<errno.h>
errno.h is a header file in the standard library of C programming language. It defines macros to report error conditions through error codes.
The errno macro expands to an lvalue with type int, containing the last error code generated in any function using the errno facility.
Three macros expand to integer constants which represent the error codes:
• EDOM results from a parameter outside a function's domain, for example sqrt(-1)
• ERANGE results from a result outside a function's range, for example strtol("0xfffffffff",NULL,0)
• EILSEQ results from an illegal character sequence, for example wcstombs(str, L"\xffff", 2)
POSIX compliant operating systems like UNIX or Linux may include other macros to represent other operating system error code numbers.
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