操作系统源代码

				.^b HF 1				.^b fh 0				.^b NH				.\"-----------------				.de r				.ie \\n(.$=0 .ft R				.el \\fR\\$1\\fP\\$2				..				.\"-----------------				.de i				.ie \\n(.$=0 .ft I				.el \\fI\\$1\\fP\\$2				..				.\"-----------------				.de b				.ie \\n(.$=0 .ft B				.el \\fB\\$1\\fP\\$2				..				.\"-----------------				.de UX				\\$2UNIX\\$1				..				.\"-----------------				.de DA				.ds DY "\\$1 \\$2 \\$3				.\" keep trailing spaces out of CF				.if \\n(.$=1 .ds CF "\\$1				.if \\n(.$=2 .ds CF "\\$1 \\$2				.if \\n(.$>2 .ds CF "\\$1 \\$2 \\$3				..				.\"-----------------				.de ND				.\" it's our default, ignore it				..				.\"-----------------				.de TL				.rs				.sp 5				.ft B				.ce 9999				..				.\"-----------------				.de AU				.sp 2				.ft R				..				.\"-----------------				.de AI				.sp				.ft R				..				.\"-----------------				.de AB				.sp 2				.ce 0				.ll -7n				.in +7n				..				.\"-----------------				.de AE				.sp				.ll				.in				..				.\" common initialization for headers and paragraphs:  .In need extraspace				.de In				.ne \\$1				.sp \\n(Tsu				.nr Ts 0				.ie \\n(.$>1 .nr iN \\$2v				.el .nr iN 0				.sp \\n(psu+\\n(iNu				.ce 0				.ft R				.in 0				.ti 0				.in \\n(inu				.ll \\n(LLu				.ns				.fi				..				.\"-----------------				.de uh				.\" unnumbered section head				.nr in 0				.In 6 1				.ie \\n(.$=0 .ft B				.el \\fB\\$1\\fP\\$2				..				.\"-----------------				.de sh				.\" numbered section head				.nr in 0				.In 6 1				.ft B				.\" punt to awk code to get the header numbering right				.nH \\$1				.\" and pick up the result				\&\\*(Nh \\$2				.ft R				..				.\"-----------------				.de lp				.\" left-blocked paragraph				.In 4				..				.\"-----------------				.de pp				.\" paragraph, first line indented				.In 4				.ti \\n(piu				..				.\"-----------------				.de tp				.In 4				.if \\n(.$>0 .nr tp \\$1n				.in \\n(inu+\\n(tpu				.ti 0-\\n(tpu				.\" .it 1 tP				..				.\"-----------------				.de ip				.\" indented paragraph				.ie \\n(.$>1 .tp "\\$2"				.el .tp 4n				\&\\$1				..				.\"-----------------				.de np				.\" numbered paragraph				.nr $p +1			\" increment paragraph number				.ip (\n($p)				..				.\"-----------------				.de bu				.\" bulleted paragraph				.ip \(bu				..				.\"-----------------				.de (q				.\" begin major quote				.nr in +5n				.nr LL -5n				.In 4				..				.\"-----------------				.de )q				.\" end major quote				.sp				.nr in -5n				.nr LL +5n				.In 4				..				.\"-----------------				.de (l				.\" begin list				.In 5				.if '\\$1'C' .ce 9999				.if '\\$1'' .in +5n				.if '\\$1'L' .in 0				.nf				..				.\"-----------------				.de )l				.\" end list				.In 3				.sp				.rs				..				.\"-----------------				.de u				\&\\fI$1\\fP				..				.\"-----------------				.de sm				..				.\"-----------------				.\" exdented paragraph macro borrowed from Berkeley -ms				.de XP					.lp				.in \\n(piu				.ti				..				.\"-----------------				.\" the -ms accent strings				.ds ' "'\b				.ds ` "`\b				.ds : ":\b				.ds ^ "^\b				.ds ~ "~\b				.ds C "v\b				.ds , ",\b				.\" post-title spacing (set to 4v if using .TL macro)				.nr Ts 0v				.\" and parameter setup				.nr LL 6i				.ll \n(LLu				.nr ps 0.3v				.nr pi 5n