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SETGID(2)                  Linux Programmer's Manual                 SETGID(2)



NAME
       setgid - set group identity

SYNOPSIS
       #include <sys/types.h>
       #include <unistd.h>

       int setgid(gid_t gid);

DESCRIPTION
       setgid()  sets the effective group ID of the calling process.  If the caller is the superuser, the real GID and
       saved set-group-ID are also set.

       Under Linux, setgid() is implemented like the POSIX version with the _POSIX_SAVED_IDS feature.  This  allows  a
       set-group-ID  program  that  is not set-user-ID-root to drop all of its group privileges, do some un-privileged
       work, and then re-engage the original effective group ID in a secure manner.

RETURN VALUE
       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

ERRORS
       EPERM  The calling process is not privileged (does not have the CAP_SETGID capability), and gid does not  match
              the effective group ID or saved set-group-ID of the calling process.

CONFORMING TO
       SVr4, POSIX.1-2001.

SEE ALSO
       getgid(2), setegid(2), setregid(2), capabilities(7), credentials(7)

COLOPHON
       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2002-03-09                         SETGID(2)