> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf > Of Corinna Vinschen > Sent: Tuesday, January 01, 2002 4:07 PM > To: [EMAIL PROTECTED] > Subject: Re: duplicate regexec/regcomp functions detected > > > On Mon, Dec 31, 2001 at 07:53:28PM +0100, Ralf Habacker wrote: > > > >- unix domain socket - The above mentioned os supports creating unix > > > >domain sockets with previous existing files. On cygwin the unix domain > > > >sockets couldn't be bound on existing files, so it has to be removed > > > >first. > > > > > > Sounds like a bug. Submit a patch. > > It's not a bug, it's Linux compliant behaviour. Try the following > code on Linux and Cygwin: > > ================================== SNIP ============================== > #include <stdio.h> > #include <errno.h> > #include <sys/socket.h> > #include <sys/un.h> > > int > main(int argc, char **argv) > { > int sockfd; > socklen_t len; > struct sockaddr_un addr1, addr2; > > if (argc != 2) > { > fprintf (stderr, "Idiot\n"); > return 1; > } > sockfd = socket (AF_LOCAL, SOCK_STREAM, 0); > if (sockfd < 0) > { > fprintf (stderr, "socket: %d, %s\n", errno, strerror (errno)); > return 1; > } > memset (&addr1, 0, sizeof addr1); > addr1.sun_family = AF_LOCAL; > strncpy (addr1.sun_path, argv[1], sizeof addr1.sun_path - 1); > if (bind (sockfd, (struct sockaddr *) &addr1, SUN_LEN (&addr1)) < 0) > { > fprintf (stderr, "bind: %d, %s\n", errno, strerror (errno)); > return 1; > } > len = sizeof addr2; > if (getsockname (sockfd, (struct sockaddr *) &addr2, &len) < 0) > { > fprintf (stderr, "getsockname: %d, %s\n", errno, strerror (errno)); > return 1; > } > printf ("bound name = %s, returned len = %d\n", addr2.sun_path, len); > return 0; > } > ================================== SNAP ============================== > > Linux: > ------ > $ gcc -o uds uds.c > $ ./uds /tmp/foo.bar > bound name = /tmp/foo.bar, returned len = 15 > $ ./uds /tmp/foo.bar > bind: 98, Address already in use > > Cygwin: > ------- > $ gcc -o uds uds.c > $ ./uds /tmp/foo.bar > bound name = <some random string here>, returned len = 16 > $ ./uds /tmp/foo.bar > bind: 112, Address already in use > > That shows that Cygwin's getsockname() doesn't return a correct > sockname for unix domain sockets but the bind() call behaves > correct. An application that depends on (actually undocumented) > behaviour that a unix domain socket can be rebound is doing something > wrong.
Thanks for this hints. While porting kdelibs I have had to explicity closed and delete the socket file before I can bound to it (which wasn't used under other ported os) and as I found the decribed code in the bind() function, the first thoughts was that this may be the problem. After this correction I will look at the kde code to identify the called functions. Perhaps the problem is the getsockname(). After looking in the code I have an additional question. Does cygwin and linux differs in the possibilites of deleting of open files ? This could be a difference, because I have found that before binding an unlink() is made, but fails. Ralf -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
