#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 pid_t;

/* Variables and functions */
int /*<<< orphan*/ exit(int);
int fork();
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ puts(char *);
int /*<<< orphan*/ sleep(int);
pid_t fork_child(void) {
  int p = fork();
  if (p == -1) {
    perror("fork");
    exit(1);
  }
  if (p == 0) {
    puts("child: sleeping...");
    sleep(10);
    puts("child: exiting");
    exit(0);
  }
  return p;
}


x86 assembly (clang, -O0):
<fork_child>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    $0x0,%al
call   1070 <fork@plt>
mov    %eax,-0x4(%rbp)
cmpl   $0xffffffff,-0x4(%rbp)
jne    1182 <fork_child+0x32>
lea    0xe8d(%rip),%rdi
call   1040 <perror@plt>
mov    $0x1,%edi
call   1050 <exit@plt>
cmpl   $0x0,-0x4(%rbp)
jne    11b5 <fork_child+0x65>
lea    0xe72(%rip),%rdi
call   1030 <puts@plt>
mov    $0xa,%edi
call   1060 <sleep@plt>
lea    0xe6f(%rip),%rdi
call   1030 <puts@plt>
xor    %edi,%edi
call   1050 <exit@plt>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<fork_child>:
push   %rax
xor    %eax,%eax
call   1070 <fork@plt>
test   %eax,%eax
je     1163 <fork_child+0x13>
cmp    $0xffffffff,%eax
je     118c <fork_child+0x3c>
pop    %rcx
ret
lea    0xe9b(%rip),%rdi
call   1030 <puts@plt>
mov    $0xa,%edi
call   1060 <sleep@plt>
lea    0xe98(%rip),%rdi
call   1030 <puts@plt>
xor    %edi,%edi
call   1050 <exit@plt>
lea    0xe6d(%rip),%rdi
call   1040 <perror@plt>
mov    $0x1,%edi
call   1050 <exit@plt>

LLVM IR (-O0):
@.str = [5 x i8] c"fork\00"
@.str.1 = [19 x i8] c"child: sleeping...\00"
@.str.2 = [15 x i8] c"child: exiting\00"
define i32 @fork_child() {
%1 = alloca i32
%2 = call i32 (...) @fork()
store i32 %2, i32* %1
%3 = load i32, i32* %1
%4 = icmp eq i32 %3, -1
br i1 %4, label %5, label %8
5: ; preds = %0
%6 = call i32 @perror(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
%7 = call i32 @exit(i32 1)
unreachable
8: ; preds = %0
%9 = load i32, i32* %1
%10 = icmp eq i32 %9, 0
br i1 %10, label %11, label %16
11: ; preds = %8
%12 = call i32 @puts(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.1, i64 0, i64 0))
%13 = call i32 @sleep(i32 10)
%14 = call i32 @puts(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.2, i64 0, i64 0))
%15 = call i32 @exit(i32 0)
unreachable
16: ; preds = %8
%17 = load i32, i32* %1
ret i32 %17
}

LLVM IR (-O2):
@.str = [5 x i8] c"fork\00"
@.str.1 = [19 x i8] c"child: sleeping...\00"
@.str.2 = [15 x i8] c"child: exiting\00"
define i32 @fork_child() {
%1 = tail call i32 (...) @fork()
switch i32 %1, label %10 [
i32 -1, label %2
i32 0, label %5
]
2: ; preds = %0
%3 = tail call i32 @perror(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
%4 = tail call i32 @exit(i32 1)
unreachable
5: ; preds = %0
%6 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @.str.1, i64 0, i64 0))
%7 = tail call i32 @sleep(i32 10)
%8 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 x i8]* @.str.2, i64 0, i64 0))
%9 = tail call i32 @exit(i32 0)
unreachable
10: ; preds = %0
ret i32 %1
}