Here is the relevant part of the strace:
write(1, "(check-version", 14) = 14
write(1, "\10\10\10\10\10\10\10\10\10\10\10\10\10\10(check-version)",
29) = 29
select(1, [0], [], NULL, NULL) = 1 (in [0])
fcntl(0, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE)
fcntl(0, F_SETFL, O_RDWR|O_NONBLOCK|O_LARGEFILE) = 0
read(0, "\r", 8192) = 1
fcntl(0, F_SETFL, O_RDWR|O_LARGEFILE) = 0
write(1,
"\10\10\10\10\10\10\10\10\10\10\10\10\10\10\10(check-version)\10", 31) = 31
write(1, "\n", 1) = 1
open("/dev/ttyACM0", O_RDWR|O_CREAT, 0666) = 3
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
{B9600 -opost -isig -icanon -echo ...}) = 0
write(3, "ver\n", 4) = 4
read(3, "ver\n", 8192) = 4
read(3, 0x9f0148, 8192) = ? ERESTARTSYS (To be restarted
if SA_RESTART is set)
--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
rt_sigreturn() = -1 EINTR (Interrupted system call)
The lines...
write(3, "ver\n", 4) = 4
read(3, "ver\n", 8192) = 4
..are where I have prinl'd "ver" to the dev file and got it echoed back.
I do not know what...
read(3, 0x9f0148, 8192) = ? ERESTARTSYS (To be restarted
if SA_RESTART is set)
..means, but it must be significant.
The SIGINT is from me pressing Ctrl-C after the program seems to have hung.
On 04/23/2017 05:39 AM, Alexander Burger wrote:
> On Sat, Apr 22, 2017 at 04:46:35PM -0800, Christopher Howard wrote:
>> (in Dev
>> (line) # ADDED LINE
>> (setq Output (line)) )
>> (close Dev) )
>> Output )
>>
>> ..a call to (check-version) will hang, as though waiting for more
>> output, instead of giving me the second line (the result data).
>
> Yes, strange that the second call to (line) hangs. Perhaps you could 'strace'
> the picolisp process to see what exactly is received?
>
> ♪♫ Alex
>
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