I have a problem that is similar to the problem described in http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/22868
My program, that opens a tcp socket and binds to INADDR_ANY:0, getsockname() returns either the correct answer
or, for some time, a wrong answer, see below
(this is of course not my program, just some code that does the same)
--- snipp --- #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <string.h> #include <stdlib.h> #include <netinet/in.h> #include <arpa/inet.h>
int main()
{
int sock, len;
struct sockaddr_in addr, foo; if((sock=socket(AF_INET, SOCK_STREAM, 0))<0)
{
exit(0);
} memset(&addr, 0, sizeof(struct sockaddr_in));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(0);if(bind(sock, (struct sockaddr *) &addr, sizeof(struct sockaddr_in))<0)
{
perror("bind");
exit(0);
}
if(listen(sock, 5)<0)
{
perror("listen");
exit(0);
}getsockname(sock, (struct sockaddr *) &foo, &len);
fprintf(stderr, "listening on %s:%d\n", inet_ntoa(foo.sin_addr), ntohs(foo.sin_port));
return 0; }
--- snap ---
$ ./a.out listening on 86.186.4.40:49087 $ ./a.out listening on 0.0.0.0:3810
regards, Chris
PS: It is even stranger than I thought, I compiled this program: gcc -o freebsd freebsd.c and ran it serveral times:
$ ./freebsd
listening on 86.186.4.40:49087
$ mv freebsd a.out
$ ./a.out
listening on 0.0.0.0:4364
$ mv a.out freebsd
$ ./freebsd
listening on 86.186.4.40:49087
$ mv freebsd a.out
$ ./a.out
listening on 0.0.0.0:4604
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