#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 *, 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, portno;
  socklen_t clilen;
  char buffer[256];
  struct sockaddr_in serv_addr, cli_addr;
  int n;
  sockfd = socket(AF_INET, SOCK_STREAM, 0);
  if (sockfd < 0)
    error("ERROR opening socket");
  bzero((char *)&serv_addr, sizeof(serv_addr));
  portno = 4951;
  serv_addr.sin_family = AF_INET;
  serv_addr.sin_addr.s_addr = INADDR_ANY;
  serv_addr.sin_port = htons(portno);
  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");
  bzero(buffer, 256);
  n = read(newsockfd, buffer, 255);
  if (n < 0)
    error("ERROR reading from socket");
  printf("Here is the message: %s\n", buffer);
  n = write(newsockfd, "I got your message", 18);
  if (n < 0)
    error("ERROR writing to socket");
  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)
mov    0x2e18(%rip),%rax
mov    (%rax),%edi
mov    0x2df7(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   10d0 <socket@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    11fb <main+0x4b>
lea    0xe0a(%rip),%rdi
call   10a0 <error@plt>
lea    -0x130(%rbp),%rdi
mov    $0xc,%esi
call   10b0 <bzero@plt>
movl   $0x1357,-0x1c(%rbp)
mov    0x2dce(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x128(%rbp)
mov    0x2db7(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x12c(%rbp)
mov    -0x1c(%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,-0x20(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x140(%rbp),%rsi
lea    -0x20(%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>
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    12ed <main+0x13d>
lea    0xd4e(%rip),%rdi
call   10a0 <error@plt>
lea    -0x120(%rbp),%rsi
lea    0xd55(%rip),%rdi
call   1050 <printf@plt>
mov    -0x18(%rbp),%edi
lea    0xd5f(%rip),%rsi
mov    $0x12,%edx
call   1030 <write@plt>
mov    %eax,-0x144(%rbp)
cmpl   $0x0,-0x144(%rbp)
jge    1333 <main+0x183>
lea    0xd4e(%rip),%rdi
call   10a0 <error@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   %r14
push   %rbx
sub    $0x130,%rsp
mov    0x2e26(%rip),%rbx
mov    (%rbx),%edi
mov    0x2e05(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   10d0 <socket@plt>
mov    %eax,%r14d
test   %eax,%eax
jns    11e7 <main+0x37>
lea    0xe1e(%rip),%rdi
call   10a0 <error@plt>
lea    0x10(%rsp),%rbp
mov    %rbp,%rdi
mov    $0xc,%esi
call   10b0 <bzero@plt>
mov    (%rbx),%eax
mov    %eax,0x18(%rsp)
mov    0x2dda(%rip),%rax
mov    (%rax),%eax
mov    %eax,0x14(%rsp)
mov    $0x1357,%edi
call   1040 <htons@plt>
mov    %eax,0x10(%rsp)
mov    %r14d,%edi
mov    %rbp,%rsi
mov    $0xc,%edx
call   1090 <bind@plt>
test   %rax,%rax
jns    123b <main+0x8b>
lea    0xddf(%rip),%rdi
call   10a0 <error@plt>
mov    %r14d,%edi
mov    $0x5,%esi
call   1080 <listen@plt>
movl   $0xc,0xc(%rsp)
lea    0x20(%rsp),%rsi
lea    0xc(%rsp),%rdx
mov    %r14d,%edi
call   10c0 <accept@plt>
mov    %eax,%ebp
test   %eax,%eax
jns    1274 <main+0xc4>
lea    0xdb7(%rip),%rdi
call   10a0 <error@plt>
lea    0x30(%rsp),%rbx
mov    %rbx,%rdi
mov    $0x100,%esi
call   10b0 <bzero@plt>
mov    %ebp,%edi
mov    %rbx,%rsi
mov    $0xff,%edx
call   1070 <read@plt>
test   %eax,%eax
jns    12a5 <main+0xf5>
lea    0xd96(%rip),%rdi
call   10a0 <error@plt>
lea    0xda4(%rip),%rdi
lea    0x30(%rsp),%rsi
call   1050 <printf@plt>
lea    0xdac(%rip),%rsi
mov    %ebp,%edi
mov    $0x12,%edx
call   1030 <write@plt>
test   %eax,%eax
jns    12d9 <main+0x129>
lea    0xda8(%rip),%rdi
call   10a0 <error@plt>
mov    %r14d,%edi
call   1060 <close@plt>
xor    %eax,%eax
add    $0x130,%rsp
pop    %rbx
pop    %r14
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 = [25 x i8] c"Here is the message: %s\0A\00"
@.str.5 = [19 x i8] c"I got your message\00"
@.str.6 = [24 x i8] c"ERROR writing to socket\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
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%14 = load i32, i32* @AF_INET
