#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();
scalar_t__ lockfile(int);
int open(char *, int, int);
int /*<<< orphan*/ sprintf(char *, char *, long);
int /*<<< orphan*/ strerror(scalar_t__);
scalar_t__ strlen(char *);
int /*<<< orphan*/ syslog(int /*<<< orphan*/, char *, char *,
                          int /*<<< orphan*/);
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 not open %s, %s", "/var/run/daemon.pid",
           strerror(errno));
    exit(1);
  };
  if (lockfile(fd) < 0) {
    if (errno == EACCES || errno == EAGAIN) {
      close(fd);
      return (1);
    };
    syslog(LOG_ERR, "can not lock %s: %s", "/var/run/daemon.pid",
           strerror(errno));
    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    $0x40,%rsp
mov    0x2e21(%rip),%rax
mov    (%rax),%esi
mov    0x2e30(%rip),%rax
or     (%rax),%esi
mov    0x2dd7(%rip),%rax
mov    (%rax),%edx
mov    0x2dfe(%rip),%rax
or     (%rax),%edx
mov    0x2dd5(%rip),%rax
or     (%rax),%edx
mov    0x2dc4(%rip),%rax
or     (%rax),%edx
lea    0xe0b(%rip),%rdi
call   10a0 <open@plt>
mov    %eax,-0x8(%rbp)
cmpl   $0x0,-0x8(%rbp)
jge    1244 <already_running+0x94>
mov    0x2d8a(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x24(%rbp)
mov    0x2da6(%rip),%rax
mov    (%rax),%rdi
call   10d0 <strerror@plt>
mov    -0x24(%rbp),%edi
mov    %eax,%ecx
lea    0xde6(%rip),%rsi
lea    0xdcb(%rip),%rdx
call   1080 <syslog@plt>
mov    $0x1,%edi
call   10c0 <exit@plt>
mov    -0x8(%rbp),%edi
call   1090 <lockfile@plt>
cmp    $0x0,%rax
jge    12db <already_running+0x12b>
mov    0x2d63(%rip),%rax
mov    (%rax),%rax
mov    0x2d69(%rip),%rcx
cmp    (%rcx),%rax
je     128a <already_running+0xda>
mov    0x2d49(%rip),%rax
mov    (%rax),%rax
mov    0x2d0f(%rip),%rcx
cmp    (%rcx),%rax
jne    129e <already_running+0xee>
mov    -0x8(%rbp),%edi
call   1070 <close@plt>
movl   $0x1,-0x4(%rbp)
jmp    1338 <already_running+0x188>
mov    0x2cf3(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x28(%rbp)
mov    0x2d0f(%rip),%rax
mov    (%rax),%rdi
call   10d0 <strerror@plt>
mov    -0x28(%rbp),%edi
mov    %eax,%ecx
lea    0xd63(%rip),%rsi
lea    0xd34(%rip),%rdx
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    0xd3a(%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>
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    0x2e21(%rip),%rax
mov    0x2e32(%rip),%rcx
mov    (%rcx),%esi
or     (%rax),%esi
mov    0x2dd7(%rip),%rax
mov    0x2e00(%rip),%rcx
mov    (%rcx),%edx
or     (%rax),%edx
mov    0x2dd5(%rip),%rax
or     (%rax),%edx
mov    0x2dc4(%rip),%rax
or     (%rax),%edx
lea    0xe0b(%rip),%rdi
call   10a0 <open@plt>
test   %eax,%eax
js     1288 <already_running+0xd8>
mov    %eax,%ebx
mov    %eax,%edi
call   1090 <lockfile@plt>
test   %rax,%rax
js     124f <already_running+0x9f>
xor    %ebp,%ebp
mov    %ebx,%edi
xor    %esi,%esi
call   1060 <ftruncate@plt>
xor    %eax,%eax
call   1040 <getpid@plt>
lea    0xe13(%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    127d <already_running+0xcd>
mov    0x2d6a(%rip),%rax
mov    (%rax),%rdi
mov    0x2d70(%rip),%rax
cmp    (%rax),%rdi
je     1271 <already_running+0xc1>
mov    0x2d24(%rip),%rax
cmp    (%rax),%rdi
jne    12a9 <already_running+0xf9>
mov    %ebx,%edi
call   1070 <close@plt>
mov    $0x1,%ebp
mov    %ebp,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %rbp
ret
mov    0x2d09(%rip),%rax
mov    (%rax),%ebx
mov    0x2d28(%rip),%rax
mov    (%rax),%rdi
call   10d0 <strerror@plt>
lea    0xd6d(%rip),%rsi
jmp    12be <already_running+0x10e>
