fifo

实战Linux编程的原代码,希望对学驱动的人能有所帮助

#!/bin/sh
# Make sure touch works on fifos without hanging.

if test "$VERBOSE" = yes; then
  set -x
  touch --version
fi

framework_failure=0

tmp=fifo-$$
rm -rf $tmp
mkfifo $tmp || framework_failure=1

if test $framework_failure = 1; then
  # Make an exception of this case -- usually we interpret framework-creation
  # failure as a test failure.  However, in this case, when running on a SunOS
  # system using a disk NFS mounted from OpenBSD, the above fails like this:
  # mkfifo: cannot make fifo `fifo-10558': Not owner
  echo '********************************************'
  echo 'NOTICE: unable to create test prerequisites'
  echo '********************************************'
  exit 77
fi

fail=0

touch $tmp || fail=1
rm -rf $tmp

exit $fail