Hi,
I'm currently developping an application with bluez. I wrote a little cod=
e to=20
test the alarm behaviour with bluez sockets code.
The connect and read (or recv) get interrupted but errno is set to ESPIPE=
(29)=20
instead of EINTR (4). Does any one of you guys know why i'm getting this=20
illegal seek operation errno ?
Regards,
my sample code is below :
#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/l2cap.h>
#include <sys/ioctl.h>
#include <errno.h>
extern int errno;
void alarm_handler(int sig) {
=09printf ("IN alarm_handler\n");
}
int get_socket(char* watch_addr) {
=09int s;
=09struct sockaddr_l2 addr;
=09bdaddr_t bdaddr;
=09if ((s =3D socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP)) < 0) {
=09=09perror("Can't create socket ");
=09=09return 0;
=09}
=09bacpy(&bdaddr, BDADDR_ANY);
=09memset(&addr, 0, sizeof(addr));
=09addr.l2_family =3D AF_BLUETOOTH;
=09addr.l2_bdaddr =3D bdaddr;
=09addr.l2_psm =3D htobs(0XCC33);
if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
=09=09perror("Can't bind socket ");
=09=09return 0;
}
=09baswap(&addr.l2_bdaddr, strtoba(watch_addr));
if (connect(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
=09=09perror("Can't connect ");
=09=09printf ("errno : %d\n", errno);
=09=09return 0;
}
=09return s;
}
char* attends_data(int s) {
=09int i;
=09int encore =3D 0;
=09char buff[256];
=09encore =3D read(s, buff, 256);
=09if (encore =3D=3D -1 || errno) {
=09=09perror("Echec lors de la lecture");
=09=09return NULL;
=09}
=09return NULL;
}
int main (void) {
=09int aSocket;
=09signal (SIGALRM, alarm_handler);
=09siginterrupt (SIGALRM, 1);
=09alarm(20);
=09printf ("Connexion ! \n");
=09aSocket =3D get_socket ("00:04:76:f1:6c:f9");
=09if (aSocket) {
=09=09printf ("Connect=E9 ! \n");
=09=09alarm(5);
=09=09printf ("Lecture ! \n");
=09=09if (!attends_data (aSocket)) {
=09=09=09printf ("errno : %d\n", errno);
=09=09} else {
=09=09=09printf ("OK !\n");
=09=09=09alarm(0);
=09=09}
=09=09shutdown (aSocket, 2);
=09}
=09close (aSocket);
}
--=20
Xavier Garreau
http://www.xgarreau.org
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Hi Xavier,
> I'm currently developping an application with bluez. I wrote a little code to
> test the alarm behaviour with bluez sockets code.
>
> The connect and read (or recv) get interrupted but errno is set to ESPIPE (29)
> instead of EINTR (4). Does any one of you guys know why i'm getting this
> illegal seek operation errno ?
I don't see any usage of ESPIPE in L2CAP, so this can be a general
behaviour of the socket code. What errno do you get if you try this with
TCP socket code?
BTW what kernel and/or patches do you use?
Regards
Marcel
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Xavier Garreau wrote:
> Hi,
>
> I'm currently developping an application with bluez. I wrote a little code to
> test the alarm behaviour with bluez sockets code.
>
> The connect and read (or recv) get interrupted but errno is set to ESPIPE (29)
> instead of EINTR (4). Does any one of you guys know why i'm getting this
> illegal seek operation errno ?
>
> Regards,
>
> my sample code is below :
>
> #include <signal.h>
> #include <unistd.h>
> #include <stdio.h>
> #include <sys/socket.h>
> #include <netinet/in.h>
> #include <bluetooth/bluetooth.h>
> #include <bluetooth/hci.h>
> #include <bluetooth/hci_lib.h>
> #include <bluetooth/l2cap.h>
> #include <sys/ioctl.h>
> #include <errno.h>
>
> extern int errno;
>
> void alarm_handler(int sig) {
> printf ("IN alarm_handler\n");
> }
>
> int get_socket(char* watch_addr) {
> int s;
> struct sockaddr_l2 addr;
> bdaddr_t bdaddr;
>
>
> if ((s = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP)) < 0) {
> perror("Can't create socket ");
> return 0;
> }
>
> bacpy(&bdaddr, BDADDR_ANY);
> memset(&addr, 0, sizeof(addr));
> addr.l2_family = AF_BLUETOOTH;
> addr.l2_bdaddr = bdaddr;
> addr.l2_psm = htobs(0XCC33);
>
> if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
> perror("Can't bind socket ");
> return 0;
> }
>
> baswap(&addr.l2_bdaddr, strtoba(watch_addr));
> if (connect(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
> perror("Can't connect ");
> printf ("errno : %d\n", errno);
> return 0;
> }
> return s;
> }
>
> char* attends_data(int s) {
> int i;
> int encore = 0;
> char buff[256];
>
> encore = read(s, buff, 256);
> if (encore == -1 || errno) {
> perror("Echec lors de la lecture");
> return NULL;
> }
> return NULL;
> }
>
>
> int main (void) {
> int aSocket;
>
> signal (SIGALRM, alarm_handler);
> siginterrupt (SIGALRM, 1);
>
> alarm(20);
> printf ("Connexion ! \n");
> aSocket = get_socket ("00:04:76:f1:6c:f9");
>
> if (aSocket) {
> printf ("Connect? ! \n");
> alarm(5);
> printf ("Lecture ! \n");
> if (!attends_data (aSocket)) {
> printf ("errno : %d\n", errno);
> } else {
> printf ("OK !\n");
> alarm(0);
> }
> shutdown (aSocket, 2);
> }
> close (aSocket);
> }
>
Hi Xavier,
I don't know why ESPIPE error.
But after a connect I negociate the MTU and MRU and I haven'y noticed
any error with a recv() :
(g_error()/g_message are GTK+ functions)
struct l2cap_options opts;
int opt;
.......
opt = sizeof(opts);
if( getsockopt(montre->sk_bluez, SOL_L2CAP, L2CAP_OPTIONS, &opts, &opt)
< 0 )
g_error("Can't get L2CAP options. %s(%d)", strerror(errno), errno);
else
g_message("Actual MTU is %d & MRU is %d ",opts.omtu,opts.imtu);
opts.imtu = MY_IMTU ;
opts.omtu = MY_OMTU ;
if (setsockopt(montre->sk_bluez, SOL_L2CAP, L2CAP_OPTIONS, &opts, opt) < 0)
g_error("Can't set L2CAP options. %s(%d)", strerror(errno), errno);
else
g_message("Setting MTU to %d & MRU to %d ",opts.omtu,opts.imtu);
.......
r=recv(s,&buff,sizeof(buff),0))
regards
Aurelien
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