golden hour

/usr/include/bits

File/Folder	Size	Actions
a.out.h	268 B
byteswap-16.h	1.69 KB
byteswap.h	5.56 KB
cmathcalls.h	4.7 KB
confname.h	23.19 KB
dirent.h	1.69 KB
dlfcn.h	2.47 KB
elfclass.h	426 B
endian.h	176 B
environments.h	3.5 KB
epoll.h	1.11 KB
errno.h	2.11 KB
error.h	2.62 KB
eventfd.h	1.1 KB
fcntl-linux.h	12.55 KB
fcntl.h	2.19 KB
fcntl2.h	5.44 KB
fenv.h	3.94 KB
fenvinline.h	190 B
huge_val.h	1.83 KB
huge_valf.h	1.79 KB
huge_vall.h	1.57 KB
hwcap.h	966 B
in.h	9.01 KB
inf.h	1.03 KB
initspin.h	25 B
inotify.h	1.05 KB
ioctl-types.h	2.41 KB
ioctls.h	4.38 KB
ipc.h	2.01 KB
ipctypes.h	1.14 KB
libc-lock.h	12.54 KB
libio-ldbl.h	1014 B
link.h	4.2 KB
local_lim.h	3.13 KB
locale.h	1.33 KB
math-finite.h	14.24 KB
mathcalls.h	11.3 KB
mathdef.h	2.14 KB
mathinline.h	30.86 KB
mman.h	4.78 KB
monetary-ldbl.h	1.02 KB
mqueue.h	1.22 KB
mqueue2.h	2.11 KB
msq.h	2.47 KB
nan.h	1.54 KB
netdb.h	1.25 KB
param.h	1.4 KB
poll.h	2.04 KB
poll2.h	2.86 KB
posix1_lim.h	4.81 KB
posix2_lim.h	2.82 KB
posix_opt.h	5.65 KB
printf-ldbl.h	986 B
pthreadtypes.h	6.33 KB
resource.h	9.21 KB
sched.h	7.37 KB
select.h	2.08 KB
select2.h	1.4 KB
sem.h	2.53 KB
semaphore.h	1.21 KB
setjmp.h	1.26 KB
setjmp2.h	1.67 KB
shm.h	3.44 KB
sigaction.h	2.79 KB
sigcontext.h	4.08 KB
siginfo.h	9.81 KB
signalfd.h	1.04 KB
signum.h	3.34 KB
sigset.h	4.48 KB
sigstack.h	1.49 KB
sigthread.h	1.64 KB
sockaddr.h	1.5 KB
socket.h	12.6 KB
socket2.h	2.95 KB
socket_type.h	2.16 KB
stab.def	8.82 KB
stat.h	7.46 KB
statfs.h	1.89 KB
statvfs.h	3.34 KB
stdio-ldbl.h	3.11 KB
stdio-lock.h	2.14 KB
stdio.h	5.45 KB
stdio2.h	12.36 KB
stdio_lim.h	1.34 KB
stdlib-float.h	1.12 KB
stdlib-ldbl.h	1.36 KB
stdlib.h	5.53 KB
string.h	56.48 KB
string2.h	46.08 KB
string3.h	4.38 KB
sys_errlist.h	1.19 KB
syscall.h	43.03 KB
sysctl.h	893 B
syslog-ldbl.h	1.17 KB
syslog-path.h	1.03 KB
syslog.h	1.66 KB
termios.h	5.23 KB
time.h	3.35 KB
timerfd.h	1.08 KB
timex.h	4.36 KB
types.h	7.55 KB
typesizes.h	3.15 KB
uio.h	2.42 KB
unistd.h	13.07 KB
ustat.h	1.06 KB
utmp.h	3.87 KB
utmpx.h	3.38 KB
utsname.h	1.19 KB
waitflags.h	1.61 KB
waitstatus.h	3.49 KB
wchar-ldbl.h	2.45 KB
wchar.h	1.11 KB
wchar2.h	20.04 KB
wordsize.h	327 B
xopen_lim.h	3.68 KB

