PCAP_INIT(3PCAP) PCAP_INIT(3PCAP)
NAME
pcap_init - initialize the library
SYNOPSIS
#include <pcap/pcap.h>
char errbuf[PCAP_ERRBUF_SIZE];
int pcap_init(unsigned int opts, char *errbuf);
DESCRIPTION
pcap_init() is used to initialize the Packet Capture library. opts
specifies options for the library; currently, the options are:
PCAP_CHAR_ENC_LOCAL
Treat all strings supplied as arguments, and return all strings
to the caller, as being in the local character encoding.
PCAP_CHAR_ENC_UTF_8
Treat all strings supplied as arguments, and return all strings
to the caller, as being in UTF-8.
On UNIX-like systems, the local character encoding is assumed to be
UTF-8, so no character encoding transformations are done.
On Windows, the local character encoding is the local ANSI code page.
If pcap_init() is not called, strings are treated as being in the local
ANSI code page on Windows, pcap_lookupdev(3PCAP) will succeed if there
is a device on which to capture, and pcap_create(3PCAP) makes an at-
tempt to check whether the string passed as an argument is a UTF-16LE
string - note that this attempt is unsafe, as it may run past the end
of the string - to handle pcap_lookupdev() returning a UTF-16LE string.
Programs that don't call pcap_init() should, on Windows, call
pcap_wsockinit() to initialize Winsock; this is not necessary if
pcap_init() is called, as pcap_init() will initialize Winsock itself on
Windows.
RETURN VALUE
pcap_init() returns 0 on success and PCAP_ERROR on failure. If
PCAP_ERROR is returned, errbuf is filled in with an appropriate error
message. errbuf is assumed to be able to hold at least PCAP_ER-
RBUF_SIZE chars.
BACKWARD COMPATIBILITY
This function became available in libpcap release 1.9.0. In previous
releases, on Windows, all strings supplied as arguments, and all
strings returned to the caller, are in the local character encoding.
SEE ALSO
pcap(3PCAP)
4 May 2022 PCAP_INIT(3PCAP)
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