#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 *);
int atoi(char *);
scalar_t__ bind(int, struct sockaddr *, int);
int /*<<< orphan*/ bzero(char *, int);
int /*<<< orphan*/ close(int);
int /*<<< orphan*/ error(char *);
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, 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 /*<<< orphan*/ stderr;
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;
  if (argc < 2) {
    fprintf(stderr, "ERROR, no port provided\n");
    exit(1);
  }
  sockfd = socket(AF_INET, SOCK_STREAM, 0);
  if (sockfd < 0)
    error("ERROR opening socket");
  bzero((char *)&serv_addr, sizeof(serv_addr));
  portno = atoi(argv[1]);
  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);
  for (int i = 0; i < 4; i++) {
    n = read(newsockfd, buffer, 255);
    if (n < 0)
      error("ERROR reading from socket");
    printf("Here is the message: %s\n", buffer);
    bzero(buffer, 256);
  }
  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)
cmpl   $0x2,-0x8(%rbp)
jge    1212 <main+0x42>
mov    0x2dd6(%rip),%rax
mov    (%rax),%edi
lea    0xdfd(%rip),%rsi
call   1070 <fprintf@plt>
mov    $0x1,%edi
call   10e0 <exit@plt>
mov    0x2dcf(%rip),%rax
mov    (%rax),%edi
mov    0x2da6(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   10f0 <socket@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    1244 <main+0x74>
lea    0xdda(%rip),%rdi
call   10a0 <error@plt>
lea    -0x130(%rbp),%rdi
mov    $0xc,%esi
call   10b0 <bzero@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   10d0 <atoi@plt>
mov    %eax,-0x1c(%rbp)
mov    0x2d7c(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x128(%rbp)
mov    0x2d65(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x12c(%rbp)
mov    -0x1c(%rbp),%edi
call   1030 <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    12bb <main+0xeb>
lea    0xd78(%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    12fb <main+0x12b>
lea    0xd49(%rip),%rdi
call   10a0 <error@plt>
lea    -0x120(%rbp),%rdi
mov    $0x100,%esi
call   10b0 <bzero@plt>
movl   $0x0,-0x148(%rbp)
cmpl   $0x4,-0x148(%rbp)
jge    138e <main+0x1be>
mov    -0x18(%rbp),%edi
lea    -0x120(%rbp),%rsi
mov    $0xff,%edx
call   1060 <read@plt>
mov    %eax,-0x144(%rbp)
cmpl   $0x0,-0x144(%rbp)
jge    1356 <main+0x186>
lea    0xcfe(%rip),%rdi
call   10a0 <error@plt>
lea    -0x120(%rbp),%rsi
lea    0xd05(%rip),%rdi
call   1040 <printf@plt>
lea    -0x120(%rbp),%rdi
mov    $0x100,%esi
call   10b0 <bzero@plt>
mov    -0x148(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x148(%rbp)
jmp    1316 <main+0x146>
mov    -0x18(%rbp),%edi
call   1050 <close@plt>
mov    -0x14(%rbp),%edi
call   1050 <close@plt>
xor    %eax,%eax
add    $0x150,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %rbx
sub    $0x138,%rsp
cmp    $0x1,%edi
jle    13db <main+0x20b>
mov    %rsi,%rbp
mov    0x2df8(%rip),%r15
mov    (%r15),%edi
mov    0x2dce(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   10f0 <socket@plt>
mov    %eax,%r14d
test   %eax,%eax
jns    1216 <main+0x46>
lea    0xe08(%rip),%rdi
call   10a0 <error@plt>
lea    0x10(%rsp),%rbx
mov    %rbx,%rdi
mov    $0xc,%esi
call   10b0 <bzero@plt>
mov    0x8(%rbp),%rdi
call   10d0 <atoi@plt>
mov    (%r15),%ecx
mov    %ecx,0x18(%rsp)
mov    0x2da1(%rip),%rcx
mov    (%rcx),%ecx
