setgroups man page on 4.4BSD

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SETGROUPS(2)		    BSD System Calls Manual		  SETGROUPS(2)

NAME
     setgroups — set group access list

SYNOPSIS
     #include <sys/param.h>
     #include <unistd.h>

     int
     setgroups(int ngroups, const gid_t *gidset);

DESCRIPTION
     Setgroups() sets the group access list of the current user process
     according to the array gidset.  The parameter ngroups indicates the num‐
     ber of entries in the array and must be no more than NGROUPS, as defined
     in ⟨sys/param.h⟩.

     Only the super-user may set new groups.

RETURN VALUES
     A 0 value is returned on success, -1 on error, with an error code stored
     in errno.

ERRORS
     The setgroups() call will fail if:

     [EPERM]		The caller is not the super-user.

     [EFAULT]		The address specified for gidset is outside the
			process address space.

SEE ALSO
     getgroups(2), initgroups(3)

HISTORY
     The setgroups function call appeared in 4.2BSD.

4.2 Berkeley Distribution	April 16, 1994	     4.2 Berkeley Distribution
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