Fix GH-7978: sockets extension compilation errors

We fix the `ucred` detection when custom `CFLAGS` are in use.

Closes GH-7981.

socket: ancillary credentials build fix for non linux systems.

for systems using SO_PASSCRED sockopt flag but not using ucred struct.

Remove unused MISSING_MSGHDR_MSGFLAGS

Closes GH-4426

Remove unused check for struct cmsghdr

The result of this check is to whether to define the HAVE_CMSGHDR symbol
or not. The HAVE_CMSGHDR is never used in the code and it has been
rem

Remove unused check for struct cmsghdr

The result of this check is to whether to define the HAVE_CMSGHDR symbol
or not. The HAVE_CMSGHDR is never used in the code and it has been
removed via 90289924c031c5b0b2aa1f99ecf317640c926a62.

Closes GH-4337

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Sync functions checks

Removed unused checks:
- mbsinit check removed, HAVE_MBSINIT removed (not used in php-src)
- mempcpy check removed, HAVE_MEMPCPY removed (not used in php-src an

Sync functions checks

Removed unused checks:
- mbsinit check removed, HAVE_MBSINIT removed (not used in php-src)
- mempcpy check removed, HAVE_MEMPCPY removed (not used in php-src anymore since
560ed89bfbb56526251e9bd2fbcb27e5932641d8 which uses PHP's own implementation)
- strpncpy check removed, added via a8c9e893b6911c785f698d724b2ff61e7aebb737 and
not used.
- setpgid check removed since HAVE_SETPGID is not used

Moved to a central configure.ac:
- fpclass
- mbrlen moved to configure.ac (since the HAVE_MBRLEN is used accross the php-src)
- sigprocmask
- getcwd
- getwd
- glob
- strfmon
- nice

Duplicated checks removed:
- gethostname
- getlogin
- getpwuid_r
- socketpair

- mprotect check simplified

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Clean headers checks

Some headers were checked multiple times in the main configure.ac file
and in the bundled extensions or SAPIs themselves. Also many of these
checks are then used

Clean headers checks

Some headers were checked multiple times in the main configure.ac file
and in the bundled extensions or SAPIs themselves. Also many of these
checks are then used accross other extensions or SAPIs so a central
configure.ac makes most sense for these checks.

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Normalize comments in *nix build system m4 files

Normalization include:
- Use dnl for everything that can be ommitted when configure is built in
favor of the shell comment characte

Normalize comments in *nix build system m4 files

Normalization include:
- Use dnl for everything that can be ommitted when configure is built in
favor of the shell comment character # which is visible in the output.
- Line length normalized to 80 columns
- Dots for most of the one line sentences
- Macro definitions include similar pattern header comments now

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Add AS_HELP_STRING to *nix build configure options

The Autoconf's default AS_HELP_STRING macro can properly format help
strings [1] so watching out if columns are aligned manually is not

Add AS_HELP_STRING to *nix build configure options

The Autoconf's default AS_HELP_STRING macro can properly format help
strings [1] so watching out if columns are aligned manually is not
anymore.

[1] https://www.gnu.org/software/autoconf/manual/autoconf.html#Pretty-Help-Strings

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Define __APPLE_USE_RFC_3542 for new ipv6 constants

Remove not needed checking for <errno.h>

Header `<errno.h>` is part of the standard C89 headers [1] and on
current systems checking is not need anymore since PHP requires at
least C8

Remove not needed checking for <errno.h>

Header `<errno.h>` is part of the standard C89 headers [1] and on
current systems checking is not need anymore since PHP requires at
least C89. This is noted also by Autoconf itself in the docs and
code [2].

The Autoconf check defined the `HAVE_ERRNO_H` symbol when building PHP
with sockets extension or fpm sapi. This symbol is not utilized across
the PHP source code except in the current version of bundled GD library
which has worked ok so far also with sockets extension or fpm sapi
disabled anyway.

Refs:
[1] https://port70.net/~nsz/c/c89/c89-draft.html#4.1.2
[2] https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/headers.m4

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Replace obsolete AC_TRY_FOO with AC_FOO_IFELSE

Autoconf 2.50 released in 2001 made several macros obsolete including
the AC_TRY_RUN, AC_TRY_COMPILE and AC_TRY_LINK:
http://git.savann

Replace obsolete AC_TRY_FOO with AC_FOO_IFELSE

Autoconf 2.50 released in 2001 made several macros obsolete including
the AC_TRY_RUN, AC_TRY_COMPILE and AC_TRY_LINK:
http://git.savannah.gnu.org/cgit/autoconf.git/tree/ChangeLog.2

These macros should be replaced with the current AC_FOO_IFELSE instead:
- AC_TRY_RUN with AC_RUN_IFELSE and AC_LANG_SOURCE
- AC_TRY_LINK with AC_LINK_IFELSE and AC_LANG_PROGRAM
- AC_TRY_COMPILE with AC_COMPILE_IFELSE and AC_LANG_PROGRAM

PHP 5.4 to 7.1 require Autoconf 2.59+ version, PHP 7.2 and above require
2.64+ version, and the PHP 7.2 phpize script requires 2.59+ version which
are all greater than above mentioned 2.50 version therefore systems
should be well supported by now.

This patch was created with the help of autoupdate script:
autoupdate <file>

Reference docs:
- https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Obsolete-Macros.html
- https://www.gnu.org/software/autoconf/manual/autoconf-2.59/autoconf.pdf

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Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
use

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.

In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.

This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.

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ext/sockets: make AI_IDN usage optional

AI_IDN is not supported by all C libraries (uClibc, musl), so make it
optional, like AI_ALL.

Signed-off-by: Thomas Petazzoni <thomas.peta

ext/sockets: make AI_IDN usage optional

AI_IDN is not supported by all C libraries (uClibc, musl), so make it
optional, like AI_ALL.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

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Fix openbsd build: AI_V4MAPPED, AI_ALL not defined

convert ext/sockets to work with the static tsrm cache pointer

- Fixed bug #65923 (ext/socket assumes AI_V4MAPPED is defined)

Refactoring: move stuff to new conversions.c

Wrap recvmsg() and sendmsg()

This introduces two new functions:

int socket_recvmsg(resource $socket, array &$msghdr, int $flags)
int socket_sendmsg(resource $socket, array $msgh

Wrap recvmsg() and sendmsg()

This introduces two new functions:

int socket_recvmsg(resource $socket, array &$msghdr, int $flags)
int socket_sendmsg(resource $socket, array $msghdr, int $flags)

The arrays representing struct msghdr follow the native counterpart
closely: structs are mapped to arrays, fields to array elements whose
key is the name of the field without the prefix (e.g. "name" instead
of "msg_name") and array are mapped to sequential numeric PHP arrays.

Right now the only type of ancillary data supported is fot the
level/type pair IPPROTO_IPV6/IPV6_PKTINFO.

I also refactored out the name resolution functions and made
sockets_strerror() a global function.

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- Fixed bug #62025 (__ss_family was changed on AIX 5.3)

- Fixed build on Solaris.

- Added multicast support to the sockets extension (bug #40510).

Share the php_sockets.h header
Share php_sockets_le_socket_name

- Test properly for socketpair inside an extension.

NetWare LibC don't have socketpair function. So enabling socket_create_pair functionality only if socketpair is available in the host LibC.
--Kamesh

Make php_set_inet6_addr happy with any environment. Use getaddrinfo() if available, gethostbyname2() if not, and simply fail if neither is present.