Re: [Libguestfs] [nbdkit PATCH v2 3/3] server: More tests of stdin/out handling

Enhance the testsuite to ensure we don't regress with recent changes to stdin/out handling. This adds: - test-single-sh.sh: prove that 'nbdkit -s sh script' is viable - test-stdio.sh: create plugin that checks stdin/out match /dev/null, then run it with -s, --run, -f Signed-off-by: Eric Blake <eblake(a)redhat.com&gt;

+/* Check whether stdin/out match /dev/null */ +static bool +stdio_check (void) +{ + static int dn = -1; + struct stat st1, st2; + + if (dn == -1) { + dn = open ("/dev/null", O_RDONLY); + assert (dn > STDERR_FILENO); + } + if (fstat (dn, &st1) == -1) + assert (false); + + if (fstat (STDIN_FILENO, &st2) == -1) + assert (false); + if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) + return false; + + if (fstat (STDOUT_FILENO, &st2) == -1) + assert (false); + if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) + return false; + + return true; +}