#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 */

/* Type definitions */
struct sockaddr_in {
  int /*<<< orphan*/ sin_addr;
  int /*<<< orphan*/ sin_port;
  int /*<<< orphan*/ sin_family;
};
struct sockaddr {
  int dummy;
};
typedef int /*<<< orphan*/ data;
typedef int /*<<< orphan*/ addr;

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int EXIT_FAILURE;
int EXIT_SUCCESS;
int /*<<< orphan*/ IPPROTO_UDP;
int /*<<< orphan*/ SOCK_DGRAM;
scalar_t__ connect(int, struct sockaddr *, int);
int /*<<< orphan*/ errno;
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ htons(int);
int /*<<< orphan*/ inet_aton(char *, int /*<<< orphan*/ *);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int /*<<< orphan*/ stderr;
char *strerror(int /*<<< orphan*/);
scalar_t__ write(int, int *, int);
int main(void) {
  int sock;
  if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
    fprintf(stderr, "socket() failed: %s\n.", strerror(errno));
    return (EXIT_FAILURE);
  }
  struct sockaddr_in addr;
  addr.sin_family = AF_INET;
  addr.sin_port = htons(8000);
  inet_aton("127.0.0.1", &addr.sin_addr);
  if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
    fprintf(stderr, "connect() failed: %s\n.", strerror(errno));
    return (EXIT_FAILURE);
  }
  int data = 42;
  if (write(sock, &data, sizeof(data)) < 0) {
    fprintf(stderr, "write() failed: %s\n.", strerror(errno));
    return (EXIT_FAILURE);
  }
  return (EXIT_SUCCESS);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
mov    0x2e62(%rip),%rax
mov    (%rax),%edi
mov    0x2e51(%rip),%rax
mov    (%rax),%esi
mov    0x2e10(%rip),%rax
mov    (%rax),%edx
call   1090 <socket@plt>
mov    %eax,-0x8(%rbp)
cmp    $0x0,%eax
jge    11e8 <main+0x78>
mov    0x2e1e(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x20(%rbp)
mov    0x2e0a(%rip),%rax
mov    (%rax),%edi
call   1080 <strerror@plt>
mov    -0x20(%rbp),%edi
mov    %rax,%rdx
lea    0xe2e(%rip),%rsi
call   1050 <fprintf@plt>
mov    0x2de2(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
jmp    12d4 <main+0x164>
mov    0x2df9(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x10(%rbp)
mov    $0x1f40,%edi
call   1040 <htons@plt>
mov    %eax,-0x14(%rbp)
lea    -0x18(%rbp),%rsi
lea    0xe0a(%rip),%rdi
call   1060 <inet_aton@plt>
mov    -0x8(%rbp),%edi
lea    -0x18(%rbp),%rsi
mov    $0xc,%edx
call   1070 <connect@plt>
cmp    $0x0,%rax
jge    1269 <main+0xf9>
mov    0x2d9d(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x24(%rbp)
mov    0x2d89(%rip),%rax
mov    (%rax),%edi
call   1080 <strerror@plt>
mov    -0x24(%rbp),%edi
mov    %rax,%rdx
lea    0xdcd(%rip),%rsi
call   1050 <fprintf@plt>
mov    0x2d61(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
jmp    12d4 <main+0x164>
movl   $0x2a,-0x1c(%rbp)
mov    -0x8(%rbp),%edi
lea    -0x1c(%rbp),%rsi
mov    $0x4,%edx
call   1030 <write@plt>
cmp    $0x0,%rax
jge    12c8 <main+0x158>
mov    0x2d3e(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x28(%rbp)
mov    0x2d2a(%rip),%rax
mov    (%rax),%edi
call   1080 <strerror@plt>
mov    -0x28(%rbp),%edi
mov    %rax,%rdx
lea    0xd85(%rip),%rsi
call   1050 <fprintf@plt>
mov    0x2d02(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
jmp    12d4 <main+0x164>
mov    0x2ce9(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
