Unixlab Manual for jntu anantapur syllabus
Transcript of Unixlab Manual for jntu anantapur syllabus
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UNIX INTERNALS LAB
1.AIM: Write a program to create pipes?
PROGRAM
#include <stdio!"
#include <stdli!"
#include <s$s%t$pes!"
#de&ine 'AX ()
main*+
,
pid-t pid.
int &d/01.
c!ar line/'AX1.
i& *pipe*&d+<)+
,
perror*23I3E2+.
e4it*5+.
6
pid7&or8*+.
i& *pid<)+
,
perror*29:R;2+.
e4it*5+.
6
i& *pid77)+
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UNIX INTERNALS LAB
,
print&*2=IL> IS ATIE@n2+.
close*&d/51+.
read*&d/)1line'AX+.
print&*23arent 'essage is s@n2line+.
6
else
,
print&*23ARENT IS ATIE@n2+.
close*&d/)1+.
Crite*&d/512=oC are Dou255+.
6
6
EXECUTION STEPS:
[sampath@localhost ipc]$ i pipesc
[sampath@localhost ipc]$ cc pipesc
[sampath@localhost ipc]$ %aout
3ARENT IS ATIEF
=IL> IS ATIE
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UNIX INTERNALS LAB
3arent 'essage is =oC are Dou
2.AIM: Write a program &or 9I9:?
PROGRAM
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UNIX INTERNALS LAB
#include <stdio!"
#include <stdli!"
#include <errno!"
#include <string!"
#include <&cntl!"
#include <s$s%t$pes!"
#include <s$s%stat!"
#include <unistd!"
#de&ine 9I9:-NA'E 2SU=RIT-S:LUTI:NS2
#de&ine 9I9:
int main*oid+
,
c!ar s/G))1.
int num &d.
m8nod*9I9:-NA'E SHI 9I9: )JJJ )+.
print&*2Waiting &or Criters@n2+.
&d 7 open*9I9:-NA'E :-R>:NLD+.
print&*2DesK got a Criter@n2+.
do
,
i& **num 7 read*&d s G))++ 77 H5+
perror*2read2+.
else
,
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UNIX INTERNALS LAB
s/num1 7 @).
print&*2SolutionsM read d $tesM @2s@2@n2num s+.
6
6 C!ile *num " )+.
return ).
6
EXECUTION STEPS:
[sampath@localhost ipc]$ i &i&oc
[sampath@localhost ipc]$ cc &i&oc
[sampath@localhost ipc]$ %aout
Waiting &or Criters
DesK got a Criter
acd
SolutionsM read $tesMacd
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UNIX INTERNALS LAB
3.AIM: Write a program to create Crite and read &rom s!ared memor$?
PROGRAM
#include <s$s%t$pes!"
#include <s$s%ipc!"
#include <s$s%s!m!"
#include <unistd!"
#include <string!"
#include <errno!"
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UNIX INTERNALS LAB
int main*oid+
,
pid-t pid.
int Os!ared. %O pointer to t!e s!m O%
int s!mid.
s!mid 7 s!mget*I3-3RIATE siPeo&*int+ I3-REAT )JJJ+.
print&*2S!ared 'emor$ I>7u2s!mid+.
i& *&or8*+ 77 )+
,
%O !ild O% %O Attac! to s!ared memor$ and print t!e pointer O%
s!ared 7 s!mat*s!mid *oid O+ ) )+.
print&*2!ild pointer u@n2 s!ared+.
Os!ared75.
print&*2!ild alue7d@n2 Os!ared+.
sleep*0+.
print&*2!ild alue7d@n2 Os!ared+.
6
else
,
%O 3arent O% %O Attac! to s!ared memor$ and print t!e pointer O%
s!ared 7 s!mat*s!mid *oid O+ ) )+.
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UNIX INTERNALS LAB
print&*23arent pointer u@n2 s!ared+.
print&*23arent alue7d@n2 Os!ared+.
sleep*5+.
