#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 */
typedef int int32_t;

/* Variables and functions */
int /*<<< orphan*/ F_GETFL;
int /*<<< orphan*/ F_SETFL;
int O_NONBLOCK;
scalar_t__ fcntl(int, int /*<<< orphan*/, ...);
int32_t set_fd_nonblock(int32_t fd) {
  int32_t flags;
  int32_t retval = -1;
  flags = fcntl(fd, F_GETFL);
  if (flags >= 0) {
    flags |= O_NONBLOCK;
    if (fcntl(fd, F_SETFL, flags) >= 0) {
      retval = 0;
    }
  }
  return retval;
}


x86 assembly (clang, -O0):
<set_fd_nonblock>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x4(%rbp)
movl   $0xffffffff,-0xc(%rbp)
mov    -0x4(%rbp),%edi
mov    0x2ea4(%rip),%rax
mov    (%rax),%esi
mov    $0x0,%al
call   1030 <fcntl@plt>
mov    %eax,-0x8(%rbp)
cmpl   $0x0,-0x8(%rbp)
jl     117d <set_fd_nonblock+0x6d>
mov    0x2e9f(%rip),%rax
mov    (%rax),%eax
or     -0x8(%rbp),%eax
mov    %eax,-0x8(%rbp)
mov    -0x4(%rbp),%edi
mov    0x2e7d(%rip),%rax
mov    (%rax),%esi
mov    -0x8(%rbp),%edx
mov    $0x0,%al
call   1030 <fcntl@plt>
cmp    $0x0,%rax
jl     1178 <set_fd_nonblock+0x68>
movl   $0x0,-0xc(%rbp)
jmp    117d <set_fd_nonblock+0x6d>
mov    -0xc(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<set_fd_nonblock>:
push   %rbx
mov    %edi,%ebx
mov    0x2eb6(%rip),%rax
mov    (%rax),%esi
xor    %eax,%eax
call   1030 <fcntl@plt>
test   %eax,%eax
js     114a <set_fd_nonblock+0x3a>
mov    0x2eba(%rip),%rcx
or     (%rcx),%eax
mov    0x2ea1(%rip),%rcx
mov    (%rcx),%esi
mov    %ebx,%edi
mov    %eax,%edx
xor    %eax,%eax
call   1030 <fcntl@plt>
sar    $0x3f,%rax
pop    %rbx
ret
mov    $0xffffffff,%eax
pop    %rbx
ret

LLVM IR (-O0):
@F_GETFL = global i32 0
@O_NONBLOCK = global i32 0
@F_SETFL = global i32 0
define i32 @set_fd_nonblock(i32 %0) {
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
store i32 %0, i32* %2
store i32 -1, i32* %4
%5 = load i32, i32* %2
%6 = load i32, i32* @F_GETFL
%7 = call i64 (i32, i32, ...) @fcntl(i32 %5, i32 %6)
%8 = trunc i64 %7 to i32
store i32 %8, i32* %3
%9 = load i32, i32* %3
%10 = icmp sge i32 %9, 0
br i1 %10, label %11, label %22
11: ; preds = %1
%12 = load i32, i32* @O_NONBLOCK
%13 = load i32, i32* %3
%14 = or i32 %13, %12
store i32 %14, i32* %3
%15 = load i32, i32* %2
%16 = load i32, i32* @F_SETFL
%17 = load i32, i32* %3
%18 = call i64 (i32, i32, ...) @fcntl(i32 %15, i32 %16, i32 %17)
%19 = icmp sge i64 %18, 0
br i1 %19, label %20, label %21
20: ; preds = %11
store i32 0, i32* %4
br label %21
21: ; preds = %20, %11
br label %22
22: ; preds = %21, %1
%23 = load i32, i32* %4
ret i32 %23
}

LLVM IR (-O2):
@F_GETFL = global i32 0
@O_NONBLOCK = global i32 0
@F_SETFL = global i32 0
define i32 @set_fd_nonblock(i32 %0) {
%2 = load i32, i32* @F_GETFL
%3 = tail call i64 (i32, i32, ...) @fcntl(i32 %0, i32 %2)
%4 = trunc i64 %3 to i32
%5 = icmp sgt i32 %4, -1
br i1 %5, label %6, label %13
6: ; preds = %1
%7 = load i32, i32* @O_NONBLOCK
%8 = or i32 %7, %4
%9 = load i32, i32* @F_SETFL
%10 = tail call i64 (i32, i32, ...) @fcntl(i32 %0, i32 %9, i32 %8)
%11 = ashr i64 %10, 63
%12 = trunc i64 %11 to i32
br label %13
13: ; preds = %6, %1
%14 = phi i32 [ -1, %1 ], [ %12, %6 ]
ret i32 %14
}