Executed shellcode terminates main program - c

Question

I am trying to execute shellcode in a memory region. While it works so far, I am confronted with another problem right now: The main-c-program exits after I called the shellcode-program. Is there a (simple) way around this other than working with threads?
I think that this has something to do with the mov rax, 60 and the following syscall, exiting the program. Right?
Main-C-Code
#include <string.h>
#include <sys/mman.h>
const char shellcode[] = "\xeb\x1e\xb8\x01\x00\x00\x00\xbf\x01\x00\x00\x00\x5e\xba\x0d\x00\x00\x00\x0f\x05\xb8\x3c\x00\x00\x00\xbf\x00\x00\x00\x00\x0f\x05\xe8\xdd\xff\xff\xff\x48\x65\x6c\x6c\x6f\x2c\x20\x57\x6f\x72\x6c\x64\x21";
// Error checking omitted for expository purposes
int main(int argc, char **argv)
{
// Allocate some read-write memory
void *mem = mmap(0, sizeof(shellcode), PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
// Copy the shellcode into the new memory
memcpy(mem, shellcode, sizeof(shellcode));
// Make the memory read-execute
mprotect(mem, sizeof(shellcode), PROT_READ|PROT_WRITE|PROT_EXEC);
// Call the shellcode
void (*func)();
func = (void (*)())mem;
(void)(*func)();
// This text will never appear
printf("This text never appears");
// Now, if we managed to return here, it would be prudent to clean up the memory:
// (I think that this line of code is also never reached)
munmap(mem, sizeof(shellcode));
return 0;
}
Basis of the Shellcode (assembler (Intel))
global _start
_start:
jmp message
code:
mov rax, 1
mov rdi, 1
pop rsi
mov rdx, 13
syscall
mov rax, 60
mov rdi, 0
syscall
message:
call code
db "Hello, World!"

Answer 1

imo the simplest way would be to make a binary file, then exec() that. and if you need output from that then setup pipes.

Answer 2

I actually found it out by myself. If anyone is interested, the simple solution was to alter the assembler-code as follows:
global _start
_start:
jmp message
code:
mov rax, 1
mov rdi, 1
pop rsi
mov rdx, 13
syscall
ret # Instead of "mov.., mov..., syscall"
message:
call code
db "Hello, World!"