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



NAME
       seteuid, setegid - set effective user or group ID

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.  Unprivileged 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_SETGID 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.  Similar remarks hold for setegid().

SEE ALSO
       geteuid(2), setresuid(2), setreuid(2), setuid(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                             2007-07-26                        SETEUID(2)