#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 fork();
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 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;
  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);
  int pid;
  while (1) {
    newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr, &clilen);
    if (newsockfd < 0)
      error("ERROR on accept");
    pid = fork();
    if (pid < 0) {
      error("ERROR in new process creation");
    }
    if (pid == 0) {
      close(sockfd);
      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(newsockfd);
    } else {
      close(newsockfd);
    }
  }
  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    1232 <main+0x42>
mov    0x2db6(%rip),%rax
mov    (%rax),%edi
lea    0xddd(%rip),%rsi
call   1080 <fprintf@plt>
mov    $0x1,%edi
call   10f0 <exit@plt>
mov    0x2daf(%rip),%rax
mov    (%rax),%edi
mov    0x2d86(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1110 <socket@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    1264 <main+0x74>
lea    0xdba(%rip),%rdi
call   10b0 <error@plt>
lea    -0x130(%rbp),%rdi
mov    $0xc,%esi
call   10c0 <bzero@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   10e0 <atoi@plt>
mov    %eax,-0x1c(%rbp)
mov    0x2d5c(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x128(%rbp)
mov    0x2d45(%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   10a0 <bind@plt>
cmp    $0x0,%rax
jge    12db <main+0xeb>
lea    0xd58(%rip),%rdi
call   10b0 <error@plt>
mov    -0x14(%rbp),%edi
mov    $0x5,%esi
call   1090 <listen@plt>
movl   $0xc,-0x20(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x140(%rbp),%rsi
lea    -0x20(%rbp),%rdx
call   10d0 <accept@plt>
mov    %eax,-0x18(%rbp)
cmpl   $0x0,-0x18(%rbp)
jge    131b <main+0x12b>
lea    0xd29(%rip),%rdi
call   10b0 <error@plt>
mov    $0x0,%al
call   1100 <fork@plt>
mov    %eax,-0x148(%rbp)
cmpl   $0x0,-0x148(%rbp)
jge    1341 <main+0x151>
lea    0xd13(%rip),%rdi
call   10b0 <error@plt>
cmpl   $0x0,-0x148(%rbp)
jne    13ed <main+0x1fd>
mov    -0x14(%rbp),%edi
call   1060 <close@plt>
lea    -0x120(%rbp),%rdi
mov    $0x100,%esi
call   10c0 <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    139a <main+0x1aa>
lea    0xcd8(%rip),%rdi
call   10b0 <error@plt>
lea    -0x120(%rbp),%rsi
lea    0xcdf(%rip),%rdi
call   1050 <printf@plt>
mov    -0x18(%rbp),%edi
lea    0xce9(%rip),%rsi
mov    $0x12,%edx
call   1030 <write@plt>
mov    %eax,-0x144(%rbp)
cmpl   $0x0,-0x144(%rbp)
jge    13e0 <main+0x1f0>
lea    0xcd8(%rip),%rdi
call   10b0 <error@plt>
mov    -0x18(%rbp),%edi
call   1060 <close@plt>
jmp    13f5 <main+0x205>
mov    -0x18(%rbp),%edi
call   1060 <close@plt>
jmp    12ef <main+0xff>

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x138,%rsp
cmp    $0x1,%edi
jle    1364 <main+0x174>
mov    %rsi,%rbp
mov    0x2dd4(%rip),%r15
mov    (%r15),%edi
mov    0x2daa(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1110 <socket@plt>
mov    %eax,%ebx
test   %eax,%eax
jns    1239 <main+0x49>
lea    0xde5(%rip),%rdi
call   10b0 <error@plt>
lea    0x10(%rsp),%r14
mov    %r14,%rdi
mov    $0xc,%esi
call   10c0 <bzero@plt>
mov    0x8(%rbp),%rdi
call   10e0 <atoi@plt>
mov    (%r15),%ecx
mov    %ecx,0x18(%rsp)
mov    0x2d7e(%rip),%rcx
mov    (%rcx),%ecx
mov    %ecx,0x14(%rsp)
mov    %eax,%edi
call   1040 <htons@plt>
mov    %eax,0x10(%rsp)
mov    %ebx,%edi
mov    %r14,%rsi
mov    $0xc,%edx
call   10a0 <bind@plt>
test   %rax,%rax
jns    1293 <main+0xa3>
lea    0xda0(%rip),%rdi
call   10b0 <error@plt>
mov    %ebx,%edi
mov    $0x5,%esi
call   1090 <listen@plt>
movl   $0xc,0xc(%rsp)
lea    0x20(%rsp),%r14
lea    0xc(%rsp),%r15
lea    0xd97(%rip),%r12
lea    0x30(%rsp),%r13
jmp    12cc <main+0xdc>
nop
call   10b0 <error@plt>
mov    %ebp,%edi
call   1060 <close@plt>
mov    %ebx,%edi
mov    %r14,%rsi
mov    %r15,%rdx
call   10d0 <accept@plt>
mov    %eax,%ebp
test   %eax,%eax
jns    12eb <main+0xfb>
lea    0xd59(%rip),%rdi
call   10b0 <error@plt>
xor    %eax,%eax
call   1100 <fork@plt>
mov    %r12,%rdi
test   %eax,%eax
js     12c0 <main+0xd0>
jne    12c5 <main+0xd5>
mov    %ebx,%edi
call   1060 <close@plt>
mov    %r13,%rdi
mov    $0x100,%esi
call   10c0 <bzero@plt>
mov    %ebp,%edi
mov    %r13,%rsi
mov    $0xff,%edx
call   1070 <read@plt>
test   %eax,%eax
jns    132e <main+0x13e>
lea    0xd44(%rip),%rdi
call   10b0 <error@plt>
lea    0xd52(%rip),%rdi
