glibc/io/Versions

libc {
  GLIBC_2.0 {
    # functions used in inline functions or macros
    __xstat; __fxstat; __lxstat; __xmknod; __write; __close; __fcntl;
    __lseek; __open; __read;

    # functions used by libstdc++ 2.7.2
    __dup2; __pipe;

    # a*
    access;

    # c*
    chdir; chmod; chown; close; creat;

    # d*
    dup; dup2;

    # e*
    euidaccess;

    # f*
    fchdir; fchmod; fchown; fcntl; flock; fstatfs; fts_children; fts_close;
    fts_open; fts_read; fts_set; ftw;

    # g*
    get_current_dir_name; getcwd; getwd;

    # i*
    isatty;

    # l*
    lchown; link; lockf; lseek;

    # m*
    mkdir; mkfifo;

    # o*
    open;

    # p*
    pipe; poll;

    # r*
    read; readlink; rmdir;

    # s*
    statfs; symlink;

    # t*
    ttyname; ttyname_r;

    # u*
    umask; unlink; utime;

    # w*
    write;
  }
  GLIBC_2.1 {
    # functions used in other libraries
    __xstat64; __fxstat64; __lxstat64; __poll;

    # c*
    creat64;

    # f*
    fstatfs64; fstatvfs; fstatvfs64; ftw64;

    # l*
    lockf64; lseek64;

    # n*
    nftw; nftw64;

    # o*
    open64;

    # s*
    sendfile;
    statfs64; statvfs; statvfs64;
  }
  GLIBC_2.2 {
    # p*
    posix_fadvise; posix_fadvise64; posix_fallocate; posix_fallocate64;

    __open64;
  }
  GLIBC_2.3 {
    # s*
    sendfile64;
  }
  GLIBC_2.3.2 {
    # l*
    lchmod;
  }
  GLIBC_2.3.3 {
    # n*
    nftw; nftw64;
  }
  GLIBC_2.4 {
    eaccess;

    faccessat;
    fchmodat;
    fchownat;
    __fxstatat; __fxstatat64;
    linkat;
    mkdirat; mkfifoat; __xmknodat;
    openat; openat64;
    readlinkat;
    symlinkat;
    unlinkat;

    ppoll;
  }
  GLIBC_2.6 {
    utimensat; futimens;
  }
  GLIBC_2.7 {
    __open_2; __open64_2; __openat_2; __openat64_2;
  }
  GLIBC_2.9 {
    dup3; pipe2;
  }
  GLIBC_2.23 {
    fts64_children; fts64_close; fts64_open; fts64_read; fts64_set;
  }
  GLIBC_2.27 {
    copy_file_range;
  }
  GLIBC_PRIVATE {
    __libc_fcntl;
    __fcntl_nocancel;
    __open64_nocancel;
    __write_nocancel;
  }
}