Man Seteuid en anglais
SETEGID(2)                 Linux Programmer's Manual                SETEGID(2)



 

NAME


       seteuid, setegid - set effective user or group ID

 

SYNOPSIS


       #include 
       #include 

       int seteuid(uid_t euid);
       int setegid(gid_t egid);

 

DESCRIPTION






       seteuid()  sets the effective user ID of the current process.  Unprivi-
       leged user processes may only set the effective user  ID  to  the  real
       user ID, the effective user ID or the saved set-user-ID.

       Precisely  the same holds for setegid() with "group" instead of "user".


 

RETURN VALUE


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

 

ERRORS


       EPERM  The  current process is not privileged (Linux: does not have the
              CAP_SETUID capability in the case of seteuid(), or the  CAP_SET-
              GID  capability in the case of setegid()) and euid (resp.  egid)
              is not the real user (group) ID, the effective user (group)  ID,
              or the saved set-user-ID (saved set-group-ID).

 

NOTES


       Setting  the  effective user (group) ID to the saved set-user-ID (saved
       set-group-ID) is possible since Linux 1.1.37 (1.1.38).  On an arbitrary
       system one should check _POSIX_SAVED_IDS.

       Under   libc4,  libc5  and  glibc2.0  seteuid(euid)  is  equivalent  to
       setreuid(-1, euid) and hence may change the saved  set-user-ID.   Under
       glibc2.1  it is equivalent to setresuid(-1, euid,-1) and hence does not
       change the saved set-user-ID.  Similar remarks hold for setegid().

 

CONFORMING TO


       4.3BSD, POSIX.1-2001.

 

SEE ALSO


       geteuid(2), setresuid(2), setreuid(2), setuid(2), capabilities(7)



Linux 2.6.6                       2004-05-27                        SETEGID(2)