comedi_errno — number of last Comedilib error
#include <comedilib.h>
int comedi_errno( | void); |
When a Comedilib function fails, it usually returns -1 or
NULL, depending on the return type. An internal library
variable stores an error number, which can be retrieved by calling
comedi_errno This error number can be converted to a
human-readable form by the functions
comedi_perror
and
comedi_strerror.
These functions are intended to mimic the behavior of the
standard C library functions perror,
strerror, and errno.
In particular, Comedilib functions sometimes return an error
that is generated inside the C library; the comedi error
message in this case is the same as the C library.
The function comedi_errno returns an integer describing
the most recent Comedilib error. This integer may be used
as the errnum parameter for
comedi_strerror.