1<sys/ipc.h>(0P)            POSIX Programmer's Manual           <sys/ipc.h>(0P)
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NAME

6       sys/ipc.h - XSI interprocess communication access structure
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SYNOPSIS

9       #include <sys/ipc.h>
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DESCRIPTION

12       The <sys/ipc.h> header is used by three mechanisms for XSI interprocess
13       communication (IPC): messages, semaphores, and shared memory. All use a
14       common  structure type, ipc_perm, to pass information used in determin‐
15       ing permission to perform an IPC operation.
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17       The ipc_perm structure shall contain the following members:
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20              uid_t    uid    Owner's user ID.
21              gid_t    gid    Owner's group ID.
22              uid_t    cuid   Creator's user ID.
23              gid_t    cgid   Creator's group ID.
24              mode_t   mode   Read/write permission.
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26       The uid_t, gid_t, mode_t, and key_t types shall be defined as described
27       in <sys/types.h> .
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29       Definitions shall be provided for the following constants:
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31       Mode bits:
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33       IPC_CREAT
34              Create entry if key does not exist.
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36       IPC_EXCL
37              Fail if key exists.
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39       IPC_NOWAIT
40              Error if request must wait.
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43       Keys:
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45       IPC_PRIVATE
46              Private key.
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49       Control commands:
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51       IPC_RMID
52              Remove identifier.
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54       IPC_SET
55              Set options.
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57       IPC_STAT
58              Get options.
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61       The  following  shall be declared as a function and may also be defined
62       as a macro. A function prototype shall be provided.
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65              key_t  ftok(const char *, int);
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67       The following sections are informative.
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APPLICATION USAGE

70       None.
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RATIONALE

73       None.
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FUTURE DIRECTIONS

76       None.
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SEE ALSO

79       <sys/types.h>, the System Interfaces  volume  of  IEEE Std 1003.1-2001,
80       ftok()
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83       Portions  of  this text are reprinted and reproduced in electronic form
84       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
85       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
86       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
87       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
88       event of any discrepancy between this version and the original IEEE and
89       The  Open Group Standard, the original IEEE and The Open Group Standard
90       is the referee document. The original Standard can be  obtained  online
91       at http://www.opengroup.org/unix/online.html .
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95IEEE/The Open Group                  2003                      <sys/ipc.h>(0P)
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