#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 const *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/ *, char *, int);
scalar_t__ getpid();
int write_pid_to_file(const char *file_path) {
  FILE *fp;
  fp = fopen(file_path, "w");
  if (fp != NULL) {
    fprintf(fp, "%d\n", (int)getpid());
    fclose(fp);
  } else {
    return -1;
  }
  return 0;
}


x86 assembly (clang, -O0):
<write_pid_to_file>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xea9(%rip),%rsi
call   1060 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
je     119a <write_pid_to_file+0x5a>
mov    -0x18(%rbp),%rax
mov    %rax,-0x20(%rbp)
mov    $0x0,%al
call   1030 <getpid@plt>
mov    -0x20(%rbp),%rdi
mov    %eax,%edx
lea    0xe7b(%rip),%rsi
call   1050 <fprintf@plt>
mov    -0x18(%rbp),%rdi
call   1040 <fclose@plt>
jmp    11a6 <write_pid_to_file+0x66>
movl   $0xffffffff,-0x4(%rbp)
jmp    11ad <write_pid_to_file+0x6d>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<write_pid_to_file>:
push   %rbp
push   %rbx
push   %rax
lea    0xeb6(%rip),%rsi
call   1060 <fopen@plt>
test   %rax,%rax
je     117b <write_pid_to_file+0x3b>
mov    %rax,%rbx
xor    %ebp,%ebp
xor    %eax,%eax
call   1030 <getpid@plt>
lea    0xe9b(%rip),%rsi
mov    %rbx,%rdi
mov    %eax,%edx
call   1050 <fprintf@plt>
mov    %rbx,%rdi
call   1040 <fclose@plt>
jmp    1180 <write_pid_to_file+0x40>
mov    $0xffffffff,%ebp
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [2 x i8] c"w\00"
@.str.1 = [4 x i8] c"%d\0A\00"
define i32 @write_pid_to_file(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i32*
store i8* %0, i8** %3
%5 = load i8*, i8** %3
%6 = call i32* @fopen(i8* %5, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %6, i32** %4
%7 = load i32*, i32** %4
%8 = icmp ne i32* %7, null
br i1 %8, label %9, label %16
9: ; preds = %1
%10 = load i32*, i32** %4
%11 = call i64 (...) @getpid()
%12 = trunc i64 %11 to i32
%13 = call i32 @fprintf(i32* %10, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %12)
%14 = load i32*, i32** %4
%15 = call i32 @fclose(i32* %14)
br label %17
16: ; preds = %1
store i32 -1, i32* %2
br label %18
17: ; preds = %9
store i32 0, i32* %2
br label %18
18: ; preds = %17, %16
%19 = load i32, i32* %2
ret i32 %19
}

LLVM IR (-O2):
@.str = [2 x i8] c"w\00"
@.str.1 = [4 x i8] c"%d\0A\00"
define i32 @write_pid_to_file(i8* nocapture %0) {
%2 = tail call i32* @fopen(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%3 = icmp eq i32* %2, null
br i1 %3, label %9, label %4
4: ; preds = %1
%5 = tail call i64 (...) @getpid()
%6 = trunc i64 %5 to i32
%7 = tail call i32 @fprintf(i32* %2, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %6)
%8 = tail call i32 @fclose(i32* %2)
br label %9
9: ; preds = %1, %4
%10 = phi i32 [ 0, %4 ], [ -1, %1 ]
ret i32 %10
}