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Re: [Libusb-devel] usb_find_devices() appears to do nothing
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From: Stuart T. <st...@cs...> - 2003-03-04 23:57:17
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On Tuesday 04 March 2003 01:23 pm, you wrote:
> Can you give me the output from this command:
>
> ls -lR /proc/bus/usb
>
$ ls -lR /proc/bus/usb
/proc/bus/usb:
total 0
dr-xr-xr-x 1 root root 0 Mar 4 04:23 001
dr-xr-xr-x 1 root root 0 Mar 4 04:23 002
-r--r--r-- 1 root root 0 Mar 4 17:51 devices
-r--r--r-- 1 root root 0 Mar 4 17:51 drivers
/proc/bus/usb/001:
total 0
-rw-r--r-- 1 root root 18 Mar 4 10:23 001
/proc/bus/usb/002:
total 0
-rw-r--r-- 1 root root 18 Mar 4 10:23 001
-rw-r--r-- 1 root root 18 Mar 4 17:51 005
The 005, I believe, refers to my mp3 player device
> Also, what version of libusb are you using?
0.1.7
Thanks,
Stuart
>
> JE
>
> On Tue, Mar 04, 2003, Stuart Tett <st...@cs...> wrote:
> > I have been using my Intel Pocket Concert MP3 player with Linux without
> > problem for some time now. For some reason (maybe due to upgrading the
> > kernel), it no longer works. When using any of the programs such as
> > ./probe it prints "No error." Below is a conversation between myself and
> > the developer of libipc helping me to troubleshoot this. I ran strace on
> > ./probe as well as turned on debugging in the source code. He said it had
> > to do with usb_find_devices(), but that usb_find_busses() is working.
> >
> > I'd really appreciate your help.
> > Thanks :)
> >
> > ---------- Forwarded Message ----------
> >
> > Subject: Re: [IPC] libipc sample programs just print "No error"
> > Date: Monday 24 February 2003 12:29 am
> > From: "Seagull" <se...@ar...>
> > To: st...@cs...
> >
> > > I turned on the debugging:
> > >
> > > $ ./probe
> > > usb_set_debug: Setting debugging level to 3 (on)
> > > usb_os_init: Found USB VFS at /proc/bus/usb
> > > usb_os_find_busses: Skipping non bus directory devices
> > > usb_os_find_busses: Skipping non bus directory drivers
> > > usb_os_find_busses: Found 002
> > > usb_os_find_busses: Found 001
> >
> > You might want to drop this by the libusb folks. usb_find_busses() is
> > finding the USB busses, but usb_find_devices() appears to do nothing.
> >
> >
> > Cheers,
> > John
> >
> > > No error
> > >
> > > $ strace ./probe
> > > execve("./probe", ["./probe"], [/* 50 vars */]) = 0
> > > uname({sys="Linux", node="my ip address was here", ...}) = 0
> > > brk(0) = 0x804b700
> > > mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> > > 0) = 0x459eb000
> > > open("/etc/ld.so.preload", O_RDONLY) = 3
> > > fstat64(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
> > > close(3) = 0
> > > open("/etc/ld.so.cache", O_RDONLY) = 3
> > > fstat64(3, {st_mode=S_IFREG|0644, st_size=68349, ...}) = 0
> > > mmap2(NULL, 68349, PROT_READ, MAP_PRIVATE, 3, 0) = 0x459ec000
> > > close(3) = 0
> > > open("/usr/lib/libusb-0.1.so.4", O_RDONLY) = 3
> > > read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\340\21"...,
> > > 1024) = 1024
> > > fstat64(3, {st_mode=S_IFREG|0755, st_size=30969, ...}) = 0
> > > mmap2(NULL, 26100, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x459fd000
> > > mprotect(0x45a02000, 5620, PROT_NONE) = 0
> > > mmap2(0x45a02000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3,
> > > 0x5) = 0x45a02000
> > > close(3) = 0
> > > open("/lib/libc.so.6", O_RDONLY) = 3
> > > read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\0[\1\000"...,
> > > 1024) = 1024
> > > fstat64(3, {st_mode=S_IFREG|0755, st_size=1449677, ...}) = 0
> > > mmap2(NULL, 1235172, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) =
> > > 0x45a04000 mprotect(0x45b2a000, 30948, PROT_NONE) = 0
