#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;
};

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int /*<<< orphan*/ EXIT_FAILURE;
int /*<<< orphan*/ INADDR_ANY;
int /*<<< orphan*/ IPPROTO_UDP;
int /*<<< orphan*/ SOCK_DGRAM;
scalar_t__ bind(int, struct sockaddr *, int);
int /*<<< orphan*/ exit(int /*<<< orphan*/);
int /*<<< orphan*/ htonl(int /*<<< orphan*/);
int /*<<< orphan*/ htons(int);
int /*<<< orphan*/ memset(struct sockaddr_in *, int /*<<< orphan*/, int);
int /*<<< orphan*/ perror(char *);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int open_udp(int port) {
  struct sockaddr_in sa;
  int sock;
  sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
  if (sock < 0) {
    perror("socket");
    exit(EXIT_FAILURE);
  }
  memset(&sa, 0, sizeof sa);
  sa.sin_family = AF_INET;
  sa.sin_port = htons(port);
  sa.sin_addr.s_addr = htonl(INADDR_ANY);
  if (bind(sock, (struct sockaddr *)&sa, sizeof sa) < 0) {
    perror("bind");
    exit(EXIT_FAILURE);
  }
  return sock;
}


x86 assembly (clang, -O0):
<open_udp>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x4(%rbp)
mov    0x2e66(%rip),%rax
mov    (%rax),%edi
mov    0x2e4d(%rip),%rax
mov    (%rax),%esi
mov    0x2e24(%rip),%rax
mov    (%rax),%edx
call   1090 <socket@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    11c2 <open_udp+0x52>
lea    0xe51(%rip),%rdi
call   1070 <perror@plt>
mov    0x2e0d(%rip),%rax
mov    (%rax),%edi
call   1080 <exit@plt>
lea    -0x10(%rbp),%rdi
xor    %esi,%esi
mov    $0xc,%edx
call   1050 <memset@plt>
mov    0x2e0f(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x8(%rbp)
mov    -0x4(%rbp),%edi
call   1030 <htons@plt>
mov    %eax,-0xc(%rbp)
mov    0x2df0(%rip),%rax
mov    (%rax),%edi
call   1040 <htonl@plt>
mov    %eax,-0x10(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x10(%rbp),%rsi
mov    $0xc,%edx
call   1060 <bind@plt>
cmp    $0x0,%rax
jge    122f <open_udp+0xbf>
lea    0xdeb(%rip),%rdi
call   1070 <perror@plt>
mov    0x2da0(%rip),%rax
mov    (%rax),%edi
call   1080 <exit@plt>
mov    -0x14(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<open_udp>:
push   %rbp
push   %r15
push   %r14
push   %rbx
sub    $0x18,%rsp
mov    %edi,%ebp
mov    0x2e65(%rip),%r15
mov    (%r15),%edi
mov    0x2e4b(%rip),%rax
mov    (%rax),%esi
mov    0x2e22(%rip),%rax
mov    (%rax),%edx
call   1090 <socket@plt>
test   %eax,%eax
js     11fc <open_udp+0x8c>
mov    %eax,%ebx
lea    0x8(%rsp),%r14
mov    %r14,%rdi
xor    %esi,%esi
mov    $0xc,%edx
call   1050 <memset@plt>
mov    (%r15),%eax
mov    %eax,0x10(%rsp)
mov    %ebp,%edi
call   1030 <htons@plt>
mov    %eax,0xc(%rsp)
mov    0x2e10(%rip),%rax
mov    (%rax),%edi
call   1040 <htonl@plt>
mov    %eax,0x8(%rsp)
mov    %ebx,%edi
mov    %r14,%rsi
mov    $0xc,%edx
call   1060 <bind@plt>
test   %rax,%rax
js     1205 <open_udp+0x95>
mov    %ebx,%eax
add    $0x18,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret
lea    0xdfd(%rip),%rdi
jmp    120c <open_udp+0x9c>
lea    0xdfb(%rip),%rdi
call   1070 <perror@plt>
mov    0x2db0(%rip),%rax
mov    (%rax),%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_DGRAM = global i32 0
@IPPROTO_UDP = global i32 0
@.str = [7 x i8] c"socket\00"
@EXIT_FAILURE = global i32 0
@INADDR_ANY = global i32 0
@.str.1 = [5 x i8] c"bind\00"
define i32 @open_udp(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_DGRAM
%7 = load i32, i32* @IPPROTO_UDP
%8 = call i32 @socket(i32 %5, i32 %6, i32 %7)
store i32 %8, i32* %4
%9 = load i32, i32* %4
%10 = icmp slt i32 %9, 0
br i1 %10, label %11, label %15
11: ; preds = %1
%12 = call i32 @perror(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%13 = load i32, i32* @EXIT_FAILURE
%14 = call i32 @exit(i32 %13)
unreachable
15: ; preds = %1
%16 = call i32 @memset(%struct.sockaddr_in* %3, i32 0, i32 12)
%17 = load i32, i32* @AF_INET
%18 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i32 0, i32 2
store i32 %17, i32* %18
%19 = load i32, i32* %2
%20 = call i32 @htons(i32 %19)
%21 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i32 0, i32 1
store i32 %20, i32* %21
%22 = load i32, i32* @INADDR_ANY
%23 = call i32 @htonl(i32 %22)
%24 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i32 0, i32 0
%25 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %24, i32 0, i32 0
store i32 %23, i32* %25
%26 = load i32, i32* %4
%27 = bitcast %struct.sockaddr_in* %3 to %struct.sockaddr*
%28 = call i64 @bind(i32 %26, %struct.sockaddr* %27, i32 12)
%29 = icmp slt i64 %28, 0
br i1 %29, label %30, label %34
30: ; preds = %15
%31 = call i32 @perror(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0))
%32 = load i32, i32* @EXIT_FAILURE
%33 = call i32 @exit(i32 %32)
unreachable
34: ; preds = %15
%35 = load i32, i32* %4
ret i32 %35
}

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