Originální popis anglicky:
setgid - set-group-ID
Návod, kniha: POSIX Programmer's Manual
#include <unistd.h>
int setgid(gid_t
gid);
If the process has appropriate privileges,
setgid() shall set the real
group ID, effective group ID, and the saved set-group-ID of the calling
process to
gid.
If the process does not have appropriate privileges, but
gid is equal to
the real group ID or the saved set-group-ID,
setgid() shall set the
effective group ID to
gid; the real group ID and saved set-group-ID
shall remain unchanged.
The
setgid() function shall not affect the supplementary group list in
any way.
Any supplementary group IDs of the calling process shall remain unchanged.
Upon successful completion, 0 is returned. Otherwise, -1 shall be returned and
errno set to indicate the error.
The
setgid() function shall fail if:
- EINVAL
- The value of the gid argument is invalid and is not
supported by the implementation.
- EPERM
- The process does not have appropriate privileges and
gid does not match the real group ID or the saved set-group-ID.
The following sections are informative.
None.
None.
Refer to the RATIONALE section in
setuid() .
None.
exec() ,
getegid() ,
geteuid() ,
getgid() ,
getuid() ,
setegid() ,
seteuid() ,
setregid() ,
setreuid() ,
setuid() , the Base Definitions volume of
IEEE Std 1003.1-2001,
<sys/types.h>,
<unistd.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
