Seen with krun: we get a file descriptor via --fd, but we close it and happily use the same number for TCP files. The issue is that if we also get other options before --fd, with arguments, getopt_long() stops parsing them because it sees them as non-option values. Use the - modifier at the beginning of optstring, instead of +, which means we'll continue parsing after finding unrelated option values, but getopt_long() won't reorder them anyway: they'll be passed with option value '1', which we can ignore. By the way, we also need to add : after F in the optstring, so that we're able to parse the option when given as short name as well. Link: https://github.com/slp/krun/issues/17#issuecomment-2294943828 Fixes: baccfb95ce0e ("conf: Stop parsing options at first non-option argument") Fixes: 09603cab28f9 ("passt, util: Close any open file that the parent might have leaked") Signed-off-by: Stefano Brivio --- util.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/util.c b/util.c index 0b41404..3fce3c2 100644 --- a/util.c +++ b/util.c @@ -710,7 +710,7 @@ void close_open_files(int argc, char **argv) int name, rc; do { - name = getopt_long(argc, argv, "+:F", optfd, NULL); + name = getopt_long(argc, argv, "-:F:", optfd, NULL); if (name == 'F') { errno = 0; -- 2.43.0