#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int /*<<< orphan*/ printf(char *);
int /*<<< orphan*/ system(char *);
int use_clone() {
  printf("Welcome to your new network namespace!\n");
  printf("Here's the new output of 'ip link show'\n");
  system("/sbin/ip link show");
  printf("\n\n");
  system("/bin/bash");
  printf("Back to the old namespace.\n");
}


x86 assembly (clang, -O0):
<use_clone>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
lea    0xed1(%rip),%rdi
call   1040 <printf@plt>
lea    0xeed(%rip),%rdi
call   1040 <printf@plt>
lea    0xf0a(%rip),%rdi
call   1030 <system@plt>
lea    0xf11(%rip),%rdi
call   1040 <printf@plt>
lea    0xf08(%rip),%rdi
call   1030 <system@plt>
lea    0xf06(%rip),%rdi
call   1040 <printf@plt>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<use_clone>:
push   %rax
lea    0xef5(%rip),%rdi
call   1030 <puts@plt>
lea    0xf10(%rip),%rdi
call   1030 <puts@plt>
lea    0xec0(%rip),%rdi
call   1040 <system@plt>
lea    0xf20(%rip),%rdi
call   1030 <puts@plt>
lea    0xebb(%rip),%rdi
call   1040 <system@plt>
lea    0xf0a(%rip),%rdi
pop    %rax
jmp    1030 <puts@plt>

LLVM IR (-O0):
@.str = [40 x i8] c"Welcome to your new network namespace!\0A\00"
@.str.1 = [41 x i8] c"Here's the new output of 'ip link show'\0A\00"
@.str.2 = [19 x i8] c"/sbin/ip link show\00"
@.str.3 = [3 x i8] c"\0A\0A\00"
@.str.4 = [10 x i8] c"/bin/bash\00"
@.str.5 = [28 x i8] c"Back to the old namespace.\0A\00"
define i32 @use_clone() {
%1 = alloca i32
%2 = call i32 @printf(i8* getelementptr inbounds ([40 x i8], [40 x i8]* @.str, i64 0, i64 0))
%3 = call i32 @printf(i8* getelementptr inbounds ([41 x i8], [41 x i8]* @.str.1, i64 0, i64 0))
%4 = call i32 @system(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0))
%5 = call i32 @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0))
%6 = call i32 @system(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.4, i64 0, i64 0))
%7 = call i32 @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.5, i64 0, i64 0))
%8 = load i32, i32* %1
ret i32 %8
}

LLVM IR (-O2):
@.str.2 = [19 x i8] c"/sbin/ip link show\00"
@.str.4 = [10 x i8] c"/bin/bash\00"
@str = [39 x i8] c"Welcome to your new network namespace!\00"
@str.6 = [40 x i8] c"Here's the new output of 'ip link show'\00"
@str.7 = [2 x i8] c"\0A\00"
@str.8 = [27 x i8] c"Back to the old namespace.\00"
define i32 @use_clone() {
%1 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([39 x i8], [39 x i8]* @str, i64 0, i64 0))
%2 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([40 x i8], [40 x i8]* @str.6, i64 0, i64 0))
%3 = tail call i32 @system(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0))
%4 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([2 x i8], [2 x i8]* @str.7, i64 0, i64 0))
%5 = tail call i32 @system(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.4, i64 0, i64 0))
%6 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([27 x i8], [27 x i8]* @str.8, i64 0, i64 0))
ret i32 undef
}