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Two problems.

First, %s in a printf() format string causes printf() to expect a pointer to a string, so you want to pass str and not what it's pointing to (not *str).

Secondly, you need to copy...

free(3) is not a system call.

from gnu.org GLIBC manual

1, Only memory allocated explicitly or implicitly by malloc() should be free() manually (explicitly or use wrapper of free).

2, If you don't free them, OS will recycle them when the process...

As Corona688 says generate the digits for the 5 decimal places. I'd pick 3 digits then 2 as RANDOM won't go high enough to pick all 5

#!/bin/bash
listFloats=0.0
for i in {0..3}
do
...

BASH doesn't support floating point numbers.

How about generating random digits 0-9 and appending that into a floating point number?

Searching the Web for "arch multilib" yields this (https://wiki.archlinux.org/index.php/Arch64_FAQ#Can_I_run_32-bit_apps_inside_Arch64.3F).

The original APUE from Steven's has been reworked by Rago, which gave birth the APUE 2nd edition, see APUE2e (http://www.apuebook.com/). This book is good, no point.

The most recent and...

If you want portability, you should not be using FreeBSD specific APIs. Stick to the set of APIs defined by the POSIX.1 standard.

unless you are coding based on POSIX standards it doesn't matter what platform your are using. all of them will do the trick.
"Advanced Programming in the UNIX Environment" is one of the best (no i...

What system calls have you found to be missing?

What you want to do is get a copy of Stevens 'Advanced Programming in the UNIX Environment'

It shows all of the system calls for linux/solaris/FreeBSD and shows how to get portability.

...your...