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.