INITGROUPS(3) Linux Programmer's Manual INITGROUPS(3)
NAME
initgroups - initialize the supplementary group access list
SYNOPSIS
#include <grp.h>
#include <sys/types.h>
int initgroups(const char *user, gid_t group);
DESCRIPTION
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.
RETURN VALUE
The initgroups() function returns 0 on success, or -1 if an error occurs.
ERRORS
EPERM The calling process does not have sufficient privileges.
ENOMEM Insufficient memory to allocate group information structure.
FILES
/etc/group group database file
CONFORMING TO
SVID 3, BSD 4.3
NOTES
The prototype for initgroups is only available if _BSD_SOURCE is defined (either explicitly, or implicitly, by not defining _POSIX_SOURCE
or compiling with the -ansi flag).
SEE ALSO
getgroups(2), setgroups(2)
GNU
1993-04-05 INITGROUPS(3)