/***************************************************************************** * File            : daemon.c                                                * * System Name     : StarRing                                                * * VERSION         : 1.0                                                     * * LANGUAGE        : ANSIC                                                   * * OS & ENVIROMENT : Linux                                                   *  *                                                                           * * DESCRIPTION     : function to init daemon process                         * *                                                                           * * HISTORY:                                                                  * * MM/DD/YYYY      ADDRESS          PROGRAMMER            DESCRIPTION        * *---------------------------------------------------------------------------* * 22/08/2002      CHENGDU          ChenBo               Creation           * *                                                                           * *****************************************************************************/#include <chenpubhead.h>int daemon_start( char *workdir ){    pid_t	pid;    if ( (pid=fork()) < 0 ) {  /* create 1st child */        Errlog( __FILE__,__LINE__, "fork()" );        return E_FAIL;    }    if ( pid > 0 )         exit( 0 );    /* 1st child continue */    setsid();    /* become session leader */    signal(SIGHUP, SIG_IGN);    if ( (pid = fork()) < 0) { /* create 2nd child */        Errlog( __FILE__,__LINE__, "fork()" );        return E_FAIL;    }    if ( pid > 0 ) /* 1st child exit */        exit( 0 );        /* 2nd child continue */    umask( 0 );    if ( workdir != NULL )        chdir( workdir );    return E_OK;}