Show z/OS UNIX reason code

To show the z/OS® UNIX reason code, add the following variable setting to rsed.envvars:

_EDC_ADD_ERRNO2=1 

For more information, see the XL C/C++ Programming Guide (SC09-4765), section about _EDC_ADD_ERRNO2. (Location: http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/CBCPG190/4.12.2.7?SHELF=CBCBS190&DT=20080616063107 for z/OS 1.10)

When _EDC_ADD_ERRNO2 is set to 1, errno2 is added to perror(), strerror(), and strerror_r() messages. Example:

+FEK117E socketpair() failed. 
   reason=(EDC5124I Too many open files. (errno2=0x050B0146))