%15 = load i32, i32* @SOCK_STREAM
%16 = call i32 @socket(i32 %14, i32 %15, i32 0)
store i32 %16, i32* %6
%17 = load i32, i32* %6
%18 = icmp slt i32 %17, 0
br i1 %18, label %19, label %21
19: ; preds = %2
%20 = call i32 @error(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0))
br label %21
21: ; preds = %19, %2
%22 = bitcast %struct.sockaddr_in* %11 to i8*
%23 = call i32 @bzero(i8* %22, i32 12)
store i32 4951, i32* %8
%24 = load i32, i32* @AF_INET
%25 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %11, i32 0, i32 2
store i32 %24, i32* %25
%26 = load i32, i32* @INADDR_ANY
%27 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %11, i32 0, i32 1
%28 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %27, i32 0, i32 0
store i32 %26, i32* %28
%29 = load i32, i32* %8
%30 = call i32 @htons(i32 %29)
%31 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %11, i32 0, i32 0
store i32 %30, i32* %31
%32 = load i32, i32* %6
%33 = bitcast %struct.sockaddr_in* %11 to %struct.sockaddr*
%34 = call i64 @bind(i32 %32, %struct.sockaddr* %33, i32 12)
%35 = icmp slt i64 %34, 0
br i1 %35, label %36, label %38
36: ; preds = %21
%37 = call i32 @error(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.1, i64 0, i64 0))
br label %38
38: ; preds = %36, %21
%39 = load i32, i32* %6
%40 = call i32 @listen(i32 %39, i32 5)
store i32 12, i32* %9
%41 = load i32, i32* %6
%42 = bitcast %struct.sockaddr_in* %12 to %struct.sockaddr*
%43 = call i32 @accept(i32 %41, %struct.sockaddr* %42, i32* %9)
store i32 %43, i32* %7
%44 = load i32, i32* %7
%45 = icmp slt i32 %44, 0
br i1 %45, label %46, label %48
46: ; preds = %38
%47 = call i32 @error(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.2, i64 0, i64 0))
br label %48
48: ; preds = %46, %38
%49 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%50 = call i32 @bzero(i8* %49, i32 256)
%51 = load i32, i32* %7
%52 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%53 = call i32 @read(i32 %51, i8* %52, i32 255)
store i32 %53, i32* %13
%54 = load i32, i32* %13
%55 = icmp slt i32 %54, 0
br i1 %55, label %56, label %58
56: ; preds = %48
%57 = call i32 @error(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.3, i64 0, i64 0))
br label %58
58: ; preds = %56, %48
%59 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%60 = call i32 @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.4, i64 0, i64 0), i8* %59)
%61 = load i32, i32* %7
%62 = call i32 @write(i32 %61, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.5, i64 0, i64 0), i32 18)
store i32 %62, i32* %13
%63 = load i32, i32* %13
%64 = icmp slt i32 %63, 0
br i1 %64, label %65, label %67
65: ; preds = %58
%66 = call i32 @error(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.6, i64 0, i64 0))
br label %67
67: ; preds = %65, %58
%68 = load i32, i32* %6
%69 = call i32 @close(i32 %68)
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 = [25 x i8] c"Here is the message: %s\0A\00"
@.str.5 = [19 x i8] c"I got your message\00"
@.str.6 = [24 x i8] c"ERROR writing to socket\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 4951)
%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
%38 = call i32 @bzero(i8* %8, i32 256)
%39 = call i32 @read(i32 %33, i8* %8, i32 255)
%40 = icmp slt i32 %39, 0
br i1 %40, label %41, label %43
41: ; preds = %37
%42 = call i32 @error(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.3, i64 0, i64 0))
br label %43
43: ; preds = %41, %37
%44 = call i32 @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.4, i64 0, i64 0), i8* %8)
%45 = call i32 @write(i32 %33, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.5, i64 0, i64 0), i32 18)
%46 = icmp slt i32 %45, 0
br i1 %46, label %47, label %49
47: ; preds = %43
%48 = call i32 @error(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.6, i64 0, i64 0))
br label %49
49: ; preds = %47, %43
%50 = call i32 @close(i32 %13)
ret i32 0
}