diff --git a/mod.zig b/mod.zig
index 95a0b682a71942e4010a9c8ee96461fb9a3b53a3..abb8bfd0c090a1369bdb0e5b9665695c34475002 100644
--- a/mod.zig
+++ b/mod.zig
@@ -1 +1,800 @@
 const std = @import("std");
+const sys = std.os.linux;
+const syscall0 = sys.syscall0;
+const syscall1 = sys.syscall1;
+const syscall2 = sys.syscall2;
+const syscall3 = sys.syscall3;
+const syscall4 = sys.syscall4;
+const syscall5 = sys.syscall5;
+const syscall6 = sys.syscall6;
+const errno = @import("errno");
+
+fn _errno(rc: usize) enum(c_ushort) { ok, _ } {
+    const signed: isize = @bitCast(rc);
+    const int = if (signed > -4096 and signed < 0) -signed else 0;
+    return @enumFromInt(int);
+}
+
+// read
+// ssize_t read(int fd, void buf[.count], size_t count);
+// asmlinkage long sys_read(unsigned int fd, char __user *buf, size_t count);
+pub fn read(fd: c_int, buf: []u8) errno.Error!usize {
+    const r = syscall3(.read, fd, buf.ptr, buf.len);
+    return switch (_errno(r)) {
+        .ok => @intCast(r),
+        _ => |c| errno.errorFromInt(c),
+    };
+}
+
+// write
+// ssize_t write(int fd, const void buf[.count], size_t count);
+// asmlinkage long sys_write(unsigned int fd, const char __user *buf, size_t count);
+pub fn write(fd: c_int, buf: []const u8) errno.Error!usize {
+    const r = syscall3(.write, fd, buf.ptr, buf.len);
+    return switch (_errno(r)) {
+        .ok => @intCast(r),
+        _ => |c| errno.errorFromInt(c),
+    };
+}
+
+// open
+// int open(const char *pathname, int flags, ... /* mode_t mode */ );
+
+// close
+// int creat(const char *pathname, mode_t mode);
+
+// stat
+// int stat(const char *restrict pathname, struct stat *restrict statbuf);
+
+// fstat
+// int fstat(int fd, struct stat *statbuf);
+
+// lstat
+// int lstat(const char *restrict pathname, struct stat *restrict statbuf);
+
+// poll
+// int poll(struct pollfd *fds, nfds_t nfds, int timeout);
+
+// lseek
+// off_t lseek(int fd, off_t offset, int whence);
+
+// mmap
+// void *mmap(void addr[.length], size_t length, int prot, int flags, int fd, off_t offset);
+
+// mprotect
+// int mprotect(void addr[.len], size_t len, int prot);
+
+// munmap
+// int munmap(void addr[.length], size_t length);
+
+// brk
+// int brk(void *addr);
+
+// rt_sigaction
+
+// rt_sigprocmask
+
+// rt_sigreturn
+
+// ioctl
+
+// pread64
+// ssize_t pread(int fd, void buf[.count], size_t count, off_t offset);
+
+// pwrite64
+// ssize_t pwrite(int fd, const void buf[.count], size_t count, off_t offset);
+
+// readv
+// ssize_t readv(int fd, const struct iovec *iov, int iovcnt);
+
+// writev
+// ssize_t writev(int fd, const struct iovec *iov, int iovcnt);
+
+// access
+// int access(const char *pathname, int mode);
+
+// pipe
+// int pipe(int pipefd[2]);
+
+// select
+// int select(int nfds, fd_set *_Nullable restrict readfds, fd_set *_Nullable restrict writefds, fd_set *_Nullable restrict exceptfds, struct timeval *_Nullable restrict timeout);
+
+// sched_yield
+
+// mremap
+
+// msync
+
+// mincore
+
+// madvise
+
+// shmget
+
+// shmat
+
+// shmctl
+
+// dup
+
+// dup2
+
+// pause
+
+// nanosleep
+
+// getitimer
+
+// alarm
+
+// setitimer
+
+// getpid
+
+// sendfile
+
+// socket
+
+// connect
+
+// accept
+
+// sendto
