Blog-Thread: Creating a Shell Wrapper and Runtime Modifier (SWARM) Post: 303045615

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Top Forums Shell Programming and Scripting Blog-Thread: Creating a Shell Wrapper and Runtime Modifier (SWARM) Post 303045615 by sea on Friday 3rd of April 2020 04:06:58 PM

04-03-2020

Registered User

Previously
Still writing and ironing out the default core display functions.
This includes reducing code that was written (at least) twice and could be 'combined' to a single function.

But mostly - as for optimizing code - I try to find a proper way around the the injection protection and 'bold' or colored strings that one might want to use/display.
At the very least so that the function title prints bold text.

The injection protection is not based on my skillset, however, I can read a case and some basic regex so I saw/knew that the console code for 'bold' causes an 'issue', which it did.

Next on my wish todolist is pick and cfg.set.
And I also need to finish bol2str in order to start with swarm.
I need to get the (basic, at least) swarm function done before the config editor - just so I can start scripting other things properly, and do 'external end-user' testing and so I can keep the code cleaner.
Also that will help to keep motivation up.

Current question...
However, for my current task at hand, the read wrappers, yesno, pick and input were, well - still are, based on the physicaly installed read I had to actualy parse the --help output of it to get its functionality to get them work poperly (for TUI).
Now for SWARM I'd like to reduce physical disk usage (files) to a minimum (for non-log actions; setting).

This and the recent Heureka that there's a builtin read, made me hope that the bash builtin read might have the same functions across all distros - as long the propper BASH version is installed, which would simplify the 'wrapping' process.... alot...

How to provide help?
Also the 'help' functionality of SWARM is slowly evolving in my head.
Main challenge here is that I want to distinct functions (for the help usage) between 'basics' and 'advanced', while keep most of it 'dynamic' to use - yet simple for translating.
Because I dont WANT to write actual help text for functions, because to get those, you would need to source SWARM and then call the function with --help, which seems 'too much' for me.

So I'd rather write/modify the (former) manpages and write a handler to work like:

Code:

./SWARM/runtime help [topic]

So you can 'stay' in your current project but still get the information you need.

That's for now, have a nice weekend and stay healthy everyone!

sea

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LEARN ABOUT HPUX

pthread_rwlock_wrlock

pthread_rwlock_wrlock(3T)												 pthread_rwlock_wrlock(3T)

NAME

       pthread_rwlock_wrlock(), pthread_rwlock_trywrlock() - lock or attempt to lock a read-write lock for writing

SYNOPSIS

PARAMETERS

	      rwlock	Pointer to the read-write lock to be locked for writing.

DESCRIPTION

       The  function  applies  a  write lock to the read-write lock object referenced by rwlock.  The calling thread acquires the write lock if no
       other thread (reader or writer) holds the read-write lock rwlock.  Otherwise, the thread blocks (that is, it does not return from the call)
       until  it  can acquire the lock.  Results are undefined if the calling thread holds the read-write lock (whether a read or a write lock) at
       the time the call is made.

       The function applies a write lock as in the function with the exception that the function fails if any thread currently holds  rwlock  (for
       reading or writing).

       Results are undefined if any of these functions are called with an uninitialized read-write lock.

       If  a  signal  is delivered to a thread waiting for a read-write lock, upon return from the signal handler, the thread shall resume waiting
       for the read-write lock as if it was not interrupted.

RETURN VALUE

       Upon successful completion, and return zero. Otherwise, an error number is returned to indicate the error (the variable is not set).

ERRORS

       If any of the following occur, the function returns the corresponding error number:

	      [EBUSY]	     The read-write lock rwlock could not be acquired for writing because it was already locked for reading or writing.

       For each of the following conditions, if the condition is detected, the and functions return the corresponding error number:

	      [EINVAL]	     The value specified by rwlock does not refer to an initialized read-write lock.

	      [EDEADLK]      The current thread already owns the read-write lock for reading or writing.

AUTHOR

       and were developed by X/Open.

SEE ALSO

       pthread_rwlock_init(3T), pthread_rwlock_destroy(3T), pthread_rwlock_tryrdlock(3T), pthread_rwlock_rdlock(3T), pthread_rwlock_unlock(3T).

STANDARDS CONFORMANCE

								  Pthread Library					 pthread_rwlock_wrlock(3T)