Auto merge of #2525 - qwandor:mlock2, r=Amanieu

Add mlock2 on Android and Linux.

Unfortunately the type of the flags parameter is different between Bionic and glibc for some reason.

Author: bors

libc-test/build.rs

@@ -1702,6 +1702,9 @@ fn test_android(target: &str) {
             "reallocarray" => true,
             "__system_property_wait" => true,
 
+            // Added in API level 30, but tests use level 28.
+            "mlock2" => true,
+
             _ => false,
         }
     });

src/unix/linux_like/android/mod.rs

@@ -2328,6 +2328,9 @@ pub const ALG_SET_AEAD_AUTHSIZE: ::c_int = 5;
 pub const ALG_OP_DECRYPT: ::c_int = 0;
 pub const ALG_OP_ENCRYPT: ::c_int = 1;
 
+// sys/mman.h
+pub const MLOCK_ONFAULT: ::c_int = 0x01;
+
 // uapi/linux/vm_sockets.h
 pub const VMADDR_CID_ANY: ::c_uint = 0xFFFFFFFF;
 pub const VMADDR_CID_HYPERVISOR: ::c_uint = 0;
@@ -2582,6 +2585,7 @@ extern "C" {
     pub fn strerror_r(errnum: ::c_int, buf: *mut c_char, buflen: ::size_t) -> ::c_int;
 
     pub fn gettimeofday(tp: *mut ::timeval, tz: *mut ::timezone) -> ::c_int;
+    pub fn mlock2(addr: *const ::c_void, len: ::size_t, flags: ::c_int) -> ::c_int;
     pub fn madvise(addr: *mut ::c_void, len: ::size_t, advice: ::c_int) -> ::c_int;
     pub fn ioctl(fd: ::c_int, request: ::c_int, ...) -> ::c_int;
     pub fn msync(addr: *mut ::c_void, len: ::size_t, flags: ::c_int) -> ::c_int;

src/unix/linux_like/linux/mod.rs

@@ -2583,6 +2583,7 @@ pub const MAP_SHARED_VALIDATE: ::c_int = 0x3;
 
 // include/uapi/asm-generic/mman-common.h
 pub const MAP_FIXED_NOREPLACE: ::c_int = 0x100000;
+pub const MLOCK_ONFAULT: ::c_uint = 0x01;
 
 // uapi/linux/vm_sockets.h
 pub const VMADDR_CID_ANY: ::c_uint = 0xFFFFFFFF;
@@ -3533,6 +3534,7 @@ extern "C" {
     pub fn seekdir(dirp: *mut ::DIR, loc: ::c_long);
 
     pub fn telldir(dirp: *mut ::DIR) -> ::c_long;
+    pub fn mlock2(addr: *const ::c_void, len: ::size_t, flags: ::c_uint) -> ::c_int;
     pub fn madvise(addr: *mut ::c_void, len: ::size_t, advice: ::c_int) -> ::c_int;
 
     pub fn msync(addr: *mut ::c_void, len: ::size_t, flags: ::c_int) -> ::c_int;