#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 */

/* Variables and functions */
scalar_t__ EACCES;
scalar_t__ EAGAIN;
int /*<<< orphan*/ LOG_ERR;
int O_CREAT;
int O_RDWR;
int S_IRGRP;
int S_IROTH;
int S_IRUSR;
int S_IWUSR;
int /*<<< orphan*/ close(int);
scalar_t__ errno;
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ ftruncate(int, int /*<<< orphan*/);
scalar_t__ getpid();
int lockfile(int);
int open(char const *, int, int);
int /*<<< orphan*/ sprintf(char *, char *, long);
scalar_t__ strlen(char *);
int /*<<< orphan*/ syslog(int /*<<< orphan*/, char *, char const *);
int /*<<< orphan*/ write(int, char *, scalar_t__);
int already_running(const char *filename) {
  int fd;
  char buf[16];
  fd =
      open(filename, O_RDWR | O_CREAT, (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH));
  if (fd < 0) {
    syslog(LOG_ERR, "can't open %s: %m\n", filename);
    exit(1);
  }
  if (lockfile(fd) == -1) {
    if (errno == EACCES || errno == EAGAIN) {
      syslog(LOG_ERR, "file: %s already locked", filename);
      close(fd);
      return 1;
    }
    syslog(LOG_ERR, "can't lock %s: %m\n", filename);
    exit(1);
  }
  ftruncate(fd, 0);
  sprintf(buf, "%ld", (long)getpid());
  write(fd, buf, strlen(buf) + 1);
  return 0;
}


x86 assembly (clang, -O0):
<already_running>:
push   %rbp
mov    %rsp,%rbp
sub    $0x50,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
mov    0x2e29(%rip),%rax
mov    (%rax),%esi
mov    0x2e38(%rip),%rax
or     (%rax),%esi
mov    0x2ddf(%rip),%rax
mov    (%rax),%edx
mov    0x2e06(%rip),%rax
or     (%rax),%edx
mov    0x2ddd(%rip),%rax
or     (%rax),%edx
mov    0x2dcc(%rip),%rax
or     (%rax),%edx
call   10a0 <open@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    121b <already_running+0x7b>
mov    0x2d99(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rdx
lea    0xdf4(%rip),%rsi
call   1080 <syslog@plt>
mov    $0x1,%edi
call   10c0 <exit@plt>
mov    -0x14(%rbp),%edi
call   1090 <lockfile@plt>
cmp    $0xffffffff,%eax
jne    12b0 <already_running+0x110>
mov    0x2d8d(%rip),%rax
mov    (%rax),%rax
mov    0x2d93(%rip),%rcx
cmp    (%rcx),%rax
je     1260 <already_running+0xc0>
mov    0x2d73(%rip),%rax
mov    (%rax),%rax
mov    0x2d39(%rip),%rcx
cmp    (%rcx),%rax
jne    128d <already_running+0xed>
mov    0x2d31(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rdx
lea    0xd9f(%rip),%rsi
call   1080 <syslog@plt>
mov    -0x14(%rbp),%edi
call   1070 <close@plt>
movl   $0x1,-0x4(%rbp)
jmp    130d <already_running+0x16d>
mov    0x2d04(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rdx
lea    0xd8a(%rip),%rsi
call   1080 <syslog@plt>
mov    $0x1,%edi
call   10c0 <exit@plt>
mov    -0x14(%rbp),%edi
xor    %esi,%esi
call   1060 <ftruncate@plt>
lea    -0x30(%rbp),%rax
mov    %rax,-0x48(%rbp)
mov    $0x0,%al
call   1040 <getpid@plt>
mov    -0x48(%rbp),%rdi
mov    %rax,%rdx
lea    0xd67(%rip),%rsi
call   10b0 <sprintf@plt>
mov    -0x14(%rbp),%eax
mov    %eax,-0x3c(%rbp)
lea    -0x30(%rbp),%rax
mov    %rax,-0x38(%rbp)
lea    -0x30(%rbp),%rdi
call   1050 <strlen@plt>
mov    -0x3c(%rbp),%edi
mov    -0x38(%rbp),%rsi
mov    %rax,%rdx
add    $0x1,%rdx
call   1030 <write@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x50,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<already_running>:
