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

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SETREGID(2)									      SETREGID(2)

NAME
       setregid - set real and effective group ID

SYNOPSIS
       setregid(rgid, egid)
       int rgid, egid;

DESCRIPTION
       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.

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

ERRORS
       [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.

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

4.2 Berkeley Distribution		   May 15, 1985 			      SETREGID(2)
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