mirror of
https://github.com/xen-project/xen.git
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Wei Liu
2ea46b760c
Provide two tools: a small C program to extract data from hypervisor and a python script to split data into multiple files. The file xencov.c is salvaged and modified from the original xencov.c. Signed-off-by: Wei Liu <wei.liu2@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
98 lines
2.5 KiB
Python
Executable File
98 lines
2.5 KiB
Python
Executable File
#!/usr/bin/python
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import sys, os, os.path as path, struct, errno
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from optparse import OptionParser
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def xencov_split(opts):
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"""Split input into multiple gcda files"""
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# Check native byte order and explicitly specify it. The "native"
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# byte order in struct module takes into account padding while the
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# data is always packed.
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if sys.byteorder == 'little':
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bo_prefix = '<'
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else:
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bo_prefix = '>'
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input_file = opts.args[0]
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f = open(input_file)
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# Magic number
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s = f.read(4)
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magic, = struct.unpack(bo_prefix + "I", s)
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# See public/sysctl.h for magic number -- "XCOV"
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if magic != 0x58434f56:
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raise Exception("Invalid magic number")
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# The rest is zero or more records
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content = f.read()
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f.close()
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while content:
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off = content.find('\x00')
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fmt = bo_prefix + str(off) + 's'
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fn, = struct.unpack_from(fmt, content)
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content = content[off+1:]
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fmt = bo_prefix + 'I'
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sz, = struct.unpack_from(fmt, content)
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content = content[struct.calcsize(fmt):]
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fmt = bo_prefix + str(sz) + 's'
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payload, = struct.unpack_from(fmt, content)
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content = content[sz:]
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# Create and store files
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if opts.output_dir == '.':
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opts.output_dir = os.getcwd()
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dir = opts.output_dir + path.dirname(fn)
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try:
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os.makedirs(dir)
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except OSError, e:
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if e.errno == errno.EEXIST and os.path.isdir(dir):
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pass
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else:
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raise
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full_path = dir + '/' + path.basename(fn)
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f = open(full_path, "w")
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f.write(payload)
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f.close()
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def main():
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""" Main entrypoint """
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# Change stdout to be line-buffered.
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sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 1)
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parser = OptionParser(
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usage = "%prog [OPTIONS] <INPUT>",
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description = "Utility to split xencov data file",
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)
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parser.add_option("--output-dir", action = "store",
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dest = "output_dir", default = ".",
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type = "string",
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help = ('Specify the directory to place output files, '
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'defaults to current directory'),
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)
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opts, args = parser.parse_args()
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opts.args = args
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xencov_split(opts)
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if __name__ == "__main__":
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try:
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sys.exit(main())
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except Exception, e:
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print >>sys.stderr, "Error:", e
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sys.exit(1)
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except KeyboardInterrupt:
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sys.exit(1)
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