derror, derrmsg - describe last I/O error
#include
derror()
char *derrmsg()
Each RMS routine saves an error number and error message when it
encounters an error. Derror returns the saved error number from
the last RMS error that occurred, and clears the saved error
number. Derrmsg returns a pointer to a string that contains the
saved error message describing the last RMS error that occurred,
and clears the saved error message.
Normally, you should call derror or derrmsg only after an RMS
routine fails (e.g. returns BAD or NULL, as appropriate).
The error messages and numbers are symbolically defined in the
include file
Chapter 4, RMS Programming Guide
Derror returns a zero if there have been no RMS errors since the
last call to derror, or if there have been no RMS errors and
derror has not been previously called.
Derrmsg returns NULL if there have been no RMS errors since the
last call to derrmsg, or if there have been no RMS errors and
derrmsg has not been previously called.