1SETREGID(P)                POSIX Programmer's Manual               SETREGID(P)
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NAME

6       setregid - set real and effective group IDs
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SYNOPSIS

9       #include <unistd.h>
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11       int setregid(gid_t rgid, gid_t egid);
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DESCRIPTION

15       The  setregid()  function shall set the real and effective group IDs of
16       the calling process.
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18       If rgid is -1, the real group ID shall not be changed; if egid  is  -1,
19       the effective group ID shall not be changed.
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21       The  real and effective group IDs may be set to different values in the
22       same call.
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24       Only a process with appropriate privileges can set the  real  group  ID
25       and the effective group ID to any valid value.
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27       A  non-privileged process can set either the real group ID to the saved
28       set-group-ID from one of the exec family of functions, or the effective
29       group ID to the saved set-group-ID or the real group ID.
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31       Any supplementary group IDs of the calling process remain unchanged.
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RETURN VALUE

34       Upon successful completion, 0 shall be returned. Otherwise, -1 shall be
35       returned and errno set to indicate the error, and neither of the  group
36       IDs are changed.
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ERRORS

39       The setregid() function shall fail if:
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41       EINVAL The  value  of  the  rgid or egid argument is invalid or out-of-
42              range.
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44       EPERM  The process does not have appropriate privileges  and  a  change
45              other than changing the real group ID to the saved set-group-ID,
46              or changing the effective group ID to the real group ID  or  the
47              saved set-group-ID, was requested.
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50       The following sections are informative.
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EXAMPLES

53       None.
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APPLICATION USAGE

56       If a set-group-ID process sets its effective group ID to its real group
57       ID, it can still set its effective group ID  back  to  the  saved  set-
58       group-ID.
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RATIONALE

61       None.
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FUTURE DIRECTIONS

64       None.
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SEE ALSO

67       exec()  ,  getegid()  ,  geteuid()  , getgid() , getuid() , setegid() ,
68       seteuid() , setgid() , setreuid() , setuid()  ,  the  Base  Definitions
69       volume of IEEE Std 1003.1-2001, <unistd.h>
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72       Portions  of  this text are reprinted and reproduced in electronic form
73       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
74       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
75       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
76       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
77       event of any discrepancy between this version and the original IEEE and
78       The  Open Group Standard, the original IEEE and The Open Group Standard
79       is the referee document. The original Standard can be  obtained  online
80       at http://www.opengroup.org/unix/online.html .
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84IEEE/The Open Group                  2003                          SETREGID(P)
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