> > > mmap2(0x45b2a000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED,
> > > 3, 0x125)
> > > = 0x45b2a000
> > > mmap2(0x45b2e000, 14564, PROT_READ|PROT_WRITE,
> > > MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x45b2e000
> > > close(3) = 0
> > > munmap(0x459ec000, 68349) = 0
> > > write(2, "usb_set_debug: Setting debugging"..., 49usb_set_debug:
> > > Setting debugging level to 3 (on)
> > > ) = 49
> > > open("/proc/bus/usb", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
> > > fstat64(3, {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
> > > fcntl64(3, F_SETFD, FD_CLOEXEC) = 0
> > > brk(0) = 0x804b700
> > > brk(0x804d700) = 0x804d700
> > > brk(0x804e000) = 0x804e000
> > > getdents64(0x3, 0x804b738, 0x1000, 0) = 160
> > > close(3) = 0
> > > write(2, "usb_os_init: Found USB VFS at /p"..., 44usb_os_init: Found
> > > USB VFS at
> > > /proc/bus/usb
> > > ) = 44
> > > open("/proc/bus/usb", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
> > > fstat64(3, {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
> > > fcntl64(3, F_SETFD, FD_CLOEXEC) = 0
> > > getdents64(0x3, 0x804b738, 0x1000, 0) = 160
> > > write(2, "usb_os_find_busses: Skipping non"..., 55usb_os_find_busses:
> > > Skipping non bus directory devices
> > > ) = 55
> > > write(2, "usb_os_find_busses: Skipping non"..., 55usb_os_find_busses:
> > > Skipping non bus directory drivers
> > > ) = 55
> > > write(2, "usb_os_find_busses: Found 002\n", 30usb_os_find_busses: Found
> > > 002 ) = 30
> > > brk(0x804f000) = 0x804f000
> > > write(2, "usb_os_find_busses: Found 001\n", 30usb_os_find_busses: Found
> > > 001 ) = 30
> > > getdents64(0x3, 0x804b738, 0x1000, 0) = 0
> > > close(3) = 0
> > > write(2, "No error\n", 9No error
> > > ) = 9
> > > _exit(1) = ?
> > >
> > > On Saturday 22 February 2003 05:18 pm, you wrote:
> > > > Hmm...
> > > >
> > > > IPC_Discover() calls usb_init() inside of libusb. This, in turn,
> > > > stats the
> > > >
> > > > /proc/bus/usb directory, which is this segment here:
> > > > > open("/proc/bus/usb", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY)
> > > > > = 3 fstat64(3, {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
> > > > > fcntl64(3, F_SETFD, FD_CLOEXEC) = 0
> > > > > brk(0) = 0x804b700
> > > > > brk(0x804d700) = 0x804d700
> > > > > brk(0x804e000) = 0x804e000
> > > > > getdents64(0x3, 0x804b738, 0x1000, 0) = 160
> > > > > close(3) = 0
> > > >
> > > > Then, IPC_Discover() calls usb_find_busses() in libusb, which in turn
> > > >
> > > > calls usb_os_find_busses(), which is right here:
> > > > > open("/proc/bus/usb", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY)
> > > > > = 3 fstat64(3, {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
> > > > > fcntl64(3, F_SETFD, FD_CLOEXEC) = 0
> > > > > getdents64(0x3, 0x804b738, 0x1000, 0) = 160
> > > > > brk(0x804f000) = 0x804f000
> > > > > getdents64(0x3, 0x804b738, 0x1000, 0) = 0
> > > > > close(3) = 0
> > > >
> > > > What's odd is that usb_find_devices(), which comes next in
> > > > IPC_Discover(), doesn't seem to take any action. It's almost as if
> > > > libusb is not registering having found any USB busses at all.
> > > >
> > > > Add this line to probe.c, just before IPC_Discover() is called:
> > > >
> > > > usb_set_debug(3);
> > > >
> > > > Then recompile and rerun. THis should generate some debug output
> > > > from libusb.
> > > >
> > > >
> > > > Cheers,
> > > > John
> > >
> > > --
> > >
> > > st...@ia...
> >
> > --
> > \ carpe cavy!
> > seagull @ aracnet.com \
> > http://www.aracnet.com/~seagull/ \ (seize the guinea pig!)
> >
> > -------------------------------------------------------
> >
> >
> >
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--
Stuart Tett
st...@ia...
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