Directly Mapped System Calls
exit, fork, creat, link, unlink, chdir, time, mknod, chmod, chown, lseek, getpid, setuid, getuid, stime, alarm, pause, utime, access, nice, sync, rename, mkdir, rmdir, dup, times, setgid, getgid, geteuid, getegid, setpgid, umask, chroot, dup2, getppid, getpgrp, setsid, setreuid, setregid, sethostname, gettimeofday, settimeofday, symlink, readlink, truncate, ftruncate, fchmod, fchown, setitimer, getitimer, fsync, setdomainname, getpgid, fchdir, sysfs, getdents, readv, writev, getsid