mov    %ecx,0x14(%rsp)
mov    %eax,%edi
call   1030 <htons@plt>
mov    %eax,0x10(%rsp)
mov    %r14d,%edi
mov    %rbx,%rsi
mov    $0xc,%edx
call   1090 <bind@plt>
test   %rax,%rax
jns    1271 <main+0xa1>
lea    0xdc2(%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    12aa <main+0xda>
lea    0xd9a(%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   1060 <read@plt>
test   %eax,%eax
jns    12db <main+0x10b>
lea    0xd79(%rip),%rdi
call   10a0 <error@plt>
lea    0xd87(%rip),%rdi
lea    0x30(%rsp),%rbx
mov    %rbx,%rsi
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x100,%esi
call   10b0 <bzero@plt>
mov    %ebp,%edi
mov    %rbx,%rsi
mov    $0xff,%edx
call   1060 <read@plt>
test   %eax,%eax
jns    131b <main+0x14b>
lea    0xd39(%rip),%rdi
call   10a0 <error@plt>
lea    0xd47(%rip),%rdi
lea    0x30(%rsp),%rbx
mov    %rbx,%rsi
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x100,%esi
call   10b0 <bzero@plt>
mov    %ebp,%edi
mov    %rbx,%rsi
mov    $0xff,%edx
call   1060 <read@plt>
test   %eax,%eax
jns    135b <main+0x18b>
lea    0xcf9(%rip),%rdi
call   10a0 <error@plt>
lea    0xd07(%rip),%rdi
lea    0x30(%rsp),%rbx
mov    %rbx,%rsi
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x100,%esi
call   10b0 <bzero@plt>
mov    %ebp,%edi
mov    %rbx,%rsi
mov    $0xff,%edx
call   1060 <read@plt>
test   %eax,%eax
jns    139b <main+0x1cb>
lea    0xcb9(%rip),%rdi
call   10a0 <error@plt>
lea    0xcc7(%rip),%rdi
lea    0x30(%rsp),%rbx
mov    %rbx,%rsi
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x100,%esi
call   10b0 <bzero@plt>
mov    %ebp,%edi
call   1050 <close@plt>
mov    %r14d,%edi
call   1050 <close@plt>
xor    %eax,%eax
add    $0x138,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret
mov    0x2bee(%rip),%rax
mov    (%rax),%edi
lea    0xc15(%rip),%rsi
call   1070 <fprintf@plt>
mov    $0x1,%edi
call   10e0 <exit@plt>

LLVM IR (-O0):
%struct.sockaddr_in = type { i32, %struct.TYPE_2__, i32 }
%struct.TYPE_2__ = type { i32 }
%struct.sockaddr = type { i32 }
@stderr = global i32 0
@.str = [25 x i8] c"ERROR, no port provided\0A\00"
@AF_INET = global i32 0
@SOCK_STREAM = global i32 0
@.str.1 = [21 x i8] c"ERROR opening socket\00"
@INADDR_ANY = global i32 0
@.str.2 = [17 x i8] c"ERROR on binding\00"
@.str.3 = [16 x i8] c"ERROR on accept\00"
@.str.4 = [26 x i8] c"ERROR reading from socket\00"
@.str.5 = [25 x i8] c"Here is the message: %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 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
%15 = load i32, i32* %4
%16 = icmp slt i32 %15, 2
br i1 %16, label %17, label %21
17: ; preds = %2
%18 = load i32, i32* @stderr
%19 = call i32 @fprintf(i32 %18, i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0))
%20 = call i32 @exit(i32 1)
unreachable
21: ; preds = %2
%22 = load i32, i32* @AF_INET
%23 = load i32, i32* @SOCK_STREAM
%24 = call i32 @socket(i32 %22, i32 %23, i32 0)
store i32 %24, i32* %6
%25 = load i32, i32* %6
%26 = icmp slt i32 %25, 0
br i1 %26, label %27, label %29
27: ; preds = %21
%28 = call i32 @error(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0))
br label %29
29: ; preds = %27, %21
%30 = bitcast %struct.sockaddr_in* %11 to i8*
%31 = call i32 @bzero(i8* %30, i32 12)
%32 = load i8**, i8*** %5
%33 = getelementptr inbounds i8*, i8** %32, i64 1
%34 = load i8*, i8** %33
