[ECOS] problem in using cyg_hal_sys_read

[Dorairaj V]

Hi ,
I'm using the ecos api cyg_hal_sys_read() to read from a named pipe  in
a linux based synthetic target (ecos 1.3.1 on i386 linux RHL 6.2 ) . I
find that cyg_hal_sys_read  fails and returns error number -4 .
Can some one let me know what does the error code mean ? Also where can
I get a comprehensive list of ecos error codes and their meanings .

Thanks in advance for any response

Regards
Dorairaj V