#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 scalar_t__ pid_t;

/* Variables and functions */
int WEXITSTATUS(int);
scalar_t__ WIFEXITED(int);
int /*<<< orphan*/ exit(int);
scalar_t__ fork();
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ sleep(int);
int /*<<< orphan*/ wait(int *);
int main(int argc, char *argv[]) {
  pid_t pid;
  pid = fork();
  if (pid < 0) {
    perror("fork");
  }
  if (pid == 0) {
    int i = 0;
    for (i = 0; i < 5; i++) {
      printf("in son process\n");
      sleep(1);
    }
    exit(123);
  } else {
    int status;
    wait(&status);
    if (WIFEXITED(status)) {
      printf("son ret val is %d\n", WEXITSTATUS(status));
    }
    printf("in father process\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)
mov    $0x0,%al
call   10a0 <fork@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jge    11b8 <main+0x38>
lea    0xe4d(%rip),%rdi
call   1050 <perror@plt>
cmpq   $0x0,-0x18(%rbp)
jne    120b <main+0x8b>
movl   $0x0,-0x1c(%rbp)
movl   $0x0,-0x1c(%rbp)
cmpl   $0x5,-0x1c(%rbp)
jge    1201 <main+0x81>
lea    0xe23(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    $0x1,%edi
call   1080 <sleep@plt>
mov    -0x1c(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x1c(%rbp)
jmp    11d1 <main+0x51>
mov    $0x7b,%edi
call   1070 <exit@plt>
lea    -0x20(%rbp),%rdi
call   1090 <wait@plt>
mov    -0x20(%rbp),%edi
call   1060 <WIFEXITED@plt>
cmp    $0x0,%rax
je     123e <main+0xbe>
mov    -0x20(%rbp),%edi
call   1040 <WEXITSTATUS@plt>
mov    %eax,%esi
lea    0xdde(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xde3(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
xor    %eax,%eax
call   10b0 <fork@plt>
test   %rax,%rax
js     11e8 <main+0x58>
je     11f6 <main+0x66>
lea    0xc(%rsp),%rdi
call   10a0 <wait@plt>
mov    0xc(%rsp),%edi
call   1070 <WIFEXITED@plt>
test   %rax,%rax
je     11d4 <main+0x44>
mov    0xc(%rsp),%edi
call   1050 <WEXITSTATUS@plt>
lea    0xe3a(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xe3d(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret
lea    0xe11(%rip),%rdi
call   1060 <perror@plt>
jmp    11a3 <main+0x13>
lea    0xe2d(%rip),%rbx
mov    %rbx,%rdi
call   1030 <puts@plt>
mov    $0x1,%edi
call   1090 <sleep@plt>
mov    %rbx,%rdi
call   1030 <puts@plt>
mov    $0x1,%edi
call   1090 <sleep@plt>
mov    %rbx,%rdi
call   1030 <puts@plt>
mov    $0x1,%edi
call   1090 <sleep@plt>
mov    %rbx,%rdi
call   1030 <puts@plt>
mov    $0x1,%edi
call   1090 <sleep@plt>
mov    %rbx,%rdi
call   1030 <puts@plt>
mov    $0x1,%edi
call   1090 <sleep@plt>
mov    $0x7b,%edi
call   1080 <exit@plt>

LLVM IR (-O0):
@.str = [5 x i8] c"fork\00"
@.str.1 = [16 x i8] c"in son process\0A\00"
@.str.2 = [19 x i8] c"son ret val is %d\0A\00"
@.str.3 = [19 x i8] c"in father process\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i64
%7 = alloca i32
%8 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%9 = call i64 (...) @fork()
store i64 %9, i64* %6
%10 = load i64, i64* %6
%11 = icmp slt i64 %10, 0
br i1 %11, label %12, label %14
12: ; preds = %2
%13 = call i32 @perror(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
br label %14
14: ; preds = %12, %2
%15 = load i64, i64* %6
%16 = icmp eq i64 %15, 0
br i1 %16, label %17, label %29
17: ; preds = %14
store i32 0, i32* %7
store i32 0, i32* %7
br label %18
18: ; preds = %24, %17
%19 = load i32, i32* %7
%20 = icmp slt i32 %19, 5
br i1 %20, label %21, label %27
21: ; preds = %18
%22 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.1, i64 0, i64 0))
%23 = call i32 @sleep(i32 1)
br label %24
24: ; preds = %21
%25 = load i32, i32* %7
%26 = add nsw i32 %25, 1
store i32 %26, i32* %7
br label %18
27: ; preds = %18
%28 = call i32 @exit(i32 123)
unreachable
29: ; preds = %14
%30 = call i32 @wait(i32* %8)
%31 = load i32, i32* %8
%32 = call i64 @WIFEXITED(i32 %31)
%33 = icmp ne i64 %32, 0
br i1 %33, label %34, label %38
34: ; preds = %29
%35 = load i32, i32* %8
%36 = call i32 @WEXITSTATUS(i32 %35)
%37 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0), i32 %36)
br label %38
38: ; preds = %34, %29
%39 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.3, i64 0, i64 0))
br label %40
40: ; preds = %38
ret i32 0
}

LLVM IR (-O2):
@.str = [5 x i8] c"fork\00"
@.str.2 = [19 x i8] c"son ret val is %d\0A\00"
@str = [18 x i8] c"in father process\00"
@str.4 = [15 x i8] c"in son process\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca i32
%4 = tail call i64 (...) @fork()
%5 = icmp slt i64 %4, 0
br i1 %5, label %6, label %8
6: ; preds = %2
%7 = tail call i32 @perror(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
br label %22
8: ; preds = %2
%9 = icmp eq i64 %4, 0
br i1 %9, label %10, label %22
10: ; preds = %8
%11 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 x i8]* @str.4, i64 0, i64 0))
%12 = tail call i32 @sleep(i32 1)
%13 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 x i8]* @str.4, i64 0, i64 0))
%14 = tail call i32 @sleep(i32 1)
%15 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 x i8]* @str.4, i64 0, i64 0))
%16 = tail call i32 @sleep(i32 1)
%17 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 x i8]* @str.4, i64 0, i64 0))
%18 = tail call i32 @sleep(i32 1)
%19 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 x i8]* @str.4, i64 0, i64 0))
%20 = tail call i32 @sleep(i32 1)
%21 = tail call i32 @exit(i32 123)
unreachable
22: ; preds = %6, %8
%23 = bitcast i32* %3 to i8*
%24 = call i32 @wait(i32* %3)
%25 = load i32, i32* %3
%26 = call i64 @WIFEXITED(i32 %25)
%27 = icmp eq i64 %26, 0
br i1 %27, label %32, label %28
28: ; preds = %22
%29 = load i32, i32* %3
%30 = call i32 @WEXITSTATUS(i32 %29)
%31 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0), i32 %30)
br label %32
32: ; preds = %28, %22
%33 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @str, i64 0, i64 0))
ret i32 0
}