Agora, vá para EXIT_SUCCESS depois que o modo estrito seccomp for definido. É a prática correta, chamarsyscall(SYS_exit, EXIT_SUCCESS); no final do main?

#include <stdlib.h>
#include <unistd.h> 
#include <sys/prctl.h>     
#include <linux/seccomp.h> 
#include <sys/syscall.h>

int main(int argc, char **argv) {
  prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT);

  //return EXIT_SUCCESS; // does not work
  //_exit(EXIT_SUCCESS); // does not work
  // syscall(__NR_exit, EXIT_SUCCESS); // (EDIT) This works! Is this the ultimate answer and the right way to exit success from seccomp-ed programs?
  syscall(SYS_exit, EXIT_SUCCESS); // (EDIT) works; SYS_exit equals __NR_exit
}

// gcc seccomp.c -o seccomp && ./seccomp; echo "${?}" # I want 0