Index for Section 3

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pfopen(3)
NAME
  pfopen - Open a packet filter file

SYNOPSIS
  int pfopen(
	  char *ifname,
	  int flags );

LIBRARY
  Standard C Library (libc.so, libc.a)

PARAMETERS
  ifname
      Points to a null-terminated string containing the name of the interface
      for which the application is opening the packet filter. This name may
      be the name of an actual interface on the system (for example, ln0) or
      it may be a pseudo-interface name of the form pfn, used to specify the
      nth interface attached to the system.  For example, pf0 specifies the
      first such interface.  If ifname is NULL, the default interface (pf0)
      is used.

  flags
      Has the same meaning as the corresponding argument to the open(2)
      system call.

DESCRIPTION
  The packet filter (see packetfilter(7)) provides raw access to Ethernets
  and similar network data link layers. The pfopen() function is used to open
  a packet filter file descriptor. The function hides various details about
  the way packet filter files are opened and named.

  The file descriptor returned by pfopen() is otherwise identical to one
  returned by open(2).

ERRORS
  The pfopen() function returns a negative integer if the file could not be
  opened. This may be because of resource limitations, or because the
  specified interface does not exist.

SEE ALSO
  Functions: open(2)

  Files: bpf(7), packetfilter(7)

Index for Section 3

Alphabetical listing for P

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