def __init__(self, trace_path=None):
"""
<Purpose>
Creates a trace object containing all the information extracted from a
trace file.
<Arguments>
trace_path:
The path to the trace file containing all needed information.
<Exceptions>
IOError:
If no trace_path is given.
IOError:
If the trace_path given is not a file.
<Side Effects>
None
<Returns>
None
"""
self.trace_path = trace_path
# Were we given a trace path?
if self.trace_path == None:
raise IOError("A trace file is needed to initialize a Trace object")
# does this file exist?
if not os.path.exists(self.trace_path):
raise IOError("Could not find trace file `" + self.trace_path + "`")
# detect tracing utility used to generate the trace file. peek here to avoid
# re-initializing the file.
self.tracing_utility = self._detect_tracing_utility()
# select parser according to the tracing utility.
if self.tracing_utility == "strace":
self.parser = StraceParser(self.trace_path)
elif self.tracing_utility == "truss":
self.parser = TrussParser(self.trace_path)
else:
raise Exception("Unknown parser when attempting to parse trace.")
# parse system calls
self.syscalls = self.parser.parse_trace()
# get platform information
self.platform = sys.platform
class Trace:
"""
<Purpose>
This object represents an entire system call trace, which means that it
holds all the information extracted from a system call trace file created by
an interposition utility such as the strace utility on Linux, the truss
utility on Solaris or the dtrace utility on BSD and OSX platforms.
<Attributes>
self.trace_path:
The path to the file containing the traced system calls.
self.tracing_utility:
The detected tracing utility used to generate the trace file, e.g strace.
self.parser:
The parser to use in order to extract the information from the trace file.
The choice of parser depends on the tracing utility used to generate the
trace file, i.e self.tracing_utility.
self.syscalls:
This variable holds all the parsed system calls. It is a list of Syscall
objects returned by the parser.
self.platform:
The platform in which the trace is parsed on (sys.platform). This is
especially useful when creating a trace bundle containing not only the
parsed system calls but also a representation of all the files referenced
in trace file.
"""
def __init__(self, trace_path=None):
"""
<Purpose>
Creates a trace object containing all the information extracted from a
trace file.
<Arguments>
trace_path:
The path to the trace file containing all needed information.
<Exceptions>
IOError:
If no trace_path is given.
IOError:
If the trace_path given is not a file.
<Side Effects>
None
<Returns>
None
"""
self.trace_path = trace_path
# Were we given a trace path?
if self.trace_path == None:
raise IOError("A trace file is needed to initialize a Trace object")
# does this file exist?
if not os.path.exists(self.trace_path):
raise IOError("Could not find trace file `" + self.trace_path + "`")
# detect tracing utility used to generate the trace file. peek here to avoid
# re-initializing the file.
self.tracing_utility = self._detect_tracing_utility()
# select parser according to the tracing utility.
if self.tracing_utility == "strace":
self.parser = StraceParser(self.trace_path)
elif self.tracing_utility == "truss":
self.parser = TrussParser(self.trace_path)
else:
raise Exception("Unknown parser when attempting to parse trace.")
# parse system calls
self.syscalls = self.parser.parse_trace()
# get platform information
self.platform = sys.platform
# - in bundle can store metadata what command / date / OS / etc the trace was
# - gathered from.
def _detect_tracing_utility(self):
"""
<Purpose>
Using the trace file given in self.trace_path figure out which tracing
utility was used to generate this trace file.
<Arguments>
None
<Exceptions>
None
<Side Effects>
None
<Returns>
tracing_utility:
The name of the tracing utility used to generate the trace file.
"""
# TODO: Unimplemented. return strace for now
tracing_utility = "strace"
return tracing_utility
def __repr__(self):
representation = "<Trace\nplatform=" + self.platform \
+ "\ntrace_path=" + self.trace_path \
+ "\ntracing_utility=" + self.tracing_utility \
+ "\nparser=" + str(self.parser) \
+ "\ntraced_syscalls=" + str(len(self.syscalls)) + ">"
return representation