How can I use SIGRTMIN + X Signals in Andorid NDK for Usb ISOCHRONOUS Transfers
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I am attempting to Submit ISOCHRONOUS URB in Android NDK in C.
usbdevfs_urb& urbRequest = *(usbdevfs_urb*)malloc( 384 );
urbRequest.type = USBDEVFS_URB_TYPE_ISO;
urbRequest.endpoint = mpEndpoint->GetEndpointAddress();//mpEndpoint->GetEndpointIndex();
urbRequest.status = 0;
urbRequest.flags = USBDEVFS_URB_ISO_ASAP;
urbRequest.buffer = pData;
urbRequest.buffer_length = 0;
urbRequest.actual_length = 0;
urbRequest.start_frame = 0;
urbRequest.number_of_packets = 1;
urbRequest.error_count = 0;
urbRequest.signr = SIGRTMIN;
urbRequest.usercontext = pData;
usbdevfs_iso_packet_desc* pIsoPacketDesc = &urbRequest.iso_frame_desc[0];
pIsoPacketDesc->length = 384;
pIsoPacketDesc->actual_length = 0;
pIsoPacketDesc->status = 0;
ioctl( fd, USBDEVFS_SUBMITURB, &usbRequest);
In the above code, I want to set SIGRTMIN signal for urbRequest.signr.
So that i can get the SIGRTMIN signal on URB completion and i can call REAP URB after
But in Android i am not getting the SIGRTMIN signal at all. Instead my app gets killed without any exception
is there any way i can use SIGRTMIN signal for submitting URB in Android?
Note: I tried using SIGUSR1 and SIGUSR2 signals but ART is catching those signals
is there anyway to do isochronous, interrupt, bulk transfer (using non blocking asynchronous IO) in Android?
android linux android-ndk signals ioctl asked Nov 23 '18 at 14:27
sunder kandasamysunder kandasamy
707
add a comment |
3
I am attempting to Submit ISOCHRONOUS URB in Android NDK in C.
usbdevfs_urb& urbRequest = *(usbdevfs_urb*)malloc( 384 );
urbRequest.type = USBDEVFS_URB_TYPE_ISO;
urbRequest.endpoint = mpEndpoint->GetEndpointAddress();//mpEndpoint->GetEndpointIndex();
urbRequest.status = 0;
urbRequest.flags = USBDEVFS_URB_ISO_ASAP;
urbRequest.buffer = pData;
urbRequest.buffer_length = 0;
urbRequest.actual_length = 0;
urbRequest.start_frame = 0;
urbRequest.number_of_packets = 1;
urbRequest.error_count = 0;
urbRequest.signr = SIGRTMIN;
urbRequest.usercontext = pData;
usbdevfs_iso_packet_desc* pIsoPacketDesc = &urbRequest.iso_frame_desc[0];
pIsoPacketDesc->length = 384;
pIsoPacketDesc->actual_length = 0;
pIsoPacketDesc->status = 0;
ioctl( fd, USBDEVFS_SUBMITURB, &usbRequest);
In the above code, I want to set SIGRTMIN signal for urbRequest.signr.
So that i can get the SIGRTMIN signal on URB completion and i can call REAP URB after
But in Android i am not getting the SIGRTMIN signal at all. Instead my app gets killed without any exception
is there any way i can use SIGRTMIN signal for submitting URB in Android?
Note: I tried using SIGUSR1 and SIGUSR2 signals but ART is catching those signals
is there anyway to do isochronous, interrupt, bulk transfer (using non blocking asynchronous IO) in Android?
android linux android-ndk signals ioctl asked Nov 23 '18 at 14:27
sunder kandasamysunder kandasamy
707
I assume this is related to your other question (stackoverflow.com/q/53481948/632035)? Answering here pointing at the other is probably fine, since theEINVALdoes explain why this isn't working.
