On Mon, Oct 11, 2010 at 2:42 PM, Gilles Chanteperdrix <
gilles.chanteperd...@xenomai.org> wrote:
> Johan Cockx wrote:
> >
> >
> > On Fri, Oct 8, 2010 at 11:16 AM, Gilles Chanteperdrix
> > <gilles.chanteperd...@xenomai.org
> > <mailto:gilles.chanteperd...@xenomai.org>> wrote:
> >
> > Johan Cockx wrote:
> > > Yes XENO_OPT_POSIX_SELECT is enabled and the xeno_posix module is
> > loaded.
> >
> > Ok. So, next question, are you sure you use the Xenomai posix skin
> > wrapped select? You can try and put a printk in Xenomai's select
> syscall
> > implementation to be sure that you go there.
> >
> >
> > Ok; it seems that I am not using the posix skin wrapped select: I added
> > a printk in the select syscall and it doesn't appear in the output of
> dmesg.
> >
> > I am using `xeno-config --posix-cflags` for compilation and
> > `xeno-config --posix-ldflags` for linking. What else could be wrong?
>
> If you have a self-contained test case which allow to reproduce reliably
> this issue, and you are 100% sure that the kernel you are running has
> XENO_OPT_POSIX_SELECT. Please send it to the xenomai-help mailing list.
>
A printf in src/skins/posix/select.c confirms that __wrap_select is called.
In ksrc/skins/posix/syscall.c, I added the following lines:
#ifndef CONFIG_XENO_OPT_POSIX_SELECT
#error XENO_OPT_POSIX_SELECT not enabled
#endif
It still compiles, so I am quite sure that XENO_OPT_POSIX_SELECT is
enabled.
Attached is a small stand-alone test case. It consists of two programs:
recv.c will wait for a udp message with a timeout of 10 sec (using select),
and send.c will send a udp message. If recv is started and then send (in
another terminal), recv should return immediatly without timeout;
however, it continues to wait until a timeout occurs.
gcc -Wall `xeno-config --posix-cflags` `xeno-config --posix-ldflags` send.c
-o send
gcc -Wall `xeno-config --posix-cflags` `xeno-config --posix-ldflags` recv.c
-o recv
./recv # In one terminal
./send hello <ip-address> # In another terminal, within 10 sec
I am currently running kernel version 2.6.26.8-ipipe-2.0-18, Xenomai 2.4 and
gcc 4.3.2.
Johan
> --
> Gilles.
>
#include <err.h>
#include <string.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdio.h>
int main(int argc, char **argv) {
if (argc > 2) {
errx(1,"Usage: %s [<port>]",argv[0]);
}
int port = argc > 1 ? atoi(argv[1]): 32641;
// Create socket
int sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sock < 0) err(1,"cannot create socket");
// Bind socket to port number
struct sockaddr_in address;
memset(&address, 0, sizeof(address));
address.sin_family = PF_INET;
address.sin_addr.s_addr = htonl(INADDR_ANY);
address.sin_port = htons(port);
if (bind(sock,(struct sockaddr *)&address,sizeof(address)) < 0) {
close(sock);
err(1,"cannot bind to port %d",port);
}
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(sock,&rfds);
struct timeval tv;
tv.tv_sec = 10;
tv.tv_usec = 0;
#if 1
int rv = select(sock+1,&rfds,NULL,NULL,&tv);
if (rv < 0) err(1,"cannot select");
if (rv == 0) {
fprintf(stderr,"timeout\n");
}
// Try to read a udp message anyway.
#else
if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,(char *)&tv,
sizeof(struct timeval)) == -1
) {
err(1,"cannot set timeout on socket");
}
#endif
char message[81] = { 0, };
if (recv(sock,message,sizeof(message)-1,0) < 0) {
err(1,"cannot receive data");
}
printf("message: %s\n",message);
return 0;
}
#include <err.h>
#include <string.h>
#include <stdlib.h>
#include <netdb.h>
#include <assert.h>
#include <unistd.h>
#include <stdio.h>
//------------------------------------------------------------------------------
int main(int argc, char *argv[]) {
if (argc < 3 || argc > 4) {
errx(1,"Usage: %s <data> <host> [<port>]",argv[0]);
}
char *data = argv[1];
size_t size = strlen(data);
char *hostname = argv[2];
int port = argc > 3 ? atoi(argv[3]): 32641;
// Initialize socket and daemon address
int sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sock < 0) {
err(1,"cannot create socket");
}
struct hostent *host = gethostbyname(hostname);
if (host->h_addrtype != AF_INET) {
errx(1,"unsupported host type %d, only IPv4 is supported",host->h_addrtype);
}
struct sockaddr_in daemon_address;
memset(&daemon_address, 0, sizeof(daemon_address));
daemon_address.sin_family = PF_INET;
assert(host->h_length <= sizeof(daemon_address.sin_addr.s_addr));
memcpy(&daemon_address.sin_addr.s_addr,host->h_addr,host->h_length);
daemon_address.sin_port = htons(port);
if (
sendto(sock,data,size,0,
(struct sockaddr*)&daemon_address,sizeof(daemon_address)
) < 0
) {
err(1,"cannot send data");
}
close(sock);
return 0;
}
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