I'm working on 1.5 jdk certification on 5.4 and 6.0. One of the jck
tests hangs on 5.4 but works ok on 6.0. I've reduced the problem
down to the following C program that hangs on 5.4 but works fine
(finishes) on 6.0 and 4.11.
I could use some assistance with finding a work-around to the
problem or an explanation as to why the program hangs on 5.4.
Thank you,
-Kurt
#include <stdio.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <netinet/in.h>
void
buildAddr4(struct sockaddr_in *addr4, int address, short port) {
memset((char *) addr4, 0, sizeof(struct sockaddr_in));
addr4->sin_port = htons(port);
addr4->sin_addr.s_addr = (uint32_t) htonl(address);
addr4->sin_family = AF_INET;
}
void
setAddress(struct sockaddr_in *addr4, int address) {
addr4->sin_addr.s_addr = (uint32_t) htonl(address);
}
int
getHostAddress() {
char hostname[MAXHOSTNAMELEN];
struct addrinfo hints, *res;
int address = 0;
if (gethostname(hostname, MAXHOSTNAMELEN) != 0)
exit(1);
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
hints.ai_family = AF_INET;
if(getaddrinfo(hostname, "domain", &hints, &res) != 0)
exit(1);
while( res != NULL ) {
if (res->ai_family == AF_INET) {
address = ntohl(((struct sockaddr_in*)(res->ai_addr))->sin_addr.s_addr);
break;
}
res = res->ai_next;
}
return address;
}
int
main() {
int sock1, sock2;
int optval = 1;
struct sockaddr addr;
struct sockaddr sock1Addr, sock2Addr;
int sock1AddrLen, sock2AddrLen;
short port1, port2;
char sendBuf, readBuf;
int hostAddress;
if ((hostAddress = getHostAddress()) == 0)
exit(1);
buildAddr4((struct sockaddr_in *)&addr, 0, 0);
if ((sock1 = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
exit(1);
if (setsockopt(sock1, SOL_SOCKET, SO_BROADCAST, (char*) &optval,
sizeof(optval)) != 0)
exit(1);
if (bind(sock1, (struct sockaddr *)&addr, sizeof(struct sockaddr_in)) != 0)
exit(1);
if (getsockname(sock1, &sock1Addr, &sock1AddrLen) != 0)
exit(1);
setAddress((struct sockaddr_in *)&sock1Addr, hostAddress);
if ((sock2 = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
exit(1);
if (bind(sock2, (struct sockaddr *)&addr, sizeof(struct sockaddr_in)) != 0)
exit(1);
if (getsockname(sock2, &sock2Addr, &sock2AddrLen) != 0)
exit(1);
setAddress((struct sockaddr_in *)&sock2Addr, hostAddress);
if (connect(sock2, &sock1Addr, sock1AddrLen) != 0)
exit(1);
sendBuf = 22;
if (sendto(sock1, &sendBuf, 1, 0, &sock2Addr, sock2AddrLen) != 1)
exit(1);
if (read(sock2, &readBuf, 1) != 1)
exit(1);
printf("no hang\n");
}
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