Os!ared70.
print&*23arent alue7d@n2 Os!ared+.
sleep*(+.
s!mctl*s!mid I3-R'I> )+.
6
6
EXECUTION STEPS:
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UNIX INTERNALS LAB
/sampat!Qlocal!ost ipc1i s!ared-memc
/sampat!Qlocal!ost ipc1cc s!ared-memc
/sampat!Qlocal!ost ipc1 %aout
S!ared 'emor$ I>7J((G!ild pointer G)JJ))J
!ild alue75
S!ared 'emor$ I>7J((G3arent pointer G)JJ))J
3arent alue75
3arent alue70
!ild alue70
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UNIX INTERNALS LAB
4.AIM:
Write a program to implement arious operations on 'essage ueue ?
PROGRAM
message-sendc HH creating and sending to a simple message Vueue
#include <s$s%t$pes!"
#include <s$s%ipc!"
#include <s$s%msg!"
#include <stdio!"
#include <string!"
#de&ine 'SS 50
%O >eclare t!e message structure O%
t$pede& struct msgu&
,
long mt$pe.
c!ar mte4t/'SS1.
6 message-u&.
main*+
,
int msVid.
int msg&lg 7 I3-REAT )JJJ.
8e$-t 8e$.
message-u& su&.
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UNIX INTERNALS LAB
siPe-t u&-lengt!.
%O et t!e message Vueue id &or t!e 2name2 50G C!ic! Cas created $ t!eserer O%
8e$ 7 50G.
*oid+ &print&*stderr 2@nmsggetM alling msgget*#l4@ #o+@n2 8e$ msg&lg+.
i& **msVid 7 msgget*8e$ msg&lg ++ < )+
,
perror*2msgget2+.
e4it*5+.
6
else
*oid+ &print&*stderr2msggetM msgget succeededM msVid 7 d@n2 msVid+.
%O Well send message t$pe O%
su&mt$pe 7 5.
*oid+ &print&*stderr2msggetM msgget succeededM msVid 7 d@n2 msVid+.
*oid+ strcp$*su&mte4t 2>id $ou get t!is?2+.
*oid+ &print&*stderr2msggetM msgget succeededM msVid 7 d@n2 msVid+.
u&-lengt! 7 strlen*su&mte4t+ Y 5 .
%O Send a messageO%
i& *msgsnd*msVid Zsu& u&-lengt! I3-N:WAIT+ < )+
,
print& *2d d s d@n2 msVid su&mt$pe su&mte4t u&-lengt!+.
perror*2msgsnd2+.
e4it*5+.
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UNIX INTERNALS LAB
6
else
print&*2'essageM @2s@2 Sent@n2 su&mte4t+.
e4it*)+.
6
message-recc HH receiing t!e aoe message
#include <s$s%t$pes!"
#include <s$s%ipc!"
#include <s$s%msg!"
#include <stdio!"
#de&ine 'SS 50
%O >eclare t!e message structure O%
t$pede& struct msgu&
,
long mt$pe.
c!ar mte4t/'SS1.
6 message-u&.
main*+
,
int msVid.
8e$-t 8e$.
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UNIX INTERNALS LAB
message-u& ru&.
%O et t!e message Vueue id &or t!e 2name2 50G C!ic! Cas created $ t!e serer O%
8e$ 7 50G.
i& **msVid 7 msgget*8e$ )JJJ++ < )+
,
perror*2msgget2+.
e4it*5+.
6
i& *msgrc*msVid Zru& 'SS 5 )+ < )+
,
perror*2msgrc2+.
e4it*5+.
6
%O 3rint t!e ansCer O%
print&*2s@n2 ru&mte4t+.
e4it*)+.
