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BSD 2.11 - man page for setregid (bsd section 2)

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SETREGID(2)									      SETREGID(2)

       setregid - set real and effective group ID

       setregid(rgid, egid)
       int rgid, egid;

       The  real  and  effective  group  ID's  of  the	current process are set to the arguments.
       Unprivileged users may change the real group ID to the effective group ID and  vice-versa;
       only the super-user may make other changes.

       Supplying  a  value  of	-1 for either the real or effective group ID forces the system to
       substitute the current ID in place of the -1 parameter.

       Upon successful completion, a value of 0  is  returned.	 Otherwise,  a	value  of  -1  is
       returned and errno is set to indicate the error.

       [EPERM]	      The  current process is not the super-user and a change other than changing
		      the effective group-id to the real group-id was specified.

       getgid(2), setreuid(2), setgid(3)

4.2 Berkeley Distribution		   May 15, 1985 			      SETREGID(2)
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