mov    0x2ce8(%rip),%rax
mov    (%rax),%ebx
call   10d0 <strerror@plt>
lea    0xd6a(%rip),%rsi
lea    0xd3b(%rip),%rdx
mov    %ebx,%edi
mov    %eax,%ecx
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 = [20 x i8] c"can not open %s, %s\00"
@errno = global i64 0
@EACCES = global i64 0
@EAGAIN = global i64 0
@.str.2 = [20 x i8] c"can not lock %s: %s\00"
@.str.3 = [4 x i8] c"%ld\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 %23
17: ; preds = %0
%18 = load i32, i32* @LOG_ERR
%19 = load i64, i64* @errno
%20 = call i32 @strerror(i64 %19)
%21 = call i32 @syslog(i32 %18, i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i32 %20)
%22 = call i32 @exit(i32 1)
unreachable
23: ; preds = %0
%24 = load i32, i32* %2
%25 = call i64 @lockfile(i32 %24)
%26 = icmp slt i64 %25, 0
br i1 %26, label %27, label %44
27: ; preds = %23
%28 = load i64, i64* @errno
%29 = load i64, i64* @EACCES
%30 = icmp eq i64 %28, %29
br i1 %30, label %35, label %31
31: ; preds = %27
%32 = load i64, i64* @errno
%33 = load i64, i64* @EAGAIN
%34 = icmp eq i64 %32, %33
br i1 %34, label %35, label %38
35: ; preds = %31, %27
%36 = load i32, i32* %2
%37 = call i32 @close(i32 %36)
store i32 1, i32* %1
br label %56
38: ; preds = %31
%39 = load i32, i32* @LOG_ERR
%40 = load i64, i64* @errno
%41 = call i32 @strerror(i64 %40)
%42 = call i32 @syslog(i32 %39, i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i32 %41)
%43 = call i32 @exit(i32 1)
unreachable
44: ; preds = %23
%45 = load i32, i32* %2
%46 = call i32 @ftruncate(i32 %45, i32 0)
%47 = getelementptr inbounds [16 x i8], [16 x i8]* %3, i64 0, i64 0
%48 = call i64 (...) @getpid()
%49 = call i32 @sprintf(i8* %47, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i64 %48)
%50 = load i32, i32* %2
%51 = getelementptr inbounds [16 x i8], [16 x i8]* %3, i64 0, i64 0
%52 = getelementptr inbounds [16 x i8], [16 x i8]* %3, i64 0, i64 0
%53 = call i64 @strlen(i8* %52)
%54 = add nsw i64 %53, 1
%55 = call i32 @write(i32 %50, i8* %51, i64 %54)
store i32 0, i32* %1
br label %56
56: ; preds = %44, %35
%57 = load i32, i32* %1
ret i32 %57
}

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 = [20 x i8] c"can not open %s, %s\00"
@errno = global i64 0
@EACCES = global i64 0
@EAGAIN = global i64 0
@.str.2 = [20 x i8] c"can not lock %s: %s\00"
@.str.3 = [4 x i8] c"%ld\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 %21
15: ; preds = %0
%16 = load i32, i32* @LOG_ERR
%17 = load i64, i64* @errno
%18 = tail call i32 @strerror(i64 %17)
%19 = tail call i32 @syslog(i32 %16, i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i32 %18)
%20 = tail call i32 @exit(i32 1)
unreachable
21: ; preds = %0
%22 = tail call i64 @lockfile(i32 %13)
%23 = icmp slt i64 %22, 0
br i1 %23, label %24, label %38
24: ; preds = %21
%25 = load i64, i64* @errno
%26 = load i64, i64* @EACCES
%27 = icmp eq i64 %25, %26
%28 = load i64, i64* @EAGAIN
%29 = icmp eq i64 %25, %28
%30 = select i1 %27, i1 true, i1 %29
br i1 %30, label %31, label %33
31: ; preds = %24
%32 = tail call i32 @close(i32 %13)
br label %45
33: ; preds = %24
%34 = load i32, i32* @LOG_ERR
%35 = tail call i32 @strerror(i64 %25)
%36 = tail call i32 @syslog(i32 %34, i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i32 %35)
%37 = tail call i32 @exit(i32 1)
unreachable
38: ; preds = %21
%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.3, 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)
br label %45
45: ; preds = %38, %31
%46 = phi i32 [ 1, %31 ], [ 0, %38 ]
ret i32 %46
}