6
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UNIX INTERNALS LAB
EXECUTION STEPS:
[sampath@localhost msg%e]'i message(se)*+c
[sampath@localhost msg%e]cc message(se)*+c
[sampath@localhost msg%e]m' a+ot msgse)*
[sampath@localhost msg%e]$ +,msgse)*
msgget- Calli)g msgget./4*2 0 1)
msgget- msgget sccee*e*- ms%i*
msgget- msgget sccee*e*- ms%i*
msgget- msgget sccee*e*- ms%i*
essage- i* o get this6 Se)t
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UNIX INTERNALS LAB
[sampath@localhost msg%e]'i message(7ec+c
[sampath@localhost msg%e]cc message(7ec+c
[sampath@localhost msg%e]m' a+ot msg7ec
[sampath@localhost msg%e]$ +,msg7ec &
[1] 2#!
[sampath@localhost msg%e]$ i* o get this6
5.AIM:
3er&orm soc8et programming using U>3?
PROGRAM
udp-sererc
#include <stdio!"
#include <stdli!"
#include <errno!"
#include <string!"
#include <s$s%t$pes!"
#include <s$s%soc8et!"
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UNIX INTERNALS LAB
#include <netinet%in!"
#include <arpa%inet!"
#include <s$s%Cait!"
#include <&cntl!"
#include <signal!"
#de&ine BU9SIE (50
#de&ine 'D3:RT 555)
#de&ine 'AXNA'E 5))
int main*int c!ar OO +
,
int sdnret.
struct soc8addr-in sereraddresscliaddr.
soc8len-t lengt!.
c!ar clientname/'AXNA'E1datareceied/BU9SIE1.
sd 7 soc8et* A9-INET S:;->RA' ) +.
i&* sd < ) +
,
perror* 2soc8et2 +.
e4it* 5 +.
6
memset* Zsereraddress ) siPeo&*sereraddress+ +.
memset* Zcliaddr ) siPeo&*cliaddr+ +.
sereraddresssin-&amil$ 7 A9-INET.
sereraddresssin-port 7 !tons*'D3:RT+.%%3:RT N:
sereraddresssin-addrs-addr 7 !tonl*INA>>R-AND+.%%I3 A>>RESS
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UNIX INTERNALS LAB
ret7ind*sd*struct soc8addrO+ZsereraddresssiPeo&*sereraddress++.
i&*ret<)+
,
perror*2BIN> 9AILS2+.
e4it*5+.
6
&or*..+
,
print&*2I am Caiting@n2+.
%OReceied a datagramO%
lengt!7siPeo&*cliaddr+.
n7rec&rom*sddatareceiedBU9SIE) *struct soc8addrO+Zcliaddr Zlengt!+.
print&*2>ata Receied &rom s@n2 net-ntop*A9-INETZcliaddrsin-addr
clientnamesiPeo&*clientname+++.
%OSending t!e Receied datagram ac8O%
datareceied/n17@).
print&*2I !ae receied s@n2datareceied+.
sendto*sddatareceiedn)*struct soc8addr O+Zcliaddrlengt!+.
6
6
udp-clientc
#include <stdio!"
#include <stdli!"
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UNIX INTERNALS LAB
#include <errno!"
#include <string!"
#include <s$s%t$pes!"
#include <s$s%soc8et!"
#include <netinet%in!"
#include <arpa%inet!"
#include <&cntl!"
#include <signal!"
#include <unistd!"
#de&ine BU9SIE (50
static oid sig-usr*int+.
oid str-cli*9ILE O&p int soc8&d struct soc8addr Oserer soc8len-t len+.
int main* int c!ar Oarg/1 +
,
int sd.
struct soc8addr-in sereraddress.
%OInstalling signal =andlersO%
signal*SI3I3Esig-usr+.
signal*SIINTsig-usr+.
i& *NULL77arg/51+
,
print&*23lease enter t!e I3 Address o& t!e serer@n2+.
e4it*)+.
6
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UNIX INTERNALS LAB
i& *NULL77arg/01+
,
print&*23lease enter t!e 3ort Numer o& t!e serer@n2+.
e4it*)+.
