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.TH "COMEDI_ERRNO" "3" "02 October 2004" "" ""
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comedi_errno \- number of last Comedilib error
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\fB#include <comedilib.h>
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int comedi_errno (void \fI\fB);
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When a Comedilib function fails, it usually returns -1 or
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NULL, depending on the return type. An internal library
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variable stores an error number, which can be retrieved with
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comedi_errno(). This error number can be converted to a
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human-readable form by the functions comedi_perror()
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and comedi_strerror().
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These functions are intended to mimic the behavior of the
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standard C library functions perror(), strerror(), and errno.
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In particular, Comedilib functions sometimes return an error
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that is generated inside the C library; the comedi error
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message in this case is the same as the C library.
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The function comedi_errno() returns an integer describing
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the most recent comedilib error. This integer may be used
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as the errnum parameter for comedi_strerror().
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Note that comedi_errno() is deliberately different than the
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variable errno. This is to overcome difficulties in making
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doc/man/comedi_errno.3
