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Whatever variable you put the return value of read in. From perldoc -f read
Returns the number of characters actually read, 0 at end of file, or undef if there was an error (in the latter case $! is also set).
So, you'd do something like:
my $r; while ($r = read ...) { ... do stuff here ... } die "read failed: $!" unless defined $r;
I guess since 5.10, you could also write:
while (read(...) // die "read failed: $!") { ... do stuff here ... }
but I don't think I would want to recommend that.

In reply to Re^3: mysterious error of read function in solaris by JavaFan
in thread mysterious error of read function in solaris by david2008

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