SETGROUPS(2)
NAME
setgroups − set group access list
USAGE
#include <sys/param.h>
setgroups(ngroups, gidset)
int ngroups, *gidset;
DESCRIPTION
Setgroups sets the group access list of the current user process according to the array gidset. The parameter ngroups indicates the number of entries in the array and must be no more than NGROUPS, as defined in <sys/param.h>.
Only the super-user can set new groups.
RETURN VALUE
A zero value is returned on success, −1 on error, with an error code stored in errno.
ERRORS
The setgroups call fails if:
[EPERM] The caller is not the super-user.
[EFAULT] The address specified for gidset is outside the process address space.