#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*/ perror(char *);
int setnonblocking(int fd) {
  int flags;
  if (-1 == (flags = fcntl(fd, F_GETFL, 0))) {
    perror("setnonblocking error");
    return -1;
  }
  return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
}


x86 assembly (clang, -O0):
<setnonblocking>:
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   1030 <fcntl@plt>
mov    %eax,%ecx
mov    %ecx,-0xc(%rbp)
mov    $0xffffffff,%eax
cmp    %ecx,%eax
jne    1168 <setnonblocking+0x48>
lea    0xea9(%rip),%rdi
call   1040 <perror@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    1188 <setnonblocking+0x68>
mov    -0x8(%rbp),%edi
mov    0x2e66(%rip),%rax
mov    (%rax),%esi
mov    -0xc(%rbp),%edx
mov    0x2e6a(%rip),%rax
or     (%rax),%edx
call   1030 <fcntl@plt>
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<setnonblocking>:
push   %rbx
mov    %edi,%ebx
mov    0x2ea6(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1030 <fcntl@plt>
cmp    $0xffffffff,%eax
je     1154 <setnonblocking+0x34>
mov    0x2e99(%rip),%rcx
mov    (%rcx),%esi
mov    0x2ea0(%rip),%rcx
or     (%rcx),%eax
mov    %ebx,%edi
mov    %eax,%edx
pop    %rbx
jmp    1030 <fcntl@plt>
lea    0xea5(%rip),%rdi
call   1040 <perror@plt>
mov    $0xffffffff,%eax
pop    %rbx
ret

LLVM IR (-O0):
@F_GETFL = global i32 0
@.str = [21 x i8] c"setnonblocking error\00"
@F_SETFL = global i32 0
@O_NONBLOCK = global i32 0
define i32 @setnonblocking(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 = icmp eq i32 -1, %7
br i1 %8, label %9, label %11
9: ; preds = %1
%10 = call i32 @perror(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0))
store i32 -1, i32* %2
br label %18
11: ; preds = %1
%12 = load i32, i32* %3
%13 = load i32, i32* @F_SETFL
%14 = load i32, i32* %4
%15 = load i32, i32* @O_NONBLOCK
%16 = or i32 %14, %15
%17 = call i32 @fcntl(i32 %12, i32 %13, i32 %16)
store i32 %17, i32* %2
br label %18
18: ; preds = %11, %9
%19 = load i32, i32* %2
ret i32 %19
}

LLVM IR (-O2):
@F_GETFL = global i32 0
@.str = [21 x i8] c"setnonblocking error\00"
@F_SETFL = global i32 0
@O_NONBLOCK = global i32 0
define i32 @setnonblocking(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 %5, label %7
5: ; preds = %1
%6 = tail call i32 @perror(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0))
br label %12
7: ; preds = %1
%8 = load i32, i32* @F_SETFL
%9 = load i32, i32* @O_NONBLOCK
%10 = or i32 %9, %3
%11 = tail call i32 @fcntl(i32 %0, i32 %8, i32 %10)
br label %12
12: ; preds = %7, %5
%13 = phi i32 [ -1, %5 ], [ %11, %7 ]
ret i32 %13
}