Man Setgid en anglais
SETGID(2)                  Linux Programmer's Manual                 SETGID(2)



 

NAME


       setgid - set group identity

 

SYNOPSIS


       #include 
       #include 

       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 3.05 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.



Linux                             2002-03-09                         SETGID(2)