Date: Sat, 28 Feb 1998 20:50:28 +0300 (MSK) From: Adel Abushaev <adel@ksu.ru> To: freebsd-bugs@FreeBSD.ORG Subject: Possible ioctl() implementation mistake Message-ID: <199802281750.UAA07054@alpha.ksu.ru>
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The following is bug report and test program.
First ioctl() is before recvfrom(), after client sent 512 bytes to the
SOCK_DGRAM destination. On all FreeBSD's which I find -ioctl() returns
528 bytes, and I read 512, then ioctl() returns 0.
Source code for test (lcient & server) at the end of message.
Adel Abushaev <adel@ksu.ru>, <adel@core.dumped.org>
---------------------------------------------------------------------------
FreeBSD jungle 2.2.1-RELEASE FreeBSD 2.2.1-RELEASE #0: Sat Feb 7 16:16:08 MVW 1998 az@jungle:/usr/src/sys/compile/jungle i386
ioctl: 528
recv: 512
ioctl: 0
---------------------------------------------------------------------------
FreeBSD shell.cifnet.com 2.2.5-STABLE
ioctl: 528
recv: 512
ioctl: 0
---------------------------------------------------------------------------
FreeBSD lapkin.rosprint.ru 3.0-CURRENT FreeBSD 3.0-CURRENT #0: Fri Jan 16 18:05:15 MSK 1998 sandy@lapkin.rosprint.ru:/m/FreeBSD-current/src/sys/compile/LAPKIN i386
ioctl: 528
recv: 512
ioctl: 0
---------------------------------------------------------------------------
Linux irc 2.0.33 #5 Wed Feb 4 04:43:29 WAT 1998 i586 unknown
ioctl: 512
recv: 512
ioctl: 0
---------------------------------------------------------------------------
SunOS alpha 5.5 Generic_103093-03 sun4c sparc SUNW,Sun_4_40
ioctl: 512
recv: 512
ioctl: 0
---------------------------------------------------------------------------
/* client.c */
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
void main()
{
int sockfd;
struct sockaddr_in servaddr_in;
char buffer[512];
memset(&servaddr_in, 0, sizeof(struct sockaddr_in));
servaddr_in.sin_family = AF_INET;
servaddr_in.sin_addr.s_addr = inet_addr("127.0.0.1");
servaddr_in.sin_port = htons(4000);
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd <= 0)
{
perror("socket"); return;
}
sendto(sockfd, buffer, 512, 0, (struct sockaddr *)&servaddr_in,
sizeof(struct sockaddr_in));
close(sockfd);
}
/* server.c */
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/stat.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#ifdef SOLARIS
#include <sys/filio.h>
#endif
void main()
{
int sockfd;
struct sockaddr_in myaddr_in, peeraddr_in;
unsigned addrlen;
char buffer[512];
struct timeval tim;
int optval;
fd_set fdsread, fdswrite, fdsexcept;
memset(&myaddr_in, 0, sizeof(struct sockaddr_in));
memset(&peeraddr_in, 0, sizeof(struct sockaddr_in));
myaddr_in.sin_family = AF_INET;
myaddr_in.sin_addr.s_addr = INADDR_ANY;
myaddr_in.sin_port = htons(4000);
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd <= 0)
{
perror("socket"); return;
}
if (bind(sockfd, (struct sockaddr *)&myaddr_in, sizeof(struct sockaddr_in))
< 0)
{
perror("bind"); return;
}
FD_ZERO(&fdsread); FD_ZERO(&fdswrite); FD_ZERO(&fdsexcept);
FD_SET(sockfd, &fdsread);
tim.tv_sec=60; tim.tv_usec=0;
select(sockfd+1, &fdsread, &fdswrite, &fdsexcept, &tim);
if (FD_ISSET(sockfd, &fdsread))
{
ioctl(sockfd, FIONREAD, &optval); printf("ioctl: %d\n",optval);
optval=recvfrom(sockfd, buffer, 512, 0, (struct sockaddr *)&peeraddr_in,
&addrlen); printf("recv: %d\n",optval);
ioctl(sockfd, FIONREAD, &optval); printf("ioctl: %d\n",optval);
}
close(sockfd);
}
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