SETGROUPS(2)
NAME
setgroups − set group access list
SYNTAX
#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 NGRPS, as defined in <sys/param.h>.
Only the super-user may set new groups.
A 0 value is returned on success, −1 on error, with a error code stored in errno.
DIAGNOSTICS
The setgroups call will fail if:
[EPERM] The caller is not the super-user.
[EFAULT] The address specified for gidset is outside the process address space.