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100 lines
3.2 KiB
100 lines
3.2 KiB
4 months ago
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.\" Copyright (c) 1994, 1996, 1997
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that: (1) source code distributions
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.\" retain the above copyright notice and this paragraph in its entirety, (2)
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.\" distributions including binary code include the above copyright notice and
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.\" this paragraph in its entirety in the documentation or other materials
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.\" provided with the distribution, and (3) all advertising materials mentioning
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.\" features or use of this software display the following acknowledgement:
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.\" ``This product includes software developed by the University of California,
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.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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.\" the University nor the names of its contributors may be used to endorse
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.\" or promote products derived from this software without specific prior
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.\" written permission.
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.TH PCAP_INIT 3PCAP "11 April 2020"
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.SH NAME
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pcap_init \- initialize the library
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.SH SYNOPSIS
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.nf
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.ft B
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#include <pcap/pcap.h>
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.ft
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.LP
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.nf
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.ft B
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char errbuf[PCAP_ERRBUF_SIZE];
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.ft
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.LP
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.ft B
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int pcap_init(unsigned int opts, char *errbuf);
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.ft
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.fi
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.SH DESCRIPTION
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.BR pcap_init ()
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is used to initialize the Packet Capture library.
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.I opts
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specifies options for the library;
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currently, the options are:
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.TP
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.B PCAP_CHAR_ENC_LOCAL
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Treat all strings supplied as arguments, and return all strings to the
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caller, as being in the local character encoding.
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.TP
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.B PCAP_CHAR_ENC_UTF_8
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Treat all strings supplied as arguments, and return all strings to the
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caller, as being in UTF-8.
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.PP
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On UNIX-like systems, the local character encoding is assumed to be
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UTF-8, so no character encoding transformations are done.
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.PP
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On Windows, the local character encoding is the local ANSI code page.
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.PP
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If
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.BR pcap_init ()
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is not called, strings are treated as being in the local ANSI code page
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on Windows,
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.BR pcap_lookupdev (3PCAP)
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will succeed if there is a device on which to capture, and
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.BR pcap_create (3PCAP)
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makes an attempt to check whether the string passed as an argument is a
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UTF-16LE string - note that this attempt is unsafe, as it may run past
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the end of the string - to handle
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.BR pcap_lookupdev ()
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returning a UTF-16LE string. Programs that don't call
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.BR pcap_init ()
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should, on Windows, call
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.BR pcap_wsockinit ()
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to initialize Winsock; this is not necessary if
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.BR pcap_init ()
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is called, as
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.BR pcap_init ()
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will initialize Winsock itself on Windows.
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.SH RETURN VALUE
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.BR pcap_init ()
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returns
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.B 0
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on success and
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.B \-1
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on failure.
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If
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.B \-1
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is returned,
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.I errbuf
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is filled in with an appropriate error message.
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.I errbuf
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is assumed to be able to hold at least
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.B PCAP_ERRBUF_SIZE
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chars.
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.SH BACKWARD COMPATIBILITY
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This function became available in libpcap release 1.10.0. In previous
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releases, on Windows, all strings supplied as arguments, and all strings
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returned to the caller, are in the local character encoding.
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.SH SEE ALSO
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.BR pcap (3PCAP)
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