– Dan Albert
Nov 28 '18 at 17:15
But why EINVAL (Invalid Argument)? does that mean its not supported. I need an official info which i am not getting. If i can't use any signal to know URB completion then what's the alternative. Please help
– sunder kandasamy
Nov 29 '18 at 4:25
Well, my first assumption was that it's because bionic reserves a small range of real time signals. This is accounted for bySIGRTMIN, but if you're using an old NDK it's possible that it doesn't do that. Taking another look at this though I don't think it's related since I don't thinkioctlknows anything about that, so never mind.
– Dan Albert
Nov 30 '18 at 0:42
add a comment |
3
3
3
3
I am attempting to Submit ISOCHRONOUS URB in Android NDK in C.
usbdevfs_urb& urbRequest = *(usbdevfs_urb*)malloc( 384 );
urbRequest.type = USBDEVFS_URB_TYPE_ISO;
urbRequest.endpoint = mpEndpoint->GetEndpointAddress();//mpEndpoint->GetEndpointIndex();
urbRequest.status = 0;
urbRequest.flags = USBDEVFS_URB_ISO_ASAP;
urbRequest.buffer = pData;
urbRequest.buffer_length = 0;
urbRequest.actual_length = 0;
urbRequest.start_frame = 0;
urbRequest.number_of_packets = 1;
urbRequest.error_count = 0;
urbRequest.signr = SIGRTMIN;
urbRequest.usercontext = pData;
usbdevfs_iso_packet_desc* pIsoPacketDesc = &urbRequest.iso_frame_desc[0];
pIsoPacketDesc->length = 384;
pIsoPacketDesc->actual_length = 0;
pIsoPacketDesc->status = 0;
ioctl( fd, USBDEVFS_SUBMITURB, &usbRequest);
In the above code, I want to set SIGRTMIN signal for urbRequest.signr.
So that i can get the SIGRTMIN signal on URB completion and i can call REAP URB after
But in Android i am not getting the SIGRTMIN signal at all. Instead my app gets killed without any exception
is there any way i can use SIGRTMIN signal for submitting URB in Android?
Note: I tried using SIGUSR1 and SIGUSR2 signals but ART is catching those signals
is there anyway to do isochronous, interrupt, bulk transfer (using non blocking asynchronous IO) in Android?
android linux android-ndk signals ioctl asked Nov 23 '18 at 14:27
sunder kandasamysunder kandasamy
707
I am attempting to Submit ISOCHRONOUS URB in Android NDK in C.
usbdevfs_urb& urbRequest = *(usbdevfs_urb*)malloc( 384 );
urbRequest.type = USBDEVFS_URB_TYPE_ISO;
urbRequest.endpoint = mpEndpoint->GetEndpointAddress();//mpEndpoint->GetEndpointIndex();
urbRequest.status = 0;
urbRequest.flags = USBDEVFS_URB_ISO_ASAP;
urbRequest.buffer = pData;
urbRequest.buffer_length = 0;
urbRequest.actual_length = 0;
urbRequest.start_frame = 0;
urbRequest.number_of_packets = 1;
urbRequest.error_count = 0;
urbRequest.signr = SIGRTMIN;
urbRequest.usercontext = pData;
usbdevfs_iso_packet_desc* pIsoPacketDesc = &urbRequest.iso_frame_desc[0];
pIsoPacketDesc->length = 384;
pIsoPacketDesc->actual_length = 0;
pIsoPacketDesc->status = 0;
ioctl( fd, USBDEVFS_SUBMITURB, &usbRequest);
In the above code, I want to set SIGRTMIN signal for urbRequest.signr.
So that i can get the SIGRTMIN signal on URB completion and i can call REAP URB after
But in Android i am not getting the SIGRTMIN signal at all. Instead my app gets killed without any exception
is there any way i can use SIGRTMIN signal for submitting URB in Android?
Note: I tried using SIGUSR1 and SIGUSR2 signals but ART is catching those signals
is there anyway to do isochronous, interrupt, bulk transfer (using non blocking asynchronous IO) in Android?
android linux android-ndk signals ioctl android linux android-ndk signals ioctl asked Nov 23 '18 at 14:27
sunder kandasamysunder kandasamy
707
asked Nov 23 '18 at 14:27
sunder kandasamysunder kandasamy
707
asked Nov 23 '18 at 14:27
sunder kandasamysunder kandasamy
707
asked Nov 23 '18 at 14:27
sunder kandasamysunder kandasamy
707
asked Nov 23 '18 at 14:27
sunder kandasamysunder kandasamy
707
707
I assume this is related to your other question (stackoverflow.com/q/53481948/632035)? Answering here pointing at the other is probably fine, since theEINVALdoes explain why this isn't working.