%35 = call i32 @atoi(i8* %34)
store i32 %35, i32* %8
%36 = load i32, i32* @AF_INET
%37 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %11, i32 0, i32 2
store i32 %36, i32* %37
%38 = load i32, i32* @INADDR_ANY
%39 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %11, i32 0, i32 1
%40 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %39, i32 0, i32 0
store i32 %38, i32* %40
%41 = load i32, i32* %8
%42 = call i32 @htons(i32 %41)
%43 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %11, i32 0, i32 0
store i32 %42, i32* %43
%44 = load i32, i32* %6
%45 = bitcast %struct.sockaddr_in* %11 to %struct.sockaddr*
%46 = call i64 @bind(i32 %44, %struct.sockaddr* %45, i32 12)
%47 = icmp slt i64 %46, 0
br i1 %47, label %48, label %50
48: ; preds = %29
%49 = call i32 @error(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0))
br label %50
50: ; preds = %48, %29
%51 = load i32, i32* %6
%52 = call i32 @listen(i32 %51, i32 5)
store i32 12, i32* %9
%53 = load i32, i32* %6
%54 = bitcast %struct.sockaddr_in* %12 to %struct.sockaddr*
%55 = call i32 @accept(i32 %53, %struct.sockaddr* %54, i32* %9)
store i32 %55, i32* %7
%56 = load i32, i32* %7
%57 = icmp slt i32 %56, 0
br i1 %57, label %58, label %60
58: ; preds = %50
%59 = call i32 @error(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.3, i64 0, i64 0))
br label %60
60: ; preds = %58, %50
%61 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%62 = call i32 @bzero(i8* %61, i32 256)
store i32 0, i32* %14
br label %63
63: ; preds = %79, %60
%64 = load i32, i32* %14
%65 = icmp slt i32 %64, 4
br i1 %65, label %66, label %82
66: ; preds = %63
%67 = load i32, i32* %7
%68 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%69 = call i32 @read(i32 %67, i8* %68, i32 255)
store i32 %69, i32* %13
%70 = load i32, i32* %13
%71 = icmp slt i32 %70, 0
br i1 %71, label %72, label %74
72: ; preds = %66
%73 = call i32 @error(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.4, i64 0, i64 0))
br label %74
74: ; preds = %72, %66
%75 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%76 = call i32 @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.5, i64 0, i64 0), i8* %75)
%77 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%78 = call i32 @bzero(i8* %77, i32 256)
br label %79
79: ; preds = %74
%80 = load i32, i32* %14
%81 = add nsw i32 %80, 1
store i32 %81, i32* %14
br label %63
82: ; preds = %63
%83 = load i32, i32* %7
%84 = call i32 @close(i32 %83)
%85 = load i32, i32* %6
%86 = call i32 @close(i32 %85)
ret i32 0
}

LLVM IR (-O2):
%struct.sockaddr_in = type { i32, %struct.TYPE_2__, i32 }
%struct.TYPE_2__ = type { i32 }
%struct.sockaddr = type { i32 }
@stderr = global i32 0
@.str = [25 x i8] c"ERROR, no port provided\0A\00"
@AF_INET = global i32 0
@SOCK_STREAM = global i32 0
@.str.1 = [21 x i8] c"ERROR opening socket\00"
@INADDR_ANY = global i32 0
@.str.2 = [17 x i8] c"ERROR on binding\00"
@.str.3 = [16 x i8] c"ERROR on accept\00"
@.str.4 = [26 x i8] c"ERROR reading from socket\00"
@.str.5 = [25 x i8] c"Here is the message: %s\0A\00"
define i32 @main(i32 %0, i8** nocapture %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 = icmp slt i32 %0, 2
br i1 %11, label %12, label %16
12: ; preds = %2
%13 = load i32, i32* @stderr
%14 = tail call i32 @fprintf(i32 %13, i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0))
