sysctl (3) - get or set system information
sysctl (8) - get or set kernel state
sysctl.conf (5) - sysctl variables to set at system startup
sysctl_int, sysctl_int_arr, sysctl_quad, sysctl_string, sysctl_tstring, sysctl_rdint, sysctl_rdquad, sysctl_rdstring, sysctl_rdstruct, sysctl_struct (9) - kernel sysctl interface