+
+// recvfrom
+
+// sendmsg
+
+// recvmsg
+
+// shutdown
+
+// bind
+
+// listen
+
+// getsockname
+
+// getpeername
+
+// socketpair
+
+// setsockopt
+
+// getsockopt
+
+// clone
+
+// fork
+
+// vfork
+
+// execve
+
+// exit
+
+// wait4
+
+// kill
+
+// uname
+
+// semget
+
+// semop
+
+// semctl
+
+// shmdt
+
+// msgget
+
+// msgsnd
+
+// msgrcv
+
+// msgctl
+
+// fcntl
+
+// flock
+
+// fsync
+
+// fdatasync
+
+// truncate
+
+// ftruncate
+
+// getdents
+
+// getcwd
+
+// chdir
+
+// fchdir
+
+// rename
+
+// mkdir
+
+// rmdir
+
+// creat
+
+// link
+
+// unlink
+
+// symlink
+
+// readlink
+
+// chmod
+
+// fchmod
+
+// chown
+
+// fchown
+
+// lchown
+
+// umask
+
+// gettimeofday
+
+// getrlimit
+
+// getrusage
+
+// sysinfo
+
+// times
+
+// ptrace
+
+// getuid
+
+// syslog
+
+// getgid
+
+// setuid
+
+// setgid
+
+// geteuid
+
+// getegid
+
+// setpgid
+
+// getppid
+
+// getpgrp
+
+// setsid
+
+// setreuid
+
+// setregid
+
+// getgroups
+
+// setgroups
+
+// setresuid
+
+// getresuid
+
+// setresgid
+
+// getresgid
+
+// getpgid
+
+// setfsuid
+
+// setfsgid
+
+// getsid
+
+// capget
+
+// capset
+
+// rt_sigpending
+
+// rt_sigtimedwait
+
+// rt_sigqueueinfo
+
+// rt_sigsuspend
+
+// sigaltstack
+
+// utime
+
+// mknod
+
+// uselib
+
+// personality
+
+// ustat
+
+// statfs
+
+// fstatfs
+
+// sysfs
+
+// getpriority
+
+// setpriority
+
+// sched_setparam
+
+// sched_getparam
+
+// sched_setscheduler
+
+// sched_getscheduler
+
+// sched_get_priority_max
+
+// sched_get_priority_min
+
+// sched_rr_get_interval
+
+// mlock
+
+// munlock
+
+// mlockall
+
+// munlockall
+
+// vhangup
+
+// modify_ldt
+
+// pivot_root
+
+// _sysctl
+
+// prctl
+
+// arch_prctl
+
+// adjtimex
+
+// setrlimit
+
+// chroot
+
+// sync
+
+// acct
+
+// settimeofday
+
+// mount
+
+// umount2
+
+// swapon
+
+// swapoff
+
+// reboot
+
+// sethostname
+
+// setdomainname
+
+// iopl
+
+// ioperm
+
+// create_module
+
+// init_module
+
+// delete_module
+
+// get_kernel_syms
+
+// query_module
+
+// quotactl
+
+// nfsservctl
+
+// getpmsg
+
+// putpmsg
+
+// afs_syscall
+
+// tuxcall
+
+// security
+
+// gettid
+
+// readahead
+
+// setxattr
+
+// lsetxattr
+
+// fsetxattr
+
+// getxattr
+
+// lgetxattr
+
+// fgetxattr
+
+// listxattr
+
+// llistxattr
+
+// flistxattr
+
+// removexattr
+
+// lremovexattr
+
+// fremovexattr
+
+// tkill
+
+// time
+
+// futex
+
+// sched_setaffinity
+
+// sched_getaffinity
+
+// set_thread_area
+
+// io_setup
+
+// io_destroy
+
+// io_getevents
+
+// io_submit
+
+// io_cancel
+
+// get_thread_area
+
+// lookup_dcookie
+
+// epoll_create
+
+// epoll_ctl_old
+
+// epoll_wait_old
+
+// remap_file_pages
+
+// getdents64
+
+// set_tid_address
+
+// restart_syscall
+
+// semtimedop
+
+// fadvise64
+
+// timer_create
+
+// timer_settime
+
+// timer_gettime
+
+// timer_getoverrun
+
+// timer_delete
+
+// clock_settime
+
+// clock_gettime
+
+// clock_getres
+
+// clock_nanosleep
+
+// exit_group
+
+// epoll_wait
+
+// epoll_ctl
+
+// tgkill
+
+// utimes
+
+// vserver
+
+// mbind
+
+// set_mempolicy
+
+// get_mempolicy
+
+// mq_open
+
+// mq_unlink
+
+// mq_timedsend
+
+// mq_timedreceive
+
+// mq_notify
+
+// mq_getsetattr
+
+// kexec_load
+
+// waitid
+
