setgid(2) - phpMan

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 appropri-
       ately.

ERRORS
       EPERM  The calling process is not privileged (does not have the CAP_SETGID capabil-
              ity), 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 information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2002-03-09                         SETGID(2)

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