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