#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*/ err_exit(char *);
int fcntl(int, int /*<<< orphan*/, int);
int to_nonblock(int sfd) {
  int flags = fcntl(sfd, F_GETFL, 0);
  if (flags == -1)
    err_exit("fcntl(F_GETFL)");
  flags |= O_NONBLOCK;
  if (fcntl(sfd, F_SETFL, flags) == -1)
    err_exit("fcntl(F_SETFL");
  return 0;
}


x86 assembly (clang, -O0):
<to_nonblock>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x4(%rbp)
mov    -0x4(%rbp),%edi
mov    0x2e9b(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1030 <fcntl@plt>
mov    %eax,-0x8(%rbp)
cmpl   $0xffffffff,-0x8(%rbp)
jne    1157 <to_nonblock+0x37>
lea    0xeae(%rip),%rdi
call   1040 <err_exit@plt>
mov    0x2e8a(%rip),%rax
mov    (%rax),%eax
or     -0x8(%rbp),%eax
mov    %eax,-0x8(%rbp)
mov    -0x4(%rbp),%edi
mov    0x2e68(%rip),%rax
mov    (%rax),%esi
mov    -0x8(%rbp),%edx
call   1030 <fcntl@plt>
cmp    $0xffffffff,%eax
jne    118f <to_nonblock+0x6f>
lea    0xe85(%rip),%rdi
call   1040 <err_exit@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<to_nonblock>:
push   %rbp
push   %rbx
push   %rax
mov    %edi,%ebx
mov    0x2ea4(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1030 <fcntl@plt>
mov    %eax,%ebp
cmp    $0xffffffff,%eax
jne    1148 <to_nonblock+0x28>
lea    0xebd(%rip),%rdi
call   1040 <err_exit@plt>
mov    0x2e99(%rip),%rax
mov    (%rax),%edx
or     %ebp,%edx
mov    0x2e7e(%rip),%rax
mov    (%rax),%esi
mov    %ebx,%edi
call   1030 <fcntl@plt>
cmp    $0xffffffff,%eax
jne    1174 <to_nonblock+0x54>
lea    0xea0(%rip),%rdi
call   1040 <err_exit@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@F_GETFL = global i32 0
@.str = [15 x i8] c"fcntl(F_GETFL)\00"
@O_NONBLOCK = global i32 0
@F_SETFL = global i32 0
@.str.1 = [14 x i8] c"fcntl(F_SETFL\00"
define i32 @to_nonblock(i32 %0) {
%2 = alloca i32
%3 = alloca i32
store i32 %0, i32* %2
%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 %11
9: ; preds = %1
%10 = call i32 @err_exit(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0))
br label %11
11: ; preds = %9, %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 i32 @fcntl(i32 %15, i32 %16, i32 %17)
%19 = icmp eq i32 %18, -1
br i1 %19, label %20, label %22
20: ; preds = %11
%21 = call i32 @err_exit(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0))
br label %22
22: ; preds = %20, %11
ret i32 0
}

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