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SETGROUPS(2) System Calls Manual SETGROUPS(2)

setgroupsset group access list

#include <sys/types.h>
#include <unistd.h>

setgroups(int ngroups, const gid_t *gidset);

() 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_MAX}.

Only the superuser may set new groups.

A 0 value is returned on success, -1 on error, with an error code stored in errno.

The setgroups() call will fail if:

The value of ngroups is greater than {NGROUPS_MAX}.
The caller is not the superuser.
The address specified for gidset is outside the process address space.

getgroups(2), setgid(2), setregid(2), initgroups(3)

The setgroups() function call appeared in 4.2BSD.

May 31, 2007 OpenBSD-5.1