(ipc.info.gz) msglimits

 
 1.5.5 Limis on Message Resources
 --------------------------------
 
 Sizeof various structures:
      msqid_ds        52   /* 1 per message  queue .. dynamic */
 
      msg             16   /* 1 for each message in system .. dynamic */
 
      msgbuf           8   /* allocated by user */
 
 Limits
    * MSGMNI : number of message queue identifiers ... policy.
 
    * MSGMAX : max size of message.  Header and message space allocated
      on one page.  MSGMAX = (PAGE_SIZE - sizeof(struct msg)).
      Implementation maximum MSGMAX = 4080.
 
    * MSGMNB : default max size of a message queue ... policy.  The
      super-user can increase the size of a queue beyond MSGMNB by a
      `msgctl' call.
 
 Unused or unimplemented:
 MSGTQL  max number of message headers system-wide.
 MSGPOOL total size in bytes of msg pool.

Info Catalog

(ipc.info.gz) msgctl

(ipc.info.gz) Messages

(ipc.info.gz) Semaphores

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