initgroups - initialize the supplementary group access list
The initgroups() function initializes the group access list by reading the group database
/etc/group and using all groups of which
user is a member. The additional group
group is also added to the list.
user argument must be non-NULL.
The initgroups() function returns 0 on success. On error, -1 is returned, and
errno is set appropriately.
Insufficient memory to allocate group information structure.
The calling process has insufficient privilege. See the underlying system call setgroups(2).
group database file
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