Socket - connect problem: The descriptor is a file, not a socket

["Parker, Ron" <rdparker at butlermfg dot com>]

If I had to guess, it sounds your program is somehow calling the Microsoft
WinSock version of select instead of the cygwin one.  If you could give the
actual commands that were used to compile and link it might help.

(I have included the text of the original message with all of the HTML
encoding removed, since I know some of the main contributors to this list do
not read HTML mail.)

-----Original Message-----
From: Peter P. Mooring [mailto:peterpm@xs4all.nl]
Sent: Sunday, June 04, 2000 6:05 AM
To: cygwin@sourceware.cygnus.com
Subject: Socket - connect problem: The descriptor is a file, not a socket


Hi all,
For a project I need a small program using a socket to communicate with a
server so I downloaded and installed cygwin/gcc, got an example program from
the net and compiled (and updated in.h and compiled again). No errors.
When I run the program (on Win98), see below, I get the message 'The
descriptor is a file, not a socket'. I scanned the mailing lists , and the
net, but am stuck. 
Please help, thanks,
Peter
 
This is the program, I call it like this 'client 1685 164.139.146.156'
 
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <errno.h>
#include <ctype.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
 
main(argc, argv)
 int argc;
 char *argv[];
 {
 
 struct hostent *hostp;
 struct servent *servp; 
 struct sockaddr_in server;
 int sock; 
 static struct timeval timeout = { 5, 0 };   /* five seconds */ 
 fd_set rmask, xmask, mask;
 char buf[BUFSIZ]; 
        int nfound, bytesread;
 
 if (argc != 3) { 
  (void) fprintf(stderr,"usage: %s service host\n",argv[0]); 
  exit(1);
 } 
 if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) { 
  perror("socket");
  exit(1);
 } 
        if (isdigit(argv[1][0])) {
  static struct servent s; 
  servp = &s; 
  s.s_port = htons((u_short)atoi(argv[1]));
 } else if ((servp = getservbyname(argv[1], "tcp")) == 0) { 
  fprintf(stderr,"%s: unknown service\n",argv[1]); 
  exit(1);
 } 
        if ((hostp = gethostbyname(argv[2])) == 0) { 
  fprintf(stderr,"%s: unknown host\n",argv[2]); 
  exit(1);
 } 
 memset((void *) &server, 0, sizeof server);
 server.sin_family = AF_INET; 
 memcpy((void *) &server.sin_addr, hostp->h_addr, hostp->h_length); 
 server.sin_port = servp->s_port; 
 if (connect(sock, (struct sockaddr *) &server, sizeof server) < 0) { 
  (void) close(sock);
  perror("connect");  
  exit(1);
 }
 FD_ZERO(&mask);  
 FD_SET(sock, &mask);
 FD_SET(fileno(stdin), &mask); 
 for (;;) {
  rmask = mask; 
  nfound = select(FD_SETSIZE, &rmask, (fd_set *)0, (fd_set *)0, &timeout); 
  if (nfound < 0) {
   if (errno == EINTR) { 
    printf("interrupted system call\n"); 
    continue;
   } 
   /* something is very wrong! */ 
   perror("select");
   exit(1); 
  }
  if (nfound == 0) { 
   /* timer expired */ 
   printf("Please type something!\n"); 
   continue;
  } 
  if (FD_ISSET(fileno(stdin), &rmask)) { 
   /* data from keyboard */  
   if (!fgets(buf, sizeof buf, stdin)) {  
    if (ferror(stdin)) { 
     perror("stdin"); 
     exit(1);
    } 
    exit(0);
   } 
   if (write(sock, buf, strlen(buf)) < 0) { 
    perror("write");
    exit(1); 
   }
  } 
  if (FD_ISSET(sock,&rmask)) { 
   /* data from network */ 
   bytesread = read(sock, buf, sizeof buf); 
   buf[bytesread] = '\0'; 
   printf("%s: got %d bytes: %s\n", argv[0], bytesread, buf); 
  }
 }
} /* main - client.c */


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