#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 */

/* Type definitions */
struct sockaddr_in {
  int /*<<< orphan*/ sin_addr;
  int /*<<< orphan*/ sin_port;
  int /*<<< orphan*/ sin_family;
};
struct sockaddr {
  int dummy;
};
struct hostent {
  int /*<<< orphan*/ h_length;
  scalar_t__ h_addr;
};

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int /*<<< orphan*/ SOCK_DGRAM;
int /*<<< orphan*/ atoi(char *);
int /*<<< orphan*/ bcopy(char *, char *, int /*<<< orphan*/);
int /*<<< orphan*/ bzero(char *, int);
int /*<<< orphan*/ close(int);
int /*<<< orphan*/ error(char *);
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ fgets(char *, int, int /*<<< orphan*/);
struct hostent *gethostbyname(char *);
int /*<<< orphan*/ htons(int /*<<< orphan*/);
char *inet_ntoa(int /*<<< orphan*/);
int /*<<< orphan*/ printf(char *);
int recvfrom(int, char *, int, int /*<<< orphan*/, struct sockaddr *,
             unsigned int *);
int sendto(int, char *, int /*<<< orphan*/, int /*<<< orphan*/,
           struct sockaddr const *, unsigned int);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int /*<<< orphan*/ stdin;
int /*<<< orphan*/ strlen(char *);
int /*<<< orphan*/ write(int, char *, int);
int main(int argc, char *argv[]) {
  int sock, n;
  unsigned int length;
  struct sockaddr_in server, from;
  struct hostent *hp;
  char buffer[256];
  if (argc != 3) {
    printf("Usage: server port\n");
    exit(1);
  }
  sock = socket(AF_INET, SOCK_DGRAM, 0);
  if (sock < 0)
    error("socket");
  server.sin_family = AF_INET;
  hp = gethostbyname(argv[1]);
  if (hp == 0)
    error("Unknown host");
  bcopy((char *)hp->h_addr, (char *)&server.sin_addr, hp->h_length);
  server.sin_port = htons(atoi(argv[2]));
  length = sizeof(struct sockaddr_in);
  printf("Please enter the message: ");
  bzero(buffer, 256);
  fgets(buffer, 255, stdin);
  n = sendto(sock, buffer, strlen(buffer), 0, (const struct sockaddr *)&server,
             length);
  if (n < 0)
    error("Sendto");
  n = recvfrom(sock, buffer, 256, 0, (struct sockaddr *)&from, &length);
  if (n < 0)
    error("recvfrom");
  write(1, "Got an ack: ", 12);
  write(1, buffer, n);
  char *sdpCIP;
  sdpCIP = inet_ntoa(from.sin_addr);
  close(sock);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x160,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x3,-0x8(%rbp)
je     1239 <main+0x39>
lea    0xdd6(%rip),%rdi
call   1070 <printf@plt>
mov    $0x1,%edi
call   1110 <exit@plt>
mov    0x2da8(%rip),%rax
mov    (%rax),%edi
mov    0x2d8f(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1120 <socket@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    126b <main+0x6b>
lea    0xdae(%rip),%rdi
call   10e0 <error@plt>
mov    0x2d76(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x20(%rbp)
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   10b0 <gethostbyname@plt>
mov    %rax,-0x40(%rbp)
cmpq   $0x0,-0x40(%rbp)
jne    129f <main+0x9f>
