Not Linux related either. This is a classic C programming error.
Use parentheses.
If you say
if (running_ps = vfork() < 0) {
What you are really saying is
if (running_ps = (vfork() < 0)) {
which is not what you want.
There's a simple rule that saves you from this kind of blunder.
Don't rely on the operator precedences. Always fully parenthesize expressions.
The compiler generate the same code regardless, and at least it's then clear
what you were trying to achieve :-)
Tim
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