push   %rbp
push   %r14
push   %rbx
sub    $0x10,%rsp
mov    0x2e31(%rip),%rax
mov    0x2e42(%rip),%rcx
mov    (%rcx),%esi
or     (%rax),%esi
mov    0x2de7(%rip),%rax
mov    0x2e10(%rip),%rcx
mov    (%rcx),%edx
or     (%rax),%edx
mov    0x2de5(%rip),%rax
or     (%rax),%edx
mov    %rdi,%r14
mov    0x2dd1(%rip),%rax
or     (%rax),%edx
call   10a0 <open@plt>
test   %eax,%eax
js     128c <already_running+0xec>
mov    %eax,%ebx
mov    %eax,%edi
call   1090 <lockfile@plt>
cmp    $0xffffffff,%eax
je     123b <already_running+0x9b>
xor    %ebp,%ebp
mov    %ebx,%edi
xor    %esi,%esi
call   1060 <ftruncate@plt>
xor    %eax,%eax
call   1040 <getpid@plt>
lea    0xe29(%rip),%rsi
mov    %rsp,%r14
mov    %r14,%rdi
mov    %rax,%rdx
call   10b0 <sprintf@plt>
mov    %r14,%rdi
call   1050 <strlen@plt>
lea    0x1(%rax),%rdx
mov    %ebx,%edi
mov    %r14,%rsi
call   1030 <write@plt>
jmp    1281 <already_running+0xe1>
mov    0x2d7e(%rip),%rax
mov    (%rax),%rax
mov    0x2d84(%rip),%rcx
mov    0x2d45(%rip),%rdx
mov    (%rdx),%edi
cmp    (%rcx),%rax
je     1266 <already_running+0xc6>
mov    0x2d2f(%rip),%rcx
cmp    (%rcx),%rax
jne    129e <already_running+0xfe>
lea    0xda6(%rip),%rsi
mov    %r14,%rdx
call   1080 <syslog@plt>
mov    %ebx,%edi
call   1070 <close@plt>
mov    $0x1,%ebp
mov    %ebp,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %rbp
ret
mov    0x2d05(%rip),%rax
mov    (%rax),%edi
lea    0xd64(%rip),%rsi
jmp    12a5 <already_running+0x105>
lea    0xd86(%rip),%rsi
mov    %r14,%rdx
call   1080 <syslog@plt>
mov    $0x1,%edi
call   10c0 <exit@plt>

LLVM IR (-O0):
@O_RDWR = global i32 0
@O_CREAT = global i32 0
@S_IRUSR = global i32 0
@S_IWUSR = global i32 0
@S_IRGRP = global i32 0
@S_IROTH = global i32 0
@LOG_ERR = global i32 0
@.str = [19 x i8] c"can't open %s: %m\0A\00"
@errno = global i64 0
@EACCES = global i64 0
@EAGAIN = global i64 0
@.str.1 = [24 x i8] c"file: %s already locked\00"
@.str.2 = [19 x i8] c"can't lock %s: %m\0A\00"
@.str.3 = [4 x i8] c"%ld\00"
define i32 @already_running(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i32
%5 = alloca [16 x i8]
store i8* %0, i8** %3
%6 = load i8*, i8** %3
%7 = load i32, i32* @O_RDWR
%8 = load i32, i32* @O_CREAT
%9 = or i32 %7, %8
%10 = load i32, i32* @S_IRUSR
%11 = load i32, i32* @S_IWUSR
%12 = or i32 %10, %11
%13 = load i32, i32* @S_IRGRP
%14 = or i32 %12, %13
%15 = load i32, i32* @S_IROTH
%16 = or i32 %14, %15
%17 = call i32 @open(i8* %6, i32 %9, i32 %16)
store i32 %17, i32* %4
%18 = load i32, i32* %4
%19 = icmp slt i32 %18, 0
br i1 %19, label %20, label %25
20: ; preds = %1
%21 = load i32, i32* @LOG_ERR
%22 = load i8*, i8** %3
%23 = call i32 @syslog(i32 %21, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0), i8* %22)
%24 = call i32 @exit(i32 1)
unreachable
25: ; preds = %1
%26 = load i32, i32* %4
%27 = call i32 @lockfile(i32 %26)
%28 = icmp eq i32 %27, -1
br i1 %28, label %29, label %48
29: ; preds = %25
%30 = load i64, i64* @errno
%31 = load i64, i64* @EACCES
%32 = icmp eq i64 %30, %31
br i1 %32, label %37, label %33
33: ; preds = %29
%34 = load i64, i64* @errno
%35 = load i64, i64* @EAGAIN
%36 = icmp eq i64 %34, %35
br i1 %36, label %37, label %43
37: ; preds = %33, %29
%38 = load i32, i32* @LOG_ERR
%39 = load i8*, i8** %3
