#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 {
  TYPE_1__ sin_addr;
  int /*<<< orphan*/ sin_port;
  int /*<<< orphan*/ sin_family;
};
struct sockaddr {
  int dummy;
};
typedef int /*<<< orphan*/ saddr;

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int /*<<< orphan*/ INADDR_ANY;
int /*<<< orphan*/ SOCK_STREAM;
int /*<<< orphan*/ SOL_SOCKET;
int /*<<< orphan*/ SO_REUSEADDR;
int bind(int, struct sockaddr *, int);
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ htons(int const);
int listen(int, int);
int /*<<< orphan*/ perror(char *);
int setsockopt(int, int /*<<< orphan*/, int /*<<< orphan*/, int *, int);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int gen_socket4(const int port) {
  int server_socket4;
  server_socket4 = socket(AF_INET, SOCK_STREAM, 0);
  if (server_socket4 == -1) {
    perror("socket");
    exit(-1);
  }
  int optval = 1;
  if (setsockopt(server_socket4, SOL_SOCKET, SO_REUSEADDR, &optval,
                 sizeof(int)) == -1) {
    perror("Can not set SO_REUSEADR option on IPv4 socket");
    exit(-1);
  }
  struct sockaddr_in saddr;
  saddr.sin_family = AF_INET;
  saddr.sin_port = htons(port);
  saddr.sin_addr.s_addr = INADDR_ANY;
  if (bind(server_socket4, (struct sockaddr *)&saddr, sizeof(saddr)) == -1) {
    perror("bind server IPv4 socket");
    exit(-1);
  }
  if (listen(server_socket4, 10) == -1) {
    perror("listen IPv4 socket");
    exit(-1);
  }
  return server_socket4;
}


x86 assembly (clang, -O0):
<gen_socket4>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x4(%rbp)
mov    0x2e5e(%rip),%rax
mov    (%rax),%edi
mov    0x2e3d(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1090 <socket@plt>
mov    %eax,-0x8(%rbp)
cmpl   $0xffffffff,-0x8(%rbp)
jne    11b7 <gen_socket4+0x47>
lea    0xeaa(%rip),%rdi
call   1070 <perror@plt>
mov    $0xffffffff,%edi
call   1080 <exit@plt>
movl   $0x1,-0xc(%rbp)
mov    -0x8(%rbp),%edi
mov    0x2e20(%rip),%rax
mov    (%rax),%esi
mov    0x2def(%rip),%rax
mov    (%rax),%edx
lea    -0xc(%rbp),%rcx
mov    $0x4,%r8d
call   1030 <setsockopt@plt>
cmp    $0xffffffff,%eax
jne    1201 <gen_socket4+0x91>
lea    0xe0e(%rip),%rdi
call   1070 <perror@plt>
mov    $0xffffffff,%edi
call   1080 <exit@plt>
mov    0x2dd8(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x10(%rbp)
mov    -0x4(%rbp),%edi
call   1040 <htons@plt>
mov    %eax,-0x14(%rbp)
mov    0x2db9(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x18(%rbp)
mov    -0x8(%rbp),%edi
lea    -0x18(%rbp),%rsi
mov    $0xc,%edx
call   1060 <bind@plt>
cmp    $0xffffffff,%eax
jne    1254 <gen_socket4+0xe4>
lea    0xde9(%rip),%rdi
call   1070 <perror@plt>
mov    $0xffffffff,%edi
call   1080 <exit@plt>
mov    -0x8(%rbp),%edi
mov    $0xa,%esi
call   1050 <listen@plt>
cmp    $0xffffffff,%eax
jne    1280 <gen_socket4+0x110>
lea    0xdd5(%rip),%rdi
call   1070 <perror@plt>
mov    $0xffffffff,%edi
call   1080 <exit@plt>
mov    -0x8(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<gen_socket4>:
push   %rbp
push   %r14
push   %rbx
sub    $0x20,%rsp
mov    %edi,%ebp
mov    0x2e5f(%rip),%r14
mov    (%r14),%edi
mov    0x2e3d(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1090 <socket@plt>
cmp    $0xffffffff,%eax
je     1221 <gen_socket4+0xb1>
mov    %eax,%ebx
movl   $0x1,0xc(%rsp)
mov    0x2e3a(%rip),%rax
mov    (%rax),%esi
mov    0x2e09(%rip),%rax
mov    (%rax),%edx
lea    0xc(%rsp),%rcx
mov    %ebx,%edi
mov    $0x4,%r8d
call   1030 <setsockopt@plt>
cmp    $0xffffffff,%eax
je     122a <gen_socket4+0xba>
mov    (%r14),%eax
mov    %eax,0x18(%rsp)
mov    %ebp,%edi
call   1040 <htons@plt>
mov    %eax,0x14(%rsp)
mov    0x2def(%rip),%rax
mov    (%rax),%eax
mov    %eax,0x10(%rsp)
lea    0x10(%rsp),%rsi
mov    %ebx,%edi
mov    $0xc,%edx
call   1060 <bind@plt>
cmp    $0xffffffff,%eax
je     1233 <gen_socket4+0xc3>
mov    %ebx,%edi
mov    $0xa,%esi
call   1050 <listen@plt>
cmp    $0xffffffff,%eax
je     123c <gen_socket4+0xcc>
mov    %ebx,%eax
add    $0x20,%rsp
pop    %rbx
pop    %r14
pop    %rbp
ret
lea    0xe2a(%rip),%rdi
jmp    1243 <gen_socket4+0xd3>
lea    0xdcf(%rip),%rdi
jmp    1243 <gen_socket4+0xd3>
lea    0xdf4(%rip),%rdi
jmp    1243 <gen_socket4+0xd3>
lea    0xe03(%rip),%rdi
call   1070 <perror@plt>
mov    $0xffffffff,%edi
call   1080 <exit@plt>

