#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 /*<<< 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*/ exit(int);
int /*<<< orphan*/ htons(int);
int /*<<< orphan*/ listen(int, int);
int /*<<< orphan*/ perror(char *);
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, clilen;
  char buffer[256];
  struct sockaddr_in serv_addr, cli_addr;
  int n;
  sockfd = socket(AF_INET, SOCK_STREAM, 0);
  if (sockfd < 0) {
    perror("ERROR opening socket");
    exit(1);
  }
  bzero((char *)&serv_addr, sizeof(serv_addr));
  portno = 5001;
  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) {
    perror("ERROR on binding");
    exit(1);
  }
  listen(sockfd, 5);
  clilen = sizeof(cli_addr);
  newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr, &clilen);
  if (newsockfd < 0) {
    perror("ERROR on accept");
    exit(1);
  }
  bzero(buffer, 256);
  n = read(newsockfd, buffer, 255);
  if (n < 0) {
    perror("ERROR reading from socket");
    exit(1);
  }
  printf("Here is the message: %s\n", buffer);
  n = write(newsockfd, "I got your message", 18);
  if (n < 0) {
    perror("ERROR writing to socket");
    exit(1);
  }
  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    1205 <main+0x55>
lea    0xe0a(%rip),%rdi
call   1090 <perror@plt>
mov    $0x1,%edi
call   10c0 <exit@plt>
lea    -0x130(%rbp),%rdi
mov    $0xc,%esi
call   10a0 <bzero@plt>
movl   $0x1389,-0x1c(%rbp)
mov    0x2dc4(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x128(%rbp)
mov    0x2dad(%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   1080 <bind@plt>
cmp    $0x0,%rax
jge    127d <main+0xcd>
lea    0xda7(%rip),%rdi
call   1090 <perror@plt>
mov    $0x1,%edi
call   10c0 <exit@plt>
mov    -0x14(%rbp),%edi
mov    $0x5,%esi
call   1070 <listen@plt>
movl   $0xc,-0x20(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x140(%rbp),%rsi
lea    -0x20(%rbp),%rdx
call   10b0 <accept@plt>
mov    %eax,-0x18(%rbp)
cmpl   $0x0,-0x18(%rbp)
jge    12c7 <main+0x117>
lea    0xd6e(%rip),%rdi
call   1090 <perror@plt>
mov    $0x1,%edi
call   10c0 <exit@plt>
lea    -0x120(%rbp),%rdi
mov    $0x100,%esi
call   10a0 <bzero@plt>
mov    -0x18(%rbp),%edi
lea    -0x120(%rbp),%rsi
mov    $0xff,%edx
call   1060 <read@plt>
mov    %eax,-0x144(%rbp)
cmpl   $0x0,-0x144(%rbp)
jge    1315 <main+0x165>
lea    0xd30(%rip),%rdi
call   1090 <perror@plt>
mov    $0x1,%edi
call   10c0 <exit@plt>
lea    -0x120(%rbp),%rsi
lea    0xd2d(%rip),%rdi
call   1050 <printf@plt>
mov    -0x18(%rbp),%edi
lea    0xd37(%rip),%rsi
mov    $0x12,%edx
call   1030 <write@plt>
mov    %eax,-0x144(%rbp)
cmpl   $0x0,-0x144(%rbp)
jge    1365 <main+0x1b5>
lea    0xd26(%rip),%rdi
call   1090 <perror@plt>
mov    $0x1,%edi
call   10c0 <exit@plt>
xor    %eax,%eax
add    $0x150,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
sub    $0x130,%rsp
mov    0x2e25(%rip),%r15
mov    (%r15),%edi
mov    0x2e03(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   10d0 <socket@plt>
test   %eax,%eax
js     12b3 <main+0x103>
mov    %eax,%ebx
lea    0x10(%rsp),%r14
mov    %r14,%rdi
mov    $0xc,%esi
call   10a0 <bzero@plt>
mov    (%r15),%eax
mov    %eax,0x18(%rsp)
mov    0x2de0(%rip),%rax
mov    (%rax),%eax
mov    %eax,0x14(%rsp)
mov    $0x1389,%edi
call   1040 <htons@plt>
mov    %eax,0x10(%rsp)
mov    %ebx,%edi
mov    %r14,%rsi
mov    $0xc,%edx
call   1080 <bind@plt>
test   %rax,%rax
js     12bc <main+0x10c>
mov    %ebx,%edi
mov    $0x5,%esi
call   1070 <listen@plt>
movl   $0xc,0xc(%rsp)
lea    0x20(%rsp),%rsi
lea    0xc(%rsp),%rdx
mov    %ebx,%edi
call   10b0 <accept@plt>
test   %eax,%eax
js     12c5 <main+0x115>
mov    %eax,%ebx
lea    0x30(%rsp),%r14
mov    %r14,%rdi
mov    $0x100,%esi
call   10a0 <bzero@plt>
mov    %ebx,%edi
mov    %r14,%rsi
mov    $0xff,%edx
call   1060 <read@plt>
test   %eax,%eax
js     12ce <main+0x11e>
lea    0xdcd(%rip),%rdi
lea    0x30(%rsp),%rsi
call   1050 <printf@plt>
lea    0xdd5(%rip),%rsi
mov    %ebx,%edi
mov    $0x12,%edx
call   1030 <write@plt>
test   %eax,%eax
js     12d7 <main+0x127>
xor    %eax,%eax
add    $0x130,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret
lea    0xd46(%rip),%rdi
jmp    12de <main+0x12e>
lea    0xd52(%rip),%rdi
jmp    12de <main+0x12e>
lea    0xd5a(%rip),%rdi
jmp    12de <main+0x12e>
lea    0xd61(%rip),%rdi
jmp    12de <main+0x12e>
lea    0xd9e(%rip),%rdi
call   1090 <perror@plt>
mov    $0x1,%edi
call   10c0 <exit@plt>

