setuid.2

操作系统设计与实现源码

%!PS-Adobe-1.0
%%Creator: devps (Pipeline Associates, Inc.)
%%CreationDate: Fri Sep 13 13:05:53 1996
%%Pages: (atend)
%%DocumentFonts: (atend)

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/np{newpath}bind def
/ct{curveto}bind def
systemdict /setpacking known
 { /savepacking currentpacking def true setpacking } if
/m0{0 0 moveto}bind def
/xc{//res div}bind def
/yc{//res neg div //y_offset add}bind def
/lc{yc X xc X l st}bind def
/mc{yc X xc X m}bind def
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m}bind def
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/startFig {
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	DocumentInitState setmiterlimit setgray setdash setlinejoin setlinecap
		setlinewidth setmatrix

	itransform moveto

	/ury exch def
	/urx exch def
	/lly exch def
	/llx exch def
	/y exch 72 mul resolution div def
	/x exch 72 mul resolution div def
	
	currentpoint /cy exch def /cx exch def

	/sx x urx llx sub div def
	/sy y ury lly sub div def

	sx sy scale

	cx sx div llx sub
	cy sy div ury sub translate
	
	/DefFigCTM matrix currentmatrix def

	/initmatrix {
		DefFigCTM setmatrix
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		DocumentInitState setmiterlimit setgray setdash 
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	exch lineto
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	moveto
}bind  def
/doclip { llx lly urx ury clipFig } def
/endFig {
	end SavedState restore
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	fontnum psize slant height resolution currentpoint 
	pagesave restore gsave 
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/globalend {
	grestore moveto
	/resolution exch def /height exch def
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	F
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}bind  def


/fontnum 1 def 
systemdict /setpacking known { savepacking setpacking} if
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Encoding-1 8#301 StandardEncoding 8#101 26 getinterval putinterval %A-B
Encoding-1 8#341 StandardEncoding 8#141 26 getinterval putinterval %a-b
Encoding-1 8#241 StandardEncoding 8#301 16 getinterval putinterval %accents
Encoding-1 8#373 StandardEncoding 8#365 1 getinterval putinterval %dotlessi
Encoding-1
dup 8#41 /copyright put
dup 8#42 /registered put
dup 8#43 /trademark put
dup 8#44 /logicalnot put
dup 8#45 /Eth put
dup 8#46 /eth put
dup 8#47 /Thorn put
dup 8#50 /thorn put
dup 8#51 /brokenbar put
dup 8#52 /degree put
dup 8#53 /divide put
dup 8#54 /multiply put
dup 8#55 /minus put
dup 8#56 /onehalf put
dup 8#57 /onequarter put
dup 8#60 /threequarters put
dup 8#101 /Aacute put
dup 8#102 /Acircumflex put
dup 8#103 /Adieresis put
dup 8#104 /Agrave put
dup 8#105 /Aring put
dup 8#106 /Atilde put
dup 8#107 /Ccedilla put
dup 8#110 /Eacute put
dup 8#111 /Ecircumflex put
dup 8#112 /Edieresis put
dup 8#113 /Egrave put
dup 8#114 /Iacute put
dup 8#115 /Icircumflex put
dup 8#116 /Idieresis put
dup 8#117 /Igrave put
dup 8#120 /Ntilde put
dup 8#121 /Oacute put
dup 8#122 /Ocircumflex put
dup 8#123 /Odieresis put
dup 8#124 /Ograve put
dup 8#125 /Otilde put
dup 8#126 /Scaron put
dup 8#127 /Uacute put
dup 8#130 /Ucircumflex put
dup 8#131 /Udieresis put
dup 8#132 /Ugrave put
dup 8#133 /Ydieresis put
dup 8#134 /Zcaron put
dup 8#135 /aacute put
dup 8#136 /acircumflex put
dup 8#137 /adieresis put
dup 8#140 /agrave put
dup 8#141 /aring put
dup 8#142 /atilde put
dup 8#143 /ccedilla put
dup 8#144 /eacute put
dup 8#145 /ecircumflex put
dup 8#146 /edieresis put
dup 8#147 /egrave put
dup 8#150 /iacute put
dup 8#151 /icircumflex put
dup 8#152 /idieresis put
dup 8#153 /igrave put
dup 8#154 /ntilde put
dup 8#155 /oacute put
dup 8#156 /ocircumflex put
dup 8#157 /odieresis put
dup 8#160 /ograve put
dup 8#161 /otilde put
dup 8#162 /scaron put
dup 8#163 /uacute put
dup 8#164 /ucircumflex put
dup 8#165 /udieresis put
dup 8#166 /ugrave put
dup 8#167 /ydieresis put
dup 8#170 /zcaron put
pop

