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    Command:

    setegid

    
    
    

    SYNOPSIS

           #include <sys/types.h>
           #include <unistd.h>
    
           int seteuid(uid_t euid);
           int setegid(gid_t egid);
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           seteuid(), setegid():
               _BSD_SOURCE || _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600
    
    
    

    DESCRIPTION

           seteuid()  sets the effective user ID of the calling 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  calling 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 (respectively,
                  egid) is not the  real  user  (group)  ID,  the  effective  user
                  (group) ID, or the saved set-user-ID (saved set-group-ID).
    
    
    

    CONFORMING TO

           4.3BSD, POSIX.1-2001.
    
    
    

    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  glibc  2.0  seteuid(euid)  is  equivalent to
           setreuid(-1, euid) and hence may change the saved  set-user-ID.   Under
           glibc  2.1  and  later  it is equivalent to setresuid(-1, euid, -1) and
           hence does not change the saved set-user-ID.   Analogous  remarks  hold
           for  setegid(),  with  the difference that the change in implementation
           from setregid(-1, egid) to setresgid(-1, egid, -1)  occurred  in  glibc
           2.2 or 2.3 (depending on the hardware architecture).
    
           According to POSIX.1, seteuid() (setegid()) need not permit euid (egid)
           to be the same value as the current effective user (group) ID, and some
           implementations do not permit this.
    
    
    

    SEE ALSO

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