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Supported on Linux since 6.5.
I see
socket_peercred
is only provided on Linux, while OpenBSD (https://man.openbsd.org/getsockopt.2) has some version ofSO_PEERCRED
, and FreeBSD (https://man.freebsd.org/cgi/man.cgi?unix(4)) has aLOCAL_PEERCRED
(libwayland for instance has code to use those on their respective platforms). These APIs do seem to be slightly different though. In any case,SO_PEERPIDFD
is definitely Linux-specific for the time being.