pfopen - Open a packet filter file
int flags );
Standard C Library (libc.so, libc.a)
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. Has the same meaning
as the corresponding argument to the open(2) system call.
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).
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
Files: bpf(7), packetfilter(7)
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