Date: Wed, 7 Jan 2004 21:46:28 +0100 From: Christian Klein <chris@schwer.bewaff.net> To: freebsd-stable@freebsd.org Subject: getsockname() Message-ID: <91136089-4152-11D8-942B-000393076EEC@schwer.bewaff.net>
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Hi, 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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