#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 */
typedef int /*<<< orphan*/ buf;

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int EXIT_FAILURE;
int EXIT_SUCCESS;
int /*<<< orphan*/ F_SETFL;
int /*<<< orphan*/ IPPROTO_UDP;
int /*<<< orphan*/ O_NONBLOCK;
int /*<<< orphan*/ SOCK_DGRAM;
int /*<<< orphan*/ errno;
int /*<<< orphan*/ fcntl(int, int /*<<< orphan*/, int /*<<< orphan*/);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int read(int, char **, 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);
  }
  fcntl(sock, F_SETFL, O_NONBLOCK);
  char buf[42];
  if (read(sock, &buf, sizeof(buf)) != -1)
    return (EXIT_FAILURE);
  return (EXIT_SUCCESS);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x50,%rsp
movl   $0x0,-0x4(%rbp)
mov    0x2e82(%rip),%rax
mov    (%rax),%edi
mov    0x2e69(%rip),%rax
mov    (%rax),%esi
mov    0x2e20(%rip),%rax
mov    (%rax),%edx
call   1070 <socket@plt>
mov    %eax,-0x8(%rbp)
cmp    $0x0,%eax
jge    11c8 <main+0x78>
mov    0x2e36(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x44(%rbp)
mov    0x2e1a(%rip),%rax
mov    (%rax),%edi
call   1060 <strerror@plt>
mov    -0x44(%rbp),%edi
mov    %rax,%rdx
lea    0xe4e(%rip),%rsi
call   1050 <fprintf@plt>
mov    0x2df2(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
jmp    1219 <main+0xc9>
mov    -0x8(%rbp),%edi
mov    0x2dee(%rip),%rax
mov    (%rax),%esi
mov    0x2e05(%rip),%rax
mov    (%rax),%edx
call   1030 <fcntl@plt>
mov    -0x8(%rbp),%edi
lea    -0x40(%rbp),%rsi
mov    $0x2a,%edx
call   1040 <read@plt>
cmp    $0xffffffff,%eax
je     120d <main+0xbd>
mov    0x2dad(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
jmp    1219 <main+0xc9>
mov    0x2d94(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x50,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x30,%rsp
mov    0x2e8c(%rip),%rax
mov    (%rax),%edi
mov    0x2e73(%rip),%rax
mov    (%rax),%esi
mov    0x2e2a(%rip),%rax
mov    (%rax),%edx
call   1070 <socket@plt>
test   %eax,%eax
js     11b1 <main+0x61>
mov    %eax,%ebx
mov    0x2e3e(%rip),%rax
mov    (%rax),%esi
mov    0x2e55(%rip),%rax
mov    (%rax),%edx
mov    %ebx,%edi
call   1030 <fcntl@plt>
mov    %rsp,%rsi
mov    %ebx,%edi
mov    $0x2a,%edx
call   1040 <read@plt>
cmp    $0xffffffff,%eax
jne    11d9 <main+0x89>
mov    0x2df9(%rip),%rax
jmp    11e0 <main+0x90>
mov    0x2e10(%rip),%rax
mov    (%rax),%ebx
mov    0x2df7(%rip),%rax
mov    (%rax),%edi
call   1060 <strerror@plt>
lea    0xe31(%rip),%rsi
mov    %ebx,%edi
mov    %rax,%rdx
call   1050 <fprintf@plt>
mov    0x2dd0(%rip),%rax
mov    (%rax),%eax
add    $0x30,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@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
@F_SETFL = global i32 0
@O_NONBLOCK = global i32 0
@EXIT_SUCCESS = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca [42 x i8]
store i32 0, i32* %1
%4 = load i32, i32* @AF_INET
%5 = load i32, i32* @SOCK_DGRAM
%6 = load i32, i32* @IPPROTO_UDP
%7 = call i32 @socket(i32 %4, i32 %5, i32 %6)
store i32 %7, i32* %2
%8 = icmp slt i32 %7, 0
br i1 %8, label %9, label %15
9: ; preds = %0
%10 = load i32, i32* @stderr
%11 = load i32, i32* @errno
%12 = call i8* @strerror(i32 %11)
%13 = call i32 @fprintf(i32 %10, i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0), i8* %12)
%14 = load i32, i32* @EXIT_FAILURE
store i32 %14, i32* %1
br label %28
15: ; preds = %0
%16 = load i32, i32* %2
%17 = load i32, i32* @F_SETFL
%18 = load i32, i32* @O_NONBLOCK
%19 = call i32 @fcntl(i32 %16, i32 %17, i32 %18)
%20 = load i32, i32* %2
%21 = bitcast [42 x i8]* %3 to i8**
%22 = call i32 @read(i32 %20, i8** %21, i32 42)
%23 = icmp ne i32 %22, -1
br i1 %23, label %24, label %26
24: ; preds = %15
%25 = load i32, i32* @EXIT_FAILURE
store i32 %25, i32* %1
br label %28
26: ; preds = %15
%27 = load i32, i32* @EXIT_SUCCESS
store i32 %27, i32* %1
br label %28
28: ; preds = %26, %24, %9
%29 = load i32, i32* %1
ret i32 %29
}

LLVM IR (-O2):
@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
@F_SETFL = global i32 0
@O_NONBLOCK = global i32 0
@EXIT_SUCCESS = global i32 0
define i32 @main() {
%1 = alloca [42 x i8]
%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 %24
13: ; preds = %0
%14 = load i32, i32* @F_SETFL
%15 = load i32, i32* @O_NONBLOCK
%16 = tail call i32 @fcntl(i32 %5, i32 %14, i32 %15)
%17 = getelementptr inbounds [42 x i8], [42 x i8]* %1, i64 0, i64 0
%18 = bitcast [42 x i8]* %1 to i8**
%19 = call i32 @read(i32 %5, i8** %18, i32 42)
%20 = icmp eq i32 %19, -1
%21 = load i32, i32* @EXIT_SUCCESS
%22 = load i32, i32* @EXIT_FAILURE
%23 = select i1 %20, i32 %21, i32 %22
br label %24
24: ; preds = %13, %7
%25 = phi i32 [ %12, %7 ], [ %23, %13 ]
ret i32 %25
}