97 lines
3.1 KiB
Groff
97 lines
3.1 KiB
Groff
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.\" Copyright (c) 1983, 1991 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)getgroups.2 6.7 (Berkeley) 3/10/91
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.\"
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.Dd March 10, 1991
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.Dt GETGROUPS 2
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.Os BSD 4.2
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.Sh NAME
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.Nm getgroups
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.Nd get group access list
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.Sh SYNOPSIS
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.Fd #include <sys/param.h>
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.Fd #include <unistd.h>
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.Ft int
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.Fn getgroups "int gidsetlen" "int *gidset"
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.Sh DESCRIPTION
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.Fn Getgroups
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gets the current group access list of the user process
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and stores it in the array
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.Fa gidset .
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The parameter
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.Fa gidsetlen
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indicates the number of entries that may be placed in
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.Fa gidset .
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.Fn Getgroups
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returns the actual number of groups returned in
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.Fa gidset .
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No more than
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.Dv NGROUPS ,
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as defined in
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.Aq Pa sys/param.h ,
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will ever
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be returned.
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.Sh RETURN VALUES
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A successful call returns the number of groups in the group set.
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A value of -1 indicates that an error occurred, and the error
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code is stored in the global variable
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.Va errno .
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.Sh ERRORS
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The possible errors for
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.Fn getgroups
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are:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The argument
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.Fa gidsetlen
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is smaller than the number of groups in the group set.
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.It Bq Er EFAULT
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The argument
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.Fa gidset
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specifies
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an invalid address.
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.El
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.Sh SEE ALSO
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.Xr setgroups 2 ,
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.Xr initgroups 3
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.Sh BUGS
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The
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.Fa gidset
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array should be of type
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.Vt gid_t ,
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but remains integer for compatibility with earlier systems.
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.Sh HISTORY
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The
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.Nm
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function call appeared in
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.Bx 4.2 .
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