/usr/share/common-lisp/source/daemon/daemon.lisp is in cl-daemon 20140826-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(defpackage :daemon
(:use :cl)
(:export #:exit
#:daemonize
#:fork))
(in-package :daemon)
;;I don't know why but "sudo sbcl" lacks sb-posix
#+sbcl
(require :sb-posix)
#+allegro
(eval-when (:load-toplevel :execute)
(unless (excl.osi:detach-from-terminal-supported-p)
(error "not supported allegro cl to detach console")))
#+ecl
(ffi:clines "#include <fcntl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <grp.h>
#include <pwd.h>
#include <sys/stat.h>
")
(defconstant +default-mask+ (if (boundp '+default-mask+) +default-mask+ #o022))
(defconstant +default-mode+ (if (boundp '+default-mode+) +default-mode+ #o600))
(defvar *wnohang* (or
#+sbcl 1
#+allegro 1
#+ccl #.(read-from-string "#$WNOHANG")
#+ecl (ffi:c-inline () () :int "WNOHANG" :one-liner t)
))
(defvar *o-rdonly* (or
#+sbcl sb-posix:o-rdonly
#+allegro excl::*o-rdonly*
#+ccl #.(read-from-string "#$O_RDONLY")
#+ecl (ffi:c-inline () () :int "O_RDONLY" :one-liner t)
))
(defvar *o-wronly* (or
#+sbcl sb-posix:o-wronly
#+allegro excl::*o-wronly*
#+ccl #.(read-from-string "#$O_WRONLY")
#+ecl (ffi:c-inline () () :int "O_WRONLY" :one-liner t)
))
(defvar *o-append* (or
#+sbcl sb-posix:o-append
#+allegro excl::*o-append*
#+ccl #.(read-from-string "#$O_APPEND")
#+ecl (ffi:c-inline () () :int "O_APPEND" :one-liner t)
))
(defun chdir (dir)
#+sbcl (sb-posix:chdir dir)
#+allegro (excl:chdir dir)
#+ccl (ccl::%chdir dir)
#+ecl (ffi:c-inline (dir) (:cstring) :int
"chdir(#0)" :one-liner t))
(defun dup2 (old new)
#+sbcl (sb-posix:dup2 old new)
#+allegro (excl.osi::syscall-dup2 old new)
#+ccl (#.(read-from-string "#_dup2") old new)
#+ecl (ffi:c-inline (old new) (:int :int) :int
"dup2(#0,#1)" :one-liner t))
(defun fork ()
(or
#+sbcl (sb-posix:fork)
#+allegro (excl.osi:fork)
#+ccl (#.(read-from-string "#_fork"))
#+ecl (ffi:c-inline () () :int
"(int) fork()" :one-liner t)
(error "should support fork")))
#-allegro
(defun popen (fspec flags)
#+sbcl (sb-posix:open fspec flags)
#+ccl (ccl:with-cstrs ((cstr fspec)) (#.(read-from-string "#_open") cstr flags))
#+ecl (ffi:c-inline (fspec flags) (:cstring :int) :int
"open(#0,#1)" :one-liner t))
#+allegro
(ff:def-foreign-call (popen "open") ((path (* :char)) (flags :int)) :strings-convert t)
#-allegro
(defun pclose (fd)
#+sbcl (sb-posix:close fd)
#+ccl (#.(read-from-string "#_close") fd)
#+ecl (ffi:c-inline (fd) (:int) :int
"close(#0)" :one-liner t))
#+allegro
(ff:def-foreign-call (pclose "close") (d))
(defun exit ()
#+sbcl
#.(if (and (find-package :sb-posix)
(find-symbol (symbol-name :exit) :sb-posix))
(read-from-string "(sb-posix:exit 0)")
(read-from-string "(sb-unix:unix-exit)"))
#+allegro (excl:exit 0 :quiet t)
#+ccl (#.(read-from-string "#_exit") 0)
#+ecl (ext:exit))
(defun waitpid (pid option)
#+sbcl(zerop (sb-posix:waitpid pid option))
#+allegro (not (excl.osi:waitpid pid :wnohang (not (zerop option))))
