#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 /*<<< orphan*/ EXIT_FAILURE;
int /*<<< orphan*/ EXIT_SUCCESS;
scalar_t__ chdir(char *);
int /*<<< orphan*/ exit(int /*<<< orphan*/);
scalar_t__ fork();
int /*<<< orphan*/ freopen(char *, char *, int /*<<< orphan*/);
int getppid();
scalar_t__ setsid();
int /*<<< orphan*/ stderr;
int /*<<< orphan*/ stdin;
int /*<<< orphan*/ stdout;
int /*<<< orphan*/ umask(int /*<<< orphan*/);
void daemonize(void) {
  pid_t pid, sid;
  if (getppid() == 1)
    return;
  pid = fork();
  if (pid < 0) {
    exit(EXIT_FAILURE);
  }
  if (pid > 0) {
    exit(EXIT_SUCCESS);
  }
  umask(0);
  sid = setsid();
  if (sid < 0) {
    exit(EXIT_FAILURE);
  }
  if ((chdir("/")) < 0) {
    exit(EXIT_FAILURE);
  }
  freopen("/dev/null", "r", stdin);
  freopen("/dev/null", "w", stdout);
  freopen("/dev/null", "w", stderr);
}


x86 assembly (clang, -O0):
<daemonize>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    $0x0,%al
call   1070 <getppid@plt>
cmp    $0x1,%eax
jne    118d <daemonize+0x1d>
jmp    126d <daemonize+0xfd>
mov    $0x0,%al
call   1090 <fork@plt>
mov    %rax,-0x8(%rbp)
cmpq   $0x0,-0x8(%rbp)
jge    11b1 <daemonize+0x41>
mov    0x2e26(%rip),%rax
mov    (%rax),%edi
call   1080 <exit@plt>
cmpq   $0x0,-0x8(%rbp)
jle    11ca <daemonize+0x5a>
mov    0x2dfd(%rip),%rax
mov    (%rax),%edi
call   1080 <exit@plt>
xor    %edi,%edi
call   1060 <umask@plt>
mov    $0x0,%al
call   1050 <setsid@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jge    11f5 <daemonize+0x85>
mov    0x2de2(%rip),%rax
mov    (%rax),%edi
call   1080 <exit@plt>
lea    0xe04(%rip),%rdi
call   1030 <chdir@plt>
cmp    $0x0,%rax
jge    1219 <daemonize+0xa9>
mov    0x2dbe(%rip),%rax
mov    (%rax),%edi
call   1080 <exit@plt>
mov    0x2dc8(%rip),%rax
mov    (%rax),%edx
lea    0xdd9(%rip),%rdi
lea    0xddc(%rip),%rsi
call   1040 <freopen@plt>
mov    0x2d8c(%rip),%rax
mov    (%rax),%edx
lea    0xdbd(%rip),%rdi
lea    0xdc2(%rip),%rsi
call   1040 <freopen@plt>
mov    0x2d80(%rip),%rax
mov    (%rax),%edx
lea    0xda1(%rip),%rdi
lea    0xda6(%rip),%rsi
call   1040 <freopen@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<daemonize>:
push   %r14
push   %rbx
push   %rax
xor    %eax,%eax
call   1070 <getppid@plt>
cmp    $0x1,%eax
jne    1188 <daemonize+0x18>
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret
xor    %eax,%eax
call   1090 <fork@plt>
test   %rax,%rax
js     1213 <daemonize+0xa3>
jne    1221 <daemonize+0xb1>
xor    %edi,%edi
call   1060 <umask@plt>
xor    %eax,%eax
call   1050 <setsid@plt>
test   %rax,%rax
js     1213 <daemonize+0xa3>
lea    0xe4c(%rip),%rdi
call   1030 <chdir@plt>
test   %rax,%rax
js     1213 <daemonize+0xa3>
mov    0x2e23(%rip),%rax
mov    (%rax),%edx
lea    0xe34(%rip),%rbx
lea    0xe37(%rip),%rsi
mov    %rbx,%rdi
call   1040 <freopen@plt>
mov    0x2de4(%rip),%rax
mov    (%rax),%edx
lea    0xe21(%rip),%r14
mov    %rbx,%rdi
mov    %r14,%rsi
call   1040 <freopen@plt>
mov    0x2dd9(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
mov    %r14,%rsi
add    $0x8,%rsp
pop    %rbx
pop    %r14
jmp    1040 <freopen@plt>
mov    0x2db6(%rip),%rax
mov    (%rax),%edi
call   1080 <exit@plt>
mov    0x2d98(%rip),%rax
mov    (%rax),%edi
call   1080 <exit@plt>