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 %22
19: ; preds = %2
%20 = call i32 @perror(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0))
%21 = call i32 @exit(i32 1)
unreachable
22: ; preds = %2
%23 = bitcast %struct.sockaddr_in* %11 to i8*
%24 = call i32 @bzero(i8* %23, i32 12)
store i32 5001, i32* %8
%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* %8
%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 %40
37: ; preds = %22
%38 = call i32 @perror(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.1, i64 0, i64 0))
%39 = call i32 @exit(i32 1)
unreachable
40: ; preds = %22
%41 = load i32, i32* %6
%42 = call i32 @listen(i32 %41, i32 5)
store i32 12, i32* %9
%43 = load i32, i32* %6
%44 = bitcast %struct.sockaddr_in* %12 to %struct.sockaddr*
%45 = call i32 @accept(i32 %43, %struct.sockaddr* %44, i32* %9)
store i32 %45, i32* %7
%46 = load i32, i32* %7
%47 = icmp slt i32 %46, 0
br i1 %47, label %48, label %51
48: ; preds = %40
%49 = call i32 @perror(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.2, i64 0, i64 0))
%50 = call i32 @exit(i32 1)
unreachable
51: ; preds = %40
%52 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%53 = call i32 @bzero(i8* %52, i32 256)
%54 = load i32, i32* %7
%55 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%56 = call i32 @read(i32 %54, i8* %55, i32 255)
store i32 %56, i32* %13
%57 = load i32, i32* %13
%58 = icmp slt i32 %57, 0
br i1 %58, label %59, label %62
59: ; preds = %51
%60 = call i32 @perror(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.3, i64 0, i64 0))
%61 = call i32 @exit(i32 1)
unreachable
62: ; preds = %51
%63 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%64 = call i32 @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.4, i64 0, i64 0), i8* %63)
%65 = load i32, i32* %7
%66 = call i32 @write(i32 %65, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.5, i64 0, i64 0), i32 18)
store i32 %66, i32* %13
%67 = load i32, i32* %13
%68 = icmp slt i32 %67, 0
br i1 %68, label %69, label %72
69: ; preds = %62
%70 = call i32 @perror(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.6, i64 0, i64 0))
%71 = call i32 @exit(i32 1)
unreachable
72: ; preds = %62
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 %18
15: ; preds = %2
%16 = tail call i32 @perror(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0))
%17 = tail call i32 @exit(i32 1)
unreachable
18: ; preds = %2
%19 = call i32 @bzero(i8* %9, i32 12)
%20 = load i32, i32* @AF_INET
%21 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i64 0, i32 2
store i32 %20, i32* %21
%22 = load i32, i32* @INADDR_ANY
%23 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i64 0, i32 1, i32 0
store i32 %22, i32* %23
%24 = tail call i32 @htons(i32 5001)
%25 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i64 0, i32 0
store i32 %24, i32* %25
%26 = bitcast %struct.sockaddr_in* %5 to %struct.sockaddr*
%27 = call i64 @bind(i32 %13, %struct.sockaddr* %26, i32 12)
%28 = icmp slt i64 %27, 0
br i1 %28, label %29, label %32
29: ; preds = %18
%30 = call i32 @perror(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.1, i64 0, i64 0))
%31 = call i32 @exit(i32 1)
unreachable
32: ; preds = %18
%33 = call i32 @listen(i32 %13, i32 5)
store i32 12, i32* %3
%34 = bitcast %struct.sockaddr_in* %6 to %struct.sockaddr*
%35 = call i32 @accept(i32 %13, %struct.sockaddr* %34, i32* %3)
%36 = icmp slt i32 %35, 0
br i1 %36, label %37, label %40
37: ; preds = %32
%38 = call i32 @perror(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.2, i64 0, i64 0))
%39 = call i32 @exit(i32 1)
unreachable
40: ; preds = %32
%41 = call i32 @bzero(i8* %8, i32 256)
%42 = call i32 @read(i32 %35, i8* %8, i32 255)
%43 = icmp slt i32 %42, 0
br i1 %43, label %44, label %47
44: ; preds = %40
%45 = call i32 @perror(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.3, i64 0, i64 0))
%46 = call i32 @exit(i32 1)
unreachable
47: ; preds = %40
%48 = call i32 @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.4, i64 0, i64 0), i8* %8)
%49 = call i32 @write(i32 %35, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.5, i64 0, i64 0), i32 18)
%50 = icmp slt i32 %49, 0
br i1 %50, label %51, label %54
51: ; preds = %47
%52 = call i32 @perror(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.6, i64 0, i64 0))
%53 = call i32 @exit(i32 1)
unreachable
54: ; preds = %47
ret i32 0
}