6
sd 7 soc8et* A9-INET S:;->RA' ) +.
i&* sd < ) +
,
perror* 2soc8et2 +.
e4it* 5 +.
6
memset* Zsereraddress ) siPeo&*sereraddress+ +.
sereraddresssin-&amil$ 7 A9-INET.
sereraddresssin-port 7 !tons*atoi*arg/01++.%%3:RT N:
sereraddresssin-addrs-addr 7 inet-addr*arg/51+.%%A>>RESS
print&*2lient Starting serice@n2+.
print&*2Enter >ata 9or t!e serer@n2+.
str-cli*stdinsd *struct soc8addr O+Zsereraddress siPeo&*sereraddress++.
6
static oid sig-usr* int signo+ %OSignal NumerO%
,
c!ar Ostrpipe72REEIE> SI3I3E H ERR:R2.
c!ar Ostrctrl72REEIE> TRLH 9R:' D:U2.
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UNIX INTERNALS LAB
i&*signo77SI3I3E+
,
Crite*5strpipestrlen*strpipe++.
e4it*5+.
6
else i&*signo77SIINT+
,
Crite*5strctrlstrlen*strctrl++.
e4it*5+.
6
6
oid str-cli*9ILE O&p %O=ere to e used as stdin as argumentO%
int soc8&d
struct soc8addr Oto soc8len-t lengt!+ %Oonnection Soc8et O%
,
int ma4desn.
&d-set rset.
c!ar sendu&/BU9SIE1 recu&/BU9SIE1 serername/5))1.
struct soc8addr-in sereraddr.
soc8len-t slen.
9>-ER:*Zrset+.
ma4des7*soc8&d"&ileno*&p+?soc8&dY5M&ileno*&p+Y5+.
&or*..+
,
9>-SET*&ileno*&p+ Zrset+.
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UNIX INTERNALS LAB
9>-SET*soc8&d Zrset+.
select*ma4desZrsetNULLNULLNULL+.
i&*9>-ISSET*soc8&d Z rset++
,
slen7siPeo&*sereraddr+.
n7rec&rom*soc8&drecu&BU9SIE) *structsoc8addrO+ZsereraddrZslen+.
print&*2>ata Receied &rom serer sM@n2
inet-ntop*A9-INETZsereraddrsin-addr
serernamesiPeo&*serername+++.
Crite*5recu&n+.
print&*2Enter >ata 9or t!e serer@n2+.
6
i&*9>-ISSET*&ileno*&p+ Z rset++
,
%OReading data &rom t!e 8e$oardO%
&gets*sendu&BU9SIE&p+.
n 7 strlen *sendu&+.
%OSending t!e read data oer soc8etO%
sendto*soc8&dsendu&n)tolengt!+.
print&*2>ata Sent To Serer@n2+.
6
6
6
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UNIX INTERNALS LAB
EXECUTION STEPS:
8P Clie)t Se7'e7 Applicatio)+
Compiling and running server.
[se7@localhost 9ee:#]$ 'i *p(se7'e7+c
[se7@localhost 9ee:#]$ cc *p(se7'e7+c
[se7@localhost 9ee:#]$ m' a+ot *p(se7'e7
[se7@localhost 9ee:#]$ +, *p(se7'e7
; am 9aiti)g
ata Recei'e* <7om 12!+++1
; ha'e 7ecei'e* a=c* e<gh
7e' is
hg<e *c=a
; am 9aiti)g
Compiling and running client.
se7@localhost 9ee:#]$ 'i *p(clie)t+c
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UNIX INTERNALS LAB
se7@localhost 9ee:#]$ cc *p(clie)t+c
[se7@localhost 9ee:#]$ m' a+ot *p(clie)t
[se7@localhost 9ee:#]$ +, *p(clie)t 12!+++1 11!1
Clie)t Sta7ti)g se7'ice
E)te7 ata >o7 the se7'e7
a=c* e<gh
ata Se)t To Se7'e7
ata Recei'e* <7om se7'e7 12!+++1-
a=c* e<gh
6.AIM:
3er&orm soc8et programming using T3 ?
