Date: Sun, 28 Jan 2007 12:24:52 +0100 From: usleepless@gmail.com To: "FreeBSD Questions" <freebsd-questions@freebsd.org> Subject: structure alignment problems Message-ID: <c39ec84c0701280324u4819b9ech51627c44cc17dbef@mail.gmail.com>
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Hi,
i am working on getting mythtv-0.20 talking to the pvrxxx driver.
the problem appears when i want to do:
v4l2_capabilities vcap;
ioctl(videofd, VIDIOC_QUERYCAP, &vcap);
the driver and mythtv have the struct differently aligned, and i get
an "inappropiate ioctl for device". this is what the struct + IOR look
like:
struct v4l2_capability
{
__u8 driver[16]; /* i.e. "bttv" */
__u8 card[32]; /* i.e. "Hauppauge WinTV" */
__u8 bus_info[32]; /* "PCI:" + pci_name(pci_dev) */
__u32 version; /* should use KERNEL_VERSION() */
__u32 capabilities; /* Device capabilities */
__u32 reserved[4];
};
#define VIDIOC_QUERYCAP _IOR ('V', 0, struct v4l2_capability)
the driver is compiled like this:
cc -O -pipe -Werror -D_KERNEL -DKLD_MODULE -nostdinc -I- -I../../..
-I. -I@ -I@/contrib/altq -I@/../include -finline-limit=8000
-fno-common -fno-omit-frame-pointer -mcmodel=kernel -mno-red-zone
-mfpmath=387 -mno-sse -mno-sse2 -mno-mmx -mno-3dnow -msoft-float
-fno-asynchronous-unwind-tables -ffreestanding -Wall -Wredundant-decls
-Wnested-externs -Wstrict-prototypes -Wmissing-prototypes
-Wpointer-arith -Winline -Wcast-qual -fformat-extensions -std=c99 -c
/usr/ports/multimedia/pvrxxx/work/modules/cxm/cxm/../../../dev/cxm/cxm.c
it yields a struct-size of 104 bytes.
mythtv is compiled like this:
g++ -c -pipe -I/usr/local/include/artsc -D_REENTRANT
-I/usr/local/include/glib-2.0 -I/usr/local/lib/glib-2.0/include -g
-Wall -W -O2 -pthread -Wall -Wno-switch -fomit-frame-pointer
-I/usr/local/include/freetype2 -I/usr/local/include -DPIC -fPIC
-DUSING_FREEBOX -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
-DPREFIX=\"/usr/local\" -DLIBDIR=\"/usr/local/lib\"
-D_LARGEFILE_SOURCE -DUSING_OSS -DUSING_H264TOOLS -DUSING_XV
-DUSING_FRONTEND -DUSING_CRC_IP_NETWORK_REC -DUSING_V4L -DUSING_DBOX2
-DUSING_FREEBOX -DUSING_HDHOMERUN -DUSING_IVTV -DUSING_BACKEND
-DQT_NO_DEBUG -DQT_THREAD_SUPPORT -DQT_SHARED -DQT_TABLET_SUPPORT
-I/usr/local/share/qt/mkspecs/freebsd-g++ -I.
-I../../../../../../../local/include
-I../../../../../../../X11R6/include -I../.. -I.. -I../libmyth
-I../libavcodec -I../libavutil -I../libmythmpeg2 -Idvbdev -Impeg
-I../libmythlivemedia/BasicUsageEnvironment/include
-I../libmythlivemedia/groupsock/include
-I../libmythlivemedia/liveMedia/include
-I../libmythlivemedia/UsageEnvironment/include
-I../../../../../../../local/include -I/usr/X11R6/include -o
cardutil.o cardutil.cpp
and it yields a struct-size of 128.
is it the -std=c99? is it because this is on amd64?
any help is greatly appreciated!
regards,
usleep
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