#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 */
struct flock {
  scalar_t__ l_len;
  scalar_t__ l_start;
  int /*<<< orphan*/ l_whence;
  int /*<<< orphan*/ l_type;
};

/* Variables and functions */
int /*<<< orphan*/ F_SETLKW;
int /*<<< orphan*/ F_WRLCK;
int /*<<< orphan*/ SEEK_SET;
scalar_t__ fcntl(int, int /*<<< orphan*/, struct flock *);
int /*<<< orphan*/ giveup(char *);
void lockFile(int fd) {
  struct flock fl;
  fl.l_type = F_WRLCK;
  fl.l_whence = SEEK_SET;
  fl.l_start = 0;
  fl.l_len = 0;
  if (fcntl(fd, F_SETLKW, &fl) < 0)
    giveup("Can't lock");
}


x86 assembly (clang, -O0):
<lockFile>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x4(%rbp)
mov    0x2e9e(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0xc(%rbp)
mov    0x2e9a(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x10(%rbp)
movq   $0x0,-0x18(%rbp)
movq   $0x0,-0x20(%rbp)
mov    -0x4(%rbp),%edi
mov    0x2e8b(%rip),%rax
mov    (%rax),%esi
lea    -0x20(%rbp),%rdx
call   1040 <fcntl@plt>
cmp    $0x0,%rax
jge    117e <lockFile+0x5e>
lea    0xe87(%rip),%rdi
call   1030 <giveup@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<lockFile>:
sub    $0x18,%rsp
mov    0x2ea5(%rip),%rax
mov    (%rax),%eax
mov    %eax,0x14(%rsp)
mov    0x2ea0(%rip),%rax
mov    (%rax),%eax
mov    %eax,0x10(%rsp)
xorps  %xmm0,%xmm0
movaps %xmm0,(%rsp)
mov    0x2e9c(%rip),%rax
mov    (%rax),%esi
mov    %rsp,%rdx
call   1040 <fcntl@plt>
test   %rax,%rax
js     1160 <lockFile+0x40>
add    $0x18,%rsp
ret
lea    0xe99(%rip),%rdi
call   1030 <giveup@plt>
add    $0x18,%rsp
ret

LLVM IR (-O0):
%struct.flock = type { i64, i64, i32, i32 }
@F_WRLCK = global i32 0
@SEEK_SET = global i32 0
@F_SETLKW = global i32 0
@.str = [11 x i8] c"Can't lock\00"
define void @lockFile(i32 %0) {
%2 = alloca i32
%3 = alloca %struct.flock
store i32 %0, i32* %2
%4 = load i32, i32* @F_WRLCK
%5 = getelementptr inbounds %struct.flock, %struct.flock* %3, i32 0, i32 3
store i32 %4, i32* %5
%6 = load i32, i32* @SEEK_SET
%7 = getelementptr inbounds %struct.flock, %struct.flock* %3, i32 0, i32 2
store i32 %6, i32* %7
%8 = getelementptr inbounds %struct.flock, %struct.flock* %3, i32 0, i32 1
store i64 0, i64* %8
%9 = getelementptr inbounds %struct.flock, %struct.flock* %3, i32 0, i32 0
store i64 0, i64* %9
%10 = load i32, i32* %2
%11 = load i32, i32* @F_SETLKW
%12 = call i64 @fcntl(i32 %10, i32 %11, %struct.flock* %3)
%13 = icmp slt i64 %12, 0
br i1 %13, label %14, label %16
14: ; preds = %1
%15 = call i32 @giveup(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0))
br label %16
16: ; preds = %14, %1
ret void
}

LLVM IR (-O2):
%struct.flock = type { i64, i64, i32, i32 }
@F_WRLCK = global i32 0
@SEEK_SET = global i32 0
@F_SETLKW = global i32 0
@.str = [11 x i8] c"Can't lock\00"
define void @lockFile(i32 %0) {
%2 = alloca %struct.flock
%3 = bitcast %struct.flock* %2 to i8*
%4 = load i32, i32* @F_WRLCK
%5 = getelementptr inbounds %struct.flock, %struct.flock* %2, i64 0, i32 3
store i32 %4, i32* %5
%6 = load i32, i32* @SEEK_SET
%7 = getelementptr inbounds %struct.flock, %struct.flock* %2, i64 0, i32 2
store i32 %6, i32* %7
%8 = bitcast %struct.flock* %2 to i8*
%9 = load i32, i32* @F_SETLKW
%10 = call i64 @fcntl(i32 %0, i32 %9, %struct.flock* %2)
%11 = icmp slt i64 %10, 0
br i1 %11, label %12, label %14
12: ; preds = %1
%13 = call i32 @giveup(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0))
br label %14
14: ; preds = %12, %1
ret void
}