#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 */
typedef struct TYPE_2__ TYPE_1__;

/* Type definitions */
struct TYPE_2__ {
  int /*<<< orphan*/ s_addr;
};
struct sockaddr_in {
  int /*<<< orphan*/ sin_port;
  TYPE_1__ sin_addr;
  int /*<<< orphan*/ sin_family;
};
struct sockaddr {
  int dummy;
};
typedef int /*<<< orphan*/ sa;

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int F_GETFL;
int F_SETFL;
int /*<<< orphan*/ INADDR_ANY;
int O_NONBLOCK;
int /*<<< orphan*/ SOCK_STREAM;
int accept(int, struct sockaddr *, int /*<<< orphan*/ *);
int /*<<< orphan*/ bind(int, struct sockaddr *, int);
int /*<<< orphan*/ close(int);
int fcntl(int, int, int);
int /*<<< orphan*/ htonl(int /*<<< orphan*/);
int /*<<< orphan*/ htons(int);
int /*<<< orphan*/ listen(int, int);
int /*<<< orphan*/ memset(struct sockaddr_in *, int /*<<< orphan*/, int);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int main() {
  struct sockaddr_in sa;
  int flags, listenfd, cfd;
  listenfd = socket(AF_INET, SOCK_STREAM, 0);
  flags = fcntl(listenfd, F_GETFL, 0);
  fcntl(listenfd, F_SETFL, flags | O_NONBLOCK);
  memset(&sa, 0, sizeof(sa));
  sa.sin_family = AF_INET;
  sa.sin_addr.s_addr = htonl(INADDR_ANY);
  sa.sin_port = htons(8765);
  bind(listenfd, (struct sockaddr *)&sa, sizeof(sa));
  listen(listenfd, 7);
  cfd = accept(listenfd, (struct sockaddr *)NULL, NULL);
  close(cfd);
  flags = fcntl(-1, F_GETFL, 0);
  flags = fcntl(listenfd, -1, 0);
  flags = fcntl(listenfd, F_GETFL, -1);
  close(listenfd);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    0x2e42(%rip),%rax
mov    (%rax),%edi
mov    0x2e11(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   10b0 <socket@plt>
mov    %eax,-0x18(%rbp)
mov    -0x18(%rbp),%edi
mov    0x2df3(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1030 <fcntl@plt>
mov    %eax,-0x14(%rbp)
mov    -0x18(%rbp),%edi
mov    0x2ded(%rip),%rax
mov    (%rax),%esi
mov    -0x14(%rbp),%edx
mov    0x2df9(%rip),%rax
or     (%rax),%edx
call   1030 <fcntl@plt>
lea    -0x10(%rbp),%rdi
xor    %esi,%esi
mov    $0xc,%edx
call   1060 <memset@plt>
mov    0x2de3(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x8(%rbp)
mov    0x2dc7(%rip),%rax
mov    (%rax),%edi
call   1050 <htonl@plt>
mov    %eax,-0xc(%rbp)
mov    $0x223d,%edi
call   1040 <htons@plt>
mov    %eax,-0x10(%rbp)
mov    -0x18(%rbp),%edi
lea    -0x10(%rbp),%rsi
mov    $0xc,%edx
call   1090 <bind@plt>
mov    -0x18(%rbp),%edi
mov    $0x7,%esi
call   1080 <listen@plt>
mov    -0x18(%rbp),%edi
xor    %eax,%eax
mov    %eax,%edx
mov    %rdx,%rsi
call   10a0 <accept@plt>
mov    %eax,-0x1c(%rbp)
mov    -0x1c(%rbp),%edi
call   1070 <close@plt>
mov    0x2d51(%rip),%rax
mov    (%rax),%esi
mov    $0xffffffff,%edi
xor    %edx,%edx
call   1030 <fcntl@plt>
mov    %eax,-0x14(%rbp)
