Change getdtablesize() to sysconf(_SC_OPEN_MAX) only for aarch64-android

Author: ejjeong

src/liblibc/lib.rs

@@ -4827,6 +4827,7 @@ pub mod funcs {
                                    mibp: *mut c_int,
                                    sizep: *mut size_t)
                                    -> c_int;
+            pub fn getdtablesize() -> c_int;
             pub fn madvise(addr: *mut c_void, len: size_t, advice: c_int)
                            -> c_int;
             pub fn mincore(addr: *mut c_void, len: size_t, vec: *mut c_uchar)
@@ -4841,6 +4842,8 @@ pub mod funcs {
         use types::os::arch::c95::{c_uchar, c_int, size_t};
 
         extern {
+            #[cfg(not(all(target_os = "android", target_arch = "aarch64")))]
+            pub fn getdtablesize() -> c_int;
             pub fn ioctl(d: c_int, request: c_int, ...) -> c_int;
             pub fn madvise(addr: *mut c_void, len: size_t, advice: c_int)
                            -> c_int;

src/libstd/sys/unix/process.rs

@@ -82,6 +82,14 @@ impl Process {
             extern { static mut environ: *const c_void; }
             environ = envp;
         }
+        #[cfg(all(target_os = "android", target_arch = "aarch64"))]
+        unsafe fn getdtablesize() -> c_int {
+            libc::sysconf(libc::consts::os::sysconf::_SC_OPEN_MAX) as c_int
+        }
+        #[cfg(not(all(target_os = "android", target_arch = "aarch64")))]
+        unsafe fn getdtablesize() -> c_int {
+            libc::funcs::bsd44::getdtablesize()
+        }
 
         unsafe fn set_cloexec(fd: c_int) {
             let ret = c::ioctl(fd, c::FIOCLEX);
@@ -223,8 +231,7 @@ impl Process {
                 if !setup(err_fd, libc::STDERR_FILENO) { fail(&mut output) }
 
                 // close all other fds
-                let open_max = libc::sysconf(libc::consts::os::sysconf::_SC_OPEN_MAX);
-                for fd in (3..open_max).rev() {
+                for fd in (3..getdtablesize()).rev() {
                     if fd != output.fd() {
                         let _ = close(fd as c_int);
                     }