SETGROUPS(2)

NAME
setgroups - set group access list

SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
int
setgroups(int ngroups, const gid_t *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_MAX}.

Only the superuser may set new groups.

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

ERRORS
The setgroups() call will fail if:

[EINVAL]
    The value of ngroups is greater than {NGROUPS_MAX}.

[EPERM]
    The caller is not the superuser.

[EFAULT]
    The address specified for gidset is outside the process address space.

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

HISTORY
The setgroups() function call appeared in 4.2BSD.