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Enc-dict /tmpstr1 50 string put
Enc-dict /tmpstr2 50 string put
Enc-dict /tmpstr3 50 string dup (Encoding-) exch cvs pop put
/AEnc-def { % arguments: the original font's name, encoding nr
Enc-dict begin
tmpstr2 cvs /Enc-no exch def % Remember the number in a string
dup /OrigName exch def % remember the name
findfont dup maxlength dict /newdict exch def % get dictionary for new font
{ exch dup /FID ne
   { exch newdict 3 1 roll put }
   { pop pop } % Ignore FID
   ifelse
} forall
newdict begin
/Encoding
  tmpstr3 9 Enc-no putinterval tmpstr3 0 9 Enc-no length add getinterval
  cvn load
  def % Replace encoding
currentdict /UniqueID known
{ /UniqueID UniqueID Enc-no cvi 49999 mul add def } if % Derive New UniqueID
end % newdict
/FNlength OrigName tmpstr1 cvs length def % convert name, remember length
FNlength 1 add Enc-no length add string
dup 0 OrigName tmpstr1 cvs putinterval
dup FNlength (-) putinterval
dup FNlength 1 add Enc-no putinterval
dup 0 tmpstr1 0 FNlength getinterval putinterval % Add old name
cvn dup newdict /FontName 3 2 roll put newdict definefont
end % Enc-dict
} def
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%%EndProlog
%%Page: 1 1
BP
/slant 0 def
/height 0 def
480 V
10 R
720(SETUID)S
1088(\()S
1130(2)S
1188(\))S
2696(Eighth)S
(Edition)296 2989 A
4759(SETUID)S
5127(\()S
5169(2)S
5227(\))S
960 V
9 R
720(N)S
722(NA)S
790(AM)S
858(ME)S
940(E)S
1080 V
10 R
1080(setuid,)S
1370(setgid)S
10 R-1
1635(-)S
10 R
1717(set)S
1854(user)S
2047(or)S
(group)234 2156 A
2415(ID's)S
1248 V
9 R
720(S)S
722(SY)S
774(YN)S
842(NO)S
910(OP)S
978(PS)S
1030(SI)S
1082(IS)S
1115(S)S
1368 V
10 B
1080(#include)S
1482(<sys/types.h>)S
1608 V
1080(int)S
1236(setuid\(uid_t)S
10 I
1790(uid)S
10 B
1918(\))S
1728 V
1080(int)S
1236(setgid\(gid_t)S
10 I
1778(gid)S
10 B
1906(\))S
1896 V
9 R
720(D)S
722(DE)S
790(ES)S
848(SC)S
900(CR)S
962(RI)S
1024(IP)S
1057(PT)S
1109(TI)S
1167(IO)S
1200(ON)S
1268(N)S
2016 V
10 B
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10 R
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1562(the)S
1713(real)S
1893(and)S
2066(effective)S
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2644(ID's)S
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2965(the)S
3117(current)S
3432(process)S
3763(to)S
10 I
3870(uid)S
10 R
4006(.)S
4085(Unprivileged)S
4645(users)S
4881(may)S
5083(only)S
2136 V
1080(change)S
1399(both)S
1611(user)S
1813(ID's)S
2027(to)S
2139(the)S
2296(real)S
2482(user)S
2683(ID;)S
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3218(super-user)S
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3877(make)S
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10 B
4775(Setgid)S
10 R
5077(does)S
2256 V
1080(the)S
1228(same)S
1460(for)S
1603(the)S
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1928(and)S
2098(effective)S
(group)234 2477 A
2736(ID's.)S
2424 V
1080(Minix-vmd)S
1565(allows)S
1856(an)S
(unprivileged)508 1979 A
2515(user)S
2711(to)S
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2544 V
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1330(time)S
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2196(executed.)S
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2630(Setgid)S
10 R
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3124(also)S
3312(set)S
3450(the)S
(group)234 3599 A
3859(ID's)S
4065(to)S
4169(any)S
4340(of)S
4450(the)S
(additional)402 4599 A
(group)234 5027 A
2664 V
1080(ID's.)S
1335(If)S
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1598(of)S
1707(the)S
1855(remembered)S
2384(user)S
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4418(chosen.)S
2832 V
9 R
720(R)S
722(RE)S
784(ET)S
842(TU)S
900(UR)S
968(RN)S
1030(N)S
1121(V)S
1123(VA)S
1191(AL)S
1259(LU)S
1317(UE)S
1385(E)S
2952 V
10 R
(Upon)223 1080 A
(successful)414 1328 A
1768(completion,)S
2271(a)S
2342(value)S
2586(of)S
2696(0)S
2772(is)S
2865(returned.)S
3277(Otherwise,)S
3743(a)S
3814(value)S
4058(of)S
10 R-1
4168(-)S
10 R
4225(1)S
4301(is)S
4394(returned)S
4756(and)S
10 B
(errno)241 4927 A
10 R
5194(is)S
3072 V
1080(set)S
1217(to)S
1320(indicate)S
1664(the)S
1812(error.)S
3240 V
9 R
720(E)S
722(ER)S
780(RR)S
842(RO)S
904(OR)S
972(RS)S
1034(S)S
3360 V
10 R
1080([EPERM])S
1830(The)S
2015(current)S
2329(process)S
2659(is)S
2754(not)S
2910(the)S
3061(super-user)S
3509(and)S
3682(a)S
3755(change)S
4068(other)S
4303(than)S
4504(one)S
4677(of)S
4790(the)S
4942(allowed)S
3480 V
1830(changes)S
2179(was)S
2361(attempted.)S
3648 V
9 R
720(S)S
722(SE)S
774(EE)S
832(E)S
913(A)S
915(AL)S
983(LS)S
1041(SO)S
1093(O)S
3768 V
10 B
1080(getuid)S
10 R
1349(\(2\),)S
10 B
1517(getgid)S
10 R
1780(\(2\).)S
7903 V
720(Page)S
941(1)S
2694(\()S
2736(May)S
2945(9,)S
(1985)200 3045 A
3253(\))S
4455(September)S
4911(13,)S
(1996)200 5061 A
8143 V
EP
%%Trailer
%%DocumentFonts: Times-Roman Times-Bold Times-Italic
%%Pages: 1