mov    %r13,%rsi
call   1050 <printf@plt>
mov    %ebp,%edi
lea    0xd5a(%rip),%rsi
mov    $0x12,%edx
call   1030 <write@plt>
lea    0xd5c(%rip),%rdi
test   %eax,%eax
jns    12c5 <main+0xd5>
jmp    12c0 <main+0xd0>
mov    0x2c65(%rip),%rax
mov    (%rax),%edi
lea    0xc8c(%rip),%rsi
call   1080 <fprintf@plt>
mov    $0x1,%edi
call   10f0 <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 = [30 x i8] c"ERROR in new process creation\00"
@.str.5 = [26 x i8] c"ERROR reading from socket\00"
@.str.6 = [25 x i8] c"Here is the message: %s\0A\00"
@.str.7 = [19 x i8] c"I got your message\00"
@.str.8 = [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
%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
br label %53
53: ; preds = %50, %97
%54 = load i32, i32* %6
%55 = bitcast %struct.sockaddr_in* %12 to %struct.sockaddr*
%56 = call i32 @accept(i32 %54, %struct.sockaddr* %55, i32* %9)
store i32 %56, i32* %7
%57 = load i32, i32* %7
%58 = icmp slt i32 %57, 0
br i1 %58, label %59, label %61
59: ; preds = %53
%60 = call i32 @error(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.3, i64 0, i64 0))
br label %61
61: ; preds = %59, %53
%62 = call i32 (...) @fork()
store i32 %62, i32* %14
%63 = load i32, i32* %14
%64 = icmp slt i32 %63, 0
br i1 %64, label %65, label %67
65: ; preds = %61
%66 = call i32 @error(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.4, i64 0, i64 0))
br label %67
67: ; preds = %65, %61
%68 = load i32, i32* %14
%69 = icmp eq i32 %68, 0
br i1 %69, label %70, label %94
70: ; preds = %67
%71 = load i32, i32* %6
%72 = call i32 @close(i32 %71)
%73 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%74 = call i32 @bzero(i8* %73, i32 256)
%75 = load i32, i32* %7
%76 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%77 = call i32 @read(i32 %75, i8* %76, i32 255)
store i32 %77, i32* %13
%78 = load i32, i32* %13
%79 = icmp slt i32 %78, 0
br i1 %79, label %80, label %82
80: ; preds = %70
%81 = call i32 @error(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.5, i64 0, i64 0))
br label %82
82: ; preds = %80, %70
%83 = getelementptr inbounds [256 x i8], [256 x i8]* %10, i64 0, i64 0
%84 = call i32 @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.6, i64 0, i64 0), i8* %83)
%85 = load i32, i32* %7
%86 = call i32 @write(i32 %85, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.7, i64 0, i64 0), i32 18)
store i32 %86, i32* %13
%87 = load i32, i32* %13
%88 = icmp slt i32 %87, 0
br i1 %88, label %89, label %91
89: ; preds = %82
%90 = call i32 @error(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.8, i64 0, i64 0))
br label %91
91: ; preds = %89, %82
%92 = load i32, i32* %7
%93 = call i32 @close(i32 %92)
br label %97
94: ; preds = %67
%95 = load i32, i32* %7
%96 = call i32 @close(i32 %95)
br label %97
97: ; preds = %94, %91
br label %53
}

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 = [30 x i8] c"ERROR in new process creation\00"
@.str.5 = [26 x i8] c"ERROR reading from socket\00"
@.str.6 = [25 x i8] c"Here is the message: %s\0A\00"
@.str.7 = [19 x i8] c"I got your message\00"
@.str.8 = [24 x i8] c"ERROR writing to socket\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*
br label %42
42: ; preds = %66, %39
%43 = call i32 @accept(i32 %19, %struct.sockaddr* %41, i32* %3)
%44 = icmp slt i32 %43, 0
br i1 %44, label %45, label %47
45: ; preds = %42
%46 = call i32 @error(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.3, i64 0, i64 0))
br label %47
47: ; preds = %45, %42
%48 = call i32 (...) @fork()
%49 = icmp slt i32 %48, 0
br i1 %49, label %63, label %50
50: ; preds = %47
%51 = icmp eq i32 %48, 0
br i1 %51, label %52, label %66
52: ; preds = %50
%53 = call i32 @close(i32 %19)
%54 = call i32 @bzero(i8* %8, i32 256)
%55 = call i32 @read(i32 %43, 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.5, 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.6, i64 0, i64 0), i8* %8)
%61 = call i32 @write(i32 %43, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.7, i64 0, i64 0), i32 18)
%62 = icmp slt i32 %61, 0
br i1 %62, label %63, label %66
63: ; preds = %59, %47
%64 = phi i8* [ getelementptr inbounds ([30 x i8], [30 x i8]* @.str.4, i64 0, i64 0), %47 ], [ getelementptr inbounds ([24 x i8], [24 x i8]* @.str.8, i64 0, i64 0), %59 ]
%65 = call i32 @error(i8* %64)
br label %66
66: ; preds = %63, %50, %59
%67 = call i32 @close(i32 %43)
br label %42
}