+// add_key
+
+// request_key
+
+// keyctl
+
+// ioprio_set
+
+// ioprio_get
+
+// inotify_init
+
+// inotify_add_watch
+
+// inotify_rm_watch
+
+// migrate_pages
+
+// openat
+// int openat(int dirfd, const char *pathname, int flags, ... /* mode_t mode */ );
+
+// mkdirat
+
+// mknodat
+
+// fchownat
+
+// futimesat
+
+// fstatat64
+// int fstatat(int dirfd, const char *restrict pathname, struct stat *restrict statbuf, int flags);
+
+// unlinkat
+
+// renameat
+
+// linkat
+
+// symlinkat
+
+// readlinkat
+
+// fchmodat
+
+// faccessat
+// int faccessat(int dirfd, const char *pathname, int mode, int flags);
+
+// pselect6
+// int pselect(int nfds, fd_set *_Nullable restrict readfds, fd_set *_Nullable restrict writefds, fd_set *_Nullable restrict exceptfds, const struct timespec *_Nullable restrict timeout, const sigset_t *_Nullable restrict sigmask);
+
+// ppoll
+// int ppoll(struct pollfd *fds, nfds_t nfds, const struct timespec *_Nullable tmo_p, const sigset_t *_Nullable sigmask);
+
+// unshare
+
+// set_robust_list
+
+// get_robust_list
+
+// splice
+
+// tee
+
+// sync_file_range
+
+// vmsplice
+
+// move_pages
+
+// utimensat
+
+// epoll_pwait
+
+// signalfd
+
+// timerfd_create
+
+// eventfd
+
+// fallocate
+
+// timerfd_settime
+
+// timerfd_gettime
+
+// accept4
+
+// signalfd4
+
+// eventfd2
+
+// epoll_create1
+
+// dup3
+
+// pipe2
+// int pipe2(int pipefd[2], int flags);
+
+// inotify_init1
+
+// preadv
+// ssize_t preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset);
+
+// pwritev
+// ssize_t pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset);
+
+// rt_tgsigqueueinfo
+
+// perf_event_open
+
+// recvmmsg
+
+// fanotify_init
+
+// fanotify_mark
+
+// prlimit64
+
+// name_to_handle_at
+
+// open_by_handle_at
+
+// clock_adjtime
+
+// syncfs
+
+// sendmmsg
+
+// setns
+
+// getcpu
+
+// process_vm_readv
+
+// process_vm_writev
+
+// kcmp
+
+// finit_module
+
+// sched_setattr
+
+// sched_getattr
+
+// renameat2
+
+// seccomp
+
+// getrandom
+
+// memfd_create
+
+// kexec_file_load
+
+// bpf
+
+// execveat
+
+// userfaultfd
+
+// membarrier
+
+// mlock2
+
+// copy_file_range
+
+// preadv2
+// ssize_t preadv2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags);
+
+// pwritev2
+// ssize_t pwritev2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags);
+
+// pkey_mprotect
+// int pkey_mprotect(void addr[.len], size_t len, int prot, int pkey);
+
+// pkey_alloc
+
+// pkey_free
+
+// statx
+
+// io_pgetevents
+
+// rseq
+
+// pidfd_send_signal
+
+// io_uring_setup
+
+// io_uring_enter
+
+// io_uring_register
+
+// open_tree
+
+// move_mount
+
+// fsopen
+
+// fsconfig
+
+// fsmount
+
+// fspick
+
+// pidfd_open
+
+// clone3
+
+// close_range
+
+// openat2
+// int openat2(int dirfd, const char *pathname, const struct open_how *how, size_t size);
+
+// pidfd_getfd
+
+// faccessat2
+
+// process_madvise
+
+// epoll_pwait2
+
+// mount_setattr
+
+// quotactl_fd
+
+// landlock_create_ruleset
+
+// landlock_add_rule
+
+// landlock_restrict_self
+
+// memfd_secret
+
+// process_mrelease
+
+// futex_waitv
+
+// set_mempolicy_home_node
+
+// cachestat
+
+// fchmodat2
+
+// map_shadow_stack
+
+// futex_wake
+
+// futex_wait
+
+// futex_requeue