Add wasm32-wasip2 definitions necessary for std::net support

(backport <rust-lang#3892>)
(cherry picked from commit 78e7b89)

libc-test/build.rs

@@ -1521,6 +1521,7 @@ fn test_dragonflybsd(target: &str) {
 
 fn test_wasi(target: &str) {
     assert!(target.contains("wasi"));
+    let p2 = target.contains("wasip2");
 
     let mut cfg = ctest_cfg();
     cfg.define("_GNU_SOURCE", None);
@@ -1534,6 +1535,9 @@ fn test_wasi(target: &str) {
         "limits.h",
         "locale.h",
         "malloc.h",
+        [p2]: "netdb.h",
+        [p2]: "netinet/in.h",
+        [p2]: "netinet/tcp.h",
         "poll.h",
         "sched.h",
         "stdbool.h",
@@ -1565,6 +1569,12 @@ fn test_wasi(target: &str) {
     // to omit them.
     cfg.cfg("libc_ctest", None);
 
+    // `ctest2` has a hard-coded list of default cfgs which doesn't include
+    // wasip2, which is why it has to be set here manually.
+    if p2 {
+        cfg.cfg("target_env", Some("p2"));
+    }
+
     cfg.type_name(move |ty, is_struct, is_union| match ty {
         "FILE" | "fd_set" | "DIR" => ty.to_string(),
         t if is_union => format!("union {}", t),
@@ -1587,6 +1597,14 @@ fn test_wasi(target: &str) {
     // used here to generate a pointer to them in bindings so skip these tests.
     cfg.skip_static(|c| c.starts_with("_CLOCK_"));
 
+    cfg.skip_const(|c| match c {
+        // These constants aren't yet defined in wasi-libc.
+        // Exposing them is being tracked by https://github.com/WebAssembly/wasi-libc/issues/531.
+        "SO_BROADCAST" | "SO_LINGER" => true,
+
+        _ => false,
+    });
+
     cfg.skip_fn(|f| match f {
         // This function doesn't actually exist in libc's header files
         "__errno_location" => true,

libc-test/semver/wasi-p2.txt

@@ -0,0 +1,59 @@
+sa_family_t
+in_port_t
+in_addr_t
+socklen_t
+sockaddr
+in_addr
+sockaddr_in
+in6_addr
+sockaddr_in6
+sockaddr_storage
+addrinfo
+ip_mreq
+ipv6_mreq
+SHUT_RD
+SHUT_WR
+SHUT_RDWR
+MSG_NOSIGNAL
+MSG_PEEK
+SO_REUSEADDR
+SO_ERROR
+SO_BROADCAST
+SO_LINGER
+SO_RCVTIMEO
+SO_SNDTIMEO
+SOCK_DGRAM
+SOCK_STREAM
+SOL_SOCKET
+AF_INET
+AF_INET6
+IPPROTO_IP
+IPPROTO_TCP
+IPPROTO_IPV6
+IP_TTL
+IP_MULTICAST_TTL
+IP_MULTICAST_LOOP
+IP_ADD_MEMBERSHIP
+IP_DROP_MEMBERSHIP
+IPV6_MULTICAST_LOOP
+IPV6_JOIN_GROUP
+IPV6_LEAVE_GROUP
+IPV6_V6ONLY
+IPV6_ADD_MEMBERSHIP
+IPV6_DROP_MEMBERSHIP
+TCP_NODELAY
+EAI_SYSTEM
+socket
+connect
+bind
+listen
+accept
+getsockname
+getpeername
+sendto
+recvfrom
+getsockopt
+setsockopt
+getaddrinfo
+freeaddrinfo
+gai_strerror

src/wasi.rs → src/wasi/mod.rs

@@ -879,3 +879,10 @@ extern "C" {
 
     pub fn __errno_location() -> *mut ::c_int;
 }
+
+cfg_if! {
+    if #[cfg(target_env = "p2")] {
+        mod p2;
+        pub use self::p2::*;
+    }
+}

