#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 /*<<< orphan*/ LOG_INFO;
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();
scalar_t__ lockfile(int);
int open(char *, int, int);
int /*<<< orphan*/ sprintf(char *, char *, long);
scalar_t__ strlen(char *);
int /*<<< orphan*/ syslog(int /*<<< orphan*/, char *, ...);
int /*<<< orphan*/ write(int, char *, scalar_t__);
int already_running(void) {
  int fd;
  char buf[16];
  fd = open("/var/run/daemon.pid", O_RDWR | O_CREAT,
            (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH));
  if (fd < 0) {
    syslog(LOG_ERR, "can't open %s: %m", "/var/run/daemon.pid");
    exit(1);
  }
  if (lockfile(fd) < 0) {
    if (errno == EACCES || errno == EAGAIN) {
      syslog(LOG_INFO, "%ld has running instance, (%m), exiting..",
             (long)getpid());
      close(fd);
      return 1;
    }
    syslog(LOG_ERR, "can't lock %s: %m", "/var/run/daemon.pid");
    exit(1);
  }
  ftruncate(fd, 0);
  sprintf(buf, "%ld", (long)getpid());
  write(fd, buf, strlen(buf) + 1);
  syslog(LOG_INFO, "first instance of daemon, allow running!");
  return 0;
}


x86 assembly (clang, -O0):
<already_running>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
mov    0x2e31(%rip),%rax
mov    (%rax),%esi
mov    0x2e40(%rip),%rax
or     (%rax),%esi
mov    0x2de7(%rip),%rax
mov    (%rax),%edx
mov    0x2e0e(%rip),%rax
or     (%rax),%edx
mov    0x2de5(%rip),%rax
or     (%rax),%edx
mov    0x2dd4(%rip),%rax
or     (%rax),%edx
lea    0xe1b(%rip),%rdi
call   10a0 <open@plt>
mov    %eax,-0x8(%rbp)
cmpl   $0x0,-0x8(%rbp)
jge    121f <already_running+0x7f>
mov    0x2d92(%rip),%rax
mov    (%rax),%edi
lea    0xe0d(%rip),%rsi
lea    0xdf2(%rip),%rdx
mov    $0x0,%al
call   1080 <syslog@plt>
mov    $0x1,%edi
call   10c0 <exit@plt>
mov    -0x8(%rbp),%edi
call   1090 <lockfile@plt>
cmp    $0x0,%rax
jge    12c8 <already_running+0x128>
mov    0x2d88(%rip),%rax
mov    (%rax),%rax
mov    0x2d8e(%rip),%rcx
cmp    (%rcx),%rax
je     1265 <already_running+0xc5>
mov    0x2d6e(%rip),%rax
mov    (%rax),%rax
mov    0x2d2c(%rip),%rcx
cmp    (%rcx),%rax
jne    12a0 <already_running+0x100>
mov    0x2d34(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x24(%rbp)
mov    $0x0,%al
call   1040 <getpid@plt>
mov    -0x24(%rbp),%edi
mov    %rax,%rdx
lea    0xda1(%rip),%rsi
mov    $0x0,%al
call   1080 <syslog@plt>
mov    -0x8(%rbp),%edi
call   1070 <close@plt>
movl   $0x1,-0x4(%rbp)
jmp    133c <already_running+0x19c>
mov    0x2ce9(%rip),%rax
mov    (%rax),%edi
lea    0xda0(%rip),%rsi
lea    0xd49(%rip),%rdx
mov    $0x0,%al
call   1080 <syslog@plt>
mov    $0x1,%edi
call   10c0 <exit@plt>
mov    -0x8(%rbp),%edi
xor    %esi,%esi
call   1060 <ftruncate@plt>
lea    -0x20(%rbp),%rax
mov    %rax,-0x40(%rbp)
mov    $0x0,%al
call   1040 <getpid@plt>
mov    -0x40(%rbp),%rdi
mov    %rax,%rdx
lea    0xd73(%rip),%rsi
call   10b0 <sprintf@plt>
mov    -0x8(%rbp),%eax
mov    %eax,-0x34(%rbp)
lea    -0x20(%rbp),%rax
mov    %rax,-0x30(%rbp)
lea    -0x20(%rbp),%rdi
call   1050 <strlen@plt>
mov    -0x34(%rbp),%edi
mov    -0x30(%rbp),%rsi
mov    %rax,%rdx
add    $0x1,%rdx
call   1030 <write@plt>
mov    0x2c7b(%rip),%rax
mov    (%rax),%edi
lea    0xd38(%rip),%rsi
mov    $0x0,%al
call   1080 <syslog@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x40,%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    0x2dd4(%rip),%rax
or     (%rax),%edx
lea    0xe1b(%rip),%rdi
call   10a0 <open@plt>
test   %eax,%eax
js     12b5 <already_running+0x115>
mov    %eax,%ebx
mov    %eax,%edi
call   1090 <lockfile@plt>
test   %rax,%rax
js     1257 <already_running+0xb7>
xor    %r14d,%r14d
mov    %ebx,%edi
xor    %esi,%esi
call   1060 <ftruncate@plt>
xor    %eax,%eax
call   1040 <getpid@plt>
lea    0xe48(%rip),%rsi
mov    %rsp,%rbp
mov    %rbp,%rdi
mov    %rax,%rdx
call   10b0 <sprintf@plt>
mov    %rbp,%rdi
call   1050 <strlen@plt>
lea    0x1(%rax),%rdx
mov    %ebx,%edi
mov    %rbp,%rsi
call   1030 <write@plt>
mov    0x2d5b(%rip),%rax
mov    (%rax),%edi
lea    0xe18(%rip),%rsi
xor    %eax,%eax
call   1080 <syslog@plt>
jmp    12a9 <already_running+0x109>
mov    0x2d62(%rip),%rax
mov    (%rax),%rax
mov    0x2d68(%rip),%rcx
cmp    (%rcx),%rax
je     1279 <already_running+0xd9>
mov    0x2d14(%rip),%rcx
cmp    (%rcx),%rax
jne    12c7 <already_running+0x127>
mov    0x2d20(%rip),%rax
mov    (%rax),%ebp
xor    %eax,%eax
call   1040 <getpid@plt>
lea    0xd96(%rip),%rsi
mov    %ebp,%edi
mov    %rax,%rdx
xor    %eax,%eax
call   1080 <syslog@plt>
mov    %ebx,%edi
call   1070 <close@plt>
mov    $0x1,%r14d
mov    %r14d,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %rbp
ret
mov    0x2cd4(%rip),%rax
mov    (%rax),%edi
lea    0xd4f(%rip),%rsi
jmp    12d7 <already_running+0x137>
mov    0x2cc2(%rip),%rax
mov    (%rax),%edi
lea    0xd79(%rip),%rsi
lea    0xd22(%rip),%rdx
xor    %eax,%eax
call   1080 <syslog@plt>
mov    $0x1,%edi
call   10c0 <exit@plt>

