#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 /*<<< orphan*/ warn(char *);
int fdnb(int fd) {
  int flags;
  flags = fcntl(fd, F_GETFL, 0);
  if (flags == -1) {
    warn("fcntl getfl failed");
    return -1;
  }
  flags |= O_NONBLOCK;
  if (fcntl(fd, F_SETFL, flags) == -1) {
    warn("fcntl setfl failed");
    return -1;
  }
  return 0;
}


x86 assembly (clang, -O0):
<fdnb>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x8(%rbp)
mov    -0x8(%rbp),%edi
mov    0x2e9b(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1040 <fcntl@plt>
mov    %eax,-0xc(%rbp)
cmpl   $0xffffffff,-0xc(%rbp)
jne    1163 <fdnb+0x43>
lea    0xeae(%rip),%rdi
call   1030 <warn@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    11ae <fdnb+0x8e>
mov    0x2e7e(%rip),%rax
mov    (%rax),%eax
or     -0xc(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0x8(%rbp),%edi
mov    0x2e5c(%rip),%rax
mov    (%rax),%esi
mov    -0xc(%rbp),%edx
call   1040 <fcntl@plt>
cmp    $0xffffffff,%eax
jne    11a7 <fdnb+0x87>
lea    0xe7d(%rip),%rdi
call   1030 <warn@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    11ae <fdnb+0x8e>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<fdnb>:
push   %rbp
push   %rbx
push   %rax
mov    %edi,%ebp
mov    0x2ea4(%rip),%rax
mov    (%rax),%esi
xor    %ebx,%ebx
xor    %edx,%edx
call   1040 <fcntl@plt>
cmp    $0xffffffff,%eax
je     1165 <fdnb+0x45>
mov    0x2ea5(%rip),%rcx
or     (%rcx),%eax
mov    0x2e8c(%rip),%rcx
mov    (%rcx),%esi
mov    %ebp,%edi
mov    %eax,%edx
call   1040 <fcntl@plt>
cmp    $0xffffffff,%eax
jne    1176 <fdnb+0x56>
lea    0xeb0(%rip),%rdi
jmp    116c <fdnb+0x4c>
lea    0xe94(%rip),%rdi
call   1030 <warn@plt>
mov    $0xffffffff,%ebx
mov    %ebx,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@F_GETFL = global i32 0
@.str = [19 x i8] c"fcntl getfl failed\00"
@O_NONBLOCK = global i32 0
@F_SETFL = global i32 0
@.str.1 = [19 x i8] c"fcntl setfl failed\00"
define i32 @fdnb(i32 %0) {
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
store i32 %0, i32* %3
%5 = load i32, i32* %3
%6 = load i32, i32* @F_GETFL
%7 = call i32 @fcntl(i32 %5, i32 %6, i32 0)
store i32 %7, i32* %4
%8 = load i32, i32* %4
%9 = icmp eq i32 %8, -1
br i1 %9, label %10, label %12
10: ; preds = %1
%11 = call i32 @warn(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0))
store i32 -1, i32* %2
br label %24
12: ; preds = %1
%13 = load i32, i32* @O_NONBLOCK
%14 = load i32, i32* %4
%15 = or i32 %14, %13
store i32 %15, i32* %4
%16 = load i32, i32* %3
%17 = load i32, i32* @F_SETFL
%18 = load i32, i32* %4
%19 = call i32 @fcntl(i32 %16, i32 %17, i32 %18)
%20 = icmp eq i32 %19, -1
br i1 %20, label %21, label %23
21: ; preds = %12
%22 = call i32 @warn(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.1, i64 0, i64 0))
store i32 -1, i32* %2
br label %24
23: ; preds = %12
store i32 0, i32* %2
br label %24
24: ; preds = %23, %21, %10
%25 = load i32, i32* %2
ret i32 %25
}

LLVM IR (-O2):
@F_GETFL = global i32 0
@.str = [19 x i8] c"fcntl getfl failed\00"
@O_NONBLOCK = global i32 0
@F_SETFL = global i32 0
@.str.1 = [19 x i8] c"fcntl setfl failed\00"
define i32 @fdnb(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 %11, label %5
5: ; preds = %1
%6 = load i32, i32* @O_NONBLOCK
%7 = or i32 %6, %3
%8 = load i32, i32* @F_SETFL
%9 = tail call i32 @fcntl(i32 %0, i32 %8, i32 %7)
%10 = icmp eq i32 %9, -1
br i1 %10, label %11, label %14
11: ; preds = %5, %1
%12 = phi i8* [ getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0), %1 ], [ getelementptr inbounds ([19 x i8], [19 x i8]* @.str.1, i64 0, i64 0), %5 ]
%13 = tail call i32 @warn(i8* %12)
br label %14
14: ; preds = %11, %5
%15 = phi i32 [ 0, %5 ], [ -1, %11 ]
ret i32 %15
}