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OpenSolaris 2009.06 - man page for setgroups (opensolaris section 2)

getgroups(2)				   System Calls 			     getgroups(2)

NAME
       getgroups, setgroups - get or set supplementary group access list IDs

SYNOPSIS
       #include <unistd.h>

       int getgroups(int gidsetsize, gid_t *grouplist);

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

DESCRIPTION
       The  getgroups()  function  gets the current supplemental group access list of the calling
       process and stores the result in the array of group IDs specified by grouplist. This array
       has gidsetsize entries and must be large enough to contain the entire list. This list can-
       not be larger than NGROUPS_UMAX. If gidsetsize equals 0, getgroups() will return the  num-
       ber  of groups to which the calling process belongs without modifying the array pointed to
       by grouplist.

       The setgroups() function sets the supplementary group access list of the  calling  process
       from  the array of group IDs specified by grouplist. The number of entries is specified by
       ngroups and can not be greater than NGROUPS_MAX.

RETURN VALUES
       Upon successful completion, getgroups() returns the number of supplementary group IDs  set
       for  the calling process and setgroups() returns 0. Otherwise, -1 is returned and errno is
       set to indicate the error.

ERRORS
       The getgroups() and setgroups() functions will fail if:

       EFAULT	 A referenced part of the array pointed to by grouplist is an illegal address.

       The getgroups() function will fail if:

       EINVAL	 The value of gidsetsize is non-zero and less than the	number	of  supplementary
		 group IDs set for the calling process.

       The setgroups() function will fail if:

       EINVAL	 The value of ngroups is greater than {NGROUPS_MAX}.

       EPERM	 The  {PRIV_PROC_SETID}  privilege  is	not  asserted in the effective set of the
		 calling process.

USAGE
       Use of the setgroups() function requires the {PRIV_PROC_SETID} privilege.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |getgroups() is Standard.	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+

SEE ALSO
       groups(1), chown(2), getuid(2), setuid(2),  getgrnam(3C),  initgroups(3C),  attributes(5),
       privileges(5), standards(5)

SunOS 5.11				    8 Sep 2006				     getgroups(2)


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