#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*/ server_address;

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int /*<<< orphan*/ INADDR_ANY;
int /*<<< orphan*/ SOCK_STREAM;
int bind(int, struct sockaddr *, int);
int /*<<< orphan*/ bzero(char *, int);
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ htons(int);
int listen(int, int);
int /*<<< orphan*/ perror(char *);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int open_listening_port(int server_port) {
  struct sockaddr_in server_address;
  int server_socket;
  server_socket = socket(AF_INET, SOCK_STREAM, 0);
  if (server_socket == -1) {
    perror("socket");
    exit(1);
    ;
  }
  bzero((char *)&server_address, sizeof(server_address));
  server_address.sin_family = AF_INET;
  server_address.sin_addr.s_addr = INADDR_ANY;
  server_address.sin_port = htons(server_port);
  if (bind(server_socket, (struct sockaddr *)&server_address,
           sizeof(server_address)) == -1) {
    perror("bind");
    exit(1);
    ;
  }
  if (listen(server_socket, 40) == -1) {
    perror("listen");
    exit(1);
    ;
  }
  return server_socket;
}


x86 assembly (clang, -O0):
<open_listening_port>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x4(%rbp)
mov    0x2e66(%rip),%rax
mov    (%rax),%edi
mov    0x2e45(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1090 <socket@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0xffffffff,-0x14(%rbp)
jne    11b7 <open_listening_port+0x47>
lea    0xe58(%rip),%rdi
call   1060 <perror@plt>
mov    $0x1,%edi
call   1080 <exit@plt>
lea    -0x10(%rbp),%rdi
mov    $0xc,%esi
call   1070 <bzero@plt>
mov    0x2e1c(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x8(%rbp)
mov    0x2e08(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0xc(%rbp)
mov    -0x4(%rbp),%edi
call   1030 <htons@plt>
mov    %eax,-0x10(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x10(%rbp),%rsi
mov    $0xc,%edx
call   1050 <bind@plt>
cmp    $0xffffffff,%eax
jne    1218 <open_listening_port+0xa8>
lea    0xdfe(%rip),%rdi
call   1060 <perror@plt>
mov    $0x1,%edi
call   1080 <exit@plt>
mov    -0x14(%rbp),%edi
mov    $0x28,%esi
call   1040 <listen@plt>
cmp    $0xffffffff,%eax
jne    1244 <open_listening_port+0xd4>
lea    0xdd7(%rip),%rdi
call   1060 <perror@plt>
mov    $0x1,%edi
call   1080 <exit@plt>
mov    -0x14(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<open_listening_port>:
push   %rbp
push   %r15
push   %r14
push   %rbx
sub    $0x18,%rsp
mov    %edi,%ebp
mov    0x2e65(%rip),%r15
mov    (%r15),%edi
mov    0x2e43(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1090 <socket@plt>
cmp    $0xffffffff,%eax
je     1200 <open_listening_port+0x90>
mov    %eax,%ebx
lea    0x8(%rsp),%r14
mov    %r14,%rdi
mov    $0xc,%esi
call   1070 <bzero@plt>
mov    (%r15),%eax
mov    %eax,0x10(%rsp)
mov    0x2e23(%rip),%rax
mov    (%rax),%eax
mov    %eax,0xc(%rsp)
mov    %ebp,%edi
call   1030 <htons@plt>
mov    %eax,0x8(%rsp)
mov    %ebx,%edi
mov    %r14,%rsi
mov    $0xc,%edx
call   1050 <bind@plt>
cmp    $0xffffffff,%eax
je     1209 <open_listening_port+0x99>
mov    %ebx,%edi
mov    $0x28,%esi
call   1040 <listen@plt>
cmp    $0xffffffff,%eax
je     1212 <open_listening_port+0xa2>
mov    %ebx,%eax
add    $0x18,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret
lea    0xdf9(%rip),%rdi
jmp    1219 <open_listening_port+0xa9>
lea    0xdf7(%rip),%rdi
jmp    1219 <open_listening_port+0xa9>
lea    0xdf3(%rip),%rdi
call   1060 <perror@plt>
mov    $0x1,%edi
call   1080 <exit@plt>