lea    0xd81(%rip),%rdi
call   10e0 <error@plt>
mov    -0x40(%rbp),%rax
mov    0x8(%rax),%rdi
lea    -0x28(%rbp),%rsi
mov    -0x40(%rbp),%rax
mov    (%rax),%edx
call   10d0 <bcopy@plt>
mov    -0x10(%rbp),%rax
mov    0x10(%rax),%rdi
call   1100 <atoi@plt>
mov    %eax,%edi
call   1060 <htons@plt>
mov    %eax,-0x24(%rbp)
movl   $0xc,-0x1c(%rbp)
lea    0xd4d(%rip),%rdi
call   1070 <printf@plt>
lea    -0x140(%rbp),%rdi
mov    $0x100,%esi
call   10f0 <bzero@plt>
lea    -0x140(%rbp),%rdi
mov    0x2ce1(%rip),%rax
mov    (%rax),%edx
mov    $0xff,%esi
call   10a0 <fgets@plt>
mov    -0x14(%rbp),%eax
mov    %eax,-0x154(%rbp)
lea    -0x140(%rbp),%rax
mov    %rax,-0x150(%rbp)
lea    -0x140(%rbp),%rdi
call   1050 <strlen@plt>
mov    -0x154(%rbp),%edi
mov    -0x150(%rbp),%rsi
mov    %eax,%edx
lea    -0x28(%rbp),%r8
mov    -0x1c(%rbp),%r9d
xor    %ecx,%ecx
call   1080 <sendto@plt>
mov    %eax,-0x18(%rbp)
cmpl   $0x0,-0x18(%rbp)
jge    1365 <main+0x165>
lea    0xce3(%rip),%rdi
call   10e0 <error@plt>
mov    -0x14(%rbp),%edi
lea    -0x140(%rbp),%rsi
lea    -0x38(%rbp),%r8
mov    $0x100,%edx
xor    %ecx,%ecx
lea    -0x1c(%rbp),%r9
call   10c0 <recvfrom@plt>
mov    %eax,-0x18(%rbp)
cmpl   $0x0,-0x18(%rbp)
jge    139c <main+0x19c>
lea    0xcb3(%rip),%rdi
call   10e0 <error@plt>
mov    $0x1,%edi
lea    0xcab(%rip),%rsi
mov    $0xc,%edx
call   1030 <write@plt>
lea    -0x140(%rbp),%rsi
mov    -0x18(%rbp),%edx
mov    $0x1,%edi
call   1030 <write@plt>
mov    -0x38(%rbp),%edi
call   1040 <inet_ntoa@plt>
mov    %rax,-0x148(%rbp)
mov    -0x14(%rbp),%edi
call   1090 <close@plt>
xor    %eax,%eax
add    $0x160,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %rbx
sub    $0x138,%rsp
cmp    $0x3,%edi
jne    1386 <main+0x176>
mov    %rsi,%rbx
mov    0x2db8(%rip),%rbp
mov    0x0(%rbp),%edi
mov    0x2d9e(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1130 <socket@plt>
mov    %eax,%r15d
test   %eax,%eax
jns    1256 <main+0x46>
lea    0xdaf(%rip),%rdi
call   10f0 <error@plt>
mov    0x0(%rbp),%eax
mov    %eax,0x18(%rsp)
mov    0x8(%rbx),%rdi
call   10c0 <gethostbyname@plt>
mov    %rax,%rbp
test   %rax,%rax
jne    127a <main+0x6a>
lea    0xd92(%rip),%rdi
call   10f0 <error@plt>
mov    0x8(%rbp),%rsi
mov    0x0(%rbp),%edx
lea    0x10(%rsp),%r14
mov    %r14,%rdi
call   10e0 <memmove@plt>
mov    0x10(%rbx),%rdi
call   1110 <atoi@plt>
mov    %eax,%edi
call   1070 <htons@plt>
mov    %eax,0x14(%rsp)
movl   $0xc,0xc(%rsp)
lea    0xd63(%rip),%rdi
call   1080 <printf@plt>
lea    0x30(%rsp),%rbx
mov    %rbx,%rdi
mov    $0x100,%esi
call   1100 <bzero@plt>
mov    0x2d11(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
mov    $0xff,%esi
call   10b0 <fgets@plt>
mov    %rbx,%rdi
call   1060 <strlen@plt>
mov    %r15d,%edi
mov    %rbx,%rsi
mov    %eax,%edx
xor    %ecx,%ecx
mov    %r14,%r8
mov    $0xc,%r9d
call   1090 <sendto@plt>
test   %eax,%eax
jns    130e <main+0xfe>
lea    0xd26(%rip),%rdi
call   10f0 <error@plt>
lea    0x30(%rsp),%rsi
lea    0x20(%rsp),%r8
