92 lines
2.9 KiB
Python
92 lines
2.9 KiB
Python
#!/usr/bin/env python2
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#
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# Copyright (c) 2008, Thomas Hurst <tom@hur.st>
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#
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# Use of this file is unrestricted provided this notice is retained.
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# If you use it, it'd be nice if you dropped me a note. Also beer.
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"""
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freebsd.get_process_cwd(pid):
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Use sysctl() to retrieve the cwd of an arbitrary process on FreeBSD
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using kern.proc.filedesc, as used by procstat(1).
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Tested on FreeBSD 7-STABLE/amd64 from April 11 2008.
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"""
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from ctypes import *
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from ctypes.util import find_library
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class sockaddr_storage(Structure):
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"""struct sockaddr_storage, defined in /usr/include/sys/socket.h"""
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_fields_ = [
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('ss_len', c_char),
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('ss_family', c_char), # /usr/include/sys/_types.h; _uint8_t
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('__ss_pad1', c_char * 6), # (sizeof(int64) - sizeof(char) - sizeof(ss_family_t))
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('__ss_align', c_longlong),
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('__ss_pad2', c_char * 112), # (128(maxsize) - sizeof(char) - sizeof(ss_family_t) -
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# sizeof(ss_pad1) - sizeof(int64))
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]
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class kinfo_file(Structure):
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"""struct kinfo_file, defined in /usr/include/sys/user.h """
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_fields_ = [
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('kf_structsize', c_int),
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('kf_type', c_int),
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('kf_fd', c_int),
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('kf_ref_count', c_int),
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('kf_flags', c_int),
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('kf_offset', c_size_t), # this is a off_t, a pointer
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('kf_vnode_type', c_int),
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('kf_sock_domain', c_int),
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('kf_sock_type', c_int),
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('kf_sock_protocol', c_int),
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('kf_path', c_char * 1024), # PATH_MAX
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('kf_sa_local', sockaddr_storage),
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('kf_sa_peer', sockaddr_storage),
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]
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libc = CDLL(find_library('c'))
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uintlen = c_size_t(sizeof(c_uint))
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ver = c_uint(0)
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if (libc.sysctlbyname('kern.osreldate', byref(ver), byref(uintlen), None, 0) < 0):
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raise OSError("sysctlbyname returned < 0")
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# kern.proc.filedesc added for procstat(1) after these __FreeBSD_versions
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if ver.value < 700104 and ver.value < 800019:
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raise NotImplementedError("cwd detection requires a recent 7.0-STABLE or 8-CURRENT")
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def get_process_cwd(pid):
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"""Return string containing the current working directory of the given pid,
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or None on failure."""
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# /usr/include/sys/sysctl.h
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# CTL_KERN, KERN_PROC, KERN_PROC_FILEDESC
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oid = (c_uint * 4)(1, 14, 14, pid)
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if libc.sysctl(oid, 4, None, byref(uintlen), None, 0) < 0:
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return None
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buf = c_char_p(" " * uintlen.value)
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if libc.sysctl(oid, 4, buf, byref(uintlen), None, 0) < 0:
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return None
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kifs = cast(buf, POINTER(kinfo_file))
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for i in range(0, uintlen.value / sizeof(kinfo_file)):
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kif = kifs[i]
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if kif.kf_fd == -1: # KF_FD_TYPE_CWD
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return kif.kf_path
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if __name__ == '__main__':
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import os, sys
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print(" => %d cwd = %s" % (os.getpid(), get_process_cwd(os.getpid())))
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for pid in sys.argv:
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try:
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pid = int(pid)
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except:
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pass
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else:
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print(" => %d cwd = %s" % (pid, get_process_cwd(pid)))
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