/usr/include/varnish/vtcp.h is in libvarnishapi-dev 4.1.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (c) 2006 Verdens Gang AS
* Copyright (c) 2006-2011 Varnish Software AS
* All rights reserved.
*
* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
struct suckaddr;
/* from libvarnish/tcp.c */
/* NI_MAXHOST and NI_MAXSERV are ridiculously long for numeric format */
#define VTCP_ADDRBUFSIZE 64
#define VTCP_PORTBUFSIZE 16
int VTCP_Check(int a);
#define VTCP_Assert(a) assert(VTCP_Check(a))
struct suckaddr *VTCP_my_suckaddr(int sock);
void VTCP_myname(int sock, char *abuf, unsigned alen,
char *pbuf, unsigned plen);
void VTCP_hisname(int sock, char *abuf, unsigned alen,
char *pbuf, unsigned plen);
int VTCP_filter_http(int sock);
int VTCP_blocking(int sock);
int VTCP_nonblocking(int sock);
int VTCP_linger(int sock, int linger);
int VTCP_check_hup(int sock);
// #ifdef SOL_SOCKET
void VTCP_name(const struct suckaddr *addr, char *abuf, unsigned alen,
char *pbuf, unsigned plen);
int VTCP_connected(int s);
int VTCP_connect(const struct suckaddr *name, int msec);
int VTCP_open(const char *addr, const char *def_port, double timeout,
const char **err);
void VTCP_close(int *s);
int VTCP_bind(const struct suckaddr *addr, const char **errp);
int VTCP_listen(const struct suckaddr *addr, int depth, const char **errp);
int VTCP_listen_on(const char *addr, const char *def_port, int depth,
const char **errp);
void VTCP_set_read_timeout(int s, double seconds);
int VTCP_read(int fd, void *ptr, size_t len, double tmo);
// #endif
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