#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*/ close(int);
int /*<<< orphan*/ doprocessing(int);
int /*<<< orphan*/ exit(int);
int fork();
int /*<<< orphan*/ htons(int);
int /*<<< orphan*/ listen(int, int);
int /*<<< orphan*/ perror(char *);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int main(int argc, char *argv[]) {
  int sockfd, newsockfd, portno, clilen;
  char buffer[256];
  struct sockaddr_in serv_addr, cli_addr;
  int n, pid;
  sockfd = socket(AF_INET, SOCK_STREAM, 0);
  if (sockfd < 0) {
    perror("MSS: ERROR opening socket\n");
    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("MSS: ERROR on binding\n");
    exit(1);
  }
  listen(sockfd, 5);
  clilen = sizeof(cli_addr);
  while (1) {
    newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr, &clilen);
    if (newsockfd < 0) {
      perror("MSS: ERROR on accept\n");
      exit(1);
    }
    pid = fork();
    if (pid < 0) {
      perror("MSS: ERROR on fork\n");
      exit(1);
    }
    if (pid == 0) {
      close(sockfd);
      doprocessing(newsockfd);
      exit(0);
    } else {
      close(newsockfd);
    }
  }
}


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   1070 <perror@plt>
mov    $0x1,%edi
call   10b0 <exit@plt>
lea    -0x130(%rbp),%rdi
mov    $0xc,%esi
call   1080 <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   1030 <htons@plt>
mov    %eax,-0x130(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x130(%rbp),%rsi
mov    $0xc,%edx
call   1060 <bind@plt>
cmp    $0x0,%rax
jge    127d <main+0xcd>
lea    0xdad(%rip),%rdi
call   1070 <perror@plt>
mov    $0x1,%edi
call   10b0 <exit@plt>
mov    -0x14(%rbp),%edi
mov    $0x5,%esi
call   1050 <listen@plt>
movl   $0xc,-0x20(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x140(%rbp),%rsi
lea    -0x20(%rbp),%rdx
call   1090 <accept@plt>
mov    %eax,-0x18(%rbp)
cmpl   $0x0,-0x18(%rbp)
jge    12c7 <main+0x117>
lea    0xd7a(%rip),%rdi
call   1070 <perror@plt>
mov    $0x1,%edi
call   10b0 <exit@plt>
mov    $0x0,%al
call   10c0 <fork@plt>
mov    %eax,-0x148(%rbp)
cmpl   $0x0,-0x148(%rbp)
jge    12f7 <main+0x147>
lea    0xd60(%rip),%rdi
call   1070 <perror@plt>
mov    $0x1,%edi
call   10b0 <exit@plt>
cmpl   $0x0,-0x148(%rbp)
jne    131b <main+0x16b>
mov    -0x14(%rbp),%edi
call   1040 <close@plt>
mov    -0x18(%rbp),%edi
call   10a0 <doprocessing@plt>
xor    %edi,%edi
call   10b0 <exit@plt>
mov    -0x18(%rbp),%edi
call   1040 <close@plt>
jmp    1291 <main+0xe1>

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %rbx
sub    $0x28,%rsp
mov    0x2e27(%rip),%rbp
mov    0x0(%rbp),%edi
mov    0x2e05(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   10d0 <socket@plt>
test   %eax,%eax
jns    11e4 <main+0x34>
lea    0xe21(%rip),%rdi
jmp    12a8 <main+0xf8>
mov    %eax,%r15d
lea    0x8(%rsp),%rbx
mov    %rbx,%rdi
mov    $0xc,%esi
call   1080 <bzero@plt>
mov    0x0(%rbp),%eax
mov    %eax,0x10(%rsp)
mov    0x2dd9(%rip),%rax
mov    (%rax),%eax
mov    %eax,0xc(%rsp)
mov    $0x1389,%edi
call   1030 <htons@plt>
mov    %eax,0x8(%rsp)
mov    %r15d,%edi
mov    %rbx,%rsi
mov    $0xc,%edx
call   1060 <bind@plt>
test   %rax,%rax
jns    1239 <main+0x89>
lea    0xde4(%rip),%rdi
