Am 31.07.2011 11:50, schrieb Christoph P.U. Kukulies:
I have written a small to test TCP/IP roundtrip times of the packets
in a proprietary protocol and while
compiling and running this server on different platforms (Windows
7/cygwin, UbuntuLinux, FreeBSD 8.0 Release), I found
that the server produces an error when the listening socket (on which
the accpet() is performed) is member of the select()
fd_set.
On the other platforms the program works without error, just under
FreeBSD I'm getting this "invalid argument" error.
Comments appreciated (despite comments about the error checking logic :)
Here is the code:
// testsrv.c
// gcc -o testsrv testsrv.c
//
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <string.h>
#include <sys/select.h>
#define USEDBUFSIZ 60
#define MAX_HOSTNAME 256
#define MAXFDS 256
#define CLRBUF memset(buf,0,sizeof(buf))
#define max(a,b) (((a) > (b)) ? (a) : (b))
static unsigned char buf[256];
int array_of_fds[MAXFDS];
static fd_set clientfds;
#define SOCKET int
void *memset(void *, int, size_t);
int enter (int);
int remov (int);
int invalidip (char *);
void exit (int);
int getv (int, unsigned char *, int);
int getfds ();
int
main(int argc, char **argv)
{
int nfds;
static fd_set readfds;
SOCKET ListenSocket, newsockfd;
struct sockaddr_in cli_addr;
struct sockaddr_in service;
struct hostent *thisHost;
int bOptVal = 0;
int bOptLen = sizeof(int);
char hostname[256];
char *host_addr;
struct in_addr addr = {0};
char *ip;
u_short port;
int iResult = 0;
int i , n, m, clilen, dummy, connect = 0;
struct timeval tv;
//---------------------------------------
//Create a listening socket
ListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (ListenSocket == -1) {
perror("socket creation");
return 1;
} else
printf("ListenSocket=%d\n", ListenSocket);
//---------------------------------------
//Bind the socket to the local IP address
// and port 3210
port = 3210;
if (gethostname(hostname, 256))
perror("gethostname failed\n"), exit(3);
printf("%s\n", hostname), fflush(stdout);
thisHost = gethostbyname(hostname);
ip = inet_ntoa(*(struct in_addr *)(*thisHost->h_addr_list));
if (argc == 2) {
host_addr = argv[1];
service.sin_addr.s_addr = inet_addr(host_addr);
thisHost = gethostbyaddr((const char *)&service.sin_addr.s_addr,
sizeof(service.sin_addr.s_addr),
AF_INET);
if (thisHost == 0)
printf("host unknown\n"), exit(3);
if (invalidip(host_addr))
printf("invalid IP\n"), exit(4);
} else {
service.sin_addr.s_addr = inet_addr(ip);
}
service.sin_port = htons(port);
service.sin_family = AF_INET;
iResult = bind(ListenSocket, (struct sockaddr *)&service,
sizeof(service));
if (iResult == -1) {
perror("bind");
shutdown(ListenSocket, SHUT_RDWR);
return 1;
}
listen(ListenSocket, SOMAXCONN);
printf("SOMAXCONN=%d %d\n", SOMAXCONN, FD_SETSIZE);
/* all sockets are put into an own array_of_fs */
/* in the while() loop below the FD_SET id used by looping through
the */
/* array_of_fds to fill the readfds array in the select() */
enter(ListenSocket);
/*
* Wait for connect
*/
tv.tv_sec = 0;
tv.tv_usec = 5000000; /* 5 seconds */
A friendly soul on FreeBSD-hackers told me that my
tv_usec value is wrong in the timeval struct above. FreeBSD checks if it
is in the range of
0<tv_usec<1000000 and not negative.
How I came to think that the socket could be the invaid parameter, I
don't know.
Maybe I did two changes to the code at once and was blaming the wrong one.
Thanks anyway for listening.
--
Christoph
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