PROGRAM
tcpserselect)5c
#include <stdio!"
#include <stdli!"
#include <unistd!"
#include <errno!"
#include <string!"
#include <s$s%t$pes!"
#include <s$s%stat!"
#include <s$s%select!"
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UNIX INTERNALS LAB
#include <s$s%time!"
#include <s$s%soc8et!"
#include <netinet%in!"
#include <arpa%inet!"
#include <&cntl!"
#de&ine 'AXLINE 5))
#de&ine SER-3:RT 5G5(G
int main*int argc c!ar OOarg+
,
int 8 i ma4i ma4&d listen&d conn&d soc8&d.
int nread$ client/9>-SETSIE1.
ssiPe-t n.
&d-set rset allset.
c!ar line/'AXLINE1u&/5))1.
soc8len-t clilen.
struct soc8addr-in cliaddr seraddr.
listen&d 7 soc8et*A9-INET S:;-STREA' )+.
i& *listen&d < ) +
,
perror*2soc8et2 +.
e4it*5+.
6
Pero*Zseraddr siPeo&*seraddr++.
seraddrsin-&amil$ 7 A9-INET.
seraddrsin-addrs-addr 7 !tonl*INA>>R-AND+.
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UNIX INTERNALS LAB
seraddrsin-port 7 !tons*SER-3:RT+.
ind*listen&d *struct soc8addr O+ Zseraddr siPeo&*seraddr++.
listen*listen&d(+.
ma4&d 7 listen&d. %O initialiPe O%
ma4i 7 H5. %O inde4 into client/1 arra$ O%
&or *i 7 ). i < 9>-SETSIE. iYY+
client/i1 7 H5. %O H5 indicates aailale entr$ O%
9>-ER:*Zallset+.
9>-SET*listen&d Zallset+.
%O end &ig)5 O% %O include &ig)0 O%
&or * . . +
,
print&*2SererMI am CaitingHHHHHStart o& 'ain Loop@n2+.
rset 7 allset. %O structure assignment O%
nread$ 7 select*ma4&dY5 Zrset NULL NULL NULL+.
i& *9>-ISSET*listen&d Zrset++ , %O neC client connection O%
clilen 7 siPeo&*cliaddr+.
conn&d 7 accept*listen&d *struct soc8addr O+ Zcliaddr Zclilen+.
#i&de& N:T>E9
print&*2neC clientM s port d@n2 inet-ntop*A9-INET cliaddrsin-addr u& NULL+ nto!s*cliaddrsin-port++.
#endi&
&or *i 7 ). i < 9>-SETSIE. iYY+
i& *client/i1 < )+
,
client/i1 7 conn&d. %O sae descriptor O%
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UNIX INTERNALS LAB
rea8.
6
i& *i 77 9>-SETSIE+
,
print&*2too man$ clients2+.
e4it*)+.
6
9>-SET*conn&d Zallset+. %O add neC descriptor to set O%
i& *conn&d " ma4&d+
ma4&d 7 conn&d. %O &or select O%
i& *i " ma4i+
ma4i 7 i. %O ma4 inde4 in client/1 arra$ O%
i& *HHnread$ <7 )+
continue. %O no more readale descriptors O%
6
&or *i 7 ). i <7 ma4i. iYY+
,
%O c!ec8 all clients &or data O%
i& * *soc8&d 7 client/i1+ < )+
continue.
i& *9>-ISSET*soc8&d Zrset++
,
i& * *n 7 read*soc8&d line 'AXLINE++ 77 )+
,
%Oconnection closed $ client O%
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UNIX INTERNALS LAB
close*soc8&d+.
