#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 sin_port;
  TYPE_1__ sin_addr;
  int /*<<< orphan*/ sin_family;
};
struct sockaddr {
  int dummy;
};
typedef int /*<<< orphan*/ address;

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int /*<<< orphan*/ SOCK_STREAM;
int /*<<< orphan*/ close(int);
int connect(int, struct sockaddr *, int);
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ inet_addr(char *);
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ printf(char *, char);
int /*<<< orphan*/ read(int, char *, int);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int /*<<< orphan*/ write(int, char *, int);
int main() {
  int sockfd;
  int len;
  struct sockaddr_in address;
  int result;
  char ch = 'A';
  sockfd = socket(AF_INET, SOCK_STREAM, 0);
  address.sin_family = AF_INET;
  address.sin_addr.s_addr = inet_addr("127.0.0.1");
  address.sin_port = 9734;
  len = sizeof(address);
  result = connect(sockfd, (struct sockaddr *)&address, len);
  if (result == -1) {
    perror("oops: client2");
    exit(1);
  }
  write(sockfd, &ch, 1);
  read(sockfd, &ch, 1);
  printf("char from server = %c\n", ch);
  close(sockfd);
  exit(0);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movb   $0x41,-0x1d(%rbp)
mov    0x2e3e(%rip),%rax
mov    (%rax),%edi
mov    0x2e25(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   10b0 <socket@plt>
mov    %eax,-0x8(%rbp)
mov    0x2e22(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x10(%rbp)
lea    0xe2e(%rip),%rdi
call   1070 <inet_addr@plt>
mov    %eax,-0x14(%rbp)
movl   $0x2606,-0x18(%rbp)
movl   $0xc,-0xc(%rbp)
mov    -0x8(%rbp),%edi
lea    -0x18(%rbp),%rsi
mov    -0xc(%rbp),%edx
call   10a0 <connect@plt>
mov    %eax,-0x1c(%rbp)
cmpl   $0xffffffff,-0x1c(%rbp)
jne    121a <main+0x8a>
lea    0xdff(%rip),%rdi
call   1080 <perror@plt>
mov    $0x1,%edi
call   1090 <exit@plt>
mov    -0x8(%rbp),%edi
lea    -0x1d(%rbp),%rsi
mov    $0x1,%edx
call   1030 <write@plt>
mov    -0x8(%rbp),%edi
lea    -0x1d(%rbp),%rsi
mov    $0x1,%edx
call   1060 <read@plt>
lea    0xdd5(%rip),%rdi
movsbl -0x1d(%rbp),%esi
call   1040 <printf@plt>
mov    -0x8(%rbp),%edi
call   1050 <close@plt>
xor    %edi,%edi
call   1090 <exit@plt>

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
sub    $0x18,%rsp
movb   $0x41,0x7(%rsp)
mov    0x2e45(%rip),%r14
mov    (%r14),%edi
mov    0x2e2b(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   10b0 <socket@plt>
mov    %eax,%ebx
mov    (%r14),%eax
mov    %eax,0x10(%rsp)
lea    0xe3a(%rip),%rdi
call   1070 <inet_addr@plt>
mov    %eax,0xc(%rsp)
movl   $0x2606,0x8(%rsp)
lea    0x8(%rsp),%rsi
mov    %ebx,%edi
mov    $0xc,%edx
call   10a0 <connect@plt>
cmp    $0xffffffff,%eax
jne    1203 <main+0x73>
lea    0xe16(%rip),%rdi
call   1080 <perror@plt>
mov    $0x1,%edi
call   1090 <exit@plt>
lea    0x7(%rsp),%r14
mov    %ebx,%edi
mov    %r14,%rsi
mov    $0x1,%edx
call   1030 <write@plt>
mov    %ebx,%edi
mov    %r14,%rsi
mov    $0x1,%edx
call   1060 <read@plt>
movsbl 0x7(%rsp),%esi
lea    0xde6(%rip),%rdi
call   1040 <printf@plt>
mov    %ebx,%edi
call   1050 <close@plt>
xor    %edi,%edi
call   1090 <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 = [10 x i8] c"127.0.0.1\00"
@.str.1 = [14 x i8] c"oops: client2\00"
@.str.2 = [23 x i8] c"char from server = %c\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca %struct.sockaddr_in
%5 = alloca i32
%6 = alloca i8
store i32 0, i32* %1
store i8 65, i8* %6
%7 = load i32, i32* @AF_INET
%8 = load i32, i32* @SOCK_STREAM
%9 = call i32 @socket(i32 %7, i32 %8, i32 0)
store i32 %9, i32* %2
%10 = load i32, i32* @AF_INET
%11 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %4, i32 0, i32 2
store i32 %10, i32* %11
%12 = call i32 @inet_addr(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0))
%13 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %4, i32 0, i32 1
%14 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %13, i32 0, i32 0
store i32 %12, i32* %14
%15 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %4, i32 0, i32 0
store i32 9734, i32* %15
store i32 12, i32* %3
%16 = load i32, i32* %2
%17 = bitcast %struct.sockaddr_in* %4 to %struct.sockaddr*
%18 = load i32, i32* %3
%19 = call i32 @connect(i32 %16, %struct.sockaddr* %17, i32 %18)
store i32 %19, i32* %5
%20 = load i32, i32* %5
%21 = icmp eq i32 %20, -1
br i1 %21, label %22, label %25
22: ; preds = %0
%23 = call i32 @perror(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0))
%24 = call i32 @exit(i32 1)
unreachable
25: ; preds = %0
%26 = load i32, i32* %2
%27 = call i32 @write(i32 %26, i8* %6, i32 1)
%28 = load i32, i32* %2
%29 = call i32 @read(i32 %28, i8* %6, i32 1)
%30 = load i8, i8* %6
%31 = call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.2, i64 0, i64 0), i8 signext %30)
%32 = load i32, i32* %2
%33 = call i32 @close(i32 %32)
%34 = call i32 @exit(i32 0)
unreachable
}

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 = [10 x i8] c"127.0.0.1\00"
@.str.1 = [14 x i8] c"oops: client2\00"
@.str.2 = [23 x i8] c"char from server = %c\0A\00"
define i32 @main() {
%1 = alloca %struct.sockaddr_in
%2 = alloca i8
%3 = bitcast %struct.sockaddr_in* %1 to i8*
store i8 65, i8* %2
%4 = load i32, i32* @AF_INET
%5 = load i32, i32* @SOCK_STREAM
%6 = tail call i32 @socket(i32 %4, i32 %5, i32 0)
%7 = load i32, i32* @AF_INET
%8 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %1, i64 0, i32 2
store i32 %7, i32* %8
%9 = tail call i32 @inet_addr(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0))
%10 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %1, i64 0, i32 1, i32 0
store i32 %9, i32* %10
%11 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %1, i64 0, i32 0
store i32 9734, i32* %11
%12 = bitcast %struct.sockaddr_in* %1 to %struct.sockaddr*
%13 = call i32 @connect(i32 %6, %struct.sockaddr* %12, i32 12)
%14 = icmp eq i32 %13, -1
br i1 %14, label %15, label %18
15: ; preds = %0
%16 = call i32 @perror(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0))
%17 = call i32 @exit(i32 1)
unreachable
18: ; preds = %0
%19 = call i32 @write(i32 %6, i8* %2, i32 1)
%20 = call i32 @read(i32 %6, i8* %2, i32 1)
%21 = load i8, i8* %2
%22 = call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.2, i64 0, i64 0), i8 signext %21)
%23 = call i32 @close(i32 %6)
%24 = call i32 @exit(i32 0)
unreachable
}