#+ccl (zerop (#.(read-from-string "#_waitpid") pid 0 option))
#+ecl (ffi:c-inline (pid option) (:int :int) :int
"waitpid(#0,NULL,#1)" :one-liner t))
(defun setsid ()
#+sbcl (not (minusp (sb-posix:setsid)))
#+allegro (excl.osi:setsid)
#+ccl (not (minusp (#.(read-from-string "#_setsid"))))
#+ecl (not (minusp (ffi:c-inline () () :int
"setsid()" :one-liner t))))
(defun umask (mask)
#+sbcl (sb-posix:umask mask)
#+allegro (excl.osi:umask mask)
#+ccl (#.(read-from-string "#_umask") mask)
#+ecl (ffi:c-inline (mask) (:int) :int
"umask(#0)" :one-liner t))
(defun setuid (uid)
#+sbcl(sb-posix:setuid uid)
#+allegro (excl.osi:setuid uid)
#+ccl (#.(read-from-string "#_setuid") uid)
#+ecl (ffi:c-inline (uid) (:int) :int
"setuid(#0)" :one-liner t))
(defun getpid ()
#+sbcl (sb-posix:getpid)
#+allegro (excl.osi:getpid)
#+ccl (ccl::getpid)
#+ecl (ffi:c-inline () () :int
"getpid()" :one-liner t))
(defun getppid ()
#+sbcl (sb-posix:getppid)
#+allegro (excl.osi:getppid)
#+ccl (#.(read-from-string "#_getppid"))
#+ecl (ffi:c-inline () () :int
"getppid()" :one-liner t))
(defun getuid ()
#+sbcl (sb-posix:getuid)
#+allegro (excl.osi:getuid)
#+ccl (#.(read-from-string "#_getuid"))
#+ecl (ffi:c-inline () () :int
"getuid()" :one-liner t))
(defun getgrnam (name)
#+sbcl (sb-posix:getgrnam name)
#+allegro (excl.osi:getgrnam name)
#+ccl (ccl::with-cstrs ((cstr name)) (#.(read-from-string "#_getgrnam") cstr))
#+ecl (let ((ret (ffi:c-inline (name) (:cstring) :pointer-void
"getgrnam(#0)" :one-liner t)))
(unless (zerop (si:foreign-data-address ret))
ret)))
(defun setgid (gid)
#+sbcl (sb-posix:setgid gid)
#+allegro (excl.osi:setgid gid)
#+ccl (#.(read-from-string "#_setgid") gid)
#+ecl (ffi:c-inline (gid) (:int) :int
"setgid(#0)" :one-liner t))
(defun getgrgid (gid)
#+sbcl (sb-posix:getgrgid gid)
#+allegro (excl.osi:getgrgid gid)
#+ccl (#.(read-from-string "#_getgrgid") gid)
#+ecl (ffi:c-inline (gid) (:int) :pointer-void
"getgrgid(#0)" :one-liner t))
(defun group-gid (grp)
#+sbcl (sb-posix:group-gid grp)
#+allegro (excl.osi:grent-gid grp)
#+ccl (unless (ccl:%null-ptr-p grp) (ccl:pref grp :group.gr_gid))
#+ecl (ffi:c-inline (grp) (:pointer-void) :int
"((struct group*)(#0))->gr_gid" :one-liner t))
(defun getpwnam (name)
#+sbcl (sb-posix:getpwnam name)
#+allegro (excl.osi:getpwnam name)
#+ccl (ccl::with-cstrs ((cstr name)) (#.(read-from-string "#_getpwnam") cstr))
#+ecl (let ((ret (ffi:c-inline (name) (:cstring) :pointer-void
"getpwnam(#0)" :one-liner t)))
(unless (zerop (si:foreign-data-address ret))
ret)))
(defun getpwuid (id)
#+sbcl (sb-posix:getpwuid id)
#+allegro (excl.osi:getpwuid id)
#+ccl (#.(read-from-string "#_getpwuid") id)
#+ecl (let ((ret (ffi:c-inline (id) (:int) :pointer-void
"getpwuid(#0)" :one-liner t)))
(unless (zerop (si:foreign-data-address ret))
ret)))
(defun passwd-username (pswd)
#+sbcl (sb-posix:passwd-name pswd)
#+allegro (excl.osi:pwent-name pswd)
