub fn pread(fd: c_int, buf: *mut c_void, count: size_t, offset: off_t) -> ssize_t;  in pread()
3704     pub fn pwrite(fd: c_int, buf: *const c_void, count: size_t, offset: off_t) -> ssize_t;  in pwrite()
3721         fd: c_int,  in mmap()
3731     pub fn fsync(fd: c_int) -> c_int;  in fsync()
3738     pub fn ftruncate(fd: c_int, length: off_t) -> c_int;  in ftruncate()
3744     pub fn flock(fd: c_int, operation: c_int) -> c_int;  in flock()
3872     pub fn fstatvfs(fd: c_int, buf: *mut statvfs) -> c_int;  in fstatvfs()
3903     pub fn tcdrain(fd: c_int) -> c_int;  in tcdrain()
3910     pub fn tcgetattr(fd: c_int, termios: *mut crate::termios) -> c_int;  in tcgetattr()
3911     pub fn tcsetattr(fd: c_int, optional_actions: c_int, termios: *const crate::termios) -> c_int;  in tcsetattr()
3912     pub fn tcflow(fd: c_int, action: c_int) -> c_int;  in tcflow()
3913     pub fn tcflush(fd: c_int, action: c_int) -> c_int;  in tcflush()
3914     pub fn tcgetsid(fd: c_int) -> crate::pid_t;  in tcgetsid()
3915     pub fn tcsendbreak(fd: c_int, duration: c_int) -> c_int;  in tcsendbreak()
3926     pub fn grantpt(fd: c_int) -> c_int;  in grantpt()
3928     pub fn ptsname(fd: c_int) -> *mut c_char;  in ptsname()
3929     pub fn unlockpt(fd: c_int) -> c_int;  in unlockpt()
3931     pub fn fdatasync(fd: c_int) -> c_int;  in fdatasync()
3947     pub fn fstatfs(fd: c_int, buf: *mut statfs) -> c_int;  in fstatfs()
3950     pub fn posix_fadvise(fd: c_int, offset: off_t, len: off_t, advise: c_int) -> c_int;  in posix_fadvise()
3951     pub fn futimens(fd: c_int, times: *const crate::timespec) -> c_int;  in futimens()
3963     pub fn fdopendir(fd: c_int) -> *mut crate::DIR;  in fdopendir()
3975         fd: c_int,  in accept4()
3980     pub fn ptsname_r(fd: c_int, buf: *mut c_char, buflen: size_t) -> c_int;  in ptsname_r()
4018     pub fn fexecve(fd: c_int, argv: *const *const c_char, envp: *const *const c_char) -> c_int;  in fexecve()
4020     pub fn ioctl(fd: c_int, request: c_int, ...) -> c_int;  in ioctl()
4053     pub fn fallocate(fd: c_int, mode: c_int, offset: off_t, len: off_t) -> c_int;  in fallocate()
4054     pub fn posix_fallocate(fd: c_int, offset: off_t, len: off_t) -> c_int;  in posix_fallocate()
4055     pub fn readahead(fd: c_int, offset: off64_t, count: size_t) -> ssize_t;  in readahead()
4056     pub fn signalfd(fd: c_int, mask: *const crate::sigset_t, flags: c_int) -> c_int;  in signalfd()
4058     pub fn timerfd_gettime(fd: c_int, curr_value: *mut itimerspec) -> c_int;  in timerfd_gettime()
4060         fd: c_int,  in timerfd_settime()
4065     pub fn pwritev(fd: c_int, iov: *const crate::iovec, iovcnt: c_int, offset: off_t) -> ssize_t;  in pwritev()
4066     pub fn preadv(fd: c_int, iov: *const crate::iovec, iovcnt: c_int, offset: off_t) -> ssize_t;  in preadv()
4095     pub fn sync_file_range(fd: c_int, offset: off64_t, nbytes: off64_t, flags: c_uint) -> c_int;  in sync_file_range()
4127     pub fn futimes(fd: c_int, times: *const crate::timeval) -> c_int;  in futimes()
4136     pub fn writev(fd: c_int, iov: *const crate::iovec, iovcnt: c_int) -> ssize_t;  in writev()
4137     pub fn readv(fd: c_int, iov: *const crate::iovec, iovcnt: c_int) -> ssize_t;  in readv()
4139     pub fn sendmsg(fd: c_int, msg: *const crate::msghdr, flags: c_int) -> ssize_t;  in sendmsg()
4140     pub fn recvmsg(fd: c_int, msg: *mut crate::msghdr, flags: c_int) -> ssize_t;  in recvmsg()
4182     pub fn vmsplice(fd: c_int, iov: *const crate::iovec, nr_segs: size_t, flags: c_uint)  in vmsplice()