9>-LR*soc8&d Zallset+.
client/i1 7 H5.
6
else
,
print&*2@n output at serer@n2+.
&or*87).line/81K7@).8YY+
print&*2c2toupper*line/81++.
Crite*soc8&d line n+.
6
i& *HHnread$ <7 )+
rea8. %O no more readale descriptors O%
6
6
6
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UNIX INTERNALS LAB
tcpclientc
#include <stdio!"
#include <stdli!"
#include <unistd!"
#include <errno!"
#include <string!"
#include <s$s%t$pes!"
#include <s$s%stat!"
#include <s$s%soc8et!"
#include <netinet%in!"
#include <arpa%inet!"
#include <&cntl!"
#de&ine 'AXBU99ER 5)0
oid sendstring*int c!ar O+.
int main* int c!ar O/1 +
,
int sd&d.
c!ar c.
struct soc8addr-in sereraddress.
c!ar te4t/5))1.
int i7).
sd 7 soc8et* A9-INET S:;-STREA' ) +.
i&* sd < ) +
,
perror* 2soc8et2 +.
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UNIX INTERNALS LAB
e4it* 5 +.
6
i& */51 77 NULL +
,
print& *23L spec&i$ t!e serers I3 Address @n2+.
e4it*)+.
6
i& */01 77 NULL +
,
print& *23L speci&$ t!e serers 3ort No @n2+.
e4it*)+.
6
memset* Zsereraddress ) siPeo&*sereraddress+ +.
sereraddresssin-&amil$ 7 A9-INET.
sereraddresssin-port 7 !tons*atoi*/01++.%%3:RT N:
sereraddresssin-addrs-addr 7 inet-addr*/51+.%%A>>RESS
i& *connect*sd*struct soc8addrO+Zsereraddress siPeo&*sereraddress++<)+
,
print&*2annot onnect to serer2+.
e4it*5+.
6
print&*2enter sentence to end enter #2+.
C!ile*5+
,
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UNIX INTERNALS LAB
c7getc!ar*+.
i&*c77#+
rea8.
te4t/iYY17c.
6
te4t/i17@).
sendstring*sdte4t+.
close*sd+.
return ).
6
oid sendstring * int sd c!ar O&name+ %OSoc8et >escriptorO% %OArra$ ontaining t!estring O%
,
int n $tesCritten7) Critten .
c!ar u&&er/'AXBU99ER1.
strcp$*u&&er &name+.
n7strlen*u&&er+.
C!ile *$tesCritten<n+
,
Critten7Crite*sd u&&erY$tesCritten*nH$tesCritten++.
$tesCrittenY7Critten.
6
print&*2String M s sent to serer @n2u&&er+.
6
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UNIX INTERNALS LAB
EXECUTION STEPS:
+ oncurrent Serer Application Using Select
Compiling an !"nning #$!%$!.
rootQlocal!ost Cee8and1# i tcpserselect)5c
rootQlocal!ost Cee8and1# cc tcpserselect)5c
/rootQlocal!ost Cee8and1# m aout tcpserselect5
/rootQlocal!ost Cee8and1# %tcpserselect5
SererMI am CaitingHHHHHStart o& 'ain Loop
SererMI am CaitingHHHHHStart o& 'ain Loop
output at serer
acd
SererMI am CaitingHHHHHStart o& 'ain Loop
Compiling an !"nning Cli$n&.
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UNIX INTERNALS LAB
7oot@localhost 9ee:!a)*"]? 'i tcpclientc
7oot@localhost 9ee:!a)*"]? cc tcpclientc
[7oot@localhost 9ee:!a)*"]? m' a+ot tcpclient
rootQlocal!ost Cee8and1# %tcpclient 50))5 5G5(G
enter sentence to end enter #acd#
String M acd sent to serer
'.AIM:
Write a program &or process creation and process e4ecution &or displa$ enironment
ariales
PROGRAM
#include<stdio!"
int main*int argc c!ar Oarg/1c!ar Oen/1+
,
int i.
print&*2 m$ os enironmentM @n2+.
