#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*/ serv_addr;
typedef int /*<<< orphan*/ cli_addr;

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int /*<<< orphan*/ INADDR_ANY;
int /*<<< orphan*/ SOCK_STREAM;
int accept(int, struct sockaddr *, int *);
scalar_t__ bind(int, struct sockaddr *, int);
int /*<<< orphan*/ bzero(char *, int);
int /*<<< orphan*/ close(int);
int /*<<< orphan*/ error(char *);
int /*<<< orphan*/ htons(int);
int /*<<< orphan*/ listen(int, int);
int /*<<< orphan*/ printf(char *, ...);
int read(int, char *, int);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int write(int, char *, int);
int main(int argc, char *argv[]) {
  int sockfd, newsockfd;
  socklen_t clilen;
  int portnum = 12321;
  char buffer[256];
  struct sockaddr_in serv_addr, cli_addr;
  int n, m;
  sockfd = socket(AF_INET, SOCK_STREAM, 0);
  if (sockfd < 0)
    error("ERROR opening socket");
  bzero((char *)&serv_addr, sizeof(serv_addr));
  serv_addr.sin_family = AF_INET;
  serv_addr.sin_addr.s_addr = INADDR_ANY;
  serv_addr.sin_port = htons(portnum);
  if (bind(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
    error("ERROR on binding");
  listen(sockfd, 5);
  clilen = sizeof(cli_addr);
  newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr, &clilen);
  if (newsockfd < 0)
    error("ERROR on accept");
  do {
    bzero(buffer, 256);
    n = read(newsockfd, buffer, 255);
    if (n < 0) {
      error("ERROR reading from socket");
    }
    m = write(newsockfd, "I got your message", 18);
    printf("%s\n", buffer);
  } while (n != 0);
  m = write(newsockfd, "", 0);
  printf("closing sockets...");
  close(newsockfd);
  close(sockfd);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x150,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
movl   $0x3021,-0x20(%rbp)
mov    0x2e11(%rip),%rax
mov    (%rax),%edi
mov    0x2df0(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   10d0 <socket@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    1202 <main+0x52>
lea    0xe03(%rip),%rdi
call   10a0 <error@plt>
lea    -0x130(%rbp),%rdi
mov    $0xc,%esi
call   10b0 <bzero@plt>
mov    0x2dce(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x128(%rbp)
mov    0x2db7(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x12c(%rbp)
mov    -0x20(%rbp),%edi
call   1040 <htons@plt>
mov    %eax,-0x130(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x130(%rbp),%rsi
mov    $0xc,%edx
call   1090 <bind@plt>
cmp    $0x0,%rax
jge    1269 <main+0xb9>
lea    0xdb1(%rip),%rdi
call   10a0 <error@plt>
mov    -0x14(%rbp),%edi
mov    $0x5,%esi
call   1080 <listen@plt>
movl   $0xc,-0x1c(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x140(%rbp),%rsi
lea    -0x1c(%rbp),%rdx
call   10c0 <accept@plt>
mov    %eax,-0x18(%rbp)
cmpl   $0x0,-0x18(%rbp)
jge    12a9 <main+0xf9>
lea    0xd82(%rip),%rdi
call   10a0 <error@plt>
jmp    12ae <main+0xfe>
lea    -0x120(%rbp),%rdi
mov    $0x100,%esi
call   10b0 <bzero@plt>
mov    -0x18(%rbp),%edi
lea    -0x120(%rbp),%rsi
mov    $0xff,%edx
call   1070 <read@plt>
mov    %eax,-0x144(%rbp)
cmpl   $0x0,-0x144(%rbp)
jge    12f2 <main+0x142>
lea    0xd49(%rip),%rdi
call   10a0 <error@plt>
mov    -0x18(%rbp),%edi
lea    0xd54(%rip),%rsi
mov    $0x12,%edx
call   1030 <write@plt>
mov    %eax,-0x148(%rbp)
lea    -0x120(%rbp),%rsi
lea    0xd49(%rip),%rdi
mov    $0x0,%al
call   1050 <printf@plt>
cmpl   $0x0,-0x144(%rbp)
jne    12ae <main+0xfe>
mov    -0x18(%rbp),%edi
lea    0xd2e(%rip),%rsi
xor    %edx,%edx
call   1030 <write@plt>
mov    %eax,-0x148(%rbp)
lea    0xd1b(%rip),%rdi
mov    $0x0,%al
call   1050 <printf@plt>
mov    -0x18(%rbp),%edi
call   1060 <close@plt>
mov    -0x14(%rbp),%edi
call   1060 <close@plt>
xor    %eax,%eax
add    $0x150,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x138,%rsp
mov    0x2e10(%rip),%rbp
mov    0x0(%rbp),%edi
mov    0x2dee(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   10e0 <socket@plt>
mov    %eax,%r14d
test   %eax,%eax
jns    11fe <main+0x3e>
lea    0xe07(%rip),%rdi
call   10b0 <error@plt>
lea    0x10(%rsp),%rbx
mov    %rbx,%rdi
mov    $0xc,%esi
