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NetBSD 6.1.5 - man page for setregid (netbsd section 2)

SETREGID(2)			     BSD System Calls Manual			      SETREGID(2)

     setregid -- set real and effective group ID's

     Standard C Library (libc, -lc)

     #include <unistd.h>

     setregid(gid_t rgid, gid_t egid);

     This interface is made obsolete by the saved ID functionality in setgid(2) and setegid(2).

     The real and effective group ID's of the current process are set according to the arguments.
     If the real group ID is changed, the saved group ID is changed to the new value of the
     effective group ID.

     If rgid or egid is -1, the current gid is filled in by the system.  Unprivileged users may
     change the real group ID to the effective group ID, and may change the effective group ID to
     the real group ID or the saved group ID; only the super-user may make other changes.

     The setregid() function has been used to swap the real and effective group IDs in set-group-
     ID programs to temporarily relinquish the set-group-ID value.  This purpose is now better
     served by the use of the setegid() function (see setgid(2)).

     When setting the real and effective group IDs to the same value, this function is equivalent
     to the setgid() function.	When setting only the effective group ID, this function is equiv-
     alent to the setegid() function.

     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 chang-
			ing the effective group-id to the real group-id was specified.

     getgid(2), setegid(2), setgid(2), setuid(2)

     The setregid() function call appeared in 4.2BSD.  An incompatible version was implemented in
     4.4BSD.  It was reimplemented in NetBSD 1.2 in a way compatible with 4.3BSD, SunOS and
     Linux, but should not be used in new code.

BSD					 January 5, 2001				      BSD

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