%15 = tail call i32 @exit(i32 1)
unreachable
16: ; preds = %2
%17 = load i32, i32* @AF_INET
%18 = load i32, i32* @SOCK_STREAM
%19 = tail call i32 @socket(i32 %17, i32 %18, i32 0)
%20 = icmp slt i32 %19, 0
br i1 %20, label %21, label %23
21: ; preds = %16
%22 = tail call i32 @error(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0))
br label %23
23: ; preds = %21, %16
%24 = call i32 @bzero(i8* %9, i32 12)
%25 = getelementptr inbounds i8*, i8** %1, i64 1
%26 = load i8*, i8** %25
%27 = tail call i32 @atoi(i8* %26)
%28 = load i32, i32* @AF_INET
%29 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i64 0, i32 2
store i32 %28, i32* %29
%30 = load i32, i32* @INADDR_ANY
%31 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i64 0, i32 1, i32 0
store i32 %30, i32* %31
%32 = tail call i32 @htons(i32 %27)
%33 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i64 0, i32 0
store i32 %32, i32* %33
%34 = bitcast %struct.sockaddr_in* %5 to %struct.sockaddr*
%35 = call i64 @bind(i32 %19, %struct.sockaddr* %34, i32 12)
%36 = icmp slt i64 %35, 0
br i1 %36, label %37, label %39
37: ; preds = %23
%38 = call i32 @error(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0))
br label %39
39: ; preds = %37, %23
%40 = call i32 @listen(i32 %19, i32 5)
store i32 12, i32* %3
%41 = bitcast %struct.sockaddr_in* %6 to %struct.sockaddr*
%42 = call i32 @accept(i32 %19, %struct.sockaddr* %41, i32* %3)
%43 = icmp slt i32 %42, 0
br i1 %43, label %44, label %46
44: ; preds = %39
%45 = call i32 @error(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.3, i64 0, i64 0))
br label %46
46: ; preds = %44, %39
%47 = call i32 @bzero(i8* %8, i32 256)
%48 = call i32 @read(i32 %42, i8* %8, i32 255)
%49 = icmp slt i32 %48, 0
br i1 %49, label %50, label %52
50: ; preds = %46
%51 = call i32 @error(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.4, i64 0, i64 0))
br label %52
52: ; preds = %50, %46
%53 = call i32 @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.5, i64 0, i64 0), i8* %8)
%54 = call i32 @bzero(i8* %8, i32 256)
%55 = call i32 @read(i32 %42, i8* %8, i32 255)
%56 = icmp slt i32 %55, 0
br i1 %56, label %57, label %59
57: ; preds = %52
%58 = call i32 @error(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.4, i64 0, i64 0))
br label %59
59: ; preds = %57, %52
%60 = call i32 @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.5, i64 0, i64 0), i8* %8)
%61 = call i32 @bzero(i8* %8, i32 256)
%62 = call i32 @read(i32 %42, i8* %8, i32 255)
%63 = icmp slt i32 %62, 0
br i1 %63, label %64, label %66
64: ; preds = %59
%65 = call i32 @error(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.4, i64 0, i64 0))
br label %66
66: ; preds = %64, %59
%67 = call i32 @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.5, i64 0, i64 0), i8* %8)
%68 = call i32 @bzero(i8* %8, i32 256)
%69 = call i32 @read(i32 %42, i8* %8, i32 255)
%70 = icmp slt i32 %69, 0
br i1 %70, label %71, label %73
71: ; preds = %66
%72 = call i32 @error(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.4, i64 0, i64 0))
br label %73
73: ; preds = %71, %66
%74 = call i32 @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.5, i64 0, i64 0), i8* %8)
%75 = call i32 @bzero(i8* %8, i32 256)
%76 = call i32 @close(i32 %42)
%77 = call i32 @close(i32 %19)
ret i32 0
}