Hi Christian,
On 7/6/2026 10:08 AM, Christian Franke via Cygwin wrote:
Currently madvise() appears only as an alias in cygwin.din:
madvise = posix_madvise SIGFE
But according to the man pages, the error handling should differ:
https://man7.org/linux/man-pages/man2/madvise.2.html:
"On error, it returns -1 and errno is set to indicate the error."
https://man7.org/linux/man-pages/man3/posix_madvise.3.html
"On failure, it returns a positive error number."
https://pubs.opengroup.org/onlinepubs/009695399/functions/
posix_madvise.html
https://pubs.opengroup.org/onlinepubs/9799919799/functions/
posix_madvise.html
"... otherwise, an error number shall be returned to indicate the error."
The POSIX variant implies that 'errno' is left unchanged.
On Cygwin, only posix_madvise() works as documented.
On Linux, both functions work as documented.
Thanks for the report and diagnosis. I'll submit a patch shortly.
..mark
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