jmp    12a8 <main+0xf8>
mov    %r15d,%edi
mov    $0x5,%esi
call   1050 <listen@plt>
movl   $0xc,0x4(%rsp)
lea    0x18(%rsp),%rsi
lea    0x4(%rsp),%rdx
mov    %r15d,%edi
call   1090 <accept@plt>
test   %eax,%eax
js     1298 <main+0xe8>
mov    %eax,%ebp
lea    0x18(%rsp),%r14
lea    0x4(%rsp),%rbx
xor    %eax,%eax
call   10c0 <fork@plt>
test   %eax,%eax
js     12a1 <main+0xf1>
je     12b7 <main+0x107>
mov    %ebp,%edi
call   1040 <close@plt>
mov    %r15d,%edi
mov    %r14,%rsi
mov    %rbx,%rdx
call   1090 <accept@plt>
mov    %eax,%ebp
test   %eax,%eax
jns    1270 <main+0xc0>
lea    0xd93(%rip),%rdi
jmp    12a8 <main+0xf8>
lea    0xda0(%rip),%rdi
call   1070 <perror@plt>
mov    $0x1,%edi
call   10b0 <exit@plt>
mov    %r15d,%edi
call   1040 <close@plt>
mov    %ebp,%edi
call   10a0 <doprocessing@plt>
xor    %edi,%edi
call   10b0 <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 = [27 x i8] c"MSS: ERROR opening socket\0A\00"
@INADDR_ANY = global i32 0
@.str.1 = [23 x i8] c"MSS: ERROR on binding\0A\00"
@.str.2 = [22 x i8] c"MSS: ERROR on accept\0A\00"
@.str.3 = [20 x i8] c"MSS: ERROR on fork\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* @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 %23
20: ; preds = %2
%21 = call i32 @perror(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str, i64 0, i64 0))
%22 = call i32 @exit(i32 1)
unreachable
23: ; preds = %2
%24 = bitcast %struct.sockaddr_in* %11 to i8*
%25 = call i32 @bzero(i8* %24, i32 12)
store i32 5001, i32* %8
%26 = load i32, i32* @AF_INET
%27 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %11, i32 0, i32 2
store i32 %26, i32* %27
%28 = load i32, i32* @INADDR_ANY
%29 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %11, i32 0, i32 1
%30 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %29, i32 0, i32 0
store i32 %28, i32* %30
%31 = load i32, i32* %8
%32 = call i32 @htons(i32 %31)
%33 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %11, i32 0, i32 0
store i32 %32, i32* %33
%34 = load i32, i32* %6
%35 = bitcast %struct.sockaddr_in* %11 to %struct.sockaddr*
%36 = call i64 @bind(i32 %34, %struct.sockaddr* %35, i32 12)
%37 = icmp slt i64 %36, 0
br i1 %37, label %38, label %41
38: ; preds = %23
%39 = call i32 @perror(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.1, i64 0, i64 0))
%40 = call i32 @exit(i32 1)
unreachable
41: ; preds = %23
%42 = load i32, i32* %6
%43 = call i32 @listen(i32 %42, i32 5)
store i32 12, i32* %9
br label %44
44: ; preds = %41, %72
%45 = load i32, i32* %6
%46 = bitcast %struct.sockaddr_in* %12 to %struct.sockaddr*
%47 = call i32 @accept(i32 %45, %struct.sockaddr* %46, i32* %9)
store i32 %47, i32* %7
%48 = load i32, i32* %7
%49 = icmp slt i32 %48, 0
br i1 %49, label %50, label %53
50: ; preds = %44
%51 = call i32 @perror(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.2, i64 0, i64 0))
%52 = call i32 @exit(i32 1)
unreachable
53: ; preds = %44
%54 = call i32 (...) @fork()
store i32 %54, i32* %14
%55 = load i32, i32* %14
%56 = icmp slt i32 %55, 0
br i1 %56, label %57, label %60
57: ; preds = %53
%58 = call i32 @perror(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.3, i64 0, i64 0))
