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Don't try to set SO_DONTLINGER if SO_DONTLINGER is undefined.
Use O_NONBLOCK instead of FNDELAY if FNDELAY is undefined.

Don't try to set SO_DONTLINGER if SO_DONTLINGER is undefined.
Use O_NONBLOCK instead of FNDELAY if FNDELAY is undefined.

Fall back to O_NONBLOCK if FNDELAY is undefined.

Fixed "make clean" target.

	erronously if an error occured in select() or if a timeout occured.

which included commits to RCS files with non-trunk default branches.

which included commits to RCS files with non-trunk default branches.

which included commits to RCS files with non-trunk default branches.

isc_initialize().

source tree was written.