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
@.str = [7 x i8] c"socket\00"
@INADDR_ANY = global i32 0
@.str.1 = [5 x i8] c"bind\00"
@.str.2 = [7 x i8] c"listen\00"
define i32 @open_listening_port(i32 %0) {
%2 = alloca i32
%3 = alloca %struct.sockaddr_in
%4 = alloca i32
store i32 %0, i32* %2
%5 = load i32, i32* @AF_INET
%6 = load i32, i32* @SOCK_STREAM
%7 = call i32 @socket(i32 %5, i32 %6, i32 0)
store i32 %7, i32* %4
%8 = load i32, i32* %4
%9 = icmp eq i32 %8, -1
br i1 %9, label %10, label %13
10: ; preds = %1
%11 = call i32 @perror(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%12 = call i32 @exit(i32 1)
unreachable
13: ; preds = %1
%14 = bitcast %struct.sockaddr_in* %3 to i8*
%15 = call i32 @bzero(i8* %14, i32 12)
%16 = load i32, i32* @AF_INET
%17 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i32 0, i32 2
store i32 %16, i32* %17
%18 = load i32, i32* @INADDR_ANY
%19 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i32 0, i32 1
%20 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %19, i32 0, i32 0
store i32 %18, i32* %20
%21 = load i32, i32* %2
%22 = call i32 @htons(i32 %21)
%23 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i32 0, i32 0
store i32 %22, i32* %23
%24 = load i32, i32* %4
%25 = bitcast %struct.sockaddr_in* %3 to %struct.sockaddr*
%26 = call i32 @bind(i32 %24, %struct.sockaddr* %25, i32 12)
%27 = icmp eq i32 %26, -1
br i1 %27, label %28, label %31
28: ; preds = %13
%29 = call i32 @perror(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0))
%30 = call i32 @exit(i32 1)
unreachable
31: ; preds = %13
%32 = load i32, i32* %4
%33 = call i32 @listen(i32 %32, i32 40)
%34 = icmp eq i32 %33, -1
br i1 %34, label %35, label %38
35: ; preds = %31
%36 = call i32 @perror(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0))
%37 = call i32 @exit(i32 1)
unreachable
38: ; preds = %31
%39 = load i32, i32* %4
ret i32 %39
}

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
@.str = [7 x i8] c"socket\00"
@INADDR_ANY = global i32 0
@.str.1 = [5 x i8] c"bind\00"
@.str.2 = [7 x i8] c"listen\00"
define i32 @open_listening_port(i32 %0) {
%2 = alloca %struct.sockaddr_in
%3 = bitcast %struct.sockaddr_in* %2 to i8*
%4 = load i32, i32* @AF_INET
%5 = load i32, i32* @SOCK_STREAM
%6 = tail call i32 @socket(i32 %4, i32 %5, i32 0)
%7 = icmp eq i32 %6, -1
br i1 %7, label %8, label %11
8: ; preds = %1
%9 = tail call i32 @perror(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%10 = tail call i32 @exit(i32 1)
unreachable
11: ; preds = %1
%12 = call i32 @bzero(i8* %3, i32 12)
%13 = load i32, i32* @AF_INET
%14 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %2, i64 0, i32 2
store i32 %13, i32* %14
%15 = load i32, i32* @INADDR_ANY
%16 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %2, i64 0, i32 1, i32 0
store i32 %15, i32* %16
%17 = tail call i32 @htons(i32 %0)
%18 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %2, i64 0, i32 0
store i32 %17, i32* %18
%19 = bitcast %struct.sockaddr_in* %2 to %struct.sockaddr*
%20 = call i32 @bind(i32 %6, %struct.sockaddr* %19, i32 12)
%21 = icmp eq i32 %20, -1
br i1 %21, label %22, label %25
22: ; preds = %11
%23 = call i32 @perror(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0))
%24 = call i32 @exit(i32 1)
unreachable
25: ; preds = %11
%26 = call i32 @listen(i32 %6, i32 40)
%27 = icmp eq i32 %26, -1
br i1 %27, label %28, label %31
28: ; preds = %25
%29 = call i32 @perror(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0))
%30 = call i32 @exit(i32 1)
unreachable
31: ; preds = %25
ret i32 %6
}