1SETEGID(3P)                POSIX Programmer's Manual               SETEGID(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

13       setegid — set the effective group ID
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SYNOPSIS

16       #include <unistd.h>
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18       int setegid(gid_t gid);
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DESCRIPTION

21       If gid is equal to the real group ID or the saved set-group-ID,  or  if
22       the  process has appropriate privileges, setegid() shall set the effec‐
23       tive group ID of the calling process to gid; the real group  ID,  saved
24       set-group-ID, and any supplementary group IDs shall remain unchanged.
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26       The setegid() function shall not affect the supplementary group list in
27       any way.
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RETURN VALUE

30       Upon successful completion, 0 shall be returned; otherwise, −1 shall be
31       returned and errno set to indicate the error.
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ERRORS

34       The setegid() function shall fail if:
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36       EINVAL The value of the gid argument is invalid and is not supported by
37              the implementation.
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39       EPERM  The process does not have appropriate privileges  and  gid  does
40              not match the real group ID or the saved set-group-ID.
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42       The following sections are informative.
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EXAMPLES

45       None.
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APPLICATION USAGE

48       None.
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RATIONALE

51       Refer to the RATIONALE section in setuid().
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FUTURE DIRECTIONS

54       None.
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SEE ALSO

57       exec,  getegid(),  geteuid(),  getgid(), getuid(), seteuid(), setgid(),
58       setregid(), setreuid(), setuid()
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60       The Base Definitions volume of POSIX.1‐2008, <sys_types.h>, <unistd.h>
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63       Portions of this text are reprinted and reproduced in  electronic  form
64       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
65       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
66       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
67       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
68       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
69       event of any discrepancy between this version and the original IEEE and
70       The  Open Group Standard, the original IEEE and The Open Group Standard
71       is the referee document. The original Standard can be  obtained  online
72       at http://www.unix.org/online.html .
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74       Any  typographical  or  formatting  errors that appear in this page are
75       most likely to have been introduced during the conversion of the source
76       files  to  man page format. To report such errors, see https://www.ker‐
77       nel.org/doc/man-pages/reporting_bugs.html .
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81IEEE/The Open Group                  2013                          SETEGID(3P)
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