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

6       setgid - set-group-ID
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SYNOPSIS

9       #include <unistd.h>
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11       int setgid(gid_t gid);
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DESCRIPTION

15       If  the process has appropriate privileges, setgid() shall set the real
16       group ID, effective group ID, and the saved set-group-ID of the calling
17       process to gid.
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19       If  the  process does not have appropriate privileges, but gid is equal
20       to the real group ID or the saved set-group-ID, setgid() shall set  the
21       effective  group  ID  to  gid; the real group ID and saved set-group-ID
22       shall remain unchanged.
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24       The setgid() function shall not affect the supplementary group list  in
25       any way.
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27       Any  supplementary  group  IDs  of  the  calling  process  shall remain
28       unchanged.
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RETURN VALUE

31       Upon successful completion, 0  is  returned.  Otherwise,  -1  shall  be
32       returned and errno set to indicate the error.
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ERRORS

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

47       None.
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APPLICATION USAGE

50       None.
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RATIONALE

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

56       None.
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SEE ALSO

59       exec()  ,  getegid()  ,  geteuid()  , getgid() , getuid() , setegid() ,
60       seteuid() , setregid() , setreuid() , setuid() , the  Base  Definitions
61       volume of IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h>
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64       Portions  of  this text are reprinted and reproduced in electronic form
65       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
66       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
67       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
68       Electrical  and  Electronics  Engineers, Inc and The Open Group. 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.opengroup.org/unix/online.html .
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76IEEE/The Open Group                  2003                            SETGID(P)
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