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

       seteuid, setegid - set effective user or group ID

       #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

       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".

       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
              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).

       4.3BSD, POSIX.1-2001.

       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().

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

       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

Linux                             2007-07-26                        SETEUID(2)