CentOS 7.0 - man page for capng_get_caps_fd (centos section 3)
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CAPNG_GET_CAPS_FD(3) Libcap-ng API CAPNG_GET_CAPS_FD(3)
int capng_get_caps_fd(int fd);
This function will read the file based capabilities stored in extended attributes of the
file that the descriptor was opened against. The bounding set is not included in file
based capabilities operations. Note that this function will only work if compiled on a
kernel that supports file based capabilities such as 2.6.26 and later. If the "magic" bit
is set, then all effect capability bits are set. Otherwise the bits are cleared.
This returns 0 on success and -1 on failure.
Red Hat June 2009 CAPNG_GET_CAPS_FD(3)
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