MAN page from OpenSuSE libcap-ng-devel-0.7.3-26.12.i586.rpm
Section: Libcap-ng API (3)
Updated: June 2009Index
capng_change_id - change the credentials retaining capabilities
int capng_change_id(int uid, int gid, capng_flags_t flag);
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 that's all.
- After changing id, remove and supplement groups that may come with the account.
- After changing the uid and gid, clear the bounding set regardless to the internal representation already setup.
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.
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.
- RETURN VALUE
- SEE ALSO
This document was created byman2html,using the manual pages.