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<TITLE>getgroups</TITLE>
<body bgcolor="#ffffcc">
<hr>
<pre>
<h3>GETGROUPS(2) Linux Programmer's Manual GETGROUPS(2)
</h3>
<h3>NAME
</h3> getgroups, setgroups - get/set group access list
<h3>SYNOPSIS
</h3> #include <unistd.h>
int getgroups(int size, gid_t list[]);
#define __USE_BSD
#include <grp.h>
int setgroups(size_t size, const gid_t *list);
<h3>DESCRIPTION
</h3> getgroups
Up to size supplemental groups are returned in
list. If size is zero, list is not modified, but
the total number of supplemental groups for the
process is returned.
setgroups
Sets the supplemental groups for the process. Only
the super-user may use this function.
<h3>RETURN VALUE
</h3> getgroups
On success, the number of groups stored in list is
returned (if size is zero, however, the number of
supplemental group IDs associated with the process
is returned). On error, -1 is returned, and errno
is set appropriately.
setgroups
On success, zero is returned. On error, -1 is
returned, and errno is set appropriately.
<h3>ERRORS
</h3> EFAULT list has an invalid address.
EPERM For setgroups, the user is not the super-user.
EINVAL For setgroups, gidsetsize is greater than NGROUPS
(32 for Linux 0.99.11).
<h3>CONFORMING TO
</h3> getgroups conforms to POSIX.1 (and is present in BSD 4.3).
Since setgroups requires privilege, it is not covered
under POSIX.1.
<h3>BUGS
</h3> The __USE_BSD flag probably shouldn't be required for set-
groups.
<h3>Linux 0.99.11 23 July 1993 1
</h3>
<h3>GETGROUPS(2) Linux Programmer's Manual GETGROUPS(2)
</h3>
</pre>
<hr>
<h3>SEE ALSO
</h3><p>
<a href=initgroups.htm>initgroups</a>,
<pre>
<h3>Linux 0.99.11 23 July 1993 2
</h3>
</pre>
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