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## On Windows co-operative applications can be expected to open LLD's output
## with FILE_SHARE_DELETE included in the sharing mode. This allows us to link
## over the top of an existing file even if it is in use by another application.
# REQUIRES: system-windows, x86
# RUN: echo '.globl _start; _start:' > %t.s
# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-unknown %t.s -o %t.o
## FILE_SHARE_READ = 1
## FILE_SHARE_WRITE = 2
## FILE_SHARE_DELETE = 4
# RUN: %python %s %t.o 7
# RUN: not %python %s %t.o 3 2>&1 | FileCheck %s
# CHECK: error: failed to write to the output file
import contextlib
import ctypes
from ctypes import wintypes as w
import os
import shutil
import subprocess
import platform
import sys
import time
object_file = sys.argv[1]
share_flags = int(sys.argv[2])
@contextlib.contextmanager
def open_with_share_flags(filename, share_flags):
GENERIC_READ = 0x80000000
FILE_ATTRIBUTE_NORMAL = 0x80
OPEN_EXISTING = 0x3
INVALID_HANDLE_VALUE = w.HANDLE(-1).value
CreateFileA = ctypes.windll.kernel32.CreateFileA
CreateFileA.restype = w.HANDLE
h = CreateFileA(filename.encode('mbcs'), GENERIC_READ, share_flags,
None, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, None)
assert h != INVALID_HANDLE_VALUE, 'Failed to open ' + filename
try:
yield
finally:
ctypes.windll.kernel32.CloseHandle(h)
## Ensure we have an empty directory for the output.
outdir = os.path.basename(__file__) + '.dir'
if os.path.exists(outdir):
shutil.rmtree(outdir)
os.makedirs(outdir)
## Link on top of an open file.
elf = os.path.join(outdir, 'output_file.elf')
open(elf, 'wb').close()
with open_with_share_flags(elf, share_flags):
subprocess.check_call(['ld.lld.exe', object_file, '-o', elf])
## Check the linker wrote the output file.
with open(elf, 'rb') as f:
assert f.read(4) == b'\x7fELF', "linker did not write output file correctly"
## Check no temp files are left around.
## It might take a while for Windows to remove them, so loop.
deleted = lambda: len(os.listdir(outdir)) == 1
for _ in range(10):
if not deleted():
time.sleep (1)
assert deleted(), "temp file(s) not deleted after grace period"
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