Did you know that --usb=ALL and --i2c=ALL:ALL will do the scanning for you?
I think the serial hasn't actually hung, it's just a very long sequence
(minutes). The code certainly wasn't tuned for efficiently finding bad port,
but rather finding the right settings for configuration problems. So there
is a long timeout for each attempt (5 seconds) and we try many times with
both harware flow control and not.
We could have a "quick test" option, or even better, a little utility that
just tests whether a serial bus master is available. (just tries and returns
the answer, could even try the ports in parallel).
Paul Alfille
On Mon, Aug 15, 2011 at 9:13 AM, Jan Kandziora <j...@gmx.de> wrote:
> Hello,
>
> in my application, I have an auto-detection scheme to find out which host
> adapter(s) the machine has. Basically I probe each /dev/i2c-*, /dev/ttyS*,
> /dev/ttyUSB* and usb one after another to find out if there is a onewire
> host
> on that port.
>
> That works fine with USB and I²C, but with serial ports, owfs hangs. No
> timeout. Tested with latest cvs.
>
> ------tcl source------
> package require ow
> ow open /dev/ttyS0
> ...hanging...
>
> strace shows me something is going on during this "hanging", but I don't
> find
> the place in the source where that endless loop happens.
>
> -------strace-------
> open("/dev/ttyS0", O_RDWR|O_NOCTTY|O_NONBLOCK|O_LARGEFILE) = 3
> ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon -echo
> ...}) = 0
> ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon -echo
> ...}) = 0
> ioctl(3, SNDCTL_TMR_CONTINUE or TCSETSF, {B9600 -opost -isig -icanon -echo
> ...}) = 0
> ioctl(3, TCFLSH, 0x2) = 0
> ioctl(3, TCSBRK, 0) = 0
> select(4, NULL, [3], NULL, {5, 0}) = 1 (out [3], left {4, 999986})
> write(3, "\301", 1) = 1
> ioctl(3, TCSBRK, 0x1) = 0
> nanosleep({0, 4000000}, 0xbfa6b2d0) = 0
> ioctl(3, TCFLSH, 0x2) = 0
> select(4, [3], NULL, NULL, {0, 1000}) = 0 (Timeout)
> ioctl(3, TCFLSH, 0x2) = 0
> nanosleep({0, 5000000}, 0xbfa6b220) = 0
> select(4, NULL, [3], NULL, {5, 0}) = 1 (out [3], left {4, 999992})
> write(3, "q", 1) = 1
> ioctl(3, TCSBRK, 0x1) = 0
> nanosleep({0, 5000000}, 0xbfa6b220) = 0
> ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon -echo
> ...}) = 0
> ioctl(3, SNDCTL_TMR_CONTINUE or TCSETSF, {B9600 -opost -isig -icanon -echo
> ...}) = 0
> ioctl(3, TCFLSH, 0x2) = 0
> nanosleep({0, 5000000}, 0xbfa6b220) = 0
> select(4, [3], NULL, NULL, {0, 1000}) = 0 (Timeout)
> select(4, NULL, [3], NULL, {5, 0}) = 1 (out [3], left {4, 999992})
> write(3, "\17", 1) = 1
> ioctl(3, TCSBRK, 0x1) = 0
> select(4, [3], NULL, NULL, {5, 0}) = 0 (Timeout)
> ioctl(3, TCSBRK, 0x1) = 0
> ioctl(3, TCFLSH, 0x2) = 0
> nanosleep({0, 5000000}, 0xbfa6b220) = 0
> select(4, NULL, [3], NULL, {5, 0}) = 1 (out [3], left {4, 999991})
> write(3, "q", 1) = 1
> ioctl(3, TCSBRK, 0x1) = 0
> nanosleep({0, 5000000}, 0xbfa6b220) = 0
> ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon -echo
> ...}) = 0
> ioctl(3, SNDCTL_TMR_CONTINUE or TCSETSF, {B9600 -opost -isig -icanon -echo
> ...}) = 0
> ioctl(3, TCFLSH, 0x2) = 0
> nanosleep({0, 5000000}, 0xbfa6b220) = 0
> select(4, [3], NULL, NULL, {0, 1000}) = 0 (Timeout)
> select(4, NULL, [3], NULL, {5, 0}) = 1 (out [3], left {4, 999992})
> write(3, "\17", 1) = 1
> ioctl(3, TCSBRK, 0x1) = 0
> select(4, [3], NULL, NULL, {5, 0}) = 0 (Timeout)
> ioctl(3, TCSBRK, 0x1) = 0
> ioctl(3, TCFLSH, 0x2) = 0
> select(4, NULL, [3], NULL, {5, 0}) = 1 (out [3], left {4, 999991})
> write(3, "\305", 1) = 1
> ioctl(3, TCSBRK, 0x1) = 0
> select(4, [3], NULL, NULL, {5, 0} <unfinished ...>
> -------end strace-------
>
> Any pointers?
>
> Kind regards
>
> Jan
>
>
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