#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 */
typedef int /*<<< orphan*/ pid_t;

/* Variables and functions */
int /*<<< orphan*/ atoi(char *);
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ sleep(int);
int /*<<< orphan*/ waitpid(int /*<<< orphan*/, int *, int /*<<< orphan*/);
int main(int argc, char **argv) {
  pid_t pid;
  int status;
  if (argc != 2) {
    printf("Usage:%s pid \n", argv[0]);
    exit(-1);
  }
  pid = atoi(argv[1]);
  while (1) {
    waitpid(pid, &status, 0);
    sleep(5);
  }
  printf("exiting.\n");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
je     118f <main+0x3f>
mov    -0x10(%rbp),%rax
mov    (%rax),%rsi
lea    0xe82(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    $0xffffffff,%edi
call   1060 <exit@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1050 <atoi@plt>
mov    %eax,-0x14(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x18(%rbp),%rsi
xor    %edx,%edx
call   1040 <waitpid@plt>
mov    $0x5,%edi
call   1070 <sleep@plt>
jmp    119f <main+0x4f>

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
cmp    $0x2,%edi
jne    1188 <main+0x38>
mov    0x8(%rsi),%rdi
call   1050 <atoi@plt>
mov    %eax,%ebx
lea    0x4(%rsp),%r14
nopl   0x0(%rax)
mov    %ebx,%edi
mov    %r14,%rsi
xor    %edx,%edx
call   1040 <waitpid@plt>
mov    $0x5,%edi
call   1070 <sleep@plt>
jmp    1170 <main+0x20>
mov    (%rsi),%rsi
lea    0xe6e(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    $0xffffffff,%edi
call   1060 <exit@plt>

LLVM IR (-O0):
@.str = [15 x i8] c"Usage:%s pid \0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = load i32, i32* %4
%9 = icmp ne i32 %8, 2
br i1 %9, label %10, label %16
10: ; preds = %2
%11 = load i8**, i8*** %5
%12 = getelementptr inbounds i8*, i8** %11, i64 0
%13 = load i8*, i8** %12
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0), i8* %13)
%15 = call i32 @exit(i32 -1)
unreachable
16: ; preds = %2
%17 = load i8**, i8*** %5
%18 = getelementptr inbounds i8*, i8** %17, i64 1
%19 = load i8*, i8** %18
%20 = call i32 @atoi(i8* %19)
store i32 %20, i32* %6
br label %21
21: ; preds = %16, %21
%22 = load i32, i32* %6
%23 = call i32 @waitpid(i32 %22, i32* %7, i32 0)
%24 = call i32 @sleep(i32 5)
br label %21
}

LLVM IR (-O2):
@.str = [15 x i8] c"Usage:%s pid \0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = alloca i32
%4 = bitcast i32* %3 to i8*
%5 = icmp eq i32 %0, 2
br i1 %5, label %10, label %6
6: ; preds = %2
%7 = load i8*, i8** %1
%8 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0), i8* %7)
%9 = tail call i32 @exit(i32 -1)
unreachable
10: ; preds = %2
%11 = getelementptr inbounds i8*, i8** %1, i64 1
%12 = load i8*, i8** %11
%13 = tail call i32 @atoi(i8* %12)
br label %14
14: ; preds = %14, %10
%15 = call i32 @waitpid(i32 %13, i32* %3, i32 0)
%16 = call i32 @sleep(i32 5)
br label %14
}