Amal Amal - 1 month ago 6
C Question

Getting unwanted characters at the end of a message

The following c program is used to send a message from parent process to the child process(created using fork()) via a pipe and is run on the linux terminal!

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>

int main(int argc,char *arg[]){
pid_t child;
int pipefd[2];
int ret;
char message[20];
ret =pipe(pipefd);


if((child=fork())==0){
printf("The child process \n");
close(pipefd[0]);
write(pipefd[1],"Hello from parent",17);

}

else{
close(pipefd[1]);
read(pipefd[0],message,17);
printf("Message from parent %s\n",message);
}
return 0;
}


The above code prints the message "Hello from parent" but at the end of parent part an @ sign is printed! what is the reason and how can i rectify it?

Answer

Send also null character that is at the end of the string. Same for reading.

write(pipefd[1],"Hello from parent",18);
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