gawk/getline

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Hello,

This is a bit on the side, but the behavior of getline in gawk is a bit
strange.
getline $0
returns 0 when EOF.

but
getline "myfile.txt"
never returns 0 
like if there in no EOF

What am I missing?

===========================================================================
 Patrick DUPRÉ                                 | | email: pdupre@xxxxxxx
 Laboratoire de Physico-Chimie de l'Atmosphère | |
 Université du Littoral-Côte d'Opale           | |
 Tel.  (33)-(0)3 28 23 76 12                   | | Fax: 03 28 65 82 44
 189A, avenue Maurice Schumann                 | | 59140 Dunkerque, France
===========================================================================
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