lea    0xc(%rsp),%r9
mov    %r15d,%edi
mov    $0x100,%edx
xor    %ecx,%ecx
call   10d0 <recvfrom@plt>
mov    %eax,%ebx
test   %eax,%eax
jns    133e <main+0x12e>
lea    0xcfd(%rip),%rdi
call   10f0 <error@plt>
lea    0xcfa(%rip),%rsi
mov    $0x1,%edi
mov    $0xc,%edx
call   1040 <write@plt>
lea    0x30(%rsp),%rsi
mov    $0x1,%edi
mov    %ebx,%edx
call   1040 <write@plt>
mov    0x20(%rsp),%edi
call   1050 <inet_ntoa@plt>
mov    %r15d,%edi
call   10a0 <close@plt>
xor    %eax,%eax
add    $0x138,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret
lea    0xcbf(%rip),%rdi
call   1030 <puts@plt>
mov    $0x1,%edi
call   1120 <exit@plt>

LLVM IR (-O0):
%struct.sockaddr_in = type { i32, i32, i32 }
%struct.hostent = type { i32, i64 }
%struct.sockaddr = type { i32 }
@.str = [20 x i8] c"Usage: server port\0A\00"
@AF_INET = global i32 0
@SOCK_DGRAM = global i32 0
@.str.1 = [7 x i8] c"socket\00"
@.str.2 = [13 x i8] c"Unknown host\00"
@.str.3 = [27 x i8] c"Please enter the message: \00"
@stdin = global i32 0
@.str.4 = [7 x i8] c"Sendto\00"
@.str.5 = [9 x i8] c"recvfrom\00"
@.str.6 = [13 x i8] c"Got an ack: \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 i32
%9 = alloca %struct.sockaddr_in
%10 = alloca %struct.sockaddr_in
%11 = alloca %struct.hostent*
%12 = alloca [256 x i8]
%13 = alloca i8*
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%14 = load i32, i32* %4
%15 = icmp ne i32 %14, 3
br i1 %15, label %16, label %19
16: ; preds = %2
%17 = call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0))
%18 = call i32 @exit(i32 1)
unreachable
19: ; preds = %2
%20 = load i32, i32* @AF_INET
%21 = load i32, i32* @SOCK_DGRAM
%22 = call i32 @socket(i32 %20, i32 %21, i32 0)
store i32 %22, i32* %6
%23 = load i32, i32* %6
%24 = icmp slt i32 %23, 0
br i1 %24, label %25, label %27
25: ; preds = %19
%26 = call i32 @error(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0))
br label %27
27: ; preds = %25, %19
%28 = load i32, i32* @AF_INET
%29 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %9, i32 0, i32 2
store i32 %28, i32* %29
%30 = load i8**, i8*** %5
%31 = getelementptr inbounds i8*, i8** %30, i64 1
%32 = load i8*, i8** %31
%33 = call %struct.hostent* @gethostbyname(i8* %32)
store %struct.hostent* %33, %struct.hostent** %11
%34 = load %struct.hostent*, %struct.hostent** %11
%35 = icmp eq %struct.hostent* %34, null
br i1 %35, label %36, label %38
36: ; preds = %27
%37 = call i32 @error(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0))
br label %38
38: ; preds = %36, %27
%39 = load %struct.hostent*, %struct.hostent** %11
%40 = getelementptr inbounds %struct.hostent, %struct.hostent* %39, i32 0, i32 1
%41 = load i64, i64* %40
%42 = inttoptr i64 %41 to i8*
%43 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %9, i32 0, i32 0
%44 = bitcast i32* %43 to i8*
%45 = load %struct.hostent*, %struct.hostent** %11
%46 = getelementptr inbounds %struct.hostent, %struct.hostent* %45, i32 0, i32 0