– Dan Albert
Nov 28 '18 at 17:15
But why EINVAL (Invalid Argument)? does that mean its not supported. I need an official info which i am not getting. If i can't use any signal to know URB completion then what's the alternative. Please help
– sunder kandasamy
Nov 29 '18 at 4:25
Well, my first assumption was that it's because bionic reserves a small range of real time signals. This is accounted for bySIGRTMIN, but if you're using an old NDK it's possible that it doesn't do that. Taking another look at this though I don't think it's related since I don't thinkioctlknows anything about that, so never mind.
– Dan Albert
Nov 30 '18 at 0:42
add a comment |
I assume this is related to your other question (stackoverflow.com/q/53481948/632035)? Answering here pointing at the other is probably fine, since theEINVALdoes explain why this isn't working.
– Dan Albert
Nov 28 '18 at 17:15
But why EINVAL (Invalid Argument)? does that mean its not supported. I need an official info which i am not getting. If i can't use any signal to know URB completion then what's the alternative. Please help
– sunder kandasamy
Nov 29 '18 at 4:25
Well, my first assumption was that it's because bionic reserves a small range of real time signals. This is accounted for bySIGRTMIN, but if you're using an old NDK it's possible that it doesn't do that. Taking another look at this though I don't think it's related since I don't thinkioctlknows anything about that, so never mind.
– Dan Albert
Nov 30 '18 at 0:42
I assume this is related to your other question (stackoverflow.com/q/53481948/632035)? Answering here pointing at the other is probably fine, since the
EINVAL does explain why this isn't working.– Dan Albert
Nov 28 '18 at 17:15
I assume this is related to your other question (stackoverflow.com/q/53481948/632035)? Answering here pointing at the other is probably fine, since the
EINVAL does explain why this isn't working.– Dan Albert
Nov 28 '18 at 17:15
But why EINVAL (Invalid Argument)? does that mean its not supported. I need an official info which i am not getting. If i can't use any signal to know URB completion then what's the alternative. Please help
– sunder kandasamy
Nov 29 '18 at 4:25
But why EINVAL (Invalid Argument)? does that mean its not supported. I need an official info which i am not getting. If i can't use any signal to know URB completion then what's the alternative. Please help
– sunder kandasamy
Nov 29 '18 at 4:25
Well, my first assumption was that it's because bionic reserves a small range of real time signals. This is accounted for by
SIGRTMIN, but if you're using an old NDK it's possible that it doesn't do that. Taking another look at this though I don't think it's related since I don't think ioctl knows anything about that, so never mind.– Dan Albert
Nov 30 '18 at 0:42
Well, my first assumption was that it's because bionic reserves a small range of real time signals. This is accounted for by
SIGRTMIN, but if you're using an old NDK it's possible that it doesn't do that. Taking another look at this though I don't think it's related since I don't think ioctl knows anything about that, so never mind.– Dan Albert
Nov 30 '18 at 0:42
add a comment |
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I assume this is related to your other question (stackoverflow.com/q/53481948/632035)? Answering here pointing at the other is probably fine, since the
EINVALdoes explain why this isn't working.– Dan Albert
Nov 28 '18 at 17:15
But why EINVAL (Invalid Argument)? does that mean its not supported. I need an official info which i am not getting. If i can't use any signal to know URB completion then what's the alternative. Please help
– sunder kandasamy
Nov 29 '18 at 4:25
Well, my first assumption was that it's because bionic reserves a small range of real time signals. This is accounted for by
SIGRTMIN, but if you're using an old NDK it's possible that it doesn't do that. Taking another look at this though I don't think it's related since I don't thinkioctlknows anything about that, so never mind.– Dan Albert
Nov 30 '18 at 0:42