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Perl Programming/Keywords/wantarray
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Perl waitpid warn Keywords
The wantarray keyword
The function wantarray returns true, if eval or the context of the currently executing subroutine is looking for a list value, and returns false, if the context is looking for a scalar. wantarray returns the undef, if the context is looking for no value (void context).
The result of wantarray() is unspecified in the top level of a file, in a wantarray, BEGIN, CHECK, INIT, END, or UNITCHECK block. The same is the case for the DESTROY method.
Syntax
wantarray PID, FLAGS
Perl waitpid warn Keywords