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How to track down a “double free or corruption” error
...
If you're using glibc, you can set the MALLOC_CHECK_ environment variable to 2, this will cause glibc to use an error tolerant version of malloc, which will cause your program to abort at the point where the double free is done.
You can set this from gdb by using ...
My docker container has no internet
...RIDGE type bridge
ip link delete docker0 type bridge
service docker start && service docker stop
iptables -t nat -A POSTROUTING ! -o docker0 -s 172.17.0.0/16 -j MASQUERADE
iptables -t nat -A POSTROUTING ! -o docker0 -s 172.18.0.0/16 -j MASQUERADE
service docker start
...
Generating random numbers in Objective-C
...te the S-Boxes via
arc4random_addrandom().
There is no need to call arc4random_stir() before using arc4random(), since arc4random() automatically
initializes itself.
EXAMPLES
The following produces a drop-in replacement for the traditional rand() and random() functions using
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Initialize a nested struct
I cannot figure out how to initialize a nested struct. Find an example here:
http://play.golang.org/p/NL6VXdHrjh
8 Answers...
Aborting a stash pop in Git
...l since some of the things it wants to undo did not get done.
Here's an example showing how the working copy (via git status) ends up clean again:
$ git status
# On branch trunk
nothing to commit (working directory clean)
$ git stash apply
Auto-merging foo.c
# On branch trunk
# Changed but not u...
Is it possible to set private property via reflection?
... Type t = obj.GetType();
FieldInfo fi = null;
while (fi == null && t != null)
{
fi = t.GetField(propName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
t = t.BaseType;
}
if (fi == null) throw new ArgumentOutOfRangeException("prop...
How do you set, clear, and toggle a single bit?
... more than the width of a long. The same applies to all the rest of the examples.
Clearing a bit
Use the bitwise AND operator (&) to clear a bit.
number &= ~(1UL << n);
That will clear the nth bit of number. You must invert the bit string with the bitwise NOT operator (~), then AND i...
Sorting a tab delimited file
...u probably want
sort -k4nr file.txt
to sort file.txt by column 4 numerically in reverse order. (Though the data in the question has even 5 fields so the last field would be index 5.)
share
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impr...
Equivalent of *Nix 'which' command in PowerShell?
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Is there any way to have the path all the time without to type '| Format-Table Path, Name' ?
– Guillaume
Jan 11 '13 at 8:18
11
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Efficient method to generate UUID String in JAVA (UUID.randomUUID().toString() without the dashes)
...y. There's an API I'm working with (high profile, well known) that doesn't allow dashes in its UUID. You have to strip them.
– Michael Gaines
Oct 28 '15 at 3:28
20
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