mov    -0x18(%rbp),%edi
mov    $0xffffffff,%esi
xor    %edx,%edx
call   1030 <fcntl@plt>
mov    %eax,-0x14(%rbp)
mov    -0x18(%rbp),%edi
mov    0x2d24(%rip),%rax
mov    (%rax),%esi
mov    $0xffffffff,%edx
call   1030 <fcntl@plt>
mov    %eax,-0x14(%rbp)
mov    -0x18(%rbp),%edi
call   1070 <close@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %r12
push   %rbx
sub    $0x18,%rsp
mov    0x2e46(%rip),%r12
mov    (%r12),%edi
mov    0x2e13(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   10b0 <socket@plt>
mov    %eax,%ebx
mov    0x2df9(%rip),%r15
mov    (%r15),%esi
mov    %eax,%edi
xor    %edx,%edx
call   1030 <fcntl@plt>
mov    0x2df6(%rip),%rcx
mov    (%rcx),%esi
mov    0x2e05(%rip),%rcx
or     (%rcx),%eax
mov    %ebx,%edi
mov    %eax,%edx
call   1030 <fcntl@plt>
lea    0x8(%rsp),%r14
mov    %r14,%rdi
xor    %esi,%esi
mov    $0xc,%edx
call   1060 <memset@plt>
mov    (%r12),%eax
mov    %eax,0x10(%rsp)
mov    0x2dcf(%rip),%rax
mov    (%rax),%edi
call   1050 <htonl@plt>
mov    %eax,0xc(%rsp)
mov    $0x223d,%edi
call   1040 <htons@plt>
mov    %eax,0x8(%rsp)
mov    %ebx,%edi
mov    %r14,%rsi
mov    $0xc,%edx
call   1090 <bind@plt>
mov    %ebx,%edi
mov    $0x7,%esi
call   1080 <listen@plt>
mov    %ebx,%edi
xor    %esi,%esi
xor    %edx,%edx
call   10a0 <accept@plt>
mov    %eax,%edi
call   1070 <close@plt>
mov    (%r15),%esi
mov    $0xffffffff,%edi
xor    %edx,%edx
call   1030 <fcntl@plt>
mov    %ebx,%edi
mov    $0xffffffff,%esi
xor    %edx,%edx
call   1030 <fcntl@plt>
mov    (%r15),%esi
mov    %ebx,%edi
mov    $0xffffffff,%edx
call   1030 <fcntl@plt>
mov    %ebx,%edi
call   1070 <close@plt>
xor    %eax,%eax
add    $0x18,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
%struct.sockaddr_in = type { i32, %struct.TYPE_2__, i32 }
%struct.TYPE_2__ = type { i32 }
%struct.sockaddr = type { i32 }
@AF_INET = global i32 0
@SOCK_STREAM = global i32 0
@F_GETFL = global i32 0
@F_SETFL = global i32 0
@O_NONBLOCK = global i32 0
@INADDR_ANY = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca %struct.sockaddr_in
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
store i32 0, i32* %1
%6 = load i32, i32* @AF_INET
%7 = load i32, i32* @SOCK_STREAM
%8 = call i32 @socket(i32 %6, i32 %7, i32 0)
store i32 %8, i32* %4
%9 = load i32, i32* %4
%10 = load i32, i32* @F_GETFL
%11 = call i32 @fcntl(i32 %9, i32 %10, i32 0)
store i32 %11, i32* %3
%12 = load i32, i32* %4
%13 = load i32, i32* @F_SETFL
%14 = load i32, i32* %3
%15 = load i32, i32* @O_NONBLOCK
%16 = or i32 %14, %15
%17 = call i32 @fcntl(i32 %12, i32 %13, i32 %16)
%18 = call i32 @memset(%struct.sockaddr_in* %2, i32 0, i32 12)
%19 = load i32, i32* @AF_INET
%20 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %2, i32 0, i32 2
store i32 %19, i32* %20
%21 = load i32, i32* @INADDR_ANY