Edit: in.h

/* Copyright (C) 1991-2012 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/>.  */

/* Linux version.  */

#ifndef _NETINET_IN_H
# error "Never use <bits/in.h> directly; include <netinet/in.h> instead."
#endif

/* If the application has already included linux/in6.h from a linux-based
   kernel then we will not define the IPv6 IPPROTO_* defines, in6_addr (nor the
   defines), sockaddr_in6, or ipv6_mreq. Same for in6_ptkinfo or ip6_mtuinfo
   in linux/ipv6.h. The ABI used by the linux-kernel and glibc match exactly.
   Neither the linux kernel nor glibc should break this ABI without coordination.
   In upstream kernel 56c176c9 the _UAPI prefix was stripped so we need to check
   for _LINUX_IN6_H and _IPV6_H now, and keep checking the old versions for
   maximum backwards compatibility.  */
#if defined _UAPI_LINUX_IN6_H \
    || defined _UAPI_IPV6_H \
    || defined _LINUX_IN6_H \
    || defined _IPV6_H
/* This is not quite the same API since the kernel always defines s6_addr16 and
   s6_addr32. This is not a violation of POSIX since POSIX says "at least the
   following member" and that holds true.  */
# define __USE_KERNEL_IPV6_DEFS 1
#else
# define __USE_KERNEL_IPV6_DEFS 0
#endif

/* Options for use with `getsockopt' and `setsockopt' at the IP level.
   The first word in the comment at the right is the data type used;
   "bool" means a boolean value stored in an `int'.  */
#define        IP_OPTIONS      4       /* ip_opts; IP per-packet options.  */
#define        IP_HDRINCL      3       /* int; Header is included with data.  */
#define        IP_TOS          1       /* int; IP type of service and precedence.  */
#define        IP_TTL          2       /* int; IP time to live.  */
#define        IP_RECVOPTS     6       /* bool; Receive all IP options w/datagram.  */
/* For BSD compatibility.  */
#define        IP_RECVRETOPTS  IP_RETOPTS       /* bool; Receive IP options for response.  */
#define        IP_RETOPTS      7       /* ip_opts; Set/get IP per-packet options.  */
#define IP_MULTICAST_IF 32	/* in_addr; set/get IP multicast i/f */
#define IP_MULTICAST_TTL 33	/* u_char; set/get IP multicast ttl */
#define IP_MULTICAST_LOOP 34	/* i_char; set/get IP multicast loopback */
#define IP_ADD_MEMBERSHIP 35	/* ip_mreq; add an IP group membership */
#define IP_DROP_MEMBERSHIP 36	/* ip_mreq; drop an IP group membership */
#define IP_UNBLOCK_SOURCE 37	/* ip_mreq_source: unblock data from source */
#define IP_BLOCK_SOURCE 38	/* ip_mreq_source: block data from source */
#define IP_ADD_SOURCE_MEMBERSHIP 39 /* ip_mreq_source: join source group */
#define IP_DROP_SOURCE_MEMBERSHIP 40 /* ip_mreq_source: leave source group */
#define IP_MSFILTER 41
#if defined __USE_MISC || defined __USE_GNU
# define MCAST_JOIN_GROUP 42	/* group_req: join any-source group */
# define MCAST_BLOCK_SOURCE 43	/* group_source_req: block from given group */
# define MCAST_UNBLOCK_SOURCE 44 /* group_source_req: unblock from given group*/
# define MCAST_LEAVE_GROUP 45	/* group_req: leave any-source group */
# define MCAST_JOIN_SOURCE_GROUP 46 /* group_source_req: join source-spec gr */
# define MCAST_LEAVE_SOURCE_GROUP 47 /* group_source_req: leave source-spec gr*/
# define MCAST_MSFILTER 48
# define IP_MULTICAST_ALL 49
# define IP_UNICAST_IF 50

