GETGROUPLIST(3) BSD Library Functions Manual GETGROUPLIST(3)NAMEgetgrouplist — calculate group access list
Standard C Library (libc, -lc)
getgrouplist(const char *name, gid_t basegid, gid_t *groups,
The getgrouplist() function reads through the group file and calculates
the group access list for the user specified in name. The basegid is
automatically included in the groups list. Typically this value is given
as the group number from the password file.
The resulting group list is returned in the array pointed to by groups.
The caller specifies the size of the groups array in the integer pointed
to by ngroups; the actual number of groups found is returned in ngroups.
The getgrouplist() function returns -1 if the size of the group list is
too small to hold all the user's groups. Here, the group array will be
filled with as many groups as will fit.
/etc/group group membership list
SEE ALSOsetgroups(2), initgroups(3)HISTORY
The getgrouplist() function first appeared in 4.4BSD.
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 June 9, 1993 BSD