gen/getgrouplist.3

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  32 .\"     @(#)getgrouplist.3      8.1 (Berkeley) 6/9/93
  33 .\" $FreeBSD: src/lib/libc/gen/getgrouplist.3,v 1.7 2001/10/01 16:08:51 ru Exp $
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  35 .Dd June 9, 1993
  36 .Dt GETGROUPLIST 3
  37 .Os
  38 .Sh NAME
  39 .Nm getgrouplist
  40 .Nd calculate group access list
  41 .Sh LIBRARY
  42 .Lb libc
  43 .Sh SYNOPSIS
  44 .In unistd.h
  45 .Ft int
  46 .Fn getgrouplist "const char *name" "int basegid" "int *groups" "int *ngroups"
  47 .Sh DESCRIPTION
  48 The
  49 .Fn getgrouplist
  50 function reads through the group file and calculates
  51 the group access list for the user specified in
  52 .Fa name .
  53 The
  54 .Fa basegid
  55 is automatically included in the groups list.
  56 Typically this value is given as
  57 the group number from the password file.
  58 .Pp
  59 The resulting group list is returned in the integer array pointed to by
  60 .Fa groups .
  61 The caller specifies the size of the
  62 .Fa groups
  63 array in the integer pointed to by
  64 .Fa ngroups ;
  65 the actual number of groups found is returned in
  66 .Fa ngroups .
  67 .Sh RETURN VALUES
  68 The
  69 .Fn getgrouplist
  70 function
  71 returns \-1 if the size of the group list is too small to
  72 hold all the user's groups.
  73 Here, the group array will be filled with as many groups as will fit.
  74 .Sh FILES
  75 .Bl -tag -width /etc/group -compact
  76 .It Pa /etc/group
  77 group membership list
  78 .El
  79 .Sh SEE ALSO
  80 .Xr setgroups 2 ,
  81 .Xr initgroups 3
  82 .Sh HISTORY
  83 The
  84 .Fn getgrouplist
  85 function first appeared in
  86 .Bx 4.4 .
  87 .Sh BUGS
  88 The
  89 .Fn getgrouplist
  90 function
  91 uses the routines based on
  92 .Xr getgrent 3 .
  93 If the invoking program uses any of these routines,
  94 the group structure will
  95 be overwritten in the call to
  96 .Fn getgrouplist .