#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*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/ *, char *, ...);
int /*<<< orphan*/ stderr;
int gpio_close(int gpio) {
  FILE *fd;
  fd = fopen("/sys/class/gpio/unexport", "w");
  if (fd == NULL) {
    fprintf(stderr, "Could not open unexport\n");
    return -1;
  }
  fprintf(fd, "%d", gpio);
  fclose(fd);
  return 0;
}


x86 assembly (clang, -O0):
<gpio_close>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x8(%rbp)
lea    0xebe(%rip),%rdi
lea    0xed0(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    1181 <gpio_close+0x51>
mov    0x2e7c(%rip),%rax
movslq (%rax),%rdi
lea    0xead(%rip),%rsi
mov    $0x0,%al
call   1040 <fprintf@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    11a6 <gpio_close+0x76>
mov    -0x10(%rbp),%rdi
mov    -0x8(%rbp),%edx
lea    0xea5(%rip),%rsi
mov    $0x0,%al
call   1040 <fprintf@plt>
mov    -0x10(%rbp),%rdi
call   1030 <fclose@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<gpio_close>:
push   %rbp
push   %r14
push   %rbx
mov    %edi,%r14d
lea    0xeb2(%rip),%rdi
lea    0xec4(%rip),%rsi
call   1050 <fopen@plt>
test   %rax,%rax
je     1182 <gpio_close+0x42>
mov    %rax,%rbx
lea    0xecb(%rip),%rsi
xor    %ebp,%ebp
mov    %rax,%rdi
mov    %r14d,%edx
xor    %eax,%eax
call   1040 <fprintf@plt>
mov    %rbx,%rdi
call   1030 <fclose@plt>
jmp    11a7 <gpio_close+0x67>
mov    0x2e57(%rip),%rax
movslq (%rax),%rcx
lea    0xe88(%rip),%rdi
mov    $0x18,%esi
mov    $0x1,%edx
call   1060 <fwrite@plt>
mov    $0xffffffff,%ebp
mov    %ebp,%eax
pop    %rbx
pop    %r14
pop    %rbp
ret

LLVM IR (-O0):
@.str = [25 x i8] c"/sys/class/gpio/unexport\00"
@.str.1 = [2 x i8] c"w\00"
@stderr = global i32 0
@.str.2 = [25 x i8] c"Could not open unexport\0A\00"
@.str.3 = [3 x i8] c"%d\00"
define i32 @gpio_close(i32 %0) {
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32*
store i32 %0, i32* %3
%5 = call i32* @fopen(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %5, i32** %4
%6 = load i32*, i32** %4
%7 = icmp eq i32* %6, null
br i1 %7, label %8, label %13
8: ; preds = %1
%9 = load i32, i32* @stderr
%10 = sext i32 %9 to i64
%11 = inttoptr i64 %10 to i32*
%12 = call i32 (i32*, i8*, ...) @fprintf(i32* %11, i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.2, i64 0, i64 0))
store i32 -1, i32* %2
br label %19
13: ; preds = %1
%14 = load i32*, i32** %4
%15 = load i32, i32* %3
%16 = call i32 (i32*, i8*, ...) @fprintf(i32* %14, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0), i32 %15)
%17 = load i32*, i32** %4
%18 = call i32 @fclose(i32* %17)
store i32 0, i32* %2
br label %19
19: ; preds = %13, %8
%20 = load i32, i32* %2
ret i32 %20
}

LLVM IR (-O2):
@.str = [25 x i8] c"/sys/class/gpio/unexport\00"
@.str.1 = [2 x i8] c"w\00"
@stderr = global i32 0
@.str.2 = [25 x i8] c"Could not open unexport\0A\00"
@.str.3 = [3 x i8] c"%d\00"
define i32 @gpio_close(i32 %0) {
%2 = tail call i32* @fopen(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%3 = icmp eq i32* %2, null
br i1 %3, label %4, label %9
4: ; preds = %1
%5 = load i32, i32* @stderr
%6 = sext i32 %5 to i64
%7 = inttoptr i64 %6 to i32*
%8 = tail call i64 @fwrite(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.2, i64 0, i64 0), i64 24, i64 1, i32* %7)
br label %12
9: ; preds = %1
%10 = tail call i32 (i32*, i8*, ...) @fprintf(i32* %2, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0), i32 %0)
%11 = tail call i32 @fclose(i32* %2)
br label %12
12: ; preds = %9, %4
%13 = phi i32 [ -1, %4 ], [ 0, %9 ]
ret i32 %13
}