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

LLVM IR (-O2):
@.str = [20 x i8] c"/var/run/daemon.pid\00"
@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.1 = [18 x i8] c"can't open %s: %m\00"
@errno = global i64 0
@EACCES = global i64 0
@EAGAIN = global i64 0
@LOG_INFO = global i32 0
@.str.2 = [42 x i8] c"%ld has running instance, (%m), exiting..\00"
@.str.3 = [18 x i8] c"can't lock %s: %m\00"
@.str.4 = [4 x i8] c"%ld\00"
@.str.5 = [41 x i8] c"first instance of daemon, allow running!\00"
define i32 @already_running() {
%1 = alloca [16 x i8]
%2 = getelementptr inbounds [16 x i8], [16 x i8]* %1, i64 0, i64 0
%3 = load i32, i32* @O_RDWR
%4 = load i32, i32* @O_CREAT
%5 = or i32 %4, %3
%6 = load i32, i32* @S_IRUSR
%7 = load i32, i32* @S_IWUSR
%8 = or i32 %7, %6
%9 = load i32, i32* @S_IRGRP
%10 = or i32 %8, %9
%11 = load i32, i32* @S_IROTH
%12 = or i32 %10, %11
%13 = tail call i32 @open(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i32 %5, i32 %12)
%14 = icmp slt i32 %13, 0
br i1 %14, label %15, label %19
15: ; preds = %0
%16 = load i32, i32* @LOG_ERR
%17 = tail call i32 (i32, i8*, ...) @syslog(i32 %16, i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0))
%18 = tail call i32 @exit(i32 1)
unreachable
19: ; preds = %0
%20 = tail call i64 @lockfile(i32 %13)
%21 = icmp slt i64 %20, 0
br i1 %21, label %22, label %38
22: ; preds = %19
%23 = load i64, i64* @errno
%24 = load i64, i64* @EACCES
%25 = icmp eq i64 %23, %24
%26 = load i64, i64* @EAGAIN
%27 = icmp eq i64 %23, %26
%28 = select i1 %25, i1 true, i1 %27
br i1 %28, label %29, label %34
29: ; preds = %22
%30 = load i32, i32* @LOG_INFO
%31 = tail call i64 (...) @getpid()
%32 = tail call i32 (i32, i8*, ...) @syslog(i32 %30, i8* getelementptr inbounds ([42 x i8], [42 x i8]* @.str.2, i64 0, i64 0), i64 %31)
%33 = tail call i32 @close(i32 %13)
br label %47
34: ; preds = %22
%35 = load i32, i32* @LOG_ERR
%36 = tail call i32 (i32, i8*, ...) @syslog(i32 %35, i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.3, i64 0, i64 0), i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0))
%37 = tail call i32 @exit(i32 1)
unreachable
38: ; preds = %19
%39 = tail call i32 @ftruncate(i32 %13, i32 0)
%40 = tail call i64 (...) @getpid()
%41 = call i32 @sprintf(i8* %2, i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i64 %40)
%42 = call i64 @strlen(i8* %2)
%43 = add nsw i64 %42, 1
%44 = call i32 @write(i32 %13, i8* %2, i64 %43)
%45 = load i32, i32* @LOG_INFO
%46 = tail call i32 (i32, i8*, ...) @syslog(i32 %45, i8* getelementptr inbounds ([41 x i8], [41 x i8]* @.str.5, i64 0, i64 0))
br label %47
47: ; preds = %38, %29
%48 = phi i32 [ 1, %29 ], [ 0, %38 ]
ret i32 %48
}