[c] Code Segment


const struct vm_operations_struct generic_file_vm_ops = {
.fault = filemap_fault,
+ .page_mkwrite = filemap_page_mkwrite,
};

Code Dissection

1.const --- A C language keyword.
Makes variable value or pointer parameter unmodifiable.
2.struct --- A C language keyword
Groups variables into a single record.
3.vm_operations_struct --- A structure name.
4.generic_file_vm_ops --- A structure variable.
5. .fault and .page_mkwrite --- designated names.

source :http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html

Theory Drop

Structures  in C  are defined  as data  containers consisting  of a
sequence of  named members  of various types.  They are  similar to
records in other programming  languages. The members of a structure
are  stored  in  consecutive  locations  in  memory,  although  the
compiler is allowed to insert padding between or after members (but
not  before  the  first  member)  for efficiency.  The  size  of  a
structure is equal to the sum of the sizes of its members, plus the
size of the padding.

source : http://en.wikipedia.org/wiki/C_syntax#Structures_and_unions

CONNECTION

The code segment contains  "struct" keyword.

UNIX Command

$ls
a1.txt	a2.txt
$ls .
./  ../
$cp a1.txt a1.txt~
$ls
a1.txt	a1.txt~  a2.txt
$ls -B
a1.txt	a2.txt
$l
bash: l: command not found
$ls
a1.txt	a1.txt~  a2.txt
$ls --backup
ls: unrecognized option '--backup'
Try `ls --help' for more information.
$ls --ignore-backups
a1.txt	a2.txt
$

UNIX Command

$ls -a
.  ..  a1.txt  a2.txt
$ls -A
a1.txt	a2.txt
$ls
a1.txt	a2.txt
$

UNIX Explanation

 -a, --all
              do not ignore entries starting with .

 -A, --almost-all
              do not list implied . and ..

computer science related Theory Drop

In  computing, a  hidden directory  or hidden  file is  a directory
(folder)  or file  which file  system utilities  do not  display by
default.  They are commonly  used for  storing user  preferences or
preserving  the  state of  a  utility  and  are frequently  created
implicitly by using various utilities. Usually the intent is to not
"clutter" the display of the contents of a directory with files the
user did not create.

source :http://en.wikipedia.org/wiki/Hidden_file_and_hidden_directory

CONNECTION

current directory indicated by . and previous directory
indicated by .. are both hidden

http://www.beautifulwork.org/Js/foo.js

UNIX Command

$ls --author -l
total 4
-rw-r--r-- 1 jeffrin jeffrin jeffrin 0 Feb 19 22:30 a1.txt
-rw-r--r-- 1 jeffrin jeffrin jeffrin 2 Feb 19 22:31 a2.txt
$ls -l
total 4
-rw-r--r-- 1 jeffrin jeffrin 0 Feb 19 22:30 a1.txt
-rw-r--r-- 1 jeffrin jeffrin 2 Feb 19 22:31 a2.txt
$

UNIX Explanation

--author
              with -l, print the author of each file

computer science Theory Drop

The AND gate is a  basic digital logic gate that implements logical
conjunction  - it  behaves  according  to the  truth  table to  the
right. A HIGH output (1) results only if both the inputs to the AND
gate are HIGH (1). If neither or  only one input to the AND gate is
HIGH, a LOW  output results. In another sense,  the function of AND
effectively finds  the minimum between  two binary digits,  just as
the OR function finds the  maximum. Therefore, the output is always
0 except when all the inputs are 1s.

source :http://en.wikipedia.org/wiki/AND_gate

CONNECTION
Intended result is only obtained if
both -l and –author options are given(true).

UNIX Command

$ls --full-time
total 4
-rw-r--r-- 1 jeffrin jeffrin 0 2012-02-19 22:30:38.000000000 +0530 a1.txt
-rw-r--r-- 1 jeffrin jeffrin 2 2012-02-19 22:31:00.000000000 +0530 a2.txt
$date
Sat Feb 25 01:17:27 IST 2012
$date -R
Sat, 25 Feb 2012 01:19:41 +0530
$

UNIX Explanation

--full-time
              like -l --time-style=full-iso

computer science related Theory Drop

In   computer  science  and   computer  programming,   system  time
represents a computer  system's notion of the passing  of time.  In
this sense, time also includes the passing of days on the calendar.
System  time is  measured by  a  system clock,  which is  typically
implemented  as a simple  count of  the number  of ticks  that have
transpired since  some arbitrary  starting date, called  the epoch.
For example,  Unix and  POSIX-compliant systems encode  system time
("Unix time") as  the number of seconds elapsed  since the start of
the Unix epoch  at 1 January 1970 00:00:00  UT, with exceptions for
leap seconds.

source : http://en.wikipedia.org/wiki/System_time