Department of Computer Application SRM University MC0618 Unix and Network Programming

Transcription

1 Expt. No. : 01 File Copy Aim file. To Write a unix networking program to copy the content of one file to another Algorithm Step 1 Declare the file descriptors fd1,fd2, buffer, character variable c. Step 2 Step 3 Step 4 Step 5 Call Open function to open file1, and assign the file descriptor value to fd1. Call Open function to open file2, and assign the file descriptor value to fd2. Repeat 4.1 Call read for fd1 until an error occurred or null value returned. 4.2 Call write for fd2 until an error occurred or a null value returned. Stop.

2 Program #include<sys/stat.h> #include<sys/types.h> #include<fcntl.h> #include<stdio.h> #include<unistd.h> int main(int argc,char *argv[]) int fd1,fd2,n; char c,buff[10]; if(argc<3 argc>3) printf("error copy source file,destination file\n"); return 0; fd1=open(argv[1],o_rdonly); if(fd1<0) printf("source file does not exit"); return 0; fd2=open(argv[2],o_wronly O_CREAT O_EXCL 0644); if(fd2<0) printf("destination file exists overwrite(y/n)"); scanf("%c",&c); if(c=='n') printf("file not copied"); return 0; else

3 fd2=open(argv[2],o_wronly O_CREAT 0644); while((n=read(fd1,buff,10))>0) write(fd2,buff,n); printf("file copied successfully\n"); close(fd1); close(fd2); OutPut : [mca08009@mcalinux amit09]$ cc filecopy.c [mca08009@mcalinux amit09]$./a.out filecopy.c file1.c File Copied Successfully. [mca08009@mcalinux amit09]$

4 Expt. No. : 02 Appending the File Aim file. To Write a unix networking program to append the content of one file to another Algorithm Step 1 Declare the file descriptors fd1, buffer, character variable c. Step 2 Step 3 Step 4 Step 5 Call Open function to open file1 in O_APPEND mode, and assign the file descriptor value to fd1. Call read for fd1 until an error occurred or null value returned Repeat 4.1 Read data from user until break key is pressed. 4.2 Call write for fd2. Stop.

5 Program #include<sys/stat.h> #include<sys/types.h> #include<stdio.h> #include<fcntl.h> #include<unistd.h> int main(int argc,char *argv[]) int fd; char buff[100]; if(argc>3 argc<3) printf("error.the file can not be appended"); eturn 0; fd=(argv[1],o_wronly O_APPEND); if(fd<0) printf("file does not exist"); return 0; else int i=0; printf("enter text to append file"); do scanf("%c",&buff[i]); if(buff[i]=='.') break; i++; while(1); write(fd,buff,i); printf("text appended successfully");

6 return 0; close(fd); OutPut : Department of Computer Application [mca08009@mcalinux amit09]$cc appnd.c [mca08009@mcalinux amit09]$./a.out appnd.c file1.c Enter text to append file : Hi, this is amit mukherjee. Text appended successfully. [mca08009@mcalinux amit09]$

7 Type of The File Expt. No. : 03 Aim To Write a unix networking program to find the type of the file. Algorithm Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Declare the file descriptors fd1,stat type of buffer variable Call Open function to open file1, and assign the file descriptor value to fd1. Call lstat( ) function for fd1 to map stat structure for fd1. Check the file type using the st_mode member of fd1, Using different S_IS. Operations. Write the relevant file type. Stop.

8 Expt. No. : 03 Type of The File Program #include<stdio.h> #include<sys/stat.h> #include<sys/types.h> #include<unistd.h> #include<fcntl.h> int main(int argc, char *argv[]) int i; struct stat buf; char *ptr; printf("\n Finding file types \n"); for(i=1;i<argc ;i++) printf("\n Type of file \n"); printf("%s",argv[i]); if(lstat(argv[i], &buf)<0) printf("\n lstat user."); continue; if(s_isreg(buf.st_mode)) ptr="regular File"; else if(s_isdir(buf.st_mode)) ptr="directory File"; else if(s_ischr(buf.st_mode)) ptr="character File"; else if(s_isblk(buf.st_mode)) ptr="block File";