%22 = call i32 @htonl(i32 %21)
%23 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %2, i32 0, i32 1
%24 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %23, i32 0, i32 0
store i32 %22, i32* %24
%25 = call i32 @htons(i32 8765)
%26 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %2, i32 0, i32 0
store i32 %25, i32* %26
%27 = load i32, i32* %4
%28 = bitcast %struct.sockaddr_in* %2 to %struct.sockaddr*
%29 = call i32 @bind(i32 %27, %struct.sockaddr* %28, i32 12)
%30 = load i32, i32* %4
%31 = call i32 @listen(i32 %30, i32 7)
%32 = load i32, i32* %4
%33 = call i32 @accept(i32 %32, %struct.sockaddr* null, i32* null)
store i32 %33, i32* %5
%34 = load i32, i32* %5
%35 = call i32 @close(i32 %34)
%36 = load i32, i32* @F_GETFL
%37 = call i32 @fcntl(i32 -1, i32 %36, i32 0)
store i32 %37, i32* %3
%38 = load i32, i32* %4
%39 = call i32 @fcntl(i32 %38, i32 -1, i32 0)
store i32 %39, i32* %3
%40 = load i32, i32* %4
%41 = load i32, i32* @F_GETFL
%42 = call i32 @fcntl(i32 %40, i32 %41, i32 -1)
store i32 %42, i32* %3
%43 = load i32, i32* %4
%44 = call i32 @close(i32 %43)
ret i32 0
}

LLVM IR (-O2):
%struct.sockaddr_in = type { i32, %struct.TYPE_2__, i32 }
%struct.TYPE_2__ = type { i32 }
%struct.sockaddr = type { i32 }
@AF_INET = global i32 0
@SOCK_STREAM = global i32 0
@F_GETFL = global i32 0
@F_SETFL = global i32 0
@O_NONBLOCK = global i32 0
@INADDR_ANY = global i32 0
define i32 @main() {
%1 = alloca %struct.sockaddr_in
%2 = bitcast %struct.sockaddr_in* %1 to i8*
%3 = load i32, i32* @AF_INET
%4 = load i32, i32* @SOCK_STREAM
%5 = tail call i32 @socket(i32 %3, i32 %4, i32 0)
%6 = load i32, i32* @F_GETFL
%7 = tail call i32 @fcntl(i32 %5, i32 %6, i32 0)
%8 = load i32, i32* @F_SETFL
%9 = load i32, i32* @O_NONBLOCK
%10 = or i32 %9, %7
%11 = tail call i32 @fcntl(i32 %5, i32 %8, i32 %10)
%12 = call i32 @memset(%struct.sockaddr_in* %1, i32 0, i32 12)
%13 = load i32, i32* @AF_INET
%14 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %1, i64 0, i32 2
store i32 %13, i32* %14
%15 = load i32, i32* @INADDR_ANY
%16 = call i32 @htonl(i32 %15)
%17 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %1, i64 0, i32 1, i32 0
store i32 %16, i32* %17
%18 = call i32 @htons(i32 8765)
%19 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %1, i64 0, i32 0
store i32 %18, i32* %19
%20 = bitcast %struct.sockaddr_in* %1 to %struct.sockaddr*
%21 = call i32 @bind(i32 %5, %struct.sockaddr* %20, i32 12)
%22 = call i32 @listen(i32 %5, i32 7)
%23 = call i32 @accept(i32 %5, %struct.sockaddr* null, i32* null)
%24 = call i32 @close(i32 %23)
%25 = load i32, i32* @F_GETFL
%26 = call i32 @fcntl(i32 -1, i32 %25, i32 0)
%27 = call i32 @fcntl(i32 %5, i32 -1, i32 0)
%28 = load i32, i32* @F_GETFL
%29 = call i32 @fcntl(i32 %5, i32 %28, i32 -1)
%30 = call i32 @close(i32 %5)
ret i32 0
}