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What does -D_XOPEN_SOURCE do/mean?
...h as Windows.
The numbers refer to different versions of the standard.
500 - X/Open 5, incorporating POSIX 1995
600 - X/Open 6, incorporating POSIX 2004
700 - X/Open 7, incorporating POSIX 2008
You can tell which one you need (if any) by looking at the man page for each function you call.
For ...
Which $_SERVER variables are safe?
...How safe is $_SERVER[“HTTP_HOST”]?.
Also see http://shiflett.org/blog/2006/mar/server-name-versus-http-host.
‡ See https://bugs.php.net/bug.php?id=64457, http://httpd.apache.org/docs/current/mod/core.html#usecanonicalphysicalport, http://httpd.apache.org/docs/2.4/mod/core.html#comment_999
En...
Check existence of input argument in a Bash shell script
...
It is:
if [ $# -eq 0 ]
then
echo "No arguments supplied"
fi
The $# variable will tell you the number of input arguments the script was passed.
Or you can check if an argument is an empty string or not like:
if [ -z "$1" ]
then
echo...
What is the advantage of GCC's __builtin_expect in if else statements?
...e the assembly code that would be generated from:
if (__builtin_expect(x, 0)) {
foo();
...
} else {
bar();
...
}
I guess it should be something like:
cmp $x, 0
jne _foo
_bar:
call bar
...
jmp after_if
_foo:
call foo
...
after_if:
You can see that the instr...
Forms authentication timeout vs sessionState timeout
... Session using the value in your example, this data will be removed after 30 minutes. The user may still be authenticated but the data in the Session may no longer be present. The Session Timeout value is always reset after every request.
...
How to copy data to clipboard in C#
...
Alexei Levenkov
92.4k1212 gold badges108108 silver badges152152 bronze badges
answered Aug 23 '10 at 8:59
Kieren JohnstoneKieren Johnstone
...
Get UIScrollView to scroll to the top
...
UPDATE FOR iOS 7
[self.scrollView setContentOffset:
CGPointMake(0, -self.scrollView.contentInset.top) animated:YES];
ORIGINAL
[self.scrollView setContentOffset:CGPointZero animated:YES];
or if you want to preserve the horizontal scroll position and just reset the vertical position:
...
How do I remove deleted branch names from autocomplete?
...
twalbergtwalberg
50.1k99 gold badges7777 silver badges7676 bronze badges
...
How do you manually execute SQL commands in Ruby On Rails using NuoDB
... |
edited Jan 23 '19 at 10:24
Jan Klimo
3,42911 gold badge2727 silver badges3737 bronze badges
answered...
Highlight the difference between two strings in PHP
... |
edited Jul 11 at 20:11
Toby Allen
10.4k1010 gold badges6767 silver badges119119 bronze badges
an...