9 else if(s_isfifo(buf.st_mode)) ptr="fifo"; else if(s_islnk(buf.st_mode)) ptr="symbolic Link File"; else if(s_issock(buf.st_mode)) ptr="socket File"; else ptr="unknown File"; printf(" "); printf("\n\n%s\n\n",ptr); return 0; OutPut : [mca08009@mcalinux amit09]$ cc file_type.c [mca08009@mcalinux amit09]$./a.out file_type.c Finding file types Type of file file_type.c REgular File [mca08009@mcalinux amit09]$

10 Size of The Directory Expt. No. : 04 Aim To Write a unix networking program to find the size of the Directory. Algorithm Step 1. Step 2 Step 3 Step 4 Step 5 Step 6 Declare the stat type of buf, integer type of size and assign 0, i, bs, dirent type of *disp, DIR type of *dp variables. Call Opendir function to open directory, and assign the directory pointer to dp. Call readdir( ) function for dp, and assign the pointer value to disp. Call stat function for dip pointer, Assign the value of disp.st_size to variable size Write the value of size. Stop.

11 Expt. No. : 04 Size of The Directory Program #include<stdio.h> #include<sys/stat.h> #include<fcntl.h> #include<sys/types.h> #include<dirent.h> main() struct stat buf; int size=0, i=1, bs; struct dirent *disp; DIR *dp; dp=opendir((char *)get_current_dir_name()); if(dp==null) printf("\n Error."); return 0; while((disp=readdir(dp))!=null) stat(disp->d_name,&buf); size=size+(int)(buf.st_size); printf("\n Size of the directory :%d\n\n",size); closedir(dp);

12 OutPut : [mca08009@mcalinux amit09]$ cc size_dir.c [mca08009@mcalinux amit09]$./a.out size_dir.c Size of the directory :24177 [mca08009@mcalinux amit09]$ Expt. No. : 05 List of directories

13 Aim To Write a unix networking program to list the directories. Algorithm Step 1. Step 2 Step 3 Step 4 Declare the stat type of buf, integer type of size and assign 0, i, bs, dirent type of *disp, DIR type of *dp variables. Call Opendir function to open directory, and assign the directory pointer to dp. Call readdir( ) function for dp, and assign the pointer value to disp. Call stat function for dip pointer, Step 5 Step 6 Repeat Write the value of disp.st_names until end of directory. Stop. --

14 List Of Directories Program #include<stdio.h> #include<sys/stat.h> #include<fcntl.h> #include<sys/types.h> #include<dirent.h> int main() DIR *dp; struct dirent *disp; int i=1; dp=opendir((char *)get_current_dir_name()); if(dp==null) printf("\nimplementation of ls Command.\n"); return 0; while((disp=readdir(dp))!=null) printf("\n file %d;-%s",i,disp->d_name); i++; close(dp);

15 OutPut : [mca08009@mcalinux amit09]$ cc list_dir.c [mca08009@mcalinux amit09]$./a.out list_dir.c file 1;-size_dir.c file 2;-P25 file 3;-blk_signal file 4;-file_type.c file 5;-fork.c file 6;-blk_signal.c file 7;-P24 file 8;-nikks file 9;-\ file 10;-time.c file 11;-jump.c file 12;-pipe.c file 13;-a.out file 14;-fifo.c file 15;-signal.c file 16;-sleep.c file 17;-list_dir.c file 18;-list_dir.cclear file 19;-.. file 20;-.[mca08009@mcalinux amit09]$ -

16 Ex.No.6 Current Date And Time Aim To Write a unix networking program to display current date and time. Algorithm Step 1 Step 2 Declare the tm structure pointer variable *ptr; char type of s[25], time_t structure type of t. Call local time function to convert the time structure as system defined. Step 3 Call strftime function to convert to display format and assign to s. Step 4 Step 5 Display s Stop.

17 Expt. No. : 06 Current Date And Time #include<time.h> #include<stdio.h> #include<unistd.h> main() struct tm *ptr; char s[25]; time_t t; time(&t); printf("\n\ncurrent Date And Time :"); ptr=localtime(&t); strftime(s,25,"%x, %X %p",ptr); printf("%s\n\n",s); OutPut : [mca08009@mcalinux amit09]$ cc time.c [mca08009@mcalinux amit09]$./a.out time.c Current Date And Time :03/16/10, 23:37:16 PM [mca08009@mcalinux amit09]$ Ex.No.7 Implementation of set jump and long jump

