09-21-2009
do you mean persons in my same group, right ?
Or all groups in which I am ?
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LEARN ABOUT NETBSD
getgrouplist
GETGROUPLIST(3) BSD Library Functions Manual GETGROUPLIST(3)
NAME
getgrouplist, getgroupmembership, -- calculate group access list
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
getgrouplist(const char *name, gid_t basegid, gid_t *groups, int *ngroups);
int
getgroupmembership(const char *name, gid_t basegid, gid_t *groups, int maxgrp, int *ngroups);
DESCRIPTION
The getgrouplist() and getgroupmembership() functions read through the group database and calculate the group access list for the user speci-
fied in name. The basegid is automatically included in the groups list. Typically this value is given as the group number from the password
database.
The resulting group list is returned in the integer array pointed to by groups.
For getgrouplist(), the caller specifies the size of the groups array in the integer pointed to by ngroups.
For getgroupmembership(), the caller specifies the size of the groups array in maxgrp.
The actual number of groups found is returned in ngroups.
Duplicate group ids will be suppressed from the result.
RETURN VALUES
The getgrouplist() and getgroupmembership() functions return 0 if successful, and return -1 if the size of the group list is too small to
hold all the user's groups. In the latter case, the groups array will be filled with as many groups as will fit and ngroups will contain the
total number of groups found.
FILES
/etc/group group membership list
SEE ALSO
setgroups(2), initgroups(3), group(5)
HISTORY
The getgrouplist() function first appeared in 4.4BSD. The getgroupmembership() function first appeared in NetBSD 3.0 to address an API defi-
ciency in getgrouplist().
BUGS
The getgrouplist() function uses the routines based on getgrent(3). If the invoking program uses any of these routines, the group structure
will be overwritten in the call to getgrouplist().
BSD
January 6, 2005 BSD