Defect report: ENOTSOCK on close

["Christopher Yeleigton" <program dot spe at home dot pl>]

Summary:
Unexpected error ENOTSOCK upon closing filedes[0] obtained via socketpair

Test case:

#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>

int main(int argc, char *argv[])
{
auto int a_fd[02];
if(socketpair(AF_LOCAL, SOCK_STREAM, 0, a_fd))
perror("socketpair");
else
{
auto int an_ix = 0;
for(; an_ix < 02; ++an_ix)
if(close(a_fd[an_ix]))
  { enum BufLen { BUF_LEN = 040 };
auto char a_buf[BUF_LEN];
perror(snprintf(a_buf, BUF_LEN, "close %d", an_ix) > 0? a_buf:
"sprintf"); }}
return EXIT_SUCCESS; }

Error message:
close 0: Socket operation on non-socket

(Note it occurs with filedes[0] only, even if close is called for filedes[1]
first).

OpenBSD does not exhibit this malfunction.

Best regards,
Chris

Attachment: cygcheck.txt
Description: Text document

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