The "interface error" is a problem for me, so for years I have wrapped 2!:0 as:
host =: [: 2!:0 '(' , ' || true)' ,~ ]
You can probably tinker that to return the error too, but having the
stderror output doesn't usually cause me a problem, and can be
helpful in casual use.
Your problem with 2!:0 is a bug, likely somewhere in 64 bit support -
e.g. Maybe you should try an update to j602a.
(2!:2) 'ls -x'
31228 _1605202516 _1605202428
1!:20 ''
+-----------+------+
|_1605202516|<ls -x|
+-----------+------+
|_1605202428|>ls -x|
+-----------+------+
version ''
Installer: j602a_mac_powerpc.dmg
Engine: j602/2008-03-03/16:45
Library: 6.02.023ProductName: Mac OS X
ProductVersion: 10.5.4
(2!:2) 'ls -x'
16956 161758064 161758424
1!:20 ''
+---------+------+
|161758064|<ls -x|
+---------+------+
|161758424|>ls -x|
+---------+------+
version ''
sh: sw_vers: command not found
Installer: j602a_linux32.sh
Engine: j602/2008-03-03/16:45
At 22:54 -0500 2008/07/20, Jorge Arredondo wrote:
I'm using (2!:0) on Linux to execute a process, if it exits with code
0, I can obtain its output and continue, otherwise an interface error
exception is signaled. Is it possible to execute a process from J on
Linux and get its status code? I tried using (2!:2) but it doesn't
work as it abnormally ends J.
I'm using OpenSuse Linux 10.2 x64 kernel 2.6.18.8-0.9-default (no
mods) and J 6.01
Example:
(2!:0) 'ls -x'
addons breaker.ijs install.txt jbreak jconsole jee
jep jicon.gif j.jar jw libj601.so libjnative.so
libjpcre.so profile.ijs system temp user version_bin.txt
(2!:0) 'ls -'
ls: cannot access -: No such file or directory
|interface error
| (2!:0)'ls -'
(2!:2) 'ls -x'
*** glibc detected *** ./jconsole: double free or corruption (!prev):
0x00000000008daf90 ***
======= Backtrace: =========
/lib64/libc.so.6[0x2b9b98c268fe]
/lib64/libc.so.6(cfree+0x76)[0x2b9b98c27f36]
/lib64/libc.so.6(fclose+0x155)[0x2b9b98c17a65]
...
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