call   10c0 <bzero@plt>
mov    0x0(%rbp),%eax
mov    %eax,0x18(%rsp)
mov    0x2dc2(%rip),%rax
mov    (%rax),%eax
mov    %eax,0x14(%rsp)
mov    $0x3021,%edi
call   1050 <htons@plt>
mov    %eax,0x10(%rsp)
mov    %r14d,%edi
mov    %rbx,%rsi
mov    $0xc,%edx
call   10a0 <bind@plt>
test   %rax,%rax
jns    1253 <main+0x93>
lea    0xdc7(%rip),%rdi
call   10b0 <error@plt>
mov    %r14d,%edi
mov    $0x5,%esi
call   1090 <listen@plt>
movl   $0xc,0xc(%rsp)
lea    0x20(%rsp),%rsi
lea    0xc(%rsp),%rdx
mov    %r14d,%edi
call   10d0 <accept@plt>
mov    %eax,%r13d
test   %eax,%eax
jns    128d <main+0xcd>
lea    0xd9e(%rip),%rdi
call   10b0 <error@plt>
lea    0x30(%rsp),%rbx
lea    0xd9d(%rip),%r15
lea    0xdb0(%rip),%r12
jmp    12cc <main+0x10c>
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax)
mov    %r13d,%edi
mov    %r12,%rsi
mov    $0x12,%edx
call   1040 <write@plt>
mov    %rbx,%rdi
call   1030 <puts@plt>
test   %ebp,%ebp
je     12f9 <main+0x139>
mov    %rbx,%rdi
mov    $0x100,%esi
call   10c0 <bzero@plt>
mov    %r13d,%edi
mov    %rbx,%rsi
mov    $0xff,%edx
call   1080 <read@plt>
mov    %eax,%ebp
test   %eax,%eax
jns    12b0 <main+0xf0>
mov    %r15,%rdi
call   10b0 <error@plt>
jmp    12b0 <main+0xf0>
lea    0xd75(%rip),%rsi
mov    %r13d,%edi
xor    %edx,%edx
call   1040 <write@plt>
lea    0xd52(%rip),%rdi
xor    %eax,%eax
call   1060 <printf@plt>
mov    %r13d,%edi
call   1070 <close@plt>
mov    %r14d,%edi
call   1070 <close@plt>
xor    %eax,%eax
add    $0x138,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret

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 = [21 x i8] c"ERROR opening socket\00"
@INADDR_ANY = global i32 0
@.str.1 = [17 x i8] c"ERROR on binding\00"
@.str.2 = [16 x i8] c"ERROR on accept\00"
@.str.3 = [26 x i8] c"ERROR reading from socket\00"
@.str.4 = [19 x i8] c"I got your message\00"
@.str.5 = [4 x i8] c"%s\0A\00"
@.str.6 = [1 x i8] zeroinitializer
@.str.7 = [19 x i8] c"closing sockets...\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 i32
%10 = alloca [256 x i8]
%11 = alloca %struct.sockaddr_in
%12 = alloca %struct.sockaddr_in
%13 = alloca i32
%14 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i32 12321, i32* %9
%15 = load i32, i32* @AF_INET
%16 = load i32, i32* @SOCK_STREAM
%17 = call i32 @socket(i32 %15, i32 %16, i32 0)
store i32 %17, i32* %6
%18 = load i32, i32* %6
%19 = icmp slt i32 %18, 0
br i1 %19, label %20, label %22
20: ; preds = %2
%21 = call i32 @error(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0))
br label %22
22: ; preds = %20, %2
%23 = bitcast %struct.sockaddr_in* %11 to i8*
%24 = call i32 @bzero(i8* %23, i32 12)
%25 = load i32, i32* @AF_INET
%26 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %11, i32 0, i32 2
store i32 %25, i32* %26
%27 = load i32, i32* @INADDR_ANY
%28 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %11, i32 0, i32 1
%29 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %28, i32 0, i32 0
store i32 %27, i32* %29
%30 = load i32, i32* %9
%31 = call i32 @htons(i32 %30)
%32 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %11, i32 0, i32 0
store i32 %31, i32* %32
%33 = load i32, i32* %6
%34 = bitcast %struct.sockaddr_in* %11 to %struct.sockaddr*
%35 = call i64 @bind(i32 %33, %struct.sockaddr* %34, i32 12)
%36 = icmp slt i64 %35, 0
br i1 %36, label %37, label %39
37: ; preds = %22
%38 = call i32 @error(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.1, i64 0, i64 0))
br label %39
39: ; preds = %37, %22
%40 = load i32, i32* %6
%41 = call i32 @listen(i32 %40, i32 5)
store i32 12, i32* %8
%42 = load i32, i32* %6
%43 = bitcast %struct.sockaddr_in* %12 to %struct.sockaddr*
%44 = call i32 @accept(i32 %42, %struct.sockaddr* %43, i32* %8)
store i32 %44, i32* %7
%45 = load i32, i32* %7
%46 = icmp slt i32 %45, 0
br i1 %46, label %47, label %49
47: ; preds = %39
%48 = call i32 @error(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.2, i64 0, i64 0))
br label %49
49: ; preds = %47, %39
br label %50
50: ; preds = %65, %49
%51 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%52 = call i32 @bzero(i8* %51, i32 256)
