/usr/include/arpa/inet.h is in libc6-dev 2.27-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | /* Copyright (C) 1997-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _ARPA_INET_H
#define _ARPA_INET_H 1
#include <features.h>
#include <netinet/in.h> /* To define `struct in_addr'. */
/* Type for length arguments in socket calls. */
#ifndef __socklen_t_defined
typedef __socklen_t socklen_t;
# define __socklen_t_defined
#endif
__BEGIN_DECLS
/* Convert Internet host address from numbers-and-dots notation in CP
into binary data in network byte order. */
extern in_addr_t inet_addr (const char *__cp) __THROW;
/* Return the local host address part of the Internet address in IN. */
extern in_addr_t inet_lnaof (struct in_addr __in) __THROW;
/* Make Internet host address in network byte order by combining the
network number NET with the local address HOST. */
extern struct in_addr inet_makeaddr (in_addr_t __net, in_addr_t __host)
__THROW;
/* Return network number part of the Internet address IN. */
extern in_addr_t inet_netof (struct in_addr __in) __THROW;
/* Extract the network number in network byte order from the address
in numbers-and-dots natation starting at CP. */
extern in_addr_t inet_network (const char *__cp) __THROW;
/* Convert Internet number in IN to ASCII representation. The return value
is a pointer to an internal array containing the string. */
extern char *inet_ntoa (struct in_addr __in) __THROW;
/* Convert from presentation format of an Internet number in buffer
starting at CP to the binary network format and store result for
interface type AF in buffer starting at BUF. */
extern int inet_pton (int __af, const char *__restrict __cp,
void *__restrict __buf) __THROW;
/* Convert a Internet address in binary network format for interface
type AF in buffer starting at CP to presentation form and place
result in buffer of length LEN astarting at BUF. */
extern const char *inet_ntop (int __af, const void *__restrict __cp,
char *__restrict __buf, socklen_t __len)
__THROW;
/* The following functions are not part of XNS 5.2. */
#ifdef __USE_MISC
/* Convert Internet host address from numbers-and-dots notation in CP
into binary data and store the result in the structure INP. */
extern int inet_aton (const char *__cp, struct in_addr *__inp) __THROW;
/* Format a network number NET into presentation format and place result
in buffer starting at BUF with length of LEN bytes. */
extern char *inet_neta (in_addr_t __net, char *__buf, size_t __len) __THROW;
/* Convert network number for interface type AF in buffer starting at
CP to presentation format. The result will specifiy BITS bits of
the number. */
extern char *inet_net_ntop (int __af, const void *__cp, int __bits,
char *__buf, size_t __len) __THROW;
/* Convert network number for interface type AF from presentation in
buffer starting at CP to network format and store result int
buffer starting at BUF of size LEN. */
extern int inet_net_pton (int __af, const char *__cp,
void *__buf, size_t __len) __THROW;
/* Convert ASCII representation in hexadecimal form of the Internet
address to binary form and place result in buffer of length LEN
starting at BUF. */
extern unsigned int inet_nsap_addr (const char *__cp,
unsigned char *__buf, int __len) __THROW;
/* Convert internet address in binary form in LEN bytes starting at CP
a presentation form and place result in BUF. */
extern char *inet_nsap_ntoa (int __len, const unsigned char *__cp,
char *__buf) __THROW;
#endif
__END_DECLS
#endif /* arpa/inet.h */
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