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

       setreuid, setregid - set real and/or effective user or group ID

       #include <&lt;sys/types.h>&gt;
       #include <&lt;unistd.h>&gt;

       int setreuid(uid_t ruid, uid_t euid);
       int setregid(gid_t rgid, gid_t egid);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       setreuid(), setregid(): _BSD_SOURCE || _XOPEN_SOURCE >= 500

       setreuid() sets real and effective user IDs of the calling process.

       Supplying a value of -1 for either the real or effective user ID forces
       the system to leave that ID unchanged.

       Unprivileged processes may only set the effective user ID to  the  real
       user ID, the effective user ID or the saved set-user-ID.

       POSIX:  It  is  unspecified  whether unprivileged processes may set the
       real user ID to the real user ID, the effective user ID  or  the  saved

       Linux:  Unprivileged  users  may  only set the real user ID to the real
       user ID or the effective user ID.

       Linux: If the real user ID is set or the effective user ID is set to  a
       value  not  equal  to  the previous real user ID, the saved set-user-ID
       will be set to the new effective user ID.

       Completely analogously, setregid() sets real and effective  group  ID's
       of the calling process, and all of the above holds with "group" instead
       of "user".

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

       EPERM  The  calling process is not privileged (Linux: does not have the
              CAP_SETUID capability in the case of setreuid(), or the CAP_SET-
              GID  capability  in  the  case of setregid()) and a change other
              than (i) swapping the effective user (group) ID  with  the  real
              user  (group)  ID, or (ii) setting one to the value of the other
              or (iii) setting the effective user (group) ID to the  value  of
              the saved set-user-ID (saved set-group-ID) was specified.

       POSIX.1-2001,  4.3BSD  (the  setreuid()  and  setregid() function calls
       first appeared in 4.2BSD).

       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).

       getgid(2),  getuid(2),  seteuid(2), setgid(2), setresuid(2), setuid(2),

       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                             2007-07-26                       SETREUID(2)