Transfer switch cases value to another process with named pipe - c

Question

In my program, I want to send my switch case value to another process using named pipe "pipeselect". I write the number in the pipe and read the number in another program. But When I run the problem, it cannot show anything when I enter a case value. How can I do this?
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
int main()
{
char pipeselect[] = "/tmp/pipeselect";
char bufs[2];
int fds;
int select1;
/* Pipe Creation */
if (access(pipeselect, F_OK) == -1)
{
fds = mkfifo(pipeselect, 0700);
if (fds != 0)
{
printf("Pipe creation error\n");
exit(1);
}
}
printf("1. Option 1\n");
printf("2. Option 2\n");
printf("Please select an option: ");
scanf("%d", &select1);
int i = select1;
switch (i)
{
case 1:
if ((fds = open(pipeselect, O_WRONLY)) < 0)
{
printf("Pipe open error\n");
exit(1);
}
write(fds, bufs, i);
close(fds);
printf("Option 1 is selected\n");
break;
case 2:
if ((fds = open(pipeselect, O_WRONLY)) < 0)
{
printf("Pipe open error\n");
exit(1);
}
write(fds, bufs, i);
close(fds);
printf("Option 2 is selected\n");
break;
default:
printf("Wrong Input!\n");
break;
unlink(pipeselect);
exit(0);
}
}

Answer 1

You probably need to use write like this:
bufs[0] = i; // put value entered by user into buffer
write(fds, bufs, 1); // write 1 byte from the buffer
BTW you could narrow down your code like this:
...
scanf("%d", &select1);
if (select1 == 1 || select1 == 2)
{
if ((fds = open(pipeselect, O_WRONLY)) < 0) {
printf("Pipe open error\n");
exit(1);
}
bufs[0] = select1; // put value entered by user into buffer
write(fds, bufs, 1); // write 1 byte from the buffer
close(fds);
printf("Option %d is selected\n", select1);
}
else {
printf("Wrong Input!\n");
}
unlink(pipeselect);
exit(0);