&or*i7).en/i1.iYY+
print&*2s@n2 en/i1+.
return ).
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UNIX INTERNALS LAB
6
#include<stdio!"
e4tern c!ar OO eniron.
int main*+
,
int i.
print&*2 m$ os enironment@n2+.
&or*i7).eniron/i1.iYY+
print&*2s@n2eniron/i1+.
return ).
6
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UNIX INTERNALS LAB
EXECUTION STEPS:
[sampath@localhost ipc]$ i en5c
[sampath@localhost ipc]$ cc en5c
[sampath@localhost ipc]$ %aout
m$ os enironment
[sampath@localhost ipc]$ i en0c
[sampath@localhost ipc]$ cc en0c
[sampath@localhost ipc]$ %aout
m$ os enironment
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UNIX INTERNALS LAB
AIM:
Write a program on process creation and e4ecution &or implement di&&erent t$pes o& e4ecution&unction
PROGRAM
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UNIX INTERNALS LAB
#include<stdio!"
#include<unistd!"
int main*+
,
c!ar Oconst arg/1 7,2one22tCo2*c!arO+)6.
e4ec*2%arg2arg+.
print&*2 displa$ read line ariales@n2+.
return ).
6
#include<unistd!"
int main*+
,
e4ecl*2%!ello2252*c!ar O+)+.
print&*2 displa$ read line ariales@n2+.
6
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UNIX INTERNALS LAB
EXECUTION STEPS:
[sampath@localhost ipc]$ i en5c
[sampath@localhost ipc]$ cc en5c
[sampath@localhost ipc]$ %aout
displa$s read line ariales
[sampath@localhost ipc]$ i en0c
[sampath@localhost ipc]$ cc en0c
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UNIX INTERNALS LAB
[sampath@localhost ipc]$ %aout
displa$s read line ariales
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UNIX INTERNALS LAB
(. AIM:
Write a program to create &ile and modi&$ and to delete record
PROGRAM
#include<stdio!"
int main*int argc c!ar Oarg/1+
,
c!ar c!.
9ILE O&p.
&p7&open*arg/512r2+.
i&*&p77NULL+
,
print&*2&ile does not e4it@n2+.
return ).
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UNIX INTERNALS LAB
6
C!ile*K&eo&*&p++
,
c!7&getc*&p+.
print&*2c2c!+.
6
&close*&p+.
return ).
6
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UNIX INTERNALS LAB
EXECUTION STEPS:
[sampath@localhost ipc]$ i &ilec
[sampath@localhost ipc]$ cc &ilec
[sampath@localhost ipc]$ %aout
&ile does not e4ist
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UNIX INTERNALS LAB
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UNIX INTERNALS LAB
1).AIM:
Write a program to &ind status and mode alue o& a &ile
PROGRAM
#include<stdio!"
#include<string!"
#include<stdli!"
#include<&cntl!"
c!ar data/51.
c!ar str/5)01.
int main*int argcc!ar Oarg/1+
,
int count.
int c!.
int &d.
int poslen.
i&*argcK70+
,
print&*2command reVuires tCo arguments%n2+.
e4it*5+.
6
&d7open*arg/51:-R>WR+.
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UNIX INTERNALS LAB
i&*&d<)+
,
print&*2&ile does not e4it%n2+.
e4it*0+.
6
do
,
print&*2@n@t9ile :perations@n2+.
print&*2@tRead5@n2+.
print&*2@tWrite0@n2+.
print&*2@tE4itG@n2+.
print&*2Enter $our c!oice*5HG+M2+.
scan&*2d2Zc!+.
sCitc!*c!+
,
case 5 M
print&*2Enter &ile position in $teM2+.
scan&*2d2Zpos+.
print&*2Enter numer o& $te to readM2+.
scan&*2d2Zlen+.
lsee8*&dposH5SEE;-SET+.
count7).
