pub const S = struct {
    pub const IFMT = 0o170000;

    pub const IFDIR = 0o040000;
    pub const IFCHR = 0o020000;
    pub const IFBLK = 0o060000;
    pub const IFREG = 0o100000;
    pub const IFIFO = 0o010000;
    pub const IFLNK = 0o120000;
    pub const IFSOCK = 0o140000;

    pub const ISUID = 0o4000;
    pub const ISGID = 0o2000;
    pub const ISVTX = 0o1000;
    pub const IRUSR = 0o400;
    pub const IWUSR = 0o200;
    pub const IXUSR = 0o100;
    pub const IRWXU = 0o700;
    pub const IRGRP = 0o040;
    pub const IWGRP = 0o020;
    pub const IXGRP = 0o010;
    pub const IRWXG = 0o070;
    pub const IROTH = 0o004;
    pub const IWOTH = 0o002;
    pub const IXOTH = 0o001;
    pub const IRWXO = 0o007;

    pub fn ISREG(m: mode_t) bool {
        return m & IFMT == IFREG;
    }

    pub fn ISDIR(m: mode_t) bool {
        return m & IFMT == IFDIR;
    }

    pub fn ISCHR(m: mode_t) bool {
        return m & IFMT == IFCHR;
    }

    pub fn ISBLK(m: mode_t) bool {
        return m & IFMT == IFBLK;
    }

    pub fn ISFIFO(m: mode_t) bool {
        return m & IFMT == IFIFO;
    }

    pub fn ISLNK(m: mode_t) bool {
        return m & IFMT == IFLNK;
    }

    pub fn ISSOCK(m: mode_t) bool {
        return m & IFMT == IFSOCK;
    }
}