%47 = load i32, i32* %46
%48 = call i32 @bcopy(i8* %42, i8* %44, i32 %47)
%49 = load i8**, i8*** %5
%50 = getelementptr inbounds i8*, i8** %49, i64 2
%51 = load i8*, i8** %50
%52 = call i32 @atoi(i8* %51)
%53 = call i32 @htons(i32 %52)
%54 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %9, i32 0, i32 1
store i32 %53, i32* %54
store i32 12, i32* %8
%55 = call i32 @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.3, i64 0, i64 0))
%56 = getelementptr inbounds [256 x i8], [256 x i8]* %12, i64 0, i64 0
%57 = call i32 @bzero(i8* %56, i32 256)
%58 = getelementptr inbounds [256 x i8], [256 x i8]* %12, i64 0, i64 0
%59 = load i32, i32* @stdin
%60 = call i32 @fgets(i8* %58, i32 255, i32 %59)
%61 = load i32, i32* %6
%62 = getelementptr inbounds [256 x i8], [256 x i8]* %12, i64 0, i64 0
%63 = getelementptr inbounds [256 x i8], [256 x i8]* %12, i64 0, i64 0
%64 = call i32 @strlen(i8* %63)
%65 = bitcast %struct.sockaddr_in* %9 to %struct.sockaddr*
%66 = load i32, i32* %8
%67 = call i32 @sendto(i32 %61, i8* %62, i32 %64, i32 0, %struct.sockaddr* %65, i32 %66)
store i32 %67, i32* %7
%68 = load i32, i32* %7
%69 = icmp slt i32 %68, 0
br i1 %69, label %70, label %72
70: ; preds = %38
%71 = call i32 @error(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.4, i64 0, i64 0))
br label %72
72: ; preds = %70, %38
%73 = load i32, i32* %6
%74 = getelementptr inbounds [256 x i8], [256 x i8]* %12, i64 0, i64 0
%75 = bitcast %struct.sockaddr_in* %10 to %struct.sockaddr*
%76 = call i32 @recvfrom(i32 %73, i8* %74, i32 256, i32 0, %struct.sockaddr* %75, i32* %8)
store i32 %76, i32* %7
%77 = load i32, i32* %7
%78 = icmp slt i32 %77, 0
br i1 %78, label %79, label %81
79: ; preds = %72
%80 = call i32 @error(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.5, i64 0, i64 0))
br label %81
81: ; preds = %79, %72
%82 = call i32 @write(i32 1, i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.6, i64 0, i64 0), i32 12)
%83 = getelementptr inbounds [256 x i8], [256 x i8]* %12, i64 0, i64 0
%84 = load i32, i32* %7
%85 = call i32 @write(i32 1, i8* %83, i32 %84)
%86 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %10, i32 0, i32 0
%87 = load i32, i32* %86
%88 = call i8* @inet_ntoa(i32 %87)
store i8* %88, i8** %13
%89 = load i32, i32* %6
%90 = call i32 @close(i32 %89)
ret i32 0
}

LLVM IR (-O2):
%struct.sockaddr_in = type { i32, i32, i32 }
%struct.hostent = type { i32, i64 }
%struct.sockaddr = type { i32 }
@AF_INET = global i32 0
@SOCK_DGRAM = global i32 0
@.str.1 = [7 x i8] c"socket\00"
@.str.2 = [13 x i8] c"Unknown host\00"
@.str.3 = [27 x i8] c"Please enter the message: \00"
@stdin = global i32 0
@.str.4 = [7 x i8] c"Sendto\00"
@.str.5 = [9 x i8] c"recvfrom\00"
@.str.6 = [13 x i8] c"Got an ack: \00"
@str = [19 x i8] c"Usage: server port\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = alloca i32
%4 = alloca %struct.sockaddr_in
%5 = alloca %struct.sockaddr_in
%6 = alloca [256 x i8]
%7 = bitcast i32* %3 to i8*
