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1# Util.py - Python extension for perf script, miscellaneous utility code
2#
3# Copyright (C) 2010 by Tom Zanussi <tzanussi@gmail.com>
4#
5# This software may be distributed under the terms of the GNU General
6# Public License ("GPL") version 2 as published by the Free Software
7# Foundation.
8
9import errno, os
10
11FUTEX_WAIT = 0
12FUTEX_WAKE = 1
13FUTEX_PRIVATE_FLAG = 128
14FUTEX_CLOCK_REALTIME = 256
15FUTEX_CMD_MASK = ~(FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME)
16
17NSECS_PER_SEC    = 1000000000
18
19def avg(total, n):
20    return total / n
21
22def nsecs(secs, nsecs):
23    return secs * NSECS_PER_SEC + nsecs
24
25def nsecs_secs(nsecs):
26    return nsecs / NSECS_PER_SEC
27
28def nsecs_nsecs(nsecs):
29    return nsecs % NSECS_PER_SEC
30
31def nsecs_str(nsecs):
32    str = "%5u.%09u" % (nsecs_secs(nsecs), nsecs_nsecs(nsecs)),
33    return str
34
35def add_stats(dict, key, value):
36	if not dict.has_key(key):
37		dict[key] = (value, value, value, 1)
38	else:
39		min, max, avg, count = dict[key]
40		if value < min:
41			min = value
42		if value > max:
43			max = value
44		avg = (avg + value) / 2
45		dict[key] = (min, max, avg, count + 1)
46
47def clear_term():
48    print("\x1b[H\x1b[2J")
49
50audit_package_warned = False
51
52try:
53	import audit
54	machine_to_id = {
55		'x86_64': audit.MACH_86_64,
56		'alpha'	: audit.MACH_ALPHA,
57		'ia64'	: audit.MACH_IA64,
58		'ppc'	: audit.MACH_PPC,
59		'ppc64'	: audit.MACH_PPC64,
60		's390'	: audit.MACH_S390,
61		's390x'	: audit.MACH_S390X,
62		'i386'	: audit.MACH_X86,
63		'i586'	: audit.MACH_X86,
64		'i686'	: audit.MACH_X86,
65	}
66	try:
67		machine_to_id['armeb'] = audit.MACH_ARMEB
68	except:
69		pass
70	machine_id = machine_to_id[os.uname()[4]]
71except:
72	if not audit_package_warned:
73		audit_package_warned = True
74		print "Install the audit-libs-python package to get syscall names.\n" \
75                    "For example:\n  # apt-get install python-audit (Ubuntu)" \
76                    "\n  # yum install audit-libs-python (Fedora)" \
77                    "\n  etc.\n"
78
79def syscall_name(id):
80	try:
81		return audit.audit_syscall_to_name(id, machine_id)
82	except:
83		return str(id)
84
85def strerror(nr):
86	try:
87		return errno.errorcode[abs(nr)]
88	except:
89		return "Unknown %d errno" % nr
90