1sys_ipc.h(0P)              POSIX Programmer's Manual             sys_ipc.h(0P)
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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       sys/ipc.h — XSI interprocess communication access structure
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SYNOPSIS

16       #include <sys/ipc.h>
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DESCRIPTION

19       The <sys/ipc.h> header is used by three mechanisms for XSI interprocess
20       communication (IPC): messages, semaphores, and shared memory. All use a
21       common structure type, ipc_perm, to pass information used in  determin‐
22       ing permission to perform an IPC operation.
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24       The <sys/ipc.h> header shall define the ipc_perm structure, which shall
25       include the following members:
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27           uid_t    uid    Owner's user ID.
28           gid_t    gid    Owner's group ID.
29           uid_t    cuid   Creator's user ID.
30           gid_t    cgid   Creator's group ID.
31           mode_t   mode   Read/write permission.
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33       The <sys/ipc.h> header shall define the uid_t, gid_t, mode_t, and key_t
34       types as described in <sys/types.h>.
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36       The <sys/ipc.h> header shall define the following symbolic constants.
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38       Mode bits:
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40       IPC_CREAT   Create entry if key does not exist.
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42       IPC_EXCL    Fail if key exists.
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44       IPC_NOWAIT  Error if request must wait.
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46       Keys:
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48       IPC_PRIVATE Private key.
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50       Control commands:
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52       IPC_RMID    Remove identifier.
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54       IPC_SET     Set options.
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56       IPC_STAT    Get options.
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58       The  following  shall be declared as a function and may also be defined
59       as a macro. A function prototype shall be provided.
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61           key_t  ftok(const char *, int);
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63       The following sections are informative.
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APPLICATION USAGE

66       None.
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RATIONALE

69       None.
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FUTURE DIRECTIONS

72       None.
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SEE ALSO

75       <sys_types.h>
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77       The System Interfaces volume of POSIX.1‐2008, ftok()
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80       Portions of this text are reprinted and reproduced in  electronic  form
81       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
82       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
83       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
84       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
85       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
86       event of any discrepancy between this version and the original IEEE and
87       The  Open Group Standard, the original IEEE and The Open Group Standard
88       is the referee document. The original Standard can be  obtained  online
89       at http://www.unix.org/online.html .
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91       Any  typographical  or  formatting  errors that appear in this page are
92       most likely to have been introduced during the conversion of the source
93       files  to  man page format. To report such errors, see https://www.ker‐
94       nel.org/doc/man-pages/reporting_bugs.html .
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98IEEE/The Open Group                  2013                        sys_ipc.h(0P)
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