initgroups(3C)
NAME
initgroups − initialize the supplementary group access list
SYNOPSIS
#include <grp.h>
#include <sys/types.h>
int initgroups(const char ∗name, gid_t basegid);
DESCRIPTION
initgroups() reads the group database to get the group membership for the user specified by name and then initializes the supplementary group access list of the calling process (see getgrnam(3C) and getgroups(2)). The basegid group id is also included in the supplementary group access list. This is typically the real group id from the user database.
While scanning the group database, if the number of groups, including the basegid entry, exceeds {NGROUPS_MAX}, subsequent group entries are ignored.
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value of −1 is returned and errno is set to indicate the error.
ERRORS
initgroups() will fail and not change the supplementary group access list if:
EPERM The effective user id is not superuser.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| MT-Level | Unsafe |
SEE ALSO
getgroups(2), getgrnam(3C), attributes(5)
SunOS 5.6 — Last change: 29 Dec 1996