setregid(2) [netbsd man page]

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

NAME

     setregid -- set real and effective group ID's

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     setregid(gid_t rgid, gid_t egid);

DESCRIPTION

     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 equivalent to the setegid() function.

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 super-user 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), setuid(2)

HISTORY

     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

SETREGID(P)						     POSIX Programmer's Manual						       SETREGID(P)

NAME

       setregid - set real and effective group IDs

SYNOPSIS

       #include <unistd.h>

       int setregid(gid_t rgid, gid_t egid);

DESCRIPTION

       The setregid() function shall set the real and effective group IDs of the calling process.

       If rgid is -1, the real group ID shall not be changed; if egid is -1, the effective group ID shall not be changed.

       The real and effective group IDs may be set to different values in the same call.

       Only a process with appropriate privileges can set the real group ID and the effective group ID to any valid value.

       A non-privileged process can set either the real group ID to the saved set-group-ID from one of the exec family of functions, or the effec-
       tive group ID to the saved set-group-ID or the real group ID.

       Any supplementary group IDs of the calling process remain unchanged.

RETURN VALUE

       Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and errno set to indicate the error, and  neither  of  the
       group IDs are changed.

ERRORS

       The setregid() function shall fail if:

       EINVAL The value of the rgid or egid argument is invalid or out-of-range.

       EPERM  The  process  does  not have appropriate privileges and a change other than changing the real group ID to the saved set-group-ID, or
	      changing the effective group ID to the real group ID or the saved set-group-ID, was requested.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       If a set-group-ID process sets its effective group ID to its real group ID, it can still set its effective group ID back to the saved  set-
       group-ID.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       exec() , getegid() , geteuid() , getgid() , getuid() , setegid() , seteuid() , setgid() , setreuid() , setuid() , the Base Definitions vol-
       ume of IEEE Std 1003.1-2001, <unistd.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and  the  original  IEEE
       and  The  Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003							       SETREGID(P)