LLVM IR (-O0):
%struct.sockaddr_in = type { %struct.TYPE_2__, i32, 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"
@SOL_SOCKET = global i32 0
@SO_REUSEADDR = global i32 0
@.str.1 = [46 x i8] c"Can not set SO_REUSEADR option on IPv4 socket\00"
@INADDR_ANY = global i32 0
@.str.2 = [24 x i8] c"bind server IPv4 socket\00"
@.str.3 = [19 x i8] c"listen IPv4 socket\00"
define i32 @gen_socket4(i32 %0) {
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
%5 = alloca %struct.sockaddr_in
store i32 %0, i32* %2
%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* %3
%9 = load i32, i32* %3
%10 = icmp eq i32 %9, -1
br i1 %10, label %11, label %14
11: ; preds = %1
%12 = call i32 @perror(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%13 = call i32 @exit(i32 -1)
unreachable
14: ; preds = %1
store i32 1, i32* %4
%15 = load i32, i32* %3
%16 = load i32, i32* @SOL_SOCKET
%17 = load i32, i32* @SO_REUSEADDR
%18 = call i32 @setsockopt(i32 %15, i32 %16, i32 %17, i32* %4, i32 4)
%19 = icmp eq i32 %18, -1
br i1 %19, label %20, label %23
20: ; preds = %14
%21 = call i32 @perror(i8* getelementptr inbounds ([46 x i8], [46 x i8]* @.str.1, i64 0, i64 0))
%22 = call i32 @exit(i32 -1)
unreachable
23: ; preds = %14
%24 = load i32, i32* @AF_INET
%25 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i32 0, i32 2
store i32 %24, i32* %25
%26 = load i32, i32* %2
%27 = call i32 @htons(i32 %26)
%28 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i32 0, i32 1
store i32 %27, i32* %28
%29 = load i32, i32* @INADDR_ANY
%30 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i32 0, i32 0
%31 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %30, i32 0, i32 0
store i32 %29, i32* %31
%32 = load i32, i32* %3
%33 = bitcast %struct.sockaddr_in* %5 to %struct.sockaddr*
%34 = call i32 @bind(i32 %32, %struct.sockaddr* %33, i32 12)
%35 = icmp eq i32 %34, -1
br i1 %35, label %36, label %39
36: ; preds = %23
%37 = call i32 @perror(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.2, i64 0, i64 0))
%38 = call i32 @exit(i32 -1)
unreachable
39: ; preds = %23
%40 = load i32, i32* %3
%41 = call i32 @listen(i32 %40, i32 10)
%42 = icmp eq i32 %41, -1
br i1 %42, label %43, label %46
43: ; preds = %39
%44 = call i32 @perror(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.3, i64 0, i64 0))
%45 = call i32 @exit(i32 -1)
unreachable
46: ; preds = %39
%47 = load i32, i32* %3
ret i32 %47
}

LLVM IR (-O2):
%struct.sockaddr_in = type { %struct.TYPE_2__, i32, 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"
@SOL_SOCKET = global i32 0
@SO_REUSEADDR = global i32 0
@.str.1 = [46 x i8] c"Can not set SO_REUSEADR option on IPv4 socket\00"
@INADDR_ANY = global i32 0
@.str.2 = [24 x i8] c"bind server IPv4 socket\00"
@.str.3 = [19 x i8] c"listen IPv4 socket\00"
define i32 @gen_socket4(i32 %0) {
%2 = alloca i32
%3 = alloca %struct.sockaddr_in
%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 = bitcast i32* %2 to i8*
store i32 1, i32* %2
%13 = load i32, i32* @SOL_SOCKET
%14 = load i32, i32* @SO_REUSEADDR
%15 = call i32 @setsockopt(i32 %6, i32 %13, i32 %14, i32* %2, i32 4)
%16 = icmp eq i32 %15, -1
br i1 %16, label %17, label %20
17: ; preds = %11
%18 = call i32 @perror(i8* getelementptr inbounds ([46 x i8], [46 x i8]* @.str.1, i64 0, i64 0))
%19 = call i32 @exit(i32 -1)
unreachable
20: ; preds = %11
%21 = bitcast %struct.sockaddr_in* %3 to i8*
%22 = load i32, i32* @AF_INET
%23 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i64 0, i32 2
store i32 %22, i32* %23
%24 = call i32 @htons(i32 %0)
%25 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i64 0, i32 1
store i32 %24, i32* %25
%26 = load i32, i32* @INADDR_ANY
%27 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i64 0, i32 0, i32 0
store i32 %26, i32* %27
%28 = bitcast %struct.sockaddr_in* %3 to %struct.sockaddr*
%29 = call i32 @bind(i32 %6, %struct.sockaddr* %28, i32 12)
%30 = icmp eq i32 %29, -1
br i1 %30, label %31, label %34
31: ; preds = %20
%32 = call i32 @perror(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.2, i64 0, i64 0))
%33 = call i32 @exit(i32 -1)
unreachable
34: ; preds = %20
%35 = call i32 @listen(i32 %6, i32 10)
%36 = icmp eq i32 %35, -1
br i1 %36, label %37, label %40
37: ; preds = %34
%38 = call i32 @perror(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.3, i64 0, i64 0))
%39 = call i32 @exit(i32 -1)
unreachable
40: ; preds = %34
ret i32 %6
}