osf1 man page for setregid

setregid(2)							System Calls Manual						       setregid(2)

NAME
       setregid - Sets the real and effective group ID

SYNOPSIS
       #include <unistd.h>

       setregid(      gid_t rgid,      gid_t egid );

STANDARDS
       Interfaces documented on this reference page conform to industry standards as follows:

       setregid():  XPG4-UNIX

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS
       Specifies the new real group ID.  Specifies the new effective group ID.

DESCRIPTION
       The  setregid() function sets the real group ID of the current process to the value specified by the rgid parameter, and sets the effective
       group ID to the value specified by the egid parameter.  If the value of rgid is -1, the real group ID is not changed; if the value of  egid
       is -1, the effective group ID is not changed.  The real and effective group IDs may be set to different values in the same call.

       Unprivileged users may change the effective group ID to the real group ID; only the superuser may make other changes.

       Any supplementary group IDs of the calling process remain unchanged.

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

ERRORS
       The setregid() function sets errno to the specified values for the following conditions:

       The  value of the rgid egid parameter is invalid or out of range.  The current process does not have superuser privilege and a change other
       than changing the effective group ID to the real group ID was specified.

RELATED INFORMATION
       Functions: getgid(2), setgid(2), setrgid(3), setreuid(2)

       Standards: standards(5) delim off

																       setregid(2)