Open System Services Library Calls Reference Manual (G06.27+, H06.04+)

OSS Library Calls (w - z) wctomb(3)
ERRORS
If any of the following conditions occur, the wctomb() function sets errno to the corresponding
value:
[EILSEQ] The wchar parameter does not correspond to a valid multibyte character.
RELATED INFORMATION
Functions: mblen(3), mbstowcs(3), mbtowc(3), wcstombs(3).
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