# define MCAST_EXCLUDE   0
# define MCAST_INCLUDE   1
#endif

#define IP_ROUTER_ALERT	5	/* bool */
#define IP_PKTINFO	8	/* bool */
#define IP_PKTOPTIONS	9
#define IP_PMTUDISC	10	/* obsolete name? */
#define IP_MTU_DISCOVER	10	/* int; see below */
#define IP_RECVERR	11	/* bool */
#define IP_RECVTTL	12	/* bool */
#define IP_RECVTOS	13	/* bool */
#define IP_MTU		14	/* int */
#define IP_FREEBIND	15
#define IP_IPSEC_POLICY 16
#define IP_XFRM_POLICY	17
#define IP_PASSSEC	18
#define IP_TRANSPARENT	19
#define IP_MULTICAST_ALL 49	/* bool */

/* TProxy original addresses */
#define IP_ORIGDSTADDR       20
#define IP_RECVORIGDSTADDR   IP_ORIGDSTADDR

#define IP_MINTTL       21
#define IP_NODEFRAG     22
#define IP_CHECKSUM     23
#define IP_BIND_ADDRESS_NO_PORT 24

/* IP_MTU_DISCOVER arguments.  */
#define IP_PMTUDISC_DONT   0	/* Never send DF frames.  */
#define IP_PMTUDISC_WANT   1	/* Use per route hints.  */
#define IP_PMTUDISC_DO     2	/* Always DF.  */
#define IP_PMTUDISC_PROBE  3	/* Ignore dst pmtu.  */
/* Always use interface mtu (ignores dst pmtu) but don't set DF flag.
   Also incoming ICMP frag_needed notifications will be ignored on
   this socket to prevent accepting spoofed ones.  */
#define IP_PMTUDISC_INTERFACE           4
/* Like IP_PMTUDISC_INTERFACE but allow packets to be fragmented.  */
#define IP_PMTUDISC_OMIT		5

#define IP_MULTICAST_IF			32
#define IP_MULTICAST_TTL 		33
#define IP_MULTICAST_LOOP 		34
#define IP_ADD_MEMBERSHIP		35
#define IP_DROP_MEMBERSHIP		36
#define IP_UNBLOCK_SOURCE		37
#define IP_BLOCK_SOURCE			38
#define IP_ADD_SOURCE_MEMBERSHIP	39
#define IP_DROP_SOURCE_MEMBERSHIP	40
#define IP_MSFILTER			41
#define MCAST_JOIN_GROUP		42
#define MCAST_BLOCK_SOURCE		43
#define MCAST_UNBLOCK_SOURCE		44
#define MCAST_LEAVE_GROUP		45
#define MCAST_JOIN_SOURCE_GROUP		46
#define MCAST_LEAVE_SOURCE_GROUP	47
#define MCAST_MSFILTER			48
#define IP_MULTICAST_ALL		49
#define IP_UNICAST_IF			50

/* To select the IP level.  */
#define SOL_IP	0

#define IP_DEFAULT_MULTICAST_TTL        1
#define IP_DEFAULT_MULTICAST_LOOP       1
#define IP_MAX_MEMBERSHIPS              20

#if defined __USE_MISC || defined __USE_GNU
/* Structure used to describe IP options for IP_OPTIONS and IP_RETOPTS.
   The `ip_dst' field is used for the first-hop gateway when using a
   source route (this gets put into the header proper).  */
struct ip_opts
  {
    struct in_addr ip_dst;	/* First hop; zero without source route.  */
    char ip_opts[40];		/* Actually variable in size.  */
  };

/* Like `struct ip_mreq' but including interface specification by index.  */
struct ip_mreqn
  {
    struct in_addr imr_multiaddr;	/* IP multicast address of group */
    struct in_addr imr_address;		/* local IP address of interface */
    int	imr_ifindex;			/* Interface index */
  };

