Various Topics on Scanners

..ger.. ..ail.c..

It looks as if, one recieves the following "invalid pointer error", the
Epson 2490 may need to be first initialized by the iscan linux software
(if they're using a linux based o/s) before vuescan will successfully
start. Starting iscan seems to initialize the scanner to some sort of
"ON" state. From there, vuescan starts w/o further problems.

(*Note: On linux based o/s's, the epson 2490 uses drivers provided by
iscan and not sane/xsane. I believe they're closed sourced and also
provides firmware to be loaded at plugin. Reading strace output shows
it looks as if vuescan is having problems initializing the scanner as
needed.)

$ ./vuescan
*** glibc detected *** free(): invalid pointer
$


$ strace vuescan
- - - snip - - -
open("/etc/ld.so.cache", O_RDONLY) = 6
fstat64(6, {st_mode=S_IFREG|0644, st_size=162762, ...}) = 0
mmap2(NULL, 162762, PROT_READ, MAP_PRIVATE, 6, 0) = 0xb202b000
close(6) = 0
open("/usr/lib/gcc/i686-pc-linux-gnu/3.4.5/libstdc++.so.6", O_RDONLY) =
6
read(6, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\2 00\373"...,
512) = 512
fstat64(6, {st_mode=S_IFREG|0755, st_size=845268, ...}) = 0
mmap2(0x41de2000, 860756, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_DENYWRITE, 6, 0) = 0x41de2000
madvise(0x41de2000, 860756, MADV_SEQUENTIAL|0x1) = 0
mmap2(0x41eaa000, 20480, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 6, 0xc8) = 0x41eaa000
mmap2(0x41eaf000, 21076, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x41eaf000
close(6) = 0
futex(0x41eabde4, FUTEX_WAKE, 2147483647) = 0
munmap(0xb202b000, 162762) = 0
mmap2(NULL, 2101248, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0xb1e52000
gettimeofday({1148854803, 343093}, NULL) = 0
ioctl(5, USBDEVFS_SUBMITURB, 0xbfb5a080) = 0
ioctl(5, USBDEVFS_REAPURBNDELAY, 0xbfb59fe4) = -1 EAGAIN (Resource
temporarily unavailable)
select(6, NULL, [5], NULL, {0, 1000}) = 1 (out [5], left {0, 1000})
gettimeofday({1148854803, 344814}, NULL) = 0
ioctl(5, USBDEVFS_REAPURBNDELAY, 0xbfb59fe4) = 0
gettimeofday({1148854803, 345606}, NULL) = 0
ioctl(5, USBDEVFS_SUBMITURB, 0xbfb5a080) = 0
ioctl(5, USBDEVFS_REAPURBNDELAY, 0xbfb59fe4) = 0
open("/dev/tty", O_RDWR|O_NONBLOCK|O_NOCTTY) = 6
writev(6, [{"*** glibc detected *** ", 23}, {"free(): invalid pointer",
23}, {": 0x", 4}, {"089adc10", 8}, {" ***\n", 5}], 5*** glibc detected
*** free(): invalid pointer: 0x089adc10 ***
) = 63
rt_sigprocmask(SIG_UNBLOCK, [ABRT], NULL, 8) = 0
tgkill(22220, 22220, SIGABRT) = 0
--- SIGABRT (Aborted) @ 0 (0) ---
+++ killed by SIGABRT +++