Provided by: manpages-posix-dev_2.16-1_all 
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 group ID or the
saved set-group-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 IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 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 .