execline
Software
skarnet.org

The fdblock program

fdblock sets or unsets the O_NONBLOCK flag on a given file descriptor (which makes reading or writing non-blocking or blocking), then executes a program.

Interface

     fdblock [ -n ] fd prog...

fdblock makes the file descriptor number fd blocking, no matter what its previous state was. It then execs into prog with its arguments.

Options

• -n : non-blocking. Sets fd to non-blocking mode instead of blocking mode. If used on stdin (0) or stdout (1), this option will make a lot of command-line programs behave improperly, because most simple command-line programs only support blocking stdin and stdout. Make sure you know what you are doing.

Notes

• fdblock has no portable shell equivalent.