bad file descriptor with close() socket (c++)
- by user321246
hi everybody!
I'm running out of file descriptors when my program can't connect another host. The close() system call doesn't work, the number of open sockets increases. I can se it with
cat /proc/sys/fs/file-nr
Print from console:
connect: No route to host
close: Bad file descriptor
connect: No route to host
close: Bad file descriptor
..
Code:
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
#include <iostream>
using namespace std;
#define PORT 1238
#define MESSAGE "Yow!!! Are we having fun yet?!?"
#define SERVERHOST "192.168.9.101"
void
write_to_server (int filedes)
{
int nbytes;
nbytes = write (filedes, MESSAGE, strlen (MESSAGE) + 1);
if (nbytes < 0)
{
perror ("write");
}
}
void
init_sockaddr (struct sockaddr_in *name,
const char *hostname,
uint16_t port)
{
struct hostent *hostinfo;
name->sin_family = AF_INET;
name->sin_port = htons (port);
hostinfo = gethostbyname (hostname);
if (hostinfo == NULL)
{
fprintf (stderr, "Unknown host %s.\n", hostname);
}
name->sin_addr = *(struct in_addr *) hostinfo->h_addr;
}
int main()
{
for (;;)
{
sleep(1);
int sock;
struct sockaddr_in servername;
/* Create the socket. */
sock = socket (PF_INET, SOCK_STREAM, 0);
if (sock < 0)
{
perror ("socket (client)");
}
/* Connect to the server. */
init_sockaddr (&servername, SERVERHOST, PORT);
if (0 > connect (sock,
(struct sockaddr *) &servername,
sizeof (servername)))
{
perror ("connect");
sock = -1;
}
/* Send data to the server. */
if (sock > -1)
write_to_server (sock);
if (close (sock) != 0)
perror("close");
}
return 0;
}