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UNIX INTERNALS LAB
C!ile*read*&ddata5+")+
,
countYY.
Crite*5data5+.
i&*count77len+rea8.
6
rea8.
case 0 M
print&*2Enter t!e position to CriteM2+.
scan&*2d2Zpos+.
print&*2Enter t!e string toCrite into to &ileM2+.
scan&*2s2str+.
lsee8*&dposH5SEE;-SET+.
Crite*&dstrstrlen*str++.
rea8.
case G M
e4it*)+.
de&aultM
print&*2Inalid c!oice Tr$ again%n2+.
6
6C!ile*5+.
e4it*)+.
6
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UNIX INTERNALS LAB
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UNIX INTERNALS LAB
EXECUTION STEPS:
[sampath@localhost ipc]$ i sm&c
[sampath@localhost ipc]$ cc sm&c
[sampath@localhost ipc]$ %aout
ommand reVuires tCo arguments
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UNIX INTERNALS LAB
55 AIM:
Write a program to &ind C!et!er a &ile is !aing read Crite e4ecute permissions and alsoc!ec8 C!et!er t!e gien name is &ile or director$
PROGRAM
#include<stdio!"
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UNIX INTERNALS LAB
#include<s$s%t$pes!"
#include<s$s%stat!"
#include<stdli!"
#include<&cntl!"
#include<strings!"
#include<unistd!"
struct stat su&5su&0.
int main*int argc c!ar Oarg/1+
,
int &d5&d0.
int i[.
c!ar O&lines5O&lines0.
i&*argc<G+
,
print&*23rogram reVuires atleast 0 arguments2+.
e4it*)+.
6
&or*i75.i<argcH5.iYY+
,
&d57open*arg/i1:-R>:NLD+.
i&*&d5<)+ continue.
&lines57malloc*su&5st-siPe+.
&stat*&d5Zsu&5+.
read*&d5&lines5su&5st-siPe+.
&or*[7iY5.[<argc.[YY+
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UNIX INTERNALS LAB
,
&d07open*arg/[1:-R>:NLD+.
i&*&d0<)+ continue.
&stat*&d0Zsu&0+.
i&*su&5st-siPe77su&0st-siPe+
,
&lines07malloc*su&0st-siPe+.
read*&d0&lines0su&0st-siPe+.
close*&d0+.
i&*cmp*&lines5&lines0su&0st-siPe+77)+
unlin8*arg/[1+.
&ree*&lines0+.
6
6
close*&d5+.
&ree*&lines5+.
6
e4it*)+.
6
EXECUTION STEPS:
[sampath@localhost ipc]$ i &rdc
[sampath@localhost ipc]$ cc &rdc
[sampath@localhost ipc]$ %aout
3rogram reVuires at least 0 arguments
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UNIX INTERNALS LAB
50 AIM:
Write a program to create a &or8 &unction and to displa$ c!ild process id parent process idroot id
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UNIX INTERNALS LAB
PROGRAM
#include<stdio!"
#include<unistd!"
int main*int argc c!ar Oarg/1+
,
int ipidalue.
sscan&*arg/512d2Zalue+.
&or *i7).i<alueH5.iYY+
,
pid7&or8*+.
i&*pid77)+
,
print&*2Im c!ild '$ pid7d@t2getpid*++.
print&*2'$ parent pid7d@t 2getppid*++.
print&*2'$ roupid7d@n 2getgid*++.
6
else
Cait*+.
6
return ).
6
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UNIX INTERNALS LAB
EXECUTION STEPS:
[sampath@localhost ipc]$ i &or8c
[sampath@localhost ipc]$ cc &or8c
[sampath@localhost ipc]$ %aout
Im c!ild '$ pid 7 JG((
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UNIX INTERNALS LAB
'$ parent pid 7 JG(G
'$ roupid 7JG()