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9.65 sys/socket.h

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html

Gnulib module: sys_socket

Portability problems fixed by Gnulib:

• This header file is missing on some platforms: mingw, MSVC 14.
• This header file is not self-contained on some platforms: it requires <sys/types.h> to be included first.
• This header file does not define the type struct iovec on some platforms: OpenBSD 4.4.
• This header file is lacking the SHUT_RD, SHUT_WR, SHUT_RDWR macros on some platforms, despite having the shutdown functions: emx+gcc.
• The struct sockaddr_storage type does not have a member ss_family on some platforms: AIX 7.1.
• The CMSG_SPACE and CMSG_LEN macros are not provided on some platforms: OpenVMS.
• This header file does not define the SO_REUSEPORT macro on some platforms: Minix 3.1.8, Solaris 10, Cygwin, mingw, MSVC 14.

Portability problems not fixed by Gnulib:

• This header file does not declare the msg_control and msg_controllen members of struct msghdr on some platforms. This can be detected by the absence of the CMSG_FIRSTHDR macro: gnulib replacement header, old BSD