4.4BSD/usr/share/man/cat3/daemon.0

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DAEMON(3)                   BSD Programmer's Manual                  DAEMON(3)

NNAAMMEE
     ddaaeemmoonn - run in the background

SSYYNNOOPPSSIISS
     ddaaeemmoonn(_i_n_t _n_o_c_h_d_i_r, _i_n_t _n_o_c_l_o_s_e);

DDEESSCCRRIIPPTTIIOONN
     The ddaaeemmoonn() function is for programs wishing to detach themselves from
     the controlling terminal and run in the background as system daemons.

     Unless the argument _n_o_c_h_d_i_r is non-zero, ddaaeemmoonn() changes the current
     working directory to the root (``/'').

     Unless the argument _n_o_c_l_o_s_e is non-zero, ddaaeemmoonn() will redirect standard
     input, standard output and standard error to ``/dev/null''.

EERRRROORRSS
     The function ddaaeemmoonn() may fail and set _e_r_r_n_o for any of the errors speci-
     fied for the library functions fork(2) and setsid(2).

SSEEEE AALLSSOO
     setsid(2)

HHIISSTTOORRYY
     The ddaaeemmoonn() function first appeared in 4.4BSD.

4.4BSD                           June 9, 1993                                1