#+ccl (ccl:%get-cstring (ccl:pref pswd :passwd.pw_name))
#+ecl (when pswd
(ffi:c-inline (pswd) (:pointer-void) :cstring
"((struct passwd*)(#0))->pw_name" :one-liner t)))
(defun passwd-uid (pswd)
#+sbcl(sb-posix:passwd-uid pswd)
#+allegro (excl.osi:pwent-uid pswd)
#+ccl (unless (ccl:%null-ptr-p pswd) (ccl:pref pswd :passwd.pw_uid))
#+ecl (when pswd
(ffi:c-inline (pswd) (:pointer-void) :int
"((struct passwd*)(#0))->pw_uid" :one-liner t)))
(defun passwd-dir (pswd)
#+sbcl (sb-posix:passwd-dir pswd)
#+allegro (excl.osi:pwent-dir pswd)
#+ccl (ccl:%get-cstring(ccl:pref pswd :passwd.pw_dir))
#+ecl (when pswd
(ffi:c-inline (pswd) (:pointer-void) :cstring
"((struct passwd*)(#0))->pw_dir" :one-liner t)))
(defun detouch-terminal (&key input output error)
(declare (ignorable input output error))
#-allegro
(progn
(chdir "/")
(unless (eql t (setsid))
(exit))
#+sbcl
(progn
(setf sb-sys:*stdin* (make-concatenated-stream))
(setf sb-sys:*stdout* (make-broadcast-stream))
(setf sb-sys:*stderr* (make-broadcast-stream))
(when (sb-sys:fd-stream-p sb-sys:*tty*)
(close sb-sys:*tty* :abort t)
(setf sb-sys:*tty* (make-two-way-stream sb-sys:*stdin* sb-sys:*stdout*))))
#+ccl
(setf ccl::*stdin* (make-concatenated-stream)
ccl::*stdout* (make-broadcast-stream)
ccl::*terminal-input* ccl::*stdin*
ccl::*terminal-output* ccl::*stdout*
ccl::*terminal-io* (make-two-way-stream
ccl::*terminal-input* ccl::*terminal-output*))
(dup2 (popen "/dev/null" *o-rdonly*) 0)
(dup2 (popen "/dev/null" (logior *o-wronly* *o-append*)) 1)
(dup2 (popen "/dev/null" *o-rdonly*) 2))
#+allegro
(excl.osi:detach-from-terminal :output-stream nil :error-output-stream nil))
(defun daemonize (&key input output error (umask +default-mask+) pidfile
exit-parent (exit-hook t) (disable-debugger t)
user group
sigabrt sighup sigint sigterm)
(declare (ignorable exit-hook disable-debugger sigabrt sighup sigint sigterm))
(when pidfile
(ignore-errors (delete-file pidfile)))
(let ((uid (typecase user
(string
(or (passwd-uid (getpwnam user))
(error "Unknown username: ~S" user)))
(unsigned-byte
(or (passwd-uid user)
(error "Unknown userid: ~S" user)))))
(gid (typecase group
(string
(group-gid
(or (getgrnam group)
(error "Unknown groupname: ~S" group))))
(unsigned-byte
(if (getgrgid group)
group
(error "Unknown groupid: ~S" group)))))
(pid (fork)))
(cond ((zerop pid)
;; Child
(umask umask)
(detouch-terminal :input input :output output :error error)
(when gid
(setgid gid))
(when uid
(setuid uid))
(let* ((out (make-two-way-stream
(make-concatenated-stream)
(make-broadcast-stream))))
(setf *standard-output* out
*error-output* out
*trace-output* out
*standard-input* out
*debug-io* out
*query-io* out
*terminal-io* out)))
(t
;; Parent
(when exit-parent
(exit))
(pclose 0)
(pclose 1)
(pclose 2)
(return-from daemonize pid))))
(when pidfile
(with-open-file (f pidfile :direction :output
:if-exists :supersede)
(format f "~A~%" (getpid))))
nil)
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