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$FreeBSD: head/usr.sbin/daemon/daemon.8 231910 2012-02-19 10:23:51Z trociny $
.Dd February 19, 2012 .Dt DAEMON 8 .Os .Sh NAME .Nm daemon .Nd run detached from the controlling terminal .Sh SYNOPSIS .Nm .Op Fl cf .Op Fl p Ar pidfile .Op Fl u Ar user .Ar command arguments ... .Sh DESCRIPTION The .Nm utility detaches itself from the controlling terminal and executes the program specified by its arguments. Privileges may be lowered to the specified user.
p The options are as follows: l -tag -width indent t Fl c Change the current working directory to the root
q Dq Pa / . t Fl f Redirect standard input, standard output and standard error to
a /dev/null . t Fl p Ar file Write the ID of the created process into the .Ar file using the .Xr pidfile 3 functionality. The program is executed in a spawned child process while the .Nm waits until it terminates to keep the .Ar file locked and removes it after the process exits. The .Ar file owner is the user who runs the .Nm regardless of whether the .Fl u option is used or not. If the monitoring .Nm receives software termination signal (SIGTERM) it forwards it to the spawned process. Normally it will cause the child to exit followed by the termination of the supervising process after removing the pidfile. t Fl u Ar user Login name of the user to execute the program under. Requires adequate superuser privileges. .El .Sh EXIT STATUS The .Nm utility exits 1 if an error is returned by the .Xr daemon 3 library routine, 2 if the .Ar pidfile is requested, but cannot be opened, 3 if process is already running (pidfile exists and is locked), otherwise 0. .Sh DIAGNOSTICS If the command cannot be executed, an error message is displayed on standard error unless the .Fl f flag is specified. .Sh SEE ALSO .Xr setregid 2 , .Xr setreuid 2 , .Xr daemon 3 , .Xr exec 3 , .Xr pidfile 3 , .Xr termios 4 , .Xr tty 4 .Sh HISTORY The .Nm utility first appeared in .Fx 4.7 .