C - fork and pin to cpu

fork-pin-cpu.md

Template: Recursive Calls if fork returns positive value

#include <sched.h>
#define errExit(msg)    do { perror(msg); exit(EXIT_FAILURE); \
                        } while (0)
                        
cpu_set_t set;
CPU_ZERO(&set);

int fork_func(<args>)
{
  uint32_t pid = 0;
  ...
  switch(fork())
  {
      case -1:
          errExit("fork");

      case 0:
          CPU_SET(<cpu#>, &set);

          pid = getpid();

          if (sched_setaffinity(pid, sizeof(set), &set) == -1)
              errExit("sched_setaffinity");

          if (do_func(<args>) == -1)
              return -1;
          break;

      default:
          if (fork_func(<args>) == -1)
              return -1;
          break;
  }
  ...
}