sub    $0x18,%rsp
mov    0x2e6a(%rip),%r14
mov    (%r14),%edi
mov    0x2e58(%rip),%rax
mov    (%rax),%esi
mov    0x2e17(%rip),%rax
mov    (%rax),%edx
call   1090 <socket@plt>
test   %eax,%eax
js     1202 <main+0x92>
mov    %eax,%ebx
mov    (%r14),%eax
mov    %eax,0x10(%rsp)
mov    $0x1f40,%edi
call   1040 <htons@plt>
mov    %eax,0xc(%rsp)
lea    0xe5c(%rip),%rdi
lea    0x8(%rsp),%r14
mov    %r14,%rsi
call   1060 <inet_aton@plt>
mov    %ebx,%edi
mov    %r14,%rsi
mov    $0xc,%edx
call   1070 <connect@plt>
test   %rax,%rax
js     1222 <main+0xb2>
movl   $0x2a,0x4(%rsp)
lea    0x4(%rsp),%rsi
mov    %ebx,%edi
mov    $0x4,%edx
call   1030 <write@plt>
test   %rax,%rax
js     1242 <main+0xd2>
mov    0x2db8(%rip),%rax
jmp    1271 <main+0x101>
mov    0x2dc7(%rip),%rax
mov    (%rax),%ebx
mov    0x2db6(%rip),%rax
mov    (%rax),%edi
call   1080 <strerror@plt>
lea    0xde0(%rip),%rsi
jmp    1260 <main+0xf0>
mov    0x2da7(%rip),%rax
mov    (%rax),%ebx
mov    0x2d96(%rip),%rax
mov    (%rax),%edi
call   1080 <strerror@plt>
lea    0xde0(%rip),%rsi
jmp    1260 <main+0xf0>
mov    0x2d87(%rip),%rax
mov    (%rax),%ebx
mov    0x2d76(%rip),%rax
mov    (%rax),%edi
call   1080 <strerror@plt>
lea    0xdd7(%rip),%rsi
mov    %ebx,%edi
mov    %rax,%rdx
call   1050 <fprintf@plt>
mov    0x2d4f(%rip),%rax
mov    (%rax),%eax
add    $0x18,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
%struct.sockaddr_in = type { i32, i32, i32 }
%struct.sockaddr = type { i32 }
@AF_INET = global i32 0
@SOCK_DGRAM = global i32 0
@IPPROTO_UDP = global i32 0
@stderr = global i32 0
@.str = [22 x i8] c"socket() failed: %s\0A.\00"
@errno = global i32 0
@EXIT_FAILURE = global i32 0
@.str.1 = [10 x i8] c"127.0.0.1\00"
@.str.2 = [23 x i8] c"connect() failed: %s\0A.\00"
@.str.3 = [21 x i8] c"write() failed: %s\0A.\00"
@EXIT_SUCCESS = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca %struct.sockaddr_in
%4 = alloca i32
store i32 0, i32* %1
%5 = load i32, i32* @AF_INET
%6 = load i32, i32* @SOCK_DGRAM
%7 = load i32, i32* @IPPROTO_UDP
%8 = call i32 @socket(i32 %5, i32 %6, i32 %7)
store i32 %8, i32* %2
%9 = icmp slt i32 %8, 0
br i1 %9, label %10, label %16
10: ; preds = %0
%11 = load i32, i32* @stderr
%12 = load i32, i32* @errno
%13 = call i8* @strerror(i32 %12)
%14 = call i32 @fprintf(i32 %11, i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0), i8* %13)
%15 = load i32, i32* @EXIT_FAILURE
store i32 %15, i32* %1
br label %45
16: ; preds = %0
%17 = load i32, i32* @AF_INET
%18 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i32 0, i32 2
store i32 %17, i32* %18
%19 = call i32 @htons(i32 8000)
%20 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i32 0, i32 1
store i32 %19, i32* %20
%21 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i32 0, i32 0
%22 = call i32 @inet_aton(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0), i32* %21)
%23 = load i32, i32* %2
%24 = bitcast %struct.sockaddr_in* %3 to %struct.sockaddr*
%25 = call i64 @connect(i32 %23, %struct.sockaddr* %24, i32 12)
%26 = icmp slt i64 %25, 0
br i1 %26, label %27, label %33
27: ; preds = %16
%28 = load i32, i32* @stderr
%29 = load i32, i32* @errno
%30 = call i8* @strerror(i32 %29)
%31 = call i32 @fprintf(i32 %28, i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.2, i64 0, i64 0), i8* %30)
%32 = load i32, i32* @EXIT_FAILURE
