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Code Issues Releases Wiki Activity

Make platform.libc_ver() less slow

This commit is contained in:
Antoine Pitrou 2011-10-07 13:26:59 +02:00
parent 978b9d2a27
commit ba7c226095
1 changed files with 15 additions and 10 deletions
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25
Lib/platform.py
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@ -130,15 +130,15 @@ except AttributeError:
### Platform specific APIs
_libc_search = re.compile(r'(__libc_init)'
'|'
'(GLIBC_([0-9.]+))'
'|'
'(libc(_\w+)?\.so(?:\.(\d[0-9.]*))?)', re.ASCII)
_libc_search = re.compile(b'(__libc_init)'
b'|'
b'(GLIBC_([0-9.]+))'
b'|'
br'(libc(_\w+)?\.so(?:\.(\d[0-9.]*))?)', re.ASCII)
def libc_ver(executable=sys.executable,lib='',version='',
chunksize=2048):
chunksize=16384):
""" Tries to determine the libc version that the file executable
(which defaults to the Python interpreter) is linked against.
@ -159,17 +159,22 @@ def libc_ver(executable=sys.executable,lib='',version='',
# able to open symlinks for reading
executable = os.path.realpath(executable)
f = open(executable,'rb')
binary = f.read(chunksize).decode('latin-1')
binary = f.read(chunksize)
pos = 0
while 1:
m = _libc_search.search(binary,pos)
if b'libc' in binary or b'GLIBC' in binary:
m = _libc_search.search(binary,pos)
else:
m = None
if not m:
binary = f.read(chunksize).decode('latin-1')
binary = f.read(chunksize)
if not binary:
break
pos = 0
continue
libcinit,glibc,glibcversion,so,threads,soversion = m.groups()
libcinit,glibc,glibcversion,so,threads,soversion = [
s.decode('latin1') if s is not None else s
for s in m.groups()]
if libcinit and not lib:
lib = 'libc'
elif glibc: