setregid (3p) - Linux Man Pages
setregid: set real and effective group IDs
PROLOGThis manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
setregid - set real and effective group IDs
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 effective group ID to the saved set-group-ID or the real group ID.
The setregid() function shall fail if:
- The value of the rgid or egid argument is invalid or out-of-range.
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.
COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- 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 .