main(argc, argv) int argc; char *argv[]; { =20 struct hostent *hostp; struct servent *servp;=20 struct sockaddr_in server; int sock;=20 static struct timeval timeout =3D { 5, 0 }; /* five seconds */=20 fd_set rmask, xmask, mask; char buf[BUFSIZ];=20 int nfound, bytesread; if (argc !=3D 3) {=20 (void) fprintf(stderr,"usage: %s service host\n",argv[0]);=20 exit(1); }=20 if ((sock =3D socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {=20 perror("socket"); exit(1); }=20 if (isdigit(argv[1][0])) { static struct servent s;=20 servp =3D &s;=20 s.s_port =3D htons((u_short)atoi(argv[1])); } else if ((servp =3D getservbyname(argv[1], "tcp")) =3D=3D 0) {=20 fprintf(stderr,"%s: unknown service\n",argv[1]);=20 exit(1); }=20 if ((hostp =3D gethostbyname(argv[2])) =3D=3D 0) {=20 fprintf(stderr,"%s: unknown host\n",argv[2]);=20 exit(1); }=20 memset((void *) &server, 0, sizeof server); server.sin_family =3D AF_INET;=20 memcpy((void *) &server.sin_addr, hostp->h_addr, hostp->h_length);=20 server.sin_port =3D servp->s_port;=20 if (connect(sock, (struct sockaddr *) &server, sizeof server) < 0) {=20 (void) close(sock); perror("connect"); =20 exit(1); } FD_ZERO(&mask); =20 FD_SET(sock, &mask); FD_SET(fileno(stdin), &mask);=20 for (;;) { rmask =3D mask;=20 nfound =3D select(FD_SETSIZE, &rmask, (fd_set *)0, (fd_set *)0, = &timeout);=20 if (nfound < 0) { if (errno =3D=3D EINTR) {=20 printf("interrupted system call\n");=20 continue; }=20 /* something is very wrong! */=20 perror("select"); exit(1);=20 } if (nfound =3D=3D 0) {=20 /* timer expired */=20 printf("Please type something!\n");=20 continue; }=20 if (FD_ISSET(fileno(stdin), &rmask)) {=20 /* data from keyboard */ =20 if (!fgets(buf, sizeof buf, stdin)) { =20 if (ferror(stdin)) {=20 perror("stdin");=20 exit(1); }=20 exit(0); }=20 if (write(sock, buf, strlen(buf)) < 0) {=20 perror("write"); exit(1);=20 } }=20 if (FD_ISSET(sock,&rmask)) {=20 /* data from network */=20 bytesread =3D read(sock, buf, sizeof buf);=20 buf[bytesread] =3D '\0';=20 printf("%s: got %d bytes: %s\n", argv[0], bytesread, buf);=20 } } } /* main - client.c */ =20 ------=_NextPart_000_0008_01BFCE25.75CC5360 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi all,

For a project I need a small program = using a=20 socket to communicate with a server so I downloaded and installed = cygwin/gcc,=20 got an example program from the net and compiled (and updated in.h and = compiled=20 again). No errors.

When I run the program (on Win98), = see below, I=20 get the message 'The descriptor is a file, not a socket'. I scanned the = mailing=20 lists , and the net, but am stuck.

Please help, thanks,

Peter

This is the program, I call it like = this 'client=20 1685 164.139.146.156'

#include = <sys/types.h>
#include=20 <sys/socket.h>
#include <sys/time.h>
#include=20 <netinet/in.h>
#include <errno.h>
#include=20 <ctype.h>
#include <netdb.h>
#include=20 <stdio.h>
#include <string.h>

main(argc, argv)
int=20 argc;
char *argv[];
{

struct = hostent=20 *hostp;
struct servent *servp;
struct sockaddr_in=20 server;
int sock;
static struct timeval timeout =3D { = 5, 0=20 }; /* five seconds */
fd_set rmask, xmask,=20 mask;
char buf[BUFSIZ]; =
=20 int nfound, bytesread;

if (argc !=3D 3) {
= (void)=20 fprintf(stderr,"usage: %s service host\n",argv[0]);
= exit(1);
}
if ((sock =3D socket(AF_INET, SOCK_STREAM, = IPPROTO_TCP)) < 0) {
perror("socket");
= exit(1);
}
        if=20 (isdigit(argv[1][0])) {
static struct servent s;
= servp =3D=20 &s;
s.s_port =3D = htons((u_short)atoi(argv[1]));
} else if=20 ((servp =3D getservbyname(argv[1], "tcp")) =3D=3D 0) { =
=20 fprintf(stderr,"%s: unknown service\n",argv[1]);
=20 exit(1);
}
        if = ((hostp =3D=20 gethostbyname(argv[2])) =3D=3D 0) {
fprintf(stderr,"%s: = unknown=20 host\n",argv[2]);
exit(1);
} =
memset((void *)=20 &server, 0, sizeof server);
server.sin_family =3D AF_INET;=20
memcpy((void *) &server.sin_addr, hostp->h_addr,=20 hostp->h_length);
server.sin_port =3D servp->s_port; =
if=20 (connect(sock, (struct sockaddr *) &server, sizeof server) < 0) { =
(void) close(sock);
= perror("connect"); =20
exit(1);
}
FD_ZERO(&mask); =20
FD_SET(sock, &mask);
FD_SET(fileno(stdin), = &mask);=20
for (;;) {
rmask =3D mask;
nfound =3D=20 select(FD_SETSIZE, &rmask, (fd_set *)0, (fd_set *)0, &timeout);=20
if (nfound < 0) {
   if (errno =3D=3D EINTR) = {=20
    printf("interrupted system call\n");=20
    continue;
   }
   /* = something=20 is very wrong! */
   = perror("select");
  =20 exit(1);
}
if (nfound =3D=3D 0) {
   = /* timer=20 expired */
   printf("Please type = something!\n");=20
   continue;
}
if = (FD_ISSET(fileno(stdin),=20 &rmask)) {
   /* data from keyboard */ =
  =20 if (!fgets(buf, sizeof buf, stdin)) {
    if=20 (ferror(stdin)) {
     = perror("stdin");=20
     exit(1);
    }=20
    exit(0);
   }
   if=20 (write(sock, buf, strlen(buf)) < 0) {
   =20 perror("write");
    exit(1); =
  =20 }
}
if (FD_ISSET(sock,&rmask)) { =
   /*=20 data from network */
   bytesread =3D read(sock, buf, = sizeof buf);=20
   buf[bytesread] =3D '\0';
   = printf("%s: got %d=20 bytes: %s\n", argv[0], bytesread, buf);
= }
}
} /*=20 main - client.c */

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