LLVM IR (-O0):
@EXIT_FAILURE = global i32 0
@EXIT_SUCCESS = global i32 0
@.str = [2 x i8] c"/\00"
@.str.1 = [10 x i8] c"/dev/null\00"
@.str.2 = [2 x i8] c"r\00"
@stdin = global i32 0
@.str.3 = [2 x i8] c"w\00"
@stdout = global i32 0
@stderr = global i32 0
define void @daemonize() {
%1 = alloca i64
%2 = alloca i64
%3 = call i32 (...) @getppid()
%4 = icmp eq i32 %3, 1
br i1 %4, label %5, label %6
5: ; preds = %0
br label %40
6: ; preds = %0
%7 = call i64 (...) @fork()
store i64 %7, i64* %1
%8 = load i64, i64* %1
%9 = icmp slt i64 %8, 0
br i1 %9, label %10, label %13
10: ; preds = %6
%11 = load i32, i32* @EXIT_FAILURE
%12 = call i32 @exit(i32 %11)
unreachable
13: ; preds = %6
%14 = load i64, i64* %1
%15 = icmp sgt i64 %14, 0
br i1 %15, label %16, label %19
16: ; preds = %13
%17 = load i32, i32* @EXIT_SUCCESS
%18 = call i32 @exit(i32 %17)
unreachable
19: ; preds = %13
%20 = call i32 @umask(i32 0)
%21 = call i64 (...) @setsid()
store i64 %21, i64* %2
%22 = load i64, i64* %2
%23 = icmp slt i64 %22, 0
br i1 %23, label %24, label %27
24: ; preds = %19
%25 = load i32, i32* @EXIT_FAILURE
%26 = call i32 @exit(i32 %25)
unreachable
27: ; preds = %19
%28 = call i64 @chdir(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%29 = icmp slt i64 %28, 0
br i1 %29, label %30, label %33
30: ; preds = %27
%31 = load i32, i32* @EXIT_FAILURE
%32 = call i32 @exit(i32 %31)
unreachable
33: ; preds = %27
%34 = load i32, i32* @stdin
%35 = call i32 @freopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0), i32 %34)
%36 = load i32, i32* @stdout
%37 = call i32 @freopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0), i32 %36)
%38 = load i32, i32* @stderr
%39 = call i32 @freopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0), i32 %38)
br label %40
40: ; preds = %33, %5
ret void
}

LLVM IR (-O2):
@EXIT_FAILURE = global i32 0
@EXIT_SUCCESS = global i32 0
@.str = [2 x i8] c"/\00"
@.str.1 = [10 x i8] c"/dev/null\00"
@.str.2 = [2 x i8] c"r\00"
@stdin = global i32 0
@.str.3 = [2 x i8] c"w\00"
@stdout = global i32 0
@stderr = global i32 0
define void @daemonize() {
%1 = tail call i32 (...) @getppid()
%2 = icmp eq i32 %1, 1
br i1 %2, label %34, label %3
3: ; preds = %0
%4 = tail call i64 (...) @fork()
%5 = icmp slt i64 %4, 0
br i1 %5, label %6, label %9
6: ; preds = %3
%7 = load i32, i32* @EXIT_FAILURE
%8 = tail call i32 @exit(i32 %7)
unreachable
9: ; preds = %3
%10 = icmp eq i64 %4, 0
br i1 %10, label %14, label %11
11: ; preds = %9
%12 = load i32, i32* @EXIT_SUCCESS
%13 = tail call i32 @exit(i32 %12)
unreachable
14: ; preds = %9
%15 = tail call i32 @umask(i32 0)
%16 = tail call i64 (...) @setsid()
%17 = icmp slt i64 %16, 0
br i1 %17, label %18, label %21
18: ; preds = %14
%19 = load i32, i32* @EXIT_FAILURE
%20 = tail call i32 @exit(i32 %19)
unreachable
21: ; preds = %14
%22 = tail call i64 @chdir(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%23 = icmp slt i64 %22, 0
br i1 %23, label %24, label %27
24: ; preds = %21
%25 = load i32, i32* @EXIT_FAILURE
%26 = tail call i32 @exit(i32 %25)
unreachable
27: ; preds = %21
%28 = load i32, i32* @stdin
%29 = tail call i32 @freopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0), i32 %28)
%30 = load i32, i32* @stdout
%31 = tail call i32 @freopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0), i32 %30)
%32 = load i32, i32* @stderr
%33 = tail call i32 @freopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0), i32 %32)
br label %34
34: ; preds = %0, %27
ret void
}