Program which creates a half-open socketpair, then sits around endlessly, doing nothing

socketpair.c

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

int main(int argc, char** argv) {
  int sp[2];
  
  if (socketpair(PF_UNIX, SOCK_STREAM, 0, sp) < 0) {
    perror("Failed to get socketpair");
  }
  
  close(sp[1]);
  
  for (;;) { sleep(1000); }
}