#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*/ addr;

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int EXIT_FAILURE;
int EXIT_SUCCESS;
int /*<<< orphan*/ IPPROTO_UDP;
int /*<<< orphan*/ O_RDONLY;
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 open(char *, int /*<<< orphan*/);
scalar_t__ sendfile(int, int, int /*<<< orphan*/ *, int);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int /*<<< orphan*/ stderr;
char *strerror(int /*<<< orphan*/);
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 fd = open("./c_programs/sendfile_dgram.c", O_RDONLY);
  if (sendfile(sock, fd, NULL, 10) < 0) {
    fprintf(stderr, "sendfile() 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    0x2e52(%rip),%rax
mov    (%rax),%edi
mov    0x2e39(%rip),%rax
mov    (%rax),%esi
mov    0x2df8(%rip),%rax
mov    (%rax),%edx
call   10a0 <socket@plt>
mov    %eax,-0x8(%rbp)
cmp    $0x0,%eax
jge    11f8 <main+0x78>
mov    0x2e06(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x20(%rbp)
mov    0x2df2(%rip),%rax
mov    (%rax),%edi
call   1090 <strerror@plt>
mov    -0x20(%rbp),%edi
mov    %rax,%rdx
lea    0xe1e(%rip),%rsi
call   1040 <fprintf@plt>
mov    0x2dca(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
jmp    12f8 <main+0x178>
mov    0x2de9(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x10(%rbp)
mov    $0x1f40,%edi
call   1030 <htons@plt>
mov    %eax,-0x14(%rbp)
lea    -0x18(%rbp),%rsi
lea    0xdfa(%rip),%rdi
call   1050 <inet_aton@plt>
mov    -0x8(%rbp),%edi
lea    -0x18(%rbp),%rsi
mov    $0xc,%edx
call   1080 <connect@plt>
cmp    $0x0,%rax
jge    1279 <main+0xf9>
mov    0x2d85(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x24(%rbp)
mov    0x2d71(%rip),%rax
mov    (%rax),%edi
call   1090 <strerror@plt>
mov    -0x24(%rbp),%edi
mov    %rax,%rdx
lea    0xdbd(%rip),%rsi
call   1040 <fprintf@plt>
mov    0x2d49(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
jmp    12f8 <main+0x178>
mov    0x2d60(%rip),%rax
mov    (%rax),%esi
lea    0xdae(%rip),%rdi
call   1070 <open@plt>
mov    %eax,-0x1c(%rbp)
mov    -0x8(%rbp),%edi
mov    -0x1c(%rbp),%esi
xor    %eax,%eax
mov    %eax,%edx
mov    $0xa,%ecx
call   1060 <sendfile@plt>
cmp    $0x0,%rax
jge    12ec <main+0x16c>
mov    0x2d12(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x28(%rbp)
mov    0x2cfe(%rip),%rax
mov    (%rax),%edi
call   1090 <strerror@plt>
mov    -0x28(%rbp),%edi
mov    %rax,%rdx
lea    0xd7f(%rip),%rsi
call   1040 <fprintf@plt>
mov    0x2cd6(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
jmp    12f8 <main+0x178>
mov    0x2cbd(%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   %rbp
push   %r14
push   %rbx
sub    $0x10,%rsp
mov    0x2e59(%rip),%rbp
mov    0x0(%rbp),%edi
mov    0x2e3f(%rip),%rax
mov    (%rax),%esi
mov    0x2dfe(%rip),%rax
mov    (%rax),%edx
call   10a0 <socket@plt>
test   %eax,%eax
js     121d <main+0x9d>
mov    %eax,%ebx
mov    0x0(%rbp),%eax
mov    %eax,0x8(%rsp)
mov    $0x1f40,%edi
call   1030 <htons@plt>
mov    %eax,0x4(%rsp)
lea    0xe4b(%rip),%rdi
mov    %rsp,%r14
mov    %r14,%rsi
call   1050 <inet_aton@plt>
mov    %ebx,%edi
mov    %r14,%rsi
mov    $0xc,%edx
call   1080 <connect@plt>
test   %rax,%rax
js     123f <main+0xbf>
mov    0x2def(%rip),%rax
mov    (%rax),%esi
lea    0xe3d(%rip),%rdi
call   1070 <open@plt>
mov    %ebx,%edi
mov    %eax,%esi
xor    %edx,%edx
mov    $0xa,%ecx
call   1060 <sendfile@plt>
test   %rax,%rax
js     1248 <main+0xc8>
mov    0x2d95(%rip),%rax
jmp    127a <main+0xfa>
mov    0x2da4(%rip),%rax
mov    (%rax),%ebx
mov    0x2d93(%rip),%rax
mov    (%rax),%edi
call   1090 <strerror@plt>
lea    0xdc5(%rip),%rsi
mov    %ebx,%edi
jmp    126b <main+0xeb>
lea    0xdda(%rip),%rbx
jmp    124f <main+0xcf>
lea    0xe06(%rip),%rbx
mov    0x2d72(%rip),%rax
mov    (%rax),%ebp
mov    0x2d61(%rip),%rax
mov    (%rax),%edi
call   1090 <strerror@plt>
mov    %ebp,%edi
mov    %rbx,%rsi
mov    %rax,%rdx
call   1040 <fprintf@plt>
mov    0x2d3e(%rip),%rax
mov    (%rax),%eax
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %rbp
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 = [30 x i8] c"./c_programs/sendfile_dgram.c\00"
@O_RDONLY = global i32 0
@.str.4 = [24 x i8] c"sendfile() 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 %48
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 %48
33: ; preds = %16
%34 = load i32, i32* @O_RDONLY
%35 = call i32 @open(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.3, i64 0, i64 0), i32 %34)
store i32 %35, i32* %4
%36 = load i32, i32* %2
%37 = load i32, i32* %4
%38 = call i64 @sendfile(i32 %36, i32 %37, i32* null, i32 10)
%39 = icmp slt i64 %38, 0
br i1 %39, label %40, label %46
40: ; preds = %33
%41 = load i32, i32* @stderr
%42 = load i32, i32* @errno
%43 = call i8* @strerror(i32 %42)
%44 = call i32 @fprintf(i32 %41, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.4, i64 0, i64 0), i8* %43)
%45 = load i32, i32* @EXIT_FAILURE
store i32 %45, i32* %1
br label %48
46: ; preds = %33
%47 = load i32, i32* @EXIT_SUCCESS
store i32 %47, i32* %1
br label %48
48: ; preds = %46, %40, %27, %10
%49 = load i32, i32* %1
ret i32 %49
}

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