%59 = call i32 @exit(i32 1)
unreachable
60: ; preds = %53
%61 = load i32, i32* %14
%62 = icmp eq i32 %61, 0
br i1 %62, label %63, label %69
63: ; preds = %60
%64 = load i32, i32* %6
%65 = call i32 @close(i32 %64)
%66 = load i32, i32* %7
%67 = call i32 @doprocessing(i32 %66)
%68 = call i32 @exit(i32 0)
unreachable
69: ; preds = %60
%70 = load i32, i32* %7
%71 = call i32 @close(i32 %70)
br label %72
72: ; preds = %69
br label %44
}

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 = [27 x i8] c"MSS: ERROR opening socket\0A\00"
@INADDR_ANY = global i32 0
@.str.1 = [23 x i8] c"MSS: ERROR on binding\0A\00"
@.str.2 = [22 x i8] c"MSS: ERROR on accept\0A\00"
@.str.3 = [20 x i8] c"MSS: ERROR on fork\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca i32
%4 = alloca %struct.sockaddr_in
%5 = alloca %struct.sockaddr_in
%6 = bitcast i32* %3 to i8*
%7 = bitcast %struct.sockaddr_in* %4 to i8*
%8 = bitcast %struct.sockaddr_in* %5 to i8*
%9 = load i32, i32* @AF_INET
%10 = load i32, i32* @SOCK_STREAM
%11 = tail call i32 @socket(i32 %9, i32 %10, i32 0)
%12 = icmp slt i32 %11, 0
br i1 %12, label %13, label %16
13: ; preds = %2
%14 = tail call i32 @perror(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str, i64 0, i64 0))
%15 = tail call i32 @exit(i32 1)
unreachable
16: ; preds = %2
%17 = call i32 @bzero(i8* %7, i32 12)
%18 = load i32, i32* @AF_INET
%19 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %4, i64 0, i32 2
store i32 %18, i32* %19
%20 = load i32, i32* @INADDR_ANY
%21 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %4, i64 0, i32 1, i32 0
store i32 %20, i32* %21
%22 = tail call i32 @htons(i32 5001)
%23 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %4, i64 0, i32 0
store i32 %22, i32* %23
%24 = bitcast %struct.sockaddr_in* %4 to %struct.sockaddr*
%25 = call i64 @bind(i32 %11, %struct.sockaddr* %24, i32 12)
%26 = icmp slt i64 %25, 0
br i1 %26, label %27, label %30
27: ; preds = %16
%28 = call i32 @perror(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.1, i64 0, i64 0))
%29 = call i32 @exit(i32 1)
unreachable
30: ; preds = %16
%31 = call i32 @listen(i32 %11, i32 5)
store i32 12, i32* %3
%32 = bitcast %struct.sockaddr_in* %5 to %struct.sockaddr*
%33 = call i32 @accept(i32 %11, %struct.sockaddr* %32, i32* %3)
%34 = icmp slt i32 %33, 0
br i1 %34, label %35, label %38
35: ; preds = %51, %30
%36 = call i32 @perror(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.2, i64 0, i64 0))
%37 = call i32 @exit(i32 1)
unreachable
38: ; preds = %30, %51
%39 = phi i32 [ %53, %51 ], [ %33, %30 ]
%40 = call i32 (...) @fork()
%41 = icmp slt i32 %40, 0
br i1 %41, label %42, label %45
42: ; preds = %38
%43 = call i32 @perror(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.3, i64 0, i64 0))
%44 = call i32 @exit(i32 1)
unreachable
45: ; preds = %38
%46 = icmp eq i32 %40, 0
br i1 %46, label %47, label %51
47: ; preds = %45
%48 = call i32 @close(i32 %11)
%49 = call i32 @doprocessing(i32 %39)
%50 = call i32 @exit(i32 0)
unreachable
51: ; preds = %45
%52 = call i32 @close(i32 %39)
%53 = call i32 @accept(i32 %11, %struct.sockaddr* %32, i32* %3)
%54 = icmp slt i32 %53, 0
br i1 %54, label %35, label %38
}