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msgop.2: Clarify wording of MSGMAX and MSGMNB limits
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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man2/msgop.2
18
man2/msgop.2
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@ -517,23 +517,25 @@ The following limits on message queue resources affect the
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call:
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call:
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.TP
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.TP
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.B MSGMAX
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.B MSGMAX
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Maximum size for a message text: 8192 bytes
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Maximum size of a message text, in bytes (default value: 8192 bytes).
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(on Linux, this limit can be read and modified via
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On Linux, this limit can be read and modified via
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.IR /proc/sys/kernel/msgmax ).
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.IR /proc/sys/kernel/msgmax .
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.TP
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.TP
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.B MSGMNB
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.B MSGMNB
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Default maximum size in bytes of a message queue: 16384 bytes
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Maximum number of bytes that can be held in a message queue
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(on Linux, this limit can be read and modified via
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(default value: 16384 bytes).
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.IR /proc/sys/kernel/msgmnb ).
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On Linux, this limit can be read and modified via
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.IR /proc/sys/kernel/msgmnb .
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A privileged process
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A privileged process
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(Linux: a process with the
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(Linux: a process with the
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.B CAP_SYS_RESOURCE
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.B CAP_SYS_RESOURCE
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capability)
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capability)
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can increase the size of a message queue beyond
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can increase the size of a message queue beyond
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.B MSGMNB
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.B MSGMNB
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by a
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using the
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.BR msgctl (2)
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.BR msgctl (2)
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system call.
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.B IPC_SET
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operation.
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.PP
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.PP
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The implementation has no intrinsic system-wide limits on the
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The implementation has no intrinsic system-wide limits on the
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number of message headers
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number of message headers
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