#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 socklen_t;
typedef int /*<<< orphan*/ servaddr;
typedef int /*<<< orphan*/ cliaddr;

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int /*<<< orphan*/ INADDR_ANY;
int /*<<< orphan*/ SOCK_DGRAM;
int /*<<< orphan*/ bind(int, struct sockaddr *, int);
int /*<<< orphan*/ htonl(int /*<<< orphan*/);
int /*<<< orphan*/ htons(int);
int /*<<< orphan*/ printf(char *, char *);
int recvfrom(int, char *, int, int /*<<< orphan*/, struct sockaddr *, int *);
int /*<<< orphan*/ sendto(int, char *, int, int /*<<< orphan*/,
                          struct sockaddr *, int);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int main(int argc, char **argv) {
  int sockfd, n;
  struct sockaddr_in servaddr, cliaddr;
  socklen_t len;
  char mesg[1000];
  char *banner = "Hello UDP client! This is UDP server";
  sockfd = socket(AF_INET, SOCK_DGRAM, 0);
  servaddr.sin_family = AF_INET;
  servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
  servaddr.sin_port = htons(32000);
  bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
  len = sizeof(cliaddr);
  while (1) {
    n = recvfrom(sockfd, mesg, 1000, 0, (struct sockaddr *)&cliaddr, &len);
    sendto(sockfd, banner, n, 0, (struct sockaddr *)&cliaddr, sizeof(cliaddr));
    mesg[n] = 0;
    printf("Received: %s\n", mesg);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x440,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    0xe70(%rip),%rax
mov    %rax,-0x438(%rbp)
mov    0x2e4a(%rip),%rax
mov    (%rax),%edi
mov    0x2e31(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1090 <socket@plt>
mov    %eax,-0x14(%rbp)
mov    0x2e2e(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x20(%rbp)
mov    0x2e1a(%rip),%rax
mov    (%rax),%edi
call   1050 <htonl@plt>
mov    %eax,-0x24(%rbp)
mov    $0x7d00,%edi
call   1030 <htons@plt>
mov    %eax,-0x28(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x28(%rbp),%rsi
mov    $0xc,%edx
call   1080 <bind@plt>
movl   $0xc,-0x3c(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x430(%rbp),%rsi
lea    -0x38(%rbp),%r8
mov    $0x3e8,%edx
xor    %ecx,%ecx
lea    -0x3c(%rbp),%r9
call   1070 <recvfrom@plt>
mov    %eax,-0x18(%rbp)
mov    -0x14(%rbp),%edi
mov    -0x438(%rbp),%rsi
mov    -0x18(%rbp),%edx
lea    -0x38(%rbp),%r8
xor    %ecx,%ecx
mov    $0xc,%r9d
call   1060 <sendto@plt>
movslq -0x18(%rbp),%rax
movb   $0x0,-0x430(%rbp,%rax,1)
lea    -0x430(%rbp),%rsi
lea    0xdd7(%rip),%rdi
call   1040 <printf@plt>
jmp    11f5 <main+0x85>

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x418,%rsp
mov    0x2e60(%rip),%rbp
mov    0x0(%rbp),%edi
mov    0x2e46(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1090 <socket@plt>
mov    %eax,%ebx
mov    0x0(%rbp),%eax
mov    %eax,0x18(%rsp)
mov    0x2e35(%rip),%rax
mov    (%rax),%edi
call   1050 <htonl@plt>
mov    %eax,0x14(%rsp)
mov    $0x7d00,%edi
call   1030 <htons@plt>
mov    %eax,0x10(%rsp)
lea    0x10(%rsp),%rsi
mov    %ebx,%edi
mov    $0xc,%edx
call   1080 <bind@plt>
movl   $0xc,0xc(%rsp)
lea    0x30(%rsp),%r14
lea    0x20(%rsp),%r15
lea    0xe12(%rip),%r13
lea    0xe30(%rip),%rbp
cs nopw 0x0(%rax,%rax,1)
nop
mov    %ebx,%edi
mov    %r14,%rsi
mov    $0x3e8,%edx
xor    %ecx,%ecx
mov    %r15,%r8
lea    0xc(%rsp),%r9
call   1070 <recvfrom@plt>
mov    %eax,%r12d
mov    %ebx,%edi
mov    %r13,%rsi
mov    %eax,%edx
xor    %ecx,%ecx
mov    %r15,%r8
mov    $0xc,%r9d
call   1060 <sendto@plt>
movslq %r12d,%rax
movb   $0x0,0x30(%rsp,%rax,1)
mov    %rbp,%rdi
mov    %r14,%rsi
call   1040 <printf@plt>
jmp    1200 <main+0x90>