%40 = call i32 @syslog(i32 %38, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.1, i64 0, i64 0), i8* %39)
%41 = load i32, i32* %4
%42 = call i32 @close(i32 %41)
store i32 1, i32* %2
br label %60
43: ; preds = %33
%44 = load i32, i32* @LOG_ERR
%45 = load i8*, i8** %3
%46 = call i32 @syslog(i32 %44, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0), i8* %45)
%47 = call i32 @exit(i32 1)
unreachable
48: ; preds = %25
%49 = load i32, i32* %4
%50 = call i32 @ftruncate(i32 %49, i32 0)
%51 = getelementptr inbounds [16 x i8], [16 x i8]* %5, i64 0, i64 0
%52 = call i64 (...) @getpid()
%53 = call i32 @sprintf(i8* %51, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i64 %52)
%54 = load i32, i32* %4
%55 = getelementptr inbounds [16 x i8], [16 x i8]* %5, i64 0, i64 0
%56 = getelementptr inbounds [16 x i8], [16 x i8]* %5, i64 0, i64 0
%57 = call i64 @strlen(i8* %56)
%58 = add nsw i64 %57, 1
%59 = call i32 @write(i32 %54, i8* %55, i64 %58)
store i32 0, i32* %2
br label %60
60: ; preds = %48, %37
%61 = load i32, i32* %2
ret i32 %61
}

LLVM IR (-O2):
@O_RDWR = global i32 0
@O_CREAT = global i32 0
@S_IRUSR = global i32 0
@S_IWUSR = global i32 0
@S_IRGRP = global i32 0
@S_IROTH = global i32 0
@LOG_ERR = global i32 0
@.str = [19 x i8] c"can't open %s: %m\0A\00"
@errno = global i64 0
@EACCES = global i64 0
@EAGAIN = global i64 0
@.str.1 = [24 x i8] c"file: %s already locked\00"
@.str.2 = [19 x i8] c"can't lock %s: %m\0A\00"
@.str.3 = [4 x i8] c"%ld\00"
define i32 @already_running(i8* %0) {
%2 = alloca [16 x i8]
%3 = getelementptr inbounds [16 x i8], [16 x i8]* %2, i64 0, i64 0
%4 = load i32, i32* @O_RDWR
%5 = load i32, i32* @O_CREAT
%6 = or i32 %5, %4
%7 = load i32, i32* @S_IRUSR
%8 = load i32, i32* @S_IWUSR
%9 = or i32 %8, %7
%10 = load i32, i32* @S_IRGRP
%11 = or i32 %9, %10
%12 = load i32, i32* @S_IROTH
%13 = or i32 %11, %12
%14 = tail call i32 @open(i8* %0, i32 %6, i32 %13)
%15 = icmp slt i32 %14, 0
br i1 %15, label %16, label %20
16: ; preds = %1
%17 = load i32, i32* @LOG_ERR
%18 = tail call i32 @syslog(i32 %17, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0), i8* %0)
%19 = tail call i32 @exit(i32 1)
unreachable
20: ; preds = %1
%21 = tail call i32 @lockfile(i32 %14)
%22 = icmp eq i32 %21, -1
br i1 %22, label %23, label %37
23: ; preds = %20
%24 = load i64, i64* @errno
%25 = load i64, i64* @EACCES
%26 = icmp eq i64 %24, %25
%27 = load i64, i64* @EAGAIN
%28 = icmp eq i64 %24, %27
%29 = select i1 %26, i1 true, i1 %28
%30 = load i32, i32* @LOG_ERR
br i1 %29, label %31, label %34
31: ; preds = %23
%32 = tail call i32 @syslog(i32 %30, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.1, i64 0, i64 0), i8* %0)
%33 = tail call i32 @close(i32 %14)
br label %44
34: ; preds = %23
%35 = tail call i32 @syslog(i32 %30, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0), i8* %0)
%36 = tail call i32 @exit(i32 1)
unreachable
37: ; preds = %20
%38 = tail call i32 @ftruncate(i32 %14, i32 0)
%39 = tail call i64 (...) @getpid()
%40 = call i32 @sprintf(i8* %3, i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i64 %39)
%41 = call i64 @strlen(i8* %3)
%42 = add nsw i64 %41, 1
%43 = call i32 @write(i32 %14, i8* %3, i64 %42)
br label %44
44: ; preds = %37, %31
%45 = phi i32 [ 1, %31 ], [ 0, %37 ]
ret i32 %45
}