This function will change uid and gid to the ones given while
retaining the capabilities previously specified in capng_update. It
is not necessary and perhaps better if capng_apply has not been
called prior to this function so that all necessary privileges are
still intact. The caller is required to have CAP_SETPCAP capability
still active before calling this function.
This function also takes a flag parameter that helps to tailor the
exact actions performed by the function to secure the environment.
The option may be or'ed together. The legal values are:
Simply change uid and retain specified capabilities and
After changing id, remove any supplement groups that
may still be in effect from the old uid.
After changing id, initialize any supplement groups
that may come with the new account. If given with
CAPNG_DROP_SUPP_GRP it will have no effect.
After changing the uid and gid, clear the bounding set
regardless to the internal representation already
This returns 0 on success and a negative number on failure. -1 means
capng has not been initted properly, -2 means a failure requesting to
keep capabilities across the uid change, -3 means that applying the
intermediate capabilities failed, -4 means changing gid failed, -5
means dropping supplemental groups failed, -6 means changing the uid
failed, -7 means dropping the ability to retain caps across a uid
change failed, -8 means clearing the bounding set failed, -9 means
dropping CAP_SETPCAP failed, -10 means initializing supplemental
Note: the only safe action to do upon failure of this function is to
probably exit. This is because you are likely in a situation with
partial permissions and not what you intended.
This page is part of the libcap-ng (capabilities commands and library
(NG)) project. Information about the project can be found at
⟨https://people.redhat.com/sgrubb/libcap-ng/⟩. It is not known how to
report bugs for this man page; if you know, please send a mail to
firstname.lastname@example.org. This page was obtained from the tarball libcap-
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2020-08-13. If you discover any rendering problems in this HTML ver‐
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source for the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original man‐
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Red Hat Feb 2013 CAPNG_CHANGE_ID(3)