src/wasi/p2.rs

@@ -0,0 +1,161 @@
+pub type sa_family_t = ::c_ushort;
+pub type in_port_t = ::c_ushort;
+pub type in_addr_t = ::c_uint;
+
+pub type socklen_t = ::c_uint;
+
+s! {
+    #[repr(align(16))]
+    pub struct sockaddr {
+        pub sa_family: sa_family_t,
+        pub sa_data: [::c_char; 0],
+    }
+
+    pub struct in_addr {
+        pub s_addr: in_addr_t,
+    }
+
+    #[repr(align(16))]
+    pub struct sockaddr_in {
+        pub sin_family: sa_family_t,
+        pub sin_port: in_port_t,
+        pub sin_addr: in_addr,
+    }
+
+    #[repr(align(4))]
+    pub struct in6_addr {
+        pub s6_addr: [::c_uchar; 16],
+    }
+
+    #[repr(align(16))]
+    pub struct sockaddr_in6 {
+        pub sin6_family: sa_family_t,
+        pub sin6_port: in_port_t,
+        pub sin6_flowinfo: ::c_uint,
+        pub sin6_addr: in6_addr,
+        pub sin6_scope_id: ::c_uint,
+    }
+
+    #[repr(align(16))]
+    pub struct sockaddr_storage {
+        pub ss_family: sa_family_t,
+        pub __ss_data: [::c_char; 32],
+    }
+
+    pub struct addrinfo {
+        pub ai_flags: ::c_int,
+        pub ai_family: ::c_int,
+        pub ai_socktype: ::c_int,
+        pub ai_protocol: ::c_int,
+        pub ai_addrlen: socklen_t,
+        pub ai_addr: *mut sockaddr,
+        pub ai_canonname: *mut ::c_char,
+        pub ai_next: *mut addrinfo,
+    }
+
+    pub struct ip_mreq {
+        pub imr_multiaddr: in_addr,
+        pub imr_interface: in_addr,
+    }
+
+    pub struct ipv6_mreq {
+        pub ipv6mr_multiaddr: in6_addr,
+        pub ipv6mr_interface: ::c_uint,
+    }
+}
+
+pub const SHUT_RD: ::c_int = 1 << 0;
+pub const SHUT_WR: ::c_int = 1 << 1;
+pub const SHUT_RDWR: ::c_int = SHUT_RD | SHUT_WR;
+
+pub const MSG_NOSIGNAL: ::c_int = 0x4000;
+pub const MSG_PEEK: ::c_int = 0x0002;
+
+pub const SO_REUSEADDR: ::c_int = 2;
+pub const SO_ERROR: ::c_int = 4;
+pub const SO_BROADCAST: ::c_int = 6;
+pub const SO_LINGER: ::c_int = 13;
+pub const SO_RCVTIMEO: ::c_int = 66;
+pub const SO_SNDTIMEO: ::c_int = 67;
+
+pub const SOCK_DGRAM: ::c_int = 5;
+pub const SOCK_STREAM: ::c_int = 6;
+
+pub const SOL_SOCKET: ::c_int = 0x7fffffff;
+
+pub const AF_INET: ::c_int = 1;
+pub const AF_INET6: ::c_int = 2;
+
+pub const IPPROTO_IP: ::c_int = 0;
+pub const IPPROTO_TCP: ::c_int = 6;
+pub const IPPROTO_IPV6: ::c_int = 41;
+
+pub const IP_TTL: ::c_int = 2;
+pub const IP_MULTICAST_TTL: ::c_int = 33;
+pub const IP_MULTICAST_LOOP: ::c_int = 34;
+pub const IP_ADD_MEMBERSHIP: ::c_int = 35;
+pub const IP_DROP_MEMBERSHIP: ::c_int = 36;
+
+pub const IPV6_MULTICAST_LOOP: ::c_int = 19;
+pub const IPV6_JOIN_GROUP: ::c_int = 20;
+pub const IPV6_LEAVE_GROUP: ::c_int = 21;
+pub const IPV6_V6ONLY: ::c_int = 26;
+
+pub const IPV6_ADD_MEMBERSHIP: ::c_int = IPV6_JOIN_GROUP;
+pub const IPV6_DROP_MEMBERSHIP: ::c_int = IPV6_LEAVE_GROUP;
+
+pub const TCP_NODELAY: ::c_int = 1;
+
+pub const EAI_SYSTEM: ::c_int = -11;
+
+extern "C" {
+    pub fn socket(domain: ::c_int, type_: ::c_int, protocol: ::c_int) -> ::c_int;
+    pub fn connect(fd: ::c_int, name: *const sockaddr, addrlen: socklen_t) -> ::c_int;
+    pub fn bind(socket: ::c_int, addr: *const sockaddr, addrlen: socklen_t) -> ::c_int;
+    pub fn listen(socket: ::c_int, backlog: ::c_int) -> ::c_int;
+    pub fn accept(socket: ::c_int, addr: *mut sockaddr, addrlen: *mut socklen_t) -> ::c_int;
+
+    pub fn getsockname(socket: ::c_int, addr: *mut sockaddr, addrlen: *mut socklen_t) -> ::c_int;
+    pub fn getpeername(socket: ::c_int, addr: *mut sockaddr, addrlen: *mut socklen_t) -> ::c_int;
+
+    pub fn sendto(
+        socket: ::c_int,
+        buffer: *const ::c_void,
+        length: ::size_t,
+        flags: ::c_int,
+        addr: *const sockaddr,
+        addrlen: socklen_t,
+    ) -> ::ssize_t;
+    pub fn recvfrom(
+        socket: ::c_int,
+        buffer: *mut ::c_void,
+        length: ::size_t,
+        flags: ::c_int,
+        addr: *mut sockaddr,
+        addrlen: *mut socklen_t,
+    ) -> ::ssize_t;
+
+    pub fn getsockopt(
+        sockfd: ::c_int,
+        level: ::c_int,
+        optname: ::c_int,
+        optval: *mut ::c_void,
+        optlen: *mut socklen_t,
+    ) -> ::c_int;
+    pub fn setsockopt(
+        sockfd: ::c_int,
+        level: ::c_int,
+        optname: ::c_int,
+        optval: *const ::c_void,
+        optlen: socklen_t,
+    ) -> ::c_int;
+
+    pub fn getaddrinfo(
+        host: *const ::c_char,
+        serv: *const ::c_char,
+        hint: *const addrinfo,
+        res: *mut *mut addrinfo,
+    ) -> ::c_int;
+    pub fn freeaddrinfo(p: *mut addrinfo);
+    pub fn gai_strerror(ecode: ::c_int) -> *const ::c_char;
+}