#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);
int fd_set_nonblock(int fd) {
  int r;
  int flags = fcntl(fd, F_GETFL, 0);
  if (flags == -1) {
    return -1;
  }
  r = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
  if (r == -1) {
    return -2;
  }
  return 0;
}


x86 assembly (clang, -O0):
<fd_set_nonblock>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x8(%rbp)
mov    -0x8(%rbp),%edi
mov    0x2eab(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1030 <fcntl@plt>
mov    %eax,-0x10(%rbp)
cmpl   $0xffffffff,-0x10(%rbp)
jne    1147 <fd_set_nonblock+0x37>
movl   $0xffffffff,-0x4(%rbp)
jmp    1184 <fd_set_nonblock+0x74>
mov    -0x8(%rbp),%edi
mov    0x2e87(%rip),%rax
mov    (%rax),%esi
mov    -0x10(%rbp),%edx
mov    0x2e8b(%rip),%rax
or     (%rax),%edx
call   1030 <fcntl@plt>
mov    %eax,-0xc(%rbp)
cmpl   $0xffffffff,-0xc(%rbp)
jne    117d <fd_set_nonblock+0x6d>
movl   $0xfffffffe,-0x4(%rbp)
jmp    1184 <fd_set_nonblock+0x74>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<fd_set_nonblock>:
push   %rbx
mov    %edi,%ebx
mov    0x2eb6(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1030 <fcntl@plt>
cmp    $0xffffffff,%eax
je     1153 <fd_set_nonblock+0x43>
mov    0x2ea9(%rip),%rcx
mov    (%rcx),%esi
mov    0x2eb0(%rip),%rcx
or     (%rcx),%eax
mov    %ebx,%edi
mov    %eax,%edx
call   1030 <fcntl@plt>
xor    %ecx,%ecx
cmp    $0xffffffff,%eax
setne  %cl
lea    (%rcx,%rcx,1),%eax
add    $0xfffffffe,%eax
pop    %rbx
ret
mov    $0xffffffff,%eax
pop    %rbx
ret

LLVM IR (-O0):
@F_GETFL = global i32 0
@F_SETFL = global i32 0
@O_NONBLOCK = global i32 0
define i32 @fd_set_nonblock(i32 %0) {
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
store i32 %0, i32* %3
%6 = load i32, i32* %3
%7 = load i32, i32* @F_GETFL
%8 = call i32 @fcntl(i32 %6, i32 %7, i32 0)
store i32 %8, i32* %5
%9 = load i32, i32* %5
%10 = icmp eq i32 %9, -1
br i1 %10, label %11, label %12
11: ; preds = %1
store i32 -1, i32* %2
br label %23
12: ; preds = %1
%13 = load i32, i32* %3
%14 = load i32, i32* @F_SETFL
%15 = load i32, i32* %5
%16 = load i32, i32* @O_NONBLOCK
%17 = or i32 %15, %16
%18 = call i32 @fcntl(i32 %13, i32 %14, i32 %17)
store i32 %18, i32* %4
%19 = load i32, i32* %4
%20 = icmp eq i32 %19, -1
br i1 %20, label %21, label %22
21: ; preds = %12
store i32 -2, i32* %2
br label %23
22: ; preds = %12
store i32 0, i32* %2
br label %23
23: ; preds = %22, %21, %11
%24 = load i32, i32* %2
ret i32 %24
}

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