%8 = bitcast %struct.sockaddr_in* %4 to i8*
%9 = bitcast %struct.sockaddr_in* %5 to i8*
%10 = getelementptr inbounds [256 x i8], [256 x i8]* %6, i64 0, i64 0
%11 = icmp eq i32 %0, 3
br i1 %11, label %15, label %12
12: ; preds = %2
%13 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @str, i64 0, i64 0))
%14 = tail call i32 @exit(i32 1)
unreachable
15: ; preds = %2
%16 = load i32, i32* @AF_INET
%17 = load i32, i32* @SOCK_DGRAM
%18 = tail call i32 @socket(i32 %16, i32 %17, i32 0)
%19 = icmp slt i32 %18, 0
br i1 %19, label %20, label %22
20: ; preds = %15
%21 = tail call i32 @error(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0))
br label %22
22: ; preds = %20, %15
%23 = load i32, i32* @AF_INET
%24 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %4, i64 0, i32 2
store i32 %23, i32* %24
%25 = getelementptr inbounds i8*, i8** %1, i64 1
%26 = load i8*, i8** %25
%27 = tail call %struct.hostent* @gethostbyname(i8* %26)
%28 = icmp eq %struct.hostent* %27, null
br i1 %28, label %29, label %31
29: ; preds = %22
%30 = tail call i32 @error(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0))
br label %31
31: ; preds = %29, %22
%32 = getelementptr inbounds %struct.hostent, %struct.hostent* %27, i64 0, i32 1
%33 = load i64, i64* %32
%34 = inttoptr i64 %33 to i8*
%35 = getelementptr inbounds %struct.hostent, %struct.hostent* %27, i64 0, i32 0
%36 = load i32, i32* %35
%37 = getelementptr inbounds i8*, i8** %1, i64 2
%38 = load i8*, i8** %37
%39 = tail call i32 @atoi(i8* %38)
%40 = tail call i32 @htons(i32 %39)
%41 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %4, i64 0, i32 1
store i32 %40, i32* %41
store i32 12, i32* %3
%42 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([27 x i8], [27 x i8]* @.str.3, i64 0, i64 0))
%43 = call i32 @bzero(i8* %10, i32 256)
%44 = load i32, i32* @stdin
%45 = call i32 @fgets(i8* %10, i32 255, i32 %44)
%46 = call i32 @strlen(i8* %10)
%47 = bitcast %struct.sockaddr_in* %4 to %struct.sockaddr*
%48 = call i32 @sendto(i32 %18, i8* %10, i32 %46, i32 0, %struct.sockaddr* %47, i32 12)
%49 = icmp slt i32 %48, 0
br i1 %49, label %50, label %52
50: ; preds = %31
%51 = call i32 @error(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.4, i64 0, i64 0))
br label %52
52: ; preds = %50, %31
%53 = bitcast %struct.sockaddr_in* %5 to %struct.sockaddr*
%54 = call i32 @recvfrom(i32 %18, i8* %10, i32 256, i32 0, %struct.sockaddr* %53, i32* %3)
%55 = icmp slt i32 %54, 0
br i1 %55, label %56, label %58
56: ; preds = %52
%57 = call i32 @error(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.5, i64 0, i64 0))
br label %58
58: ; preds = %56, %52
%59 = call i32 @write(i32 1, i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.6, i64 0, i64 0), i32 12)
%60 = call i32 @write(i32 1, i8* %10, i32 %54)
%61 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i64 0, i32 0
%62 = load i32, i32* %61
%63 = call i8* @inet_ntoa(i32 %62)
%64 = call i32 @close(i32 %18)
ret i32 0
}