Auto merge of #1399 - josephlr:getrandom, r=gnzlbg

Add getrandom() bindings on Linux

Closes #659

Author: bors

src/unix/linux_like/linux/gnu/mod.rs

@@ -967,6 +967,11 @@ extern {
                         tz: *mut ::timezone) -> ::c_int;
     pub fn statx(dirfd: ::c_int, pathname: *const c_char, flags: ::c_int,
                  mask: ::c_uint, statxbuf: *mut statx) -> ::c_int;
+    pub fn getrandom(
+        buf: *mut ::c_void,
+        buflen: ::size_t,
+        flags: ::c_uint,
+    ) -> ::ssize_t;
 }
 
 #[link(name = "util")]

src/unix/linux_like/linux/musl/b32/arm.rs

@@ -843,3 +843,11 @@ pub const AF_MAX: ::c_int = 45;
             https://github.com/rust-lang/libc/issues/665"
 )]
 pub const PF_MAX: ::c_int = AF_MAX;
+
+extern {
+    pub fn getrandom(
+        buf: *mut ::c_void,
+        buflen: ::size_t,
+        flags: ::c_uint,
+    ) -> ::ssize_t;
+}

src/unix/linux_like/linux/musl/b32/powerpc.rs

@@ -869,3 +869,11 @@ pub const AF_MAX: ::c_int = 43;
             https://github.com/rust-lang/libc/issues/665"
 )]
 pub const PF_MAX: ::c_int = AF_MAX;
+
+extern {
+    pub fn getrandom(
+        buf: *mut ::c_void,
+        buflen: ::size_t,
+        flags: ::c_uint,
+    ) -> ::ssize_t;
+}

src/unix/linux_like/linux/musl/b32/x86.rs

@@ -951,3 +951,11 @@ pub const AF_MAX: ::c_int = 45;
             https://github.com/rust-lang/libc/issues/665"
 )]
 pub const PF_MAX: ::c_int = AF_MAX;
+
+extern {
+    pub fn getrandom(
+        buf: *mut ::c_void,
+        buflen: ::size_t,
+        flags: ::c_uint,
+    ) -> ::ssize_t;
+}

src/unix/linux_like/linux/musl/b64/mod.rs

@@ -312,6 +312,14 @@ pub const VEOF: usize = 4;
 pub const POLLWRNORM: ::c_short = 0x100;
 pub const POLLWRBAND: ::c_short = 0x200;
 
+extern {
+    pub fn getrandom(
+        buf: *mut ::c_void,
+        buflen: ::size_t,
+        flags: ::c_uint,
+    ) -> ::ssize_t;
+}
+
 cfg_if! {
     if #[cfg(target_arch = "aarch64")] {
         mod aarch64;