18 Aim To Write a unix networking program to demonstrate the use of setjump and longjump fuctions Algorithm Step 1 Step 2 Declare globaly jmp_buf type of jmpbuffer,the function void cmd_add(void). Call setjump in main function by giving jumbuffer value as positive value Step 3 Call langjumb function in sub function. Step 4 Step 5 Display message Stop. Implementation of setjmp And longjmp Function

19 Program #include<stdio.h> #include<unistd.h> #include<sys/stat.h> #include<setjmp.h> #include<sys/types.h> jmp_buf jmpbuffer; void cmd_add(void); int main(void) if(setjmp(jmpbuffer)!=0) printf("error."); cmd_add(); return 0; void cmd_add(void) int f1,f2; printf("\n Enter First No.:"); scanf("%d",&f1); printf("\n Enter Second No. :"); scanf("%d",&f2); if(f2<0) longjmp(jmpbuffer,1); printf("result :%d\n\n",f1+f2); OutPut : [mca08009@mcalinux amit09]$ cc jump.c [mca08009@mcalinux amit09]$./a.out jump.c Enter First No.:5

20 Enter Second No. :6 Result :11 Department of Computer Application amit09]$ Ex.No.8 Aim Implementation of fork function To Write a unix networking program to demonstrate the use of fork function

21 Algorithm Step 1 Step 2 Step 3 Call fork function, assign the return value to pid check pid 2.1 Invoke child process for pid is Invoke papernt process for pid not 0. Stop Expt. No. : 08 Implementation of Fork Function

22 Program #include<stdio.h> #include<unistd.h> #include<sys/stat.h> int a=0, b=20; int main() int pid; printf("\n Process Before Fork. :"); printf("\n "); printf("\na=%d,b=%d",a,b); printf("\n\n\n\nafter Fork. :"); printf("\n "); pid=fork(); if(pid==0) a++;b++; printf("\n\nchild Processd."); printf("\n "); printf("\na=%d,b=%d\n",a,b); else a--;b--; printf("\n\nparent Process."); printf("\n "); printf("\na=%d,b=%d\n\n",a,b); return 0;

23 OutPut : [mca08009@mcalinux amit09]$ cc fork.c [mca08009@mcalinux amit09]$./a.out fork.c Process Before Fork. : A=0,B=20 After Fork. : Child Processd A=1,B= Parent Process A=-1,B=19 [mca08009@mcalinux amit09]$ Expt. No. : 09 Implementation of Signal Aim To Write a unix networking program to demonstrate the use of signal ( ) function

24 Algorithm Step 1 Step 2 Step 3 Call signal ( ) function, with parameter value SIGINT, SIGQUIT, SIGFPE Define sub processes Stop Expt. No. : 09 Implementation of Signal Program #include<stdio.h> #include<signal.h>

25 void add(int sig); void mul(int sig); void sub(int sig); int a,b; int main() printf("enter the value of a and b:"); scanf("%d%d",&a,&b); if (signal(sigint,add)==sig_err) printf("\nthe SIgnal error for addition"); if(signal(sigquit,mul)==sig_err) printf("\nsignal Error for multiplication."); if(signal(sigfpe,sub)==sig_err) printf("\nsignal Error for Subtraction."); for(;;) void add(int sig) printf("\nsigint signal is generated."); printf("\nthe value of addition=%d\n",a+b); signal(sigint,sig_dfl); void mul(int sig) printf("\nsigquit signal is generated."); printf("\nthe value after multiplication=%d\n",a*b); signal(sigquit,sig_dfl); void sub(int sig)

26 printf("\nsigfpe signal is generated."); printf("\nthe value after Subtraction=%d\n",a-b); signal(sigfpe,sig_dfl); OutPut : [mca08009@mcalinux amit09]$ cc signal.c [mca08009@mcalinux amit09]$./a.out signal.c Enter the value of a and b:5 4 Ctrl+c SIGINT signal is generated. The value of addition=9 Ctrl+\ SIGQUIT signal is generated. The value after multiplication=20 Blocking Signal Expt. No. : 10 Aim To Write a unix networking program to demonstrate blocking of signal and releasing

27 Algorithm Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Declar newmask, oldmask, penmask of type sigset_t Call sigemtyset for newmask to clear the signal set. Call sigaddset for the signal entered newly Call sigprocmask for newmask signal set by enabling SIG_BLOCK check the signal is in pending list by calling SIGPENDING Call Sigprocmask for oldmask set with parameter value as SIG_SETMASK. Display the message signal unblocked. Stop Expt. No. : 10 Blocking Signal Programs #include<stdio.h> #include<signal.h> #include<unistd.h>

28 #include<fcntl.h> void sigquit(int signo) printf("caught Sigquit."); signal(sigquit,sig_dfl); return; int main() sigset_t newmask, oldmask,penmask; signal(sigquit,sigquit); sigemptyset(&newmask); sigaddset(&newmask,sigquit); sigprocmask(sig_block,&newmask,&oldmask); sleep(5); sigpending(&penmask); if(sigismember(&penmask,sigquit)) printf("sigquit"); sigprocmask(sig_setmask,&oldmask,null); printf("sigquit is unblocked"); return(0); OutPut : [mca08009@mcalinux amit09]$./a.out blk_signal.c SIGQUIT is unblocked [mca08009@mcalinux amit09]$ Expt. No. : 11 #include<stdio.h> #include<signal.h> #include<time.h> #include<sys/stat.h> Implementation of Sleep Function

29 #include<sys/types.h> void sig_alarm(int); Department of Computer Application void main() int sec; printf("enter the seconds. :"); scanf("%d",&sec); sleep(sec); int sleep( int nsec) if(signal(sigalrm,sig_alarm)==sig_err) return (nsec); alarm(nsec); pause(); return; void sig_alarm(int signo) printf("alarm Delivered\n\n"); return; OutPut : [mca08009@mcalinux amit09]$ cc sleep.c [mca08009@mcalinux amit09]$./a.out sleep.c Enter the seconds. :3 Alarm Delivered Expt. No. : 12 #include<stdio.h> #include<fcntl.h> #include<sys/stat.h> void main() Implementation of Pipe

30 int p[2],pid; char c='a',d; pipe(p); pid=fork(); if(pid==0) close(p[0]); write(p[1],&c,1); printf("chlid Writes %c",c); else close(p[1]); read(p[0],&d,1); printf("\n Parent Reads %c",d); OutPut: amit09]$ cc pipe.c amit09]$./a.out pipe.c Chlid Writes A Parent Reads A Expt. No. : 13 #include<stdio.h> #include<fcntl.h> #include<sys/stat.h> Implementation of FIFO

31 void main() char b='x',d; int wfd,rfd; mkfifo("p25",o_creat 0644); if(fork()==0) wfd=open("p25",o_wronly); if(write(wfd,&b,1)==-1) printf("write Error."); else printf("\n Child Writes %c",b); rfd=open("p25",o_rdonly); if(read(rfd,&d,1)==-1) printf("\n Read Error."); printf("\n Parent Reads %c",d); printf("\n\n"); OutPut : [mca08009@mcalinux amit09]$ cc fifo.c [mca08009@mcalinux amit09]$./a.out fifo.c Child Writes x Parent Reads x

32 Expt. No. : 14 #include<sys/msg.h> #include<sys/types.h> #include<sys/ipc.h> #include<stdio.h> #include<string.h> #include<malloc.h> Message Queue

33 int main() struct msg long mtype; char mtext[20]; *mbuf; key_t msgid; int ch,t,no; char temp[20]; msgid=msgget((key_t)009,ipc_creat 0666); mbuf=malloc(sizeof(struct msg)); do printf("\n 1. Send msg\n 2. Receive msg \n 3.Exit"); printf("enter your choice"); scanf("%d",&ch); fflush(stdin); switch(ch) case 1: printf("enter the msg "); scanf("%s",temp); strcpy(mbuf->mtext,temp); fflush(stdin); printf("\n Enter the type of msg "); scanf("%d",&mbuf->mtype); /* printf("%d",msgid);*/ t=msgsnd(msgid,mbuf,10,ipc_nowait); if (t<0) printf("\n Error"); break; case 2: printf("\n Enter the msg no:"); scanf("%d",&no); t=msgrcv(msgid,mbuf,20,0,ipc_nowait); if(t<0) printf("\n Error in receiving ");

34 else printf("msg received :%s\n,mbuf->mtext"); break; case 3: return 0; while(ch!=3); return 0; OutPut : [mca08009@mcalinux amit09]$cc msg_q.c [mca08009@mcalinux amit09]$./a.out msg_q.c 1. Send msg 2. Receive msg 3. Exit Enter your choice :1 Enter the msg :Amit Mukherjee Enter the type of msg :1 Enter your choice :2 Enter the msg no. :1 Message Received Amit Mukherjee [mca08009@mcalinux amit09]$