initgroups - initialize the supplementary group access list
#include <grp.h>
#include <sys/types.h>
int initgroups(const char *user, gid_t group);
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.
The initgroups() function returns 0 on success, or -1 if an error
occurs.
EPERM The calling process does not have sufficient privileges.
ENOMEM Insufficient memory to allocate group information structure.
/etc/group group database file
SVID 3, BSD 4.3
getgroups(2), setgroups(2)
GNU 1993-04-05 INITGROUPS(3)
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