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FAQ 8.43 How do I open a file without blocking?

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This is an excerpt from the latest version perlfaq8.pod, which
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to review and update the answers. The latest version of the complete
perlfaq is at .


8.43: How do I open a file without blocking?

If you're lucky enough to be using a system that supports non-blocking
reads (most Unixish systems do), you need only to use the "O_NDELAY" or
"O_NONBLOCK" flag from the "Fcntl" module in conjunction with

use Fcntl;
sysopen(FH, "/foo/somefile", O_WRONLY|O_NDELAY|O_CREAT, 0644)
or die "can't open /foo/somefile: $!":


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