program coding

7/29/2019 Program Coding

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411711205000

Program coding://implementation of fork(),exe(),wait system call#includeint main()

{int pid;printf("\nwelcome");pid=fork();printf("\n process id is:%d",pid);if(pid


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Output:[prince20@localhost ~]$ cc sc.c[prince20@localhost ~]$ ./a.out

welcomeprocess id is:0welcomeprocess id is:5398

\ client.c file2 jp packet.c rpc.x simp_svc.caa.c creat.c flwr large.c packets.c rpc_xdr.c simp.xACE cse getpid.c larger.c pp sc.c simp_xdr.ca.out datec.c great.c ls pp.c ser3.c sjfasds dates.c grep.c make.c priority.c server sjf.casia dnsc.c gsc.c maki.c process.c server1.c stat.cchatc.c dnss.c iosc.c making.c rpc2.x server2.c sumchats.c dp iosc.h mksc.c rpcc.c server3.c systemcl3.c echoc.c iosc.h.gch ocsc.c rpc_clnt.c short.c udp.cclient echos.c it open rpc.h simpc.c udpc.cclient1.c fcfs.c j open.c rpcint.c simp_clnt.c udps.cclient2.c file jana oper?n rpcs.c simp.hclient3.c file1 jaya os rpc_svc.c simps.cparent processrecsived terminal staus of parent process

end[prince20@localhost ~]$


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Program coding:#includeint main(){

int pid;pid=getpid();printf("\n process id is %d",pid);}


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Output:"gsc.c" 7L, 91C written[prince20@localhost ~]$ cc gsc.c[prince20@localhost ~]$ ./a.out

process id is 5501[prince20@localhost ~]$


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program coding:#include#includemain()

{DIR *dp;struct dirent *d;dp=opendir("dp");if(dp==NULL)printf("\n directory not available");else{printf("\n content of the directory");while((d=readdir(dp))!=NULL)printf("\n %s \n",d->d_name);}closedir(dp);}


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Output:[prince01@localhost ~]$ cc op.c[prince01@localhost ~]$ ./a.out

contents of the directory..

flowers

.[prince01@localhost ~]$


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411711205000

Program coding:#include#includemain()

{char buf[100];getcwd(buf,100);printf("\n current working directory %s",buf);mkdir("cse");chdir("cse");getcwd(buf,100);printf("\n directory changed");printf("\n current working directory is %s",buf);}


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Output:

[prince01@localhost ~]$ cc mk.c[prince01@localhost ~]$ ./a.out

current working directory /home/prince01directory changedcurrent working directory is /home/prince01/cse[prince01@localhost ~]$


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411711205000

program coding:#include#include

#include#includeint main(){int fd;char buf1[100],fname[30];char buf2[]="operating system";printf("\n enter the file name");scanf("%s",fname);if((fd=creat(fname,S_IRWXU))


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Output:"io.c" 29L, 478C writtenprince13@localhost ~]$ cc io.c

[prince13@localhost ~]$ ./a.out

enter the file namesystem

contents written successfullythe contents is operating system[prince13@localhost ~]$


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411711205000

Program coding:#include#include

#includemain(){struct stat*s;char *f;printf("\n enter the file name");scanf("%s",&f);stat(f,s);printf("\nlast access time:%d",s->st_atime);printf("\n last modified time:%d",s->st_mtime);printf("\n no of links:%d",s->st_nlink);}


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Output:"stat.c" 14L, 291C written[prince20@localhost ~]$ cc stat.c

[prince20@localhost ~]$ ./a.out

enter the file nameabcd

last access time:-331011108last modified time:1157826629no of links:-2062790005[prince20@localhost ~]$


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411711205000

Program coding:#include#include

#includeint main( int argc){int ch,n,c;int i;do{printf("\n 1.list of files \n2.list pattern of file");printf("\n do u want to continue?(yes=1,no=0)");scanf("%d",&c);printf("\n enter your choice");scanf("%d",&n);DIR*dp;struct dirent*dirp;switch(n){case 1:if(argc==1)

{dp=opendir("./");

while((dirp=readdir(dp))!=NULL)printf(" %s\t",dirp->d_name);}elseprintf("\n error having too many parameters");break;

case 2:system("grep asia jana" );break;default:

exit(0);}}while(c==1);}


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Output:

"grep.c" 35L, 625C written[prince01@localhost ~]$ cc grep.c

grep.c: In function main:grep.c:31: warning: incompatible implicit declaration of built-in function exit[prince01@localhost ~]$ ./a.out

1.list of files2.list pattern of filedo u want to continue?(yes=1,no=0)1

enter your choice1gg.c rint_svc.c sys.c first.c .sjf.c.swp .ab11.c.swo.dnsc.c.swp dtc.c system.c it jana job.c dnsc.h .pac.c.swo pri.c sa.c pac.c server r.c .bash_logout gre.c grep.csimp.h rpcmc.c .usc.c.swp mk.c .lesshst rint_clnt.c


enter your choice2asia is continenti like asia


enter your choice3

[prince01@localhost ~]$


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411711205000

Program coding:#includemain(){

int n,a[10],b[10],t[10],w[10],g[10],i,m;float att=0,awt=0;for(i=0;i


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printf("\n");printf("\n %d",w[i]);printf("\t");for(i=1;i


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Output:"first.c" 51L, 937C written[prince01@localhost ~]$ cc first.c[prince01@localhost ~]$ ./a.out

enter the number of process:3

enter the burst time:1

enter the arrival time:1





process waiting time turn around time

1 -1 02 -1 1

3 0 3average waiting time:-0.666667msaverage turn around time:1.333333msgantt chart......

2 3 0

0 0

.......



18/22

411711205000

Program coding:#include#includestatic int w;

int twt,ttt,a[20],wt[20],n,bu[20];float att,awt;char pname[20][20];void getdata();void SJF();void getdata(){int i;printf("/n enter the number of process:");scanf("%d",&n);for(i=1;i


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{temp=b[j-1];temp1=a[j-1];b[j-1]=b[j];

a[j-1]=a[j];b[j]=temp;a[j]=temp1;strcpy(c[j-1],pname[j-1]);strcpy(pname[j-1],pname[j]);strcpy(pname[j],c[j-1]);}}}wt[1]=0;w=w+b[1];t=w;s[1]='F';while(w


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411711205000

printf("\n...........\n");for(i=1;i


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Output:"job.c" 103L, 1534C written[prince08@localhost ~]$ cc job.c[prince08@localhost ~]$ ./a.out

/n enter the number of process:4

enter the process name:aenter the burst time for process a=8enter the arrival name for process:a=0

enter the process name:benter the burst time for process b=4enter the arrival name for process:b=3

enter the process name:center the burst time for process c=6enter the arrival name for process:c=4

enter the process name:denter the burst time for process d=5enter the arrival name for process:d=2

shortest job scheduling:

average waiting time=12.750000msaverage turn around time 7.000000ms

gannt chart...........| a | b | d | c

...........

0 8 12 17............



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program coding

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