Auto merge of #2293 - devnexen:system_prop_api_android, r=JohnTitor

android system prop api update.

Author: bors

libc-test/build.rs

@@ -1598,6 +1598,8 @@ fn test_android(target: &str) {
             "termios2" => true,
             // uc_sigmask and uc_sigmask64 of ucontext_t are an anonymous union
             "ucontext_t" => true,
+            // 'private' type
+            "prop_info" => true,
 
             _ => false,
         }
@@ -1647,6 +1649,7 @@ fn test_android(target: &str) {
             // test the XSI version below.
             "strerror_r" => true,
             "reallocarray" => true,
+            "__system_property_wait" => true,
 
             _ => false,
         }

libc-test/semver/android-aarch64.txt

@@ -10,3 +10,4 @@ HWCAP2_SVESM4
 SYS_arch_specific_syscall
 SYS_syscalls
 SYS_fcntl
+__system_property_wait

libc-test/semver/android.txt

@@ -1621,6 +1621,8 @@ PRIO_PGRP
 PRIO_PROCESS
 PRIO_USER
 PROC_SUPER_MAGIC
+PROP_NAME_MAX
+PROP_VALUE_MAX
 PROT_EXEC
 PROT_GROWSDOWN
 PROT_GROWSUP
@@ -2562,6 +2564,11 @@ __kernel_pid_t
 __sched_cpualloc
 __sched_cpucount
 __sched_cpufree
+__system_property_find
+__system_property_find_nth
+__system_property_foreach
+__system_property_get
+__system_property_set
 _exit
 abort
 accept
@@ -2939,6 +2946,7 @@ prlimit
 prlimit64
 process_vm_readv
 process_vm_writev
+prop_info
 protoent
 pselect
 pthread_atfork

src/unix/linux_like/android/b64/mod.rs

@@ -331,6 +331,12 @@ f! {
 
 extern "C" {
     pub fn getauxval(type_: ::c_ulong) -> ::c_ulong;
+    pub fn __system_property_wait(
+        pi: *const ::prop_info,
+        __old_serial: u32,
+        __new_serial_ptr: *mut u32,
+        __relative_timeout: *const ::timespec,
+    ) -> bool;
 }
 
 cfg_if! {

src/unix/linux_like/android/mod.rs

@@ -422,6 +422,12 @@ s_no_extra_traits! {
         pub ivlen: u32,
         pub iv: [::c_uchar; 0],
     }
+
+    pub struct prop_info {
+        __name: [::c_char; 32],
+        __serial: ::c_uint,
+        __value: [[::c_char; 4]; 23],
+    }
 }
 
 cfg_if! {
@@ -740,6 +746,24 @@ cfg_if! {
                 self.as_slice().hash(state);
             }
         }
+
+        impl PartialEq for prop_info {
+            fn eq(&self, other: &prop_info) -> bool {
+                self.__name == other.__name &&
+                    self.__serial == other.__serial &&
+                    self.__value == other.__value
+            }
+        }
+        impl Eq for prop_info {}
+        impl ::fmt::Debug for prop_info {
+            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
+                f.debug_struct("prop_info")
+                    .field("__name", &self.__name)
+                    .field("__serial", &self.__serial)
+                    .field("__value", &self.__value)
+                    .finish()
+            }
+        }
     }
 }
 
@@ -2412,6 +2436,7 @@ pub const PF_VSOCK: ::c_int = AF_VSOCK;
 
 // sys/system_properties.h
 pub const PROP_VALUE_MAX: ::c_int = 92;
+pub const PROP_NAME_MAX: ::c_int = 32;
 
 f! {
     pub fn CMSG_NXTHDR(mhdr: *const msghdr,
@@ -2864,6 +2889,12 @@ extern "C" {
 
     pub fn __system_property_set(__name: *const ::c_char, __value: *const ::c_char) -> ::c_int;
     pub fn __system_property_get(__name: *const ::c_char, __value: *mut ::c_char) -> ::c_int;
+    pub fn __system_property_find(__name: *const ::c_char) -> *const prop_info;
+    pub fn __system_property_find_nth(__n: ::c_uint) -> *const prop_info;
+    pub fn __system_property_foreach(
+        __callback: unsafe extern "C" fn(__pi: *const prop_info, __cookie: *mut ::c_void),
+        __cookie: *mut ::c_void,
+    ) -> ::c_int;
 
     // #include <link.h>
     /// Only available in API Version 21+