#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 /*<<< orphan*/ abort();
int fcntl(int, int /*<<< orphan*/, int);
int /*<<< orphan*/ perror(char *);
void set_nonblocking(int fd) {
  int flags = 0;
  flags = fcntl(fd, F_GETFL, 0);
  if (flags == -1) {
    perror("fcntl");
    abort();
  }
  if (-1 == fcntl(fd, F_SETFL, flags | O_NONBLOCK)) {
    perror("fcntl");
    abort();
  }
}


x86 assembly (clang, -O0):
<set_nonblocking>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x4(%rbp)
movl   $0x0,-0x8(%rbp)
mov    -0x4(%rbp),%edi
mov    0x2e84(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1040 <fcntl@plt>
mov    %eax,-0x8(%rbp)
cmpl   $0xffffffff,-0x8(%rbp)
jne    1175 <set_nonblocking+0x45>
lea    0xe97(%rip),%rdi
call   1050 <perror@plt>
mov    $0x0,%al
call   1030 <abort@plt>
mov    -0x4(%rbp),%edi
mov    0x2e59(%rip),%rax
mov    (%rax),%esi
mov    -0x8(%rbp),%edx
mov    0x2e5d(%rip),%rax
or     (%rax),%edx
call   1040 <fcntl@plt>
mov    %eax,%ecx
mov    $0xffffffff,%eax
cmp    %ecx,%eax
jne    11b4 <set_nonblocking+0x84>
lea    0xe58(%rip),%rdi
call   1050 <perror@plt>
mov    $0x0,%al
call   1030 <abort@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<set_nonblocking>:
push   %rbx
mov    %edi,%ebx
mov    0x2e96(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1040 <fcntl@plt>
cmp    $0xffffffff,%eax
je     116a <set_nonblocking+0x3a>
mov    0x2e89(%rip),%rcx
mov    (%rcx),%esi
mov    0x2e90(%rip),%rcx
or     (%rcx),%eax
mov    %ebx,%edi
mov    %eax,%edx
call   1040 <fcntl@plt>
cmp    $0xffffffff,%eax
je     116a <set_nonblocking+0x3a>
pop    %rbx
ret
lea    0xe8f(%rip),%rdi
call   1050 <perror@plt>
xor    %eax,%eax
call   1030 <abort@plt>

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

LLVM IR (-O2):
@F_GETFL = global i32 0
@.str = [6 x i8] c"fcntl\00"
@F_SETFL = global i32 0
@O_NONBLOCK = global i32 0
define void @set_nonblocking(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 %8
5: ; preds = %1
%6 = tail call i32 @perror(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0))
%7 = tail call i32 (...) @abort()
unreachable
8: ; preds = %1
%9 = load i32, i32* @F_SETFL
%10 = load i32, i32* @O_NONBLOCK
%11 = or i32 %10, %3
%12 = tail call i32 @fcntl(i32 %0, i32 %9, i32 %11)
%13 = icmp eq i32 %12, -1
br i1 %13, label %14, label %17
14: ; preds = %8
%15 = tail call i32 @perror(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0))
%16 = tail call i32 (...) @abort()
unreachable
17: ; preds = %8
ret void
}