1GETEUID(3P)                POSIX Programmer's Manual               GETEUID(3P)
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PROLOG

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

12       geteuid — get the effective user ID
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SYNOPSIS

15       #include <unistd.h>
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17       uid_t geteuid(void);
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DESCRIPTION

20       The geteuid() function shall return the effective user ID of the  call‐
21       ing process.  The geteuid() function shall not modify errno.
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RETURN VALUE

24       The  geteuid()  function shall always be successful and no return value
25       is reserved to indicate an error.
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ERRORS

28       No errors are defined.
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30       The following sections are informative.
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EXAMPLES

33       None.
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APPLICATION USAGE

36       None.
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RATIONALE

39       In a conforming environment, geteuid() will always succeed. It is  pos‐
40       sible  for implementations to provide an extension where a process in a
41       non-conforming environment will not be associated with a user or  group
42       ID.  It  is  recommended that such implementations return (uid_t)-1 and
43       set errno to indicate such an environment; doing so  does  not  violate
44       this standard, since such an environment is already an extension.
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FUTURE DIRECTIONS

47       None.
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SEE ALSO

50       getegid(),   getgid(),   getuid(),   setegid(),   seteuid(),  setgid(),
51       setregid(), setreuid(), setuid()
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53       The Base Definitions volume of POSIX.1‐2017, <sys_types.h>, <unistd.h>
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56       Portions of this text are reprinted and reproduced in  electronic  form
57       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
58       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
59       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
60       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
61       event of any discrepancy between this version and the original IEEE and
62       The Open Group Standard, the original IEEE and The Open Group  Standard
63       is  the  referee document. The original Standard can be obtained online
64       at http://www.opengroup.org/unix/online.html .
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66       Any typographical or formatting errors that appear  in  this  page  are
67       most likely to have been introduced during the conversion of the source
68       files to man page format. To report such errors,  see  https://www.ker‐
69       nel.org/doc/man-pages/reporting_bugs.html .
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73IEEE/The Open Group                  2017                          GETEUID(3P)
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