store i32 %32, i32* %1
br label %45
33: ; preds = %16
store i32 42, i32* %4
%34 = load i32, i32* %2
%35 = call i64 @write(i32 %34, i32* %4, i32 4)
%36 = icmp slt i64 %35, 0
br i1 %36, label %37, label %43
37: ; preds = %33
%38 = load i32, i32* @stderr
%39 = load i32, i32* @errno
%40 = call i8* @strerror(i32 %39)
%41 = call i32 @fprintf(i32 %38, i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.3, i64 0, i64 0), i8* %40)
%42 = load i32, i32* @EXIT_FAILURE
store i32 %42, i32* %1
br label %45
43: ; preds = %33
%44 = load i32, i32* @EXIT_SUCCESS
store i32 %44, i32* %1
br label %45
45: ; preds = %43, %37, %27, %10
%46 = load i32, i32* %1
ret i32 %46
}

LLVM IR (-O2):
%struct.sockaddr_in = type { i32, i32, i32 }
%struct.sockaddr = type { i32 }
@AF_INET = global i32 0
@SOCK_DGRAM = global i32 0
@IPPROTO_UDP = global i32 0
@stderr = global i32 0
@.str = [22 x i8] c"socket() failed: %s\0A.\00"
@errno = global i32 0
@EXIT_FAILURE = global i32 0
@.str.1 = [10 x i8] c"127.0.0.1\00"
@.str.2 = [23 x i8] c"connect() failed: %s\0A.\00"
@.str.3 = [21 x i8] c"write() failed: %s\0A.\00"
@EXIT_SUCCESS = global i32 0
define i32 @main() {
%1 = alloca %struct.sockaddr_in
%2 = alloca i32
%3 = load i32, i32* @AF_INET
%4 = load i32, i32* @SOCK_DGRAM
%5 = load i32, i32* @IPPROTO_UDP
%6 = tail call i32 @socket(i32 %3, i32 %4, i32 %5)
%7 = icmp slt i32 %6, 0
br i1 %7, label %8, label %14
8: ; preds = %0
%9 = load i32, i32* @stderr
%10 = load i32, i32* @errno
%11 = tail call i8* @strerror(i32 %10)
%12 = tail call i32 @fprintf(i32 %9, i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0), i8* %11)
%13 = load i32, i32* @EXIT_FAILURE
br label %45
14: ; preds = %0
%15 = bitcast %struct.sockaddr_in* %1 to i8*
%16 = load i32, i32* @AF_INET
%17 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %1, i64 0, i32 2
store i32 %16, i32* %17
%18 = tail call i32 @htons(i32 8000)
%19 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %1, i64 0, i32 1
store i32 %18, i32* %19
%20 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %1, i64 0, i32 0
%21 = call i32 @inet_aton(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0), i32* %20)
%22 = bitcast %struct.sockaddr_in* %1 to %struct.sockaddr*
%23 = call i64 @connect(i32 %6, %struct.sockaddr* %22, i32 12)
%24 = icmp slt i64 %23, 0
br i1 %24, label %25, label %31
25: ; preds = %14
%26 = load i32, i32* @stderr
%27 = load i32, i32* @errno
%28 = call i8* @strerror(i32 %27)
%29 = call i32 @fprintf(i32 %26, i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.2, i64 0, i64 0), i8* %28)
%30 = load i32, i32* @EXIT_FAILURE
br label %43
31: ; preds = %14
%32 = bitcast i32* %2 to i8*
store i32 42, i32* %2
%33 = call i64 @write(i32 %6, i32* %2, i32 4)
%34 = icmp slt i64 %33, 0
br i1 %34, label %35, label %40
35: ; preds = %31
%36 = load i32, i32* @stderr
%37 = load i32, i32* @errno
%38 = call i8* @strerror(i32 %37)
%39 = call i32 @fprintf(i32 %36, i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.3, i64 0, i64 0), i8* %38)
br label %40
40: ; preds = %31, %35
%41 = phi i32* [ @EXIT_FAILURE, %35 ], [ @EXIT_SUCCESS, %31 ]
%42 = load i32, i32* %41
br label %43
43: ; preds = %40, %25
%44 = phi i32 [ %30, %25 ], [ %42, %40 ]
br label %45
45: ; preds = %43, %8
%46 = phi i32 [ %13, %8 ], [ %44, %43 ]
ret i32 %46
}