SETGROUPS(2) System Calls Manual SETGROUPS(2)

setgroupsset group access list

#include <sys/param.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 super-user may set new groups.

Use of () is highly discouraged.

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 super-user.
The address specified for gidset is outside the process address space.

getgroups(2), initgroups(3)

The setgroups() function call appeared in 4.2BSD.

September 15, 2010 BSD 4.2