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SETREGID(2)		  OpenBSD Programmer's Manual		   SETREGID(2)

NAME
     setregid - set real and effective group IDs

SYNOPSIS
     #include <unistd.h>

     int
     setregid(gid_t rgid, gid_t egid);

DESCRIPTION
     The real and effective group IDs of the current process are set according
     to the arguments.	The saved group ID will be set to the new value of the
     real group ID if a real group ID is specified and either the new real
     group ID value is different from the current value or the effective group
     ID is changed to a value other than the current saved group ID.

     Unprivileged users may change either group ID to the current value of the
     real, effective, or saved group ID.  Only the superuser 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.

     The setregid() function was intended to allow swapping 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(2) function.

     When setting the real and effective group IDs to the same value, the
     setgid(2) function is preferred.

RETURN VALUES
     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 superuser and a change other
		   than changing the effective group ID to the real group ID
		   was specified.

SEE ALSO
     getgid(2), setegid(2), setgid(2), setresgid(2), setreuid(2)

STANDARDS
     The setregid() function conforms to the IEEE Std 1003.1-2001 (``POSIX'')
     and X/Open Portability Guide Issue 4.3 (``XPG4.3'').  specifications.

     Note, however, that prior to IEEE Std 1003.1-2001 (``POSIX''), the
     setregid() function was not a part of the IEEE Std 1003.1 (``POSIX'')
     specification.  As a result, it may not be implemented on all systems.

HISTORY
     The setregid() function call appeared in 4.2BSD.  A semantically
     different version appeared in 4.4BSD.  The current version, with the
     original semantics restored, appeared in OpenBSD 3.3.

CAVEATS
     The setregid() function predates POSIX saved group IDs.  This
     implementation changes the saved group ID to the new value of the real
     group ID only if the real group ID is specified and either changed or the
     effective group ID is changed to a value other than the current saved
     group ID.	Other implementations may behave differently.

OpenBSD 4.9			August 4, 2008			   OpenBSD 4.9

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