PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding Linux  manual  page  for  details  of
       Linux behavior), or the interface may not be implemented on Linux.

NAME

       seteuid — set effective user ID

SYNOPSIS

       #include <unistd.h>

       int seteuid(uid_t uid);

DESCRIPTION

       If  uid  is  equal  to  the  real  user ID or the saved set-user-ID, or if the process has
       appropriate privileges, seteuid() shall set the effective user ID of the  calling  process
       to uid; the real user ID and saved set-user-ID shall remain unchanged.

       The seteuid() function shall not affect the supplementary group list in any way.

RETURN VALUE

       Upon successful completion, 0 shall be returned; otherwise, -1 shall be returned and errno
       set to indicate the error.

ERRORS

       The seteuid() function shall fail if:

       EINVAL The  value  of  the  uid  argument  is  invalid  and  is  not  supported   by   the
              implementation.

       EPERM  The  process  does  not have appropriate privileges and uid does not match the real
              user ID or the saved set-user-ID.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       Refer to the RATIONALE section in setuid().

FUTURE DIRECTIONS

       None.

SEE ALSO

       exec,  getegid(),  geteuid(),  getgid(),  getuid(),   setegid(),   setgid(),   setregid(),
       setreuid(), setuid()

       The Base Definitions volume of POSIX.1‐2017, <sys_types.h>, <unistd.h>

COPYRIGHT

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1-2017, Standard for Information Technology -- Portable  Operating  System  Interface
       (POSIX),  The  Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by
       the Institute of Electrical and Electronics Engineers, Inc and The  Open  Group.   In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group  Standard  is  the  referee  document.  The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

       Any  typographical  or  formatting errors that appear in this page are most likely to have
       been introduced during the conversion of the source files to man page  format.  To  report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .