SETEUID(3)                 POSIX Programmer's Manual                SETEUID(3)



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

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 .



IEEE/The Open Group                  2017                           SETEUID(3)
