client /server pipes Post: 302228242

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Top Forums Programming client /server pipes Post 302228242 by tolkki on Saturday 23rd of August 2008 04:12:44 PM

08-23-2008

Registered User

client /server pipes

here is the concept:

the client reads a pathname from the standard input and writes it to pipe1.The server reads this pathname from the pipe1 and tries to open the file for reading.If the server can open the file ,the server responds by reading the file and writting it to pipe2;otherwise the server writes an error message to the same pipe.The client then reads from the pipe2 and writes it receives to the standard output

here is my code:

Code:

#include <stdio.h>
#include <string.h>
#define maxsize 1000

char buffer [maxsize];

void client(int readfd,int writefd)
{
   puts("give pathname:");
   gets(buffer);

   write(writefd,buffer,strlen(buffer));
   //sleep(10);
   while((read(readfd,buffer,strlen(buffer)))>0);
     printf("%s/n",buffer);

}

void server(int readfd,int writefd)
{
   FILE * fp;
   char line[100];
   //sleep(10);
   read(readfd,buffer,strlen(buffer));
   fp=fopen(buffer,"r");
   if(fp==NULL)
   {
       strcpy(buffer,"cannot oepn file");
       write(writefd,buffer,strlen(buffer));
   }
   else
     while(fgets(line,100,fp)!=NULL)
       write(writefd,line,100);
}

int main()
{
    int pipe1[2],pipe2[2];
    int childpid;
    int status;
    pipe(pipe1);
    pipe(pipe2);
    childpid=fork();
    if(childpid>0)
    {
        close(pipe1[0]);
        close(pipe2[1]);
        client(pipe2[0],pipe1[1]);
        wait(&status);
        exit(0);
    }
    else
    {
        close(pipe1[1]);
        close(pipe2[0]);
        server(pipe1[0],pipe2[1]);
        exit(0);
    }

}

Actually ,I understand that there might be some problems with race conditions that's why i put 2 sleep commands but still doesn't work..
generally i want to sychronize the read and write commands of the client and server but I don't know how...
if someone has the time to see the code and give me some advice,it will really be appreciated.....thanks in advance..

tolkki

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LEARN ABOUT CENTOS

tapset::nfs_proc

tapset::nfs_proc(3stap) 												   tapset::nfs_proc(3stap)

NAME

       tapset::nfs_proc - systemtap nfs_proc tapset

DESCRIPTION

       nfs.proc.lookup
	      NFS client opens/searches a file on server

	       See probe::nfs.proc.lookup(3stap)
	       for details.

       nfs.proc.read
	      NFS client synchronously reads file from server

	       See probe::nfs.proc.read(3stap)
	       for details.

       nfs.proc.write
	      NFS client synchronously writes file to server

	       See probe::nfs.proc.write(3stap)
	       for details.

       nfs.proc.commit
	      NFS client committing data on server

	       See probe::nfs.proc.commit(3stap)
	       for details.

       nfs.proc.read_setup
	      NFS client setting up a read RPC task

	       See probe::nfs.proc.read_setup(3stap)
	       for details.

       nfs.proc.read_done
	      NFS client response to a read RPC task

	       See probe::nfs.proc.read_done(3stap)
	       for details.

       nfs.proc.write_setup
	      NFS client setting up a write RPC task

	       See probe::nfs.proc.write_setup(3stap)
	       for details.

       nfs.proc.write_done
	      NFS client response to a write RPC task

	       See probe::nfs.proc.write_done(3stap)
	       for details.

       nfs.proc.commit_setup
	      NFS client setting up a commit RPC task

	       See probe::nfs.proc.commit_setup(3stap)
	       for details.

       nfs.proc.commit_done
	      NFS client response to a commit RPC task

	       See probe::nfs.proc.commit_done(3stap)
	       for details.

       nfs.proc.open
	      NFS client allocates file read/write context information

	       See probe::nfs.proc.open(3stap)
	       for details.

       nfs.proc.release
	       NFS client releases file read/write context information

	       See probe::nfs.proc.release(3stap)
	       for details.

       nfs.proc.handle_exception
	      NFS client handling an NFSv4 exception

	       See probe::nfs.proc.handle_exception(3stap)
	       for details.

       nfs.proc.create
	      NFS client creating file on server

	       See probe::nfs.proc.create(3stap)
	       for details.

       nfs.proc.remove
	      NFS client removes a file on server

	       See probe::nfs.proc.remove(3stap)
	       for details.

       nfs.proc.rename
	      NFS client renames a file on server

	       See probe::nfs.proc.rename(3stap)
	       for details.

SEE ALSO

	  probe::nfs.proc.lookup(3stap),      probe::nfs.proc.read(3stap),	probe::nfs.proc.write(3stap),	  probe::nfs.proc.commit(3stap),
       probe::nfs.proc.read_setup(3stap),	       probe::nfs.proc.read_done(3stap),	       probe::nfs.proc.write_setup(3stap),
       probe::nfs.proc.write_done(3stap),  probe::nfs.proc.commit_setup(3stap),  probe::nfs.proc.commit_done(3stap),  probe::nfs.proc.open(3stap),
	probe::nfs.proc.release(3stap),  probe::nfs.proc.handle_exception(3stap),  probe::nfs.proc.create(3stap),  probe::nfs.proc.remove(3stap),
       probe::nfs.proc.rename(3stap),  stap(1), stapprobes(3stap)

IBM
									---						   tapset::nfs_proc(3stap)