Add support for SO_NOSIGPIPE on targeted OSes (#533)

* Add SO_NOSIGPIPE

* NetBSD doesn't support it yet, actually

Author: notgull

src/backend/libc/net/syscalls.rs

@@ -636,6 +636,30 @@ pub(crate) mod sockopt {
         }
     }
 
+    #[cfg(any(
+        target_os = "freebsd",
+        target_os = "macos",
+        target_os = "ios",
+        target_os = "tvos",
+        target_os = "watchos"
+    ))]
+    #[inline]
+    pub(crate) fn getsockopt_nosigpipe(fd: BorrowedFd<'_>) -> io::Result<bool> {
+        getsockopt(fd, c::SOL_SOCKET, c::SO_NOSIGPIPE).map(to_bool)
+    }
+
+    #[cfg(any(
+        target_os = "freebsd",
+        target_os = "macos",
+        target_os = "ios",
+        target_os = "tvos",
+        target_os = "watchos"
+    ))]
+    #[inline]
+    pub(crate) fn setsockopt_nosigpipe(fd: BorrowedFd<'_>, val: bool) -> io::Result<()> {
+        setsockopt(fd, c::SOL_SOCKET, c::SO_NOSIGPIPE, from_bool(val))
+    }
+
     #[inline]
     pub(crate) fn set_ip_ttl(fd: BorrowedFd<'_>, ttl: u32) -> io::Result<()> {
         setsockopt(fd, c::IPPROTO_IP as _, c::IP_TTL, ttl)

src/net/sockopt.rs

@@ -642,3 +642,61 @@ pub fn set_tcp_nodelay<Fd: AsFd>(fd: Fd, nodelay: bool) -> io::Result<()> {
 pub fn get_tcp_nodelay<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
     backend::net::syscalls::sockopt::get_tcp_nodelay(fd.as_fd())
 }
+
+/// `getsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE)`
+///
+/// # References
+///  - [POSIX `getsockopt`]
+///  - [POSIX `netinet/tcp.h`]
+///  - [Linux `getsockopt`]
+///  - [Linux `tcp`]
+///  - [Winsock2 `getsockopt`]
+///  - [Winsock2 `IPPROTO_TCP` options]
+///
+/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
+/// [POSIX `netinet/tcp.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_tcp.h.html
+/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
+/// [Linux `tcp`]: https://man7.org/linux/man-pages/man7/tcp.7.html
+/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
+/// [Winsock2 `IPPROTO_TCP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-tcp-socket-options
+#[cfg(any(
+    target_os = "freebsd",
+    target_os = "macos",
+    target_os = "ios",
+    target_os = "tvos",
+    target_os = "watchos"
+))]
+#[doc(alias = "SO_NOSIGPIPE")]
+#[inline]
+pub fn getsockopt_nosigpipe<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::syscalls::sockopt::getsockopt_nosigpipe(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, val)`
+///
+/// # References
+///  - [POSIX `getsockopt`]
+///  - [POSIX `netinet/tcp.h`]
+///  - [Linux `getsockopt`]
+///  - [Linux `tcp`]
+///  - [Winsock2 `getsockopt`]
+///  - [Winsock2 `IPPROTO_TCP` options]
+///
+/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
+/// [POSIX `netinet/tcp.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_tcp.h.html
+/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
+/// [Linux `tcp`]: https://man7.org/linux/man-pages/man7/tcp.7.html
+/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
+/// [Winsock2 `IPPROTO_TCP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-tcp-socket-options
+#[cfg(any(
+    target_os = "freebsd",
+    target_os = "macos",
+    target_os = "ios",
+    target_os = "tvos",
+    target_os = "watchos"
+))]
+#[doc(alias = "SO_NOSIGPIPE")]
+#[inline]
+pub fn setsockopt_nosigpipe<Fd: AsFd>(fd: Fd, val: bool) -> io::Result<()> {
+    backend::net::syscalls::sockopt::setsockopt_nosigpipe(fd.as_fd(), val)
+}