NAME
comedi_perror - print a Comedilib error message
SYNOPSIS
#include <comedilib.h>
void comedi_perror (const char * s);
DESCRIPTION
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 with 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_perror() prints an error message to stderr. The
error message consists of the argument string, a colon, a space, a
description of the error condition, and a new line.
28 October 2007