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

12       setegid - set the effective group ID
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SYNOPSIS

15       #include <unistd.h>
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17       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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43       The following sections are informative.
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EXAMPLES

46       None.
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APPLICATION USAGE

49       None.
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RATIONALE

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

55       None.
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SEE ALSO

58       exec(),  getegid(), geteuid(), getgid(), getuid(), seteuid(), setgid(),
59       setregid(),  setreuid(),  setuid(),  the  Base  Definitions  volume  of
60       IEEE Std 1003.1-2001, <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, 2003 Edition, Standard for Information Technology
65       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
66       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
67       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
68       event of any discrepancy between this version and the original IEEE and
69       The  Open Group Standard, the original IEEE and The Open Group Standard
70       is the referee document. The original Standard can be  obtained  online
71       at http://www.opengroup.org/unix/online.html .
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75IEEE/The Open Group                  2003                          SETEGID(3P)
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