LLVM IR (-O0):
%struct.sockaddr_in = type { i32, %struct.TYPE_2__, i32 }
%struct.TYPE_2__ = type { i32 }
%struct.sockaddr = type { i32 }
@.str = [37 x i8] c"Hello UDP client! This is UDP server\00"
@AF_INET = global i32 0
@SOCK_DGRAM = global i32 0
@INADDR_ANY = global i32 0
@.str.1 = [14 x i8] c"Received: %s\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i32
%8 = alloca %struct.sockaddr_in
%9 = alloca %struct.sockaddr_in
%10 = alloca i32
%11 = alloca [1000 x i8]
%12 = alloca i8*
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i8* getelementptr inbounds ([37 x i8], [37 x i8]* @.str, i64 0, i64 0), i8** %12
%13 = load i32, i32* @AF_INET
%14 = load i32, i32* @SOCK_DGRAM
%15 = call i32 @socket(i32 %13, i32 %14, i32 0)
store i32 %15, i32* %6
%16 = load i32, i32* @AF_INET
%17 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %8, i32 0, i32 2
store i32 %16, i32* %17
%18 = load i32, i32* @INADDR_ANY
%19 = call i32 @htonl(i32 %18)
%20 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %8, i32 0, i32 1
%21 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %20, i32 0, i32 0
store i32 %19, i32* %21
%22 = call i32 @htons(i32 32000)
%23 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %8, i32 0, i32 0
store i32 %22, i32* %23
%24 = load i32, i32* %6
%25 = bitcast %struct.sockaddr_in* %8 to %struct.sockaddr*
%26 = call i32 @bind(i32 %24, %struct.sockaddr* %25, i32 12)
store i32 12, i32* %10
br label %27
27: ; preds = %2, %27
%28 = load i32, i32* %6
%29 = getelementptr inbounds [1000 x i8], [1000 x i8]* %11, i64 0, i64 0
%30 = bitcast %struct.sockaddr_in* %9 to %struct.sockaddr*
%31 = call i32 @recvfrom(i32 %28, i8* %29, i32 1000, i32 0, %struct.sockaddr* %30, i32* %10)
store i32 %31, i32* %7
%32 = load i32, i32* %6
%33 = load i8*, i8** %12
%34 = load i32, i32* %7
%35 = bitcast %struct.sockaddr_in* %9 to %struct.sockaddr*
%36 = call i32 @sendto(i32 %32, i8* %33, i32 %34, i32 0, %struct.sockaddr* %35, i32 12)
%37 = load i32, i32* %7
%38 = sext i32 %37 to i64
%39 = getelementptr inbounds [1000 x i8], [1000 x i8]* %11, i64 0, i64 %38
store i8 0, i8* %39
%40 = getelementptr inbounds [1000 x i8], [1000 x i8]* %11, i64 0, i64 0
%41 = call i32 @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i8* %40)
br label %27
}

LLVM IR (-O2):
%struct.sockaddr_in = type { i32, %struct.TYPE_2__, i32 }
%struct.TYPE_2__ = type { i32 }
%struct.sockaddr = type { i32 }
@.str = [37 x i8] c"Hello UDP client! This is UDP server\00"
@AF_INET = global i32 0
@SOCK_DGRAM = global i32 0
@INADDR_ANY = global i32 0
@.str.1 = [14 x i8] c"Received: %s\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca %struct.sockaddr_in
%4 = alloca %struct.sockaddr_in
%5 = alloca i32
%6 = alloca [1000 x i8]
%7 = bitcast %struct.sockaddr_in* %3 to i8*
%8 = bitcast %struct.sockaddr_in* %4 to i8*
%9 = bitcast i32* %5 to i8*
%10 = getelementptr inbounds [1000 x i8], [1000 x i8]* %6, i64 0, i64 0
%11 = load i32, i32* @AF_INET
%12 = load i32, i32* @SOCK_DGRAM
%13 = tail call i32 @socket(i32 %11, i32 %12, i32 0)
%14 = load i32, i32* @AF_INET
%15 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i64 0, i32 2
store i32 %14, i32* %15
%16 = load i32, i32* @INADDR_ANY
%17 = tail call i32 @htonl(i32 %16)
%18 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i64 0, i32 1, i32 0
store i32 %17, i32* %18
%19 = tail call i32 @htons(i32 32000)
%20 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i64 0, i32 0
store i32 %19, i32* %20
%21 = bitcast %struct.sockaddr_in* %3 to %struct.sockaddr*
%22 = call i32 @bind(i32 %13, %struct.sockaddr* %21, i32 12)
store i32 12, i32* %5
%23 = bitcast %struct.sockaddr_in* %4 to %struct.sockaddr*
br label %24
24: ; preds = %24, %2
%25 = call i32 @recvfrom(i32 %13, i8* %10, i32 1000, i32 0, %struct.sockaddr* %23, i32* %5)
%26 = call i32 @sendto(i32 %13, i8* getelementptr inbounds ([37 x i8], [37 x i8]* @.str, i64 0, i64 0), i32 %25, i32 0, %struct.sockaddr* %23, i32 12)
%27 = sext i32 %25 to i64
%28 = getelementptr inbounds [1000 x i8], [1000 x i8]* %6, i64 0, i64 %27
store i8 0, i8* %28
%29 = call i32 @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i8* %10)
br label %24
}