cellularmitosis

Blog 2020/1/27

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Comparison of Assembly across five architectures

I've been cobbling together a little collection of architectures as part of my journey to learn how to write a compiler.

pskocik

/*
NAME:
	shellguard

	Signal forwarding intermediary command executer that translates terminal-generated SIGINT/SIGQUIT (Ctlr+C/Ctrl+/)
	into SIGTERM/SIGABRT so that shell-backgrounded procesess don't stay running in the background when
	the user presses Ctrl+C or Ctrl+/.

PROBLEM:
	Shell scripts don't kill their child processes and instead rely on process-group-wide signals

Earnestly

C99 List of Undefined Behavior

From N1256: (See http://port70.net/~nsz/c/c99/n1256.html#J.2)

• A "shall" or "shall not" requirement that appears outside of a constraint is violated (clause 4).
• A nonempty source file does not end in a new-line character which is not immediately preceded by a backslash character or ends in a partial preprocessing token or comment (5.1.1.2).
• Token concatenation produces a character sequence matching the syntax of a universal character name (5.1.1.2).
• A program in a hosted environment does not define a function named main using one of the specified forms (5.1.2.2.1).
• A character not in the basic source character set is encountered in a source file, except in an identifier, a character constant, a string literal, a header name, a comment, or a preprocessing token that is never converted to a token (5.2.1).
• An identifier, comment, string literal, character constant, or header name contains an invalid multibyte character or does not

sshaw

Internal Bash functions, useful when writing loadable builtins

• Find an environment variable
• Set an environment variable to a string value
• Set an environment variable to a string value if it's not already set
• Check if an environment variable is set
• Check if an environment variable is an array
• Get an environment variable that's an array
• Unset an environment variable
• Create an array