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additional debug for lber memory functions (ITS#584)
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Full_Name: Alan Clark
Version: devel
OS: Linux / NetWare / WinNT
URL: ftp://ftp.openldap.org/incoming/aclark-000609
The above patch adds additional debug to the lber memory functions. =
Specifically it
does the following:
1. Puts a known value at the end of the buffer (one is already at the =
beginning)
2. Checks for both values being there on all free and realloc functions. =
This identifies
buffers that have had their head or tail overwritten.
3. Any memory freed is filled with poison - 0xff to make it easier to =
find code
that uses memory after it is free'd.
Since we now have the buffer size, at both alloc and free time,
I put in a little counter that gives the current value for amount of =
memory allocated. Note: this value won't be correct if the library is =
running=20
in the kernel or for multi-threaded applications, as there is no lock =
around modification
of the counter.
I added a ber_get/get option to get the value. This has proved very =
helpful to us
when searching for memory leaks.
You're welcome to it if it seems useful to you.
-Steve Sonntag
-Alan Clark
Manager
Novell Directory Services
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<DIV>Full_Name: Alan Clark<BR>Version: devel<BR>OS: Linux / NetWare /=20
WinNT<BR>URL: <A=20
href=3D"ftp://ftp.openldap.org/incoming/aclark-00060";>ftp://ftp.openldap.or=
g/incoming/aclark-00060</A>9</DIV>
<DIV> </DIV>
<DIV>The above patch adds additional debug to the lber memory functions.&nb=
sp;=20
Specifically it</DIV>
<DIV>does the following:</DIV>
<DIV> </DIV>
<DIV>1. Puts a known value at the end of the buffer (one is already =
at the=20
beginning)</DIV>
<DIV>2. Checks for both values being there on all free and realloc=20
functions. This identifies</DIV>
<DIV> buffers that have had their head or tail overwritten.</DIV>
<DIV>3. Any memory freed is filled with poison - 0xff to make it =
easier to=20
find code</DIV>
<DIV> that uses memory after it is free'd.</DIV>
<DIV> </DIV>
<DIV>Since we now have the buffer size, at both alloc and free time,</DIV>
<DIV>I put in a little counter that gives the current value for amount of =
memory=20
allocated. Note: this value won't be correct if the library is =
running=20
</DIV>
<DIV>in the kernel or for multi-threaded applications, as there is no =
lock=20
around modification</DIV>
<DIV>of the counter.</DIV>
<DIV> </DIV>
<DIV>I added a ber_get/get option to get the value. This has proved =
very=20
helpful to us</DIV>
<DIV>when searching for memory leaks.</DIV>
<DIV> </DIV>
<DIV>You're welcome to it if it seems useful to you.</DIV>
<DIV> </DIV>
<DIV>-Steve Sonntag<BR>-Alan Clark</DIV>
<DIV>Manager</DIV>
<DIV>Novell Directory Services</DIV></BODY></HTML>
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