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How to use shared memory with Linux in C
... exit(1);
}
/* make the key: */
if ((key = ftok("hello.txt", 'R')) == -1) /*Here the file must exist */
{
perror("ftok");
exit(1);
}
/* create the segment: */
if ((shmid = shmget(key, SHM_SIZE, 0644 | IPC_CREAT)) == -1) {
perror("shmget");
...
What does yield mean in PHP?
...bers. Here is an example using an array generated by explode() on a large .txt file (262MB in my use case):
<?php
ini_set('memory_limit','1000M');
echo "Starting memory usage: " . memory_get_usage()
What are commit-ish and tree-ish in Git?
...--------------------
| 15. <rev>:<path> | HEAD:README.txt, master:sub-directory/
----------------------------------------------------------------------
| Tree-ish? | Examples
----------------------------------------------------------------------
| ...
SQL left join vs multiple tables on FROM line?
...ard can be viewed at http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt .
It took many years before database companies adopted the SQL-92 standard.
So the reason why the second method is preferred, it is the SQL standard according the ANSI and ISO standards committee.
...
How do I create a namespace package in Python?
...ith namespace_packages=['package'], setup.py will add a namespace_packages.txt in the EGG-INFO. Still don't know the impacts…
– Laurent LAPORTE
Dec 9 '16 at 11:55
1
...
How do I check for a network connection?
...DNS lookup on www.msftncsi.com, then requests http://www.msftncsi.com/ncsi.txt. This file is a plain-text file and contains only the text 'Microsoft NCSI'.
NCSI sends a DNS lookup request for dns.msftncsi.com. This DNS address should resolve to 131.107.255.255. If the address does not match, then it...
Regular expression to match DNS hostname or IP Address?
...domain names:
tld=$(curl -s http://data.iana.org/TLD/tlds-alpha-by-domain.txt | sed 1d | cut -f1 -d'-' | tr '\n' '|' | sed 's/\(.*\)./\1/')
echo "($tld)"
That should give you a nice piece of re code that checks for legality of top domain name, like .com .org or .ca
Then add first part of the e...
How do I use a custom deleter with a std::unique_ptr member?
...ample, with a FILE*:
deleted_unique_ptr<FILE> file(
fopen("file.txt", "r"),
[](FILE* f) { fclose(f); });
With this you get the benefits of exception-safe cleanup using RAII, without needing try/catch noise.
...
What is the EAFP principle in Python?
...ght that we could access the file.
import os
my_file = "/path/to/my/file.txt"
# Race condition
if os.access(my_file, os.R_OK):
with open(my_file) as f:
print(f.read())
else:
print("File can't be accessed")
EAFP - Easier to Ask for Forgiveness than Permission :
In this example, ...
String literals and escape characters in postgresql
...and run the command \copy xxxxxxxxxxx FROM /support01/db/data/xxxxxxxxx_7F.txt DELIMITER AS E'\x7f', I get parse error at "'\x7f'". If I have the standard_conforming_strings=off; and use the same command above without the E and the Quotes... ( DELIMITER AS \x7f) I get the warning message, but the da...