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..
