SETREGID Section: Linux Programmer's Manual (2) Updated: 2nd August 1994 Index   NAME setregid, setegid - set real and / or effective group ID   SYNOPSIS #include <unistd.h> int setregid(gid_t rgid, gid_t egid); int setegid(gid_t egid);   DESCRIPTION setregid sets real and effective group ID's of the current process. Un-privileged users may change the real group ID to the effective group ID and vice-versa. Prior to Linux 1.1.38, the saved ID paradigm, when used with setregid or setegid was broken. Starting at 1.1.38, it is also possible to set the effective group ID from the saved group ID. Only the super-user may make other changes. Supplying a value of -1 for either the real or effective group ID forces the system to leave that ID unchanged. Currently (libc-4.x.x), setegid(egid) is functionally equivalent to setregid(-1, egid). If the real group ID is changed or the effective group ID is set to a value not equal to the previous real group ID, the saved group ID will be set to the new effective group ID.   RETURN VALUE On success, zero is returned. On error, -1 is returned, and errno is set appropriately.   ERRORS EPERM The current process is not the super-user and changes other than (i) swapping the effective group ID with the real group ID or (ii) setting one to the value of the other or (iii) setting the effective group ID to the value of the saved group ID was specified.   CONFORMING TO BSD 4.3 (the setregid function call first appeared in 4.2BSD).   SEE ALSO   Index NAME SYNOPSIS DESCRIPTION RETURN VALUE ERRORS CONFORMING TO SEE ALSO This document was created by using the manual pages. Time: 11:56:07 GMT, March 24, 2025