/* Structure used for IP_PKTINFO.  */
struct in_pktinfo
  {
    int ipi_ifindex;			/* Interface index  */
    struct in_addr ipi_spec_dst;	/* Routing destination address  */
    struct in_addr ipi_addr;		/* Header destination address  */
  };
#endif

/* Options for use with `getsockopt' and `setsockopt' at the IPv6 level.
   The first word in the comment at the right is the data type used;
   "bool" means a boolean value stored in an `int'.  */
#define IPV6_ADDRFORM		1
#define IPV6_2292PKTINFO	2
#define IPV6_2292HOPOPTS	3
#define IPV6_2292DSTOPTS	4
#define IPV6_2292RTHDR		5
#define IPV6_2292PKTOPTIONS	6
#define IPV6_CHECKSUM		7
#define IPV6_2292HOPLIMIT	8

#define SCM_SRCRT		IPV6_RXSRCRT

#define IPV6_NEXTHOP		9
#define IPV6_AUTHHDR		10
#define IPV6_UNICAST_HOPS	16
#define IPV6_MULTICAST_IF	17
#define IPV6_MULTICAST_HOPS	18
#define IPV6_MULTICAST_LOOP	19
#define IPV6_JOIN_GROUP		20
#define IPV6_LEAVE_GROUP	21
#define IPV6_ROUTER_ALERT	22
#define IPV6_MTU_DISCOVER	23
#define IPV6_MTU		24
#define IPV6_RECVERR		25
#define IPV6_V6ONLY		26
#define IPV6_JOIN_ANYCAST	27
#define IPV6_LEAVE_ANYCAST	28
#define IPV6_IPSEC_POLICY	34
#define IPV6_XFRM_POLICY	35

#define IPV6_RECVPKTINFO	49
#define IPV6_PKTINFO		50
#define IPV6_RECVHOPLIMIT	51
#define IPV6_HOPLIMIT		52
#define IPV6_RECVHOPOPTS	53
#define IPV6_HOPOPTS		54
#define IPV6_RTHDRDSTOPTS	55
#define IPV6_RECVRTHDR		56
#define IPV6_RTHDR		57
#define IPV6_RECVDSTOPTS	58
#define IPV6_DSTOPTS		59

#define IPV6_RECVTCLASS		66
#define IPV6_TCLASS		67

/* Obsolete synonyms for the above.  */
#if !__USE_KERNEL_IPV6_DEFS
# define IPV6_ADD_MEMBERSHIP	IPV6_JOIN_GROUP
# define IPV6_DROP_MEMBERSHIP	IPV6_LEAVE_GROUP
#endif
#define IPV6_RXHOPOPTS		IPV6_HOPOPTS
#define IPV6_RXDSTOPTS		IPV6_DSTOPTS

/* IPV6_MTU_DISCOVER values.  */
#define IPV6_PMTUDISC_DONT	0	/* Never send DF frames.  */
#define IPV6_PMTUDISC_WANT	1	/* Use per route hints.  */
#define IPV6_PMTUDISC_DO	2	/* Always DF.  */
#define IPV6_PMTUDISC_PROBE	3	/* Ignore dst pmtu.  */
#define IPV6_PMTUDISC_INTERFACE	4	/* See IP_PMTUDISC_INTERFACE.  */
#define IPV6_PMTUDISC_OMIT	5	/* See IP_PMTUDISC_OMIT.  */

/* Socket level values for IPv6.  */
#define SOL_IPV6        41
#define SOL_ICMPV6      58

/* Routing header options for IPv6.  */
#define IPV6_RTHDR_LOOSE	0	/* Hop doesn't need to be neighbour. */
#define IPV6_RTHDR_STRICT	1	/* Hop must be a neighbour.  */

#define IPV6_RTHDR_TYPE_0	0	/* IPv6 Routing header type 0.  */