free size of disk group

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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

Solaris