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IF_PREPEND(9r)
NAME
  IF_PREPEND - Network: Adds an entry to the front of the output queue

SYNOPSIS
  #include <net/if.h>


  void IF_PREPEND(
	  struct ifqueue *ifq,
	  struct mbuf *m );

ARGUMENTS
  ifq Specifies a pointer to an ifqueue data structure.	 This data structure
      represents the output queue. Typically, a network driver's start
      interface references this queue through the if_snd member of the ifnet
      structure pointer.

  m   Specifies a pointer to an mbuf data structure. This data structure
      contains the memory buffer-related information that IF_PREPEND()
      manipulates.

DESCRIPTION
  The IF_PREPEND() routine adds an entry to the front of the output queue.
  Specifically, IF_PREPEND() performs the following tasks:

    ·  Performs a simple lock on the entry in the queue.

    ·  Puts an entry on the beginning of the output queue by operating on
       various members of the passed in ifqueue and mbuf structures.

    ·  Unlocks the simple lock on the entry in the queue.

NOTES
  You should raise the IPL to mask all LAN hardware interrupts by calling
  splimp() prior to calling the IF_PREPEND() routine.

RETURN VALUES
  None

FILES
  <net/if.h>






SEE ALSO
  Routines: IF_DEQUEUE(9r), IF_ENQUEUE(9r)


  Data Structures: mbuf(9s)

Index for Section 9

Alphabetical listing for I

Top of page