%53 = load i32, i32* %7
%54 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%55 = call i32 @read(i32 %53, i8* %54, i32 255)
store i32 %55, i32* %13
%56 = load i32, i32* %13
%57 = icmp slt i32 %56, 0
br i1 %57, label %58, label %60
58: ; preds = %50
%59 = call i32 @error(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.3, i64 0, i64 0))
br label %60
60: ; preds = %58, %50
%61 = load i32, i32* %7
%62 = call i32 @write(i32 %61, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i32 18)
store i32 %62, i32* %14
%63 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%64 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), i8* %63)
br label %65
65: ; preds = %60
%66 = load i32, i32* %13
%67 = icmp ne i32 %66, 0
br i1 %67, label %50, label %68
68: ; preds = %65
%69 = load i32, i32* %7
%70 = call i32 @write(i32 %69, i8* getelementptr inbounds ([1 x i8], [1 x i8]* @.str.6, i64 0, i64 0), i32 0)
store i32 %70, i32* %14
%71 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.7, i64 0, i64 0))
%72 = load i32, i32* %7
%73 = call i32 @close(i32 %72)
%74 = load i32, i32* %6
%75 = call i32 @close(i32 %74)
ret i32 0
}

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 = [21 x i8] c"ERROR opening socket\00"
@INADDR_ANY = global i32 0
@.str.1 = [17 x i8] c"ERROR on binding\00"
@.str.2 = [16 x i8] c"ERROR on accept\00"
@.str.3 = [26 x i8] c"ERROR reading from socket\00"
@.str.4 = [19 x i8] c"I got your message\00"
@.str.6 = [1 x i8] zeroinitializer
@.str.7 = [19 x i8] c"closing sockets...\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca i32
%4 = alloca [256 x i8]
%5 = alloca %struct.sockaddr_in
%6 = alloca %struct.sockaddr_in
%7 = bitcast i32* %3 to i8*
%8 = getelementptr inbounds [256 x i8], [256 x i8]* %4, i64 0, i64 0
%9 = bitcast %struct.sockaddr_in* %5 to i8*
%10 = bitcast %struct.sockaddr_in* %6 to i8*
%11 = load i32, i32* @AF_INET
%12 = load i32, i32* @SOCK_STREAM
%13 = tail call i32 @socket(i32 %11, i32 %12, i32 0)
%14 = icmp slt i32 %13, 0
br i1 %14, label %15, label %17
15: ; preds = %2
%16 = tail call i32 @error(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0))
br label %17
17: ; preds = %15, %2
%18 = call i32 @bzero(i8* %9, i32 12)
%19 = load i32, i32* @AF_INET
%20 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i64 0, i32 2
store i32 %19, i32* %20
%21 = load i32, i32* @INADDR_ANY
%22 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i64 0, i32 1, i32 0
store i32 %21, i32* %22
%23 = tail call i32 @htons(i32 12321)
%24 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i64 0, i32 0
store i32 %23, i32* %24
%25 = bitcast %struct.sockaddr_in* %5 to %struct.sockaddr*
%26 = call i64 @bind(i32 %13, %struct.sockaddr* %25, i32 12)
%27 = icmp slt i64 %26, 0
br i1 %27, label %28, label %30
28: ; preds = %17
%29 = call i32 @error(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.1, i64 0, i64 0))
br label %30
30: ; preds = %28, %17
%31 = call i32 @listen(i32 %13, i32 5)
store i32 12, i32* %3
%32 = bitcast %struct.sockaddr_in* %6 to %struct.sockaddr*
%33 = call i32 @accept(i32 %13, %struct.sockaddr* %32, i32* %3)
%34 = icmp slt i32 %33, 0
br i1 %34, label %35, label %37
35: ; preds = %30
%36 = call i32 @error(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.2, i64 0, i64 0))
br label %37
37: ; preds = %35, %30
br label %38
38: ; preds = %37, %44
%39 = call i32 @bzero(i8* %8, i32 256)
%40 = call i32 @read(i32 %33, i8* %8, i32 255)
%41 = icmp slt i32 %40, 0
br i1 %41, label %42, label %44
42: ; preds = %38
%43 = call i32 @error(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.3, i64 0, i64 0))
br label %44
44: ; preds = %42, %38
%45 = call i32 @write(i32 %33, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i32 18)
%46 = call i32 @puts(i8* %8)
%47 = icmp eq i32 %40, 0
br i1 %47, label %48, label %38
48: ; preds = %44
%49 = call i32 @write(i32 %33, i8* getelementptr inbounds ([1 x i8], [1 x i8]* @.str.6, i64 0, i64 0), i32 0)
%50 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @.str.7, i64 0, i64 0))
%51 = call i32 @close(i32 %33)
%52 = call i32 @close(i32 %13)
ret i32 0
}