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A comment on fork() can fail. Parent comment

Re:fork() can fail by maxlybbert on Wednesday August 20, 2014 @08:01PM (#8205324)
> Perl's undef isn't that different from returning, gosh, -2 or any other bloody number except -1 in C.

Returning undef has the advantage of being something completely useless as a process ID for any other function call.

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