#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*/ F_GETFL;
int /*<<< orphan*/ F_SETFL;
int O_NONBLOCK;
int fcntl(int, int /*<<< orphan*/, ...);
int spy_set_blocking(int fd, int block) {
  int flags;
  if ((flags = fcntl(fd, F_GETFL)) == -1) {
    return -1;
  }
  if (block) {
    flags &= ~O_NONBLOCK;
  } else {
    flags |= O_NONBLOCK;
  }
  if (fcntl(fd, F_SETFL, flags) == -1) {
    return -1;
  }
  return 0;
}


x86 assembly (clang, -O0):
<spy_set_blocking>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
mov    -0x8(%rbp),%edi
mov    0x2ea8(%rip),%rax
mov    (%rax),%esi
mov    $0x0,%al
call   1030 <fcntl@plt>
mov    %eax,-0x10(%rbp)
cmp    $0xffffffff,%eax
jne    1149 <spy_set_blocking+0x39>
movl   $0xffffffff,-0x4(%rbp)
jmp    11ab <spy_set_blocking+0x9b>
cmpl   $0x0,-0xc(%rbp)
je     116a <spy_set_blocking+0x5a>
mov    0x2e8e(%rip),%rax
mov    (%rax),%eax
xor    $0xffffffff,%eax
and    -0x10(%rbp),%eax
mov    %eax,-0x10(%rbp)
jmp    1179 <spy_set_blocking+0x69>
mov    0x2e77(%rip),%rax
mov    (%rax),%eax
or     -0x10(%rbp),%eax
mov    %eax,-0x10(%rbp)
mov    -0x8(%rbp),%edi
mov    0x2e55(%rip),%rax
mov    (%rax),%esi
mov    -0x10(%rbp),%edx
mov    $0x0,%al
call   1030 <fcntl@plt>
cmp    $0xffffffff,%eax
jne    11a4 <spy_set_blocking+0x94>
movl   $0xffffffff,-0x4(%rbp)
jmp    11ab <spy_set_blocking+0x9b>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<spy_set_blocking>:
push   %rbp
push   %rbx
push   %rax
mov    %esi,%ebp
mov    %edi,%ebx
mov    0x2eb2(%rip),%rax
mov    (%rax),%esi
xor    %eax,%eax
call   1030 <fcntl@plt>
cmp    $0xffffffff,%eax
je     1162 <spy_set_blocking+0x52>
mov    0x2eb5(%rip),%rcx
mov    (%rcx),%edx
mov    %edx,%ecx
not    %ecx
and    %eax,%ecx
or     %eax,%edx
test   %ebp,%ebp
cmovne %ecx,%edx
mov    0x2e8f(%rip),%rax
mov    (%rax),%esi
mov    %ebx,%edi
xor    %eax,%eax
call   1030 <fcntl@plt>
mov    %eax,%ecx
xor    %eax,%eax
cmp    $0xffffffff,%ecx
sete   %al
neg    %eax
jmp    1167 <spy_set_blocking+0x57>
mov    $0xffffffff,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@F_GETFL = global i32 0
@O_NONBLOCK = global i32 0
@F_SETFL = global i32 0
define i32 @spy_set_blocking(i32 %0, i32 %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
%6 = alloca i32
store i32 %0, i32* %4
store i32 %1, i32* %5
%7 = load i32, i32* %4
%8 = load i32, i32* @F_GETFL
%9 = call i32 (i32, i32, ...) @fcntl(i32 %7, i32 %8)
store i32 %9, i32* %6
%10 = icmp eq i32 %9, -1
br i1 %10, label %11, label %12
11: ; preds = %2
store i32 -1, i32* %3
br label %32
12: ; preds = %2
%13 = load i32, i32* %5
%14 = icmp ne i32 %13, 0
br i1 %14, label %15, label %20
15: ; preds = %12
%16 = load i32, i32* @O_NONBLOCK
%17 = xor i32 %16, -1
%18 = load i32, i32* %6
%19 = and i32 %18, %17
store i32 %19, i32* %6
br label %24
20: ; preds = %12
%21 = load i32, i32* @O_NONBLOCK
%22 = load i32, i32* %6
%23 = or i32 %22, %21
store i32 %23, i32* %6
br label %24
24: ; preds = %20, %15
%25 = load i32, i32* %4
%26 = load i32, i32* @F_SETFL
%27 = load i32, i32* %6
%28 = call i32 (i32, i32, ...) @fcntl(i32 %25, i32 %26, i32 %27)
%29 = icmp eq i32 %28, -1
br i1 %29, label %30, label %31
30: ; preds = %24
store i32 -1, i32* %3
br label %32
31: ; preds = %24
store i32 0, i32* %3
br label %32
32: ; preds = %31, %30, %11
%33 = load i32, i32* %3
ret i32 %33
}

LLVM IR (-O2):
@F_GETFL = global i32 0
@O_NONBLOCK = global i32 0
@F_SETFL = global i32 0
define i32 @spy_set_blocking(i32 %0, i32 %1) {
%3 = load i32, i32* @F_GETFL
%4 = tail call i32 (i32, i32, ...) @fcntl(i32 %0, i32 %3)
%5 = icmp eq i32 %4, -1
br i1 %5, label %17, label %6
6: ; preds = %2
%7 = icmp eq i32 %1, 0
%8 = load i32, i32* @O_NONBLOCK
%9 = xor i32 %8, -1
%10 = and i32 %4, %9
%11 = or i32 %8, %4
%12 = select i1 %7, i32 %11, i32 %10
%13 = load i32, i32* @F_SETFL
%14 = tail call i32 (i32, i32, ...) @fcntl(i32 %0, i32 %13, i32 %12)
%15 = icmp eq i32 %14, -1
%16 = sext i1 %15 to i32
br label %17
17: ; preds = %6, %2
%18 = phi i32 [ -1, %2 ], [ %16, %6 ]
ret i32 %18
}