ipc.h(3head)

1ipc.h(3HEAD)                        Headers                       ipc.h(3HEAD)
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NAME

6       ipc.h, ipc - XSI interprocess communication access structure
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SYNOPSIS

9       #include <sys/ipc.h>
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DESCRIPTION

13       The  <sys/ipc.h>  header  is  used by three mechanisms for interprocess
14       communication (IPC): messages, semaphores, and shared memory. All use a
15       common  structure type, ipc_perm, to pass information used in determin‐
16       ing permission to perform an IPC operation.
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19       The ipc_perm structure contains the following members:
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21         uid_t  uid     /* owner's user ID */
22         gid_t  gid     /* owner's group ID */
23         uid_t  cuid    /* creator's user ID */
24         gid_t  cgid    /* creator's group ID */
25         mode_t mode    /* read/write permission
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29       The uid_t, gid_t, mode_t, and key_t types are defined as  described  in
30       <sys/types.h>. See types.h(3HEAD).
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33       Definitions are provided for the constants listed below.
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36       Mode bits:
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38       IPC_CREAT     Create entry if key does not exist.
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41       IPC_EXCL      Fail if key exists.
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44       IPC_NOWAIT    Error if request must wait.
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48       Keys:
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50       IPC_PRIVATE    Private key.
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54       Control commands:
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56       IPC_RMID    Remove identifier.
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59       IPC_SET     Set options.
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62       IPC_STAT    Get options.
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ATTRIBUTES

66       See attributes(5) for descriptions of the following attributes:
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71       ┌─────────────────────────────┬─────────────────────────────┐
72       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
73       ├─────────────────────────────┼─────────────────────────────┤
74       │Interface Stability          │Standard                     │
75       └─────────────────────────────┴─────────────────────────────┘
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NAME

SYNOPSIS

DESCRIPTION

ATTRIBUTES

SEE ALSO