Merge remote-tracking branch 'origin/master' into llvm10

1 files changed, 64 insertions, 2 deletions

diff --git a/lib/std/os/linux.zig b/lib/std/os/linux.zig
index 719e541846..ba7356d62c 100644
--- a/lib/std/os/linux.zig
+++ b/lib/std/os/linux.zig
@@ -350,7 +350,13 @@ pub fn pread(fd: i32, buf: [*]u8, count: usize, offset: u64) usize {
             );
         }
     } else {
-        return syscall4(SYS_pread, @bitCast(usize, @as(isize, fd)), @ptrToInt(buf), count, offset);
+        return syscall4(
+            SYS_pread,
+            @bitCast(usize, @as(isize, fd)),
+            @ptrToInt(buf),
+            count,
+            offset,
+        );
     }
 }
 
@@ -384,8 +390,64 @@ pub fn write(fd: i32, buf: [*]const u8, count: usize) usize {
     return syscall3(SYS_write, @bitCast(usize, @as(isize, fd)), @ptrToInt(buf), count);
 }
 
+pub fn ftruncate(fd: i32, length: u64) usize {
+    if (@hasDecl(@This(), "SYS_ftruncate64")) {
+        if (require_aligned_register_pair) {
+            return syscall4(
+                SYS_ftruncate64,
+                @bitCast(usize, @as(isize, fd)),
+                0,
+                @truncate(usize, length),
+                @truncate(usize, length >> 32),
+            );
+        } else {
+            return syscall3(
+                SYS_ftruncate64,
+                @bitCast(usize, @as(isize, fd)),
+                @truncate(usize, length),
+                @truncate(usize, length >> 32),
+            );
+        }
+    } else {
+        return syscall2(
+            SYS_ftruncate,
+            @bitCast(usize, @as(isize, fd)),
+            @truncate(usize, length),
+        );
+    }
+}
+
 pub fn pwrite(fd: i32, buf: [*]const u8, count: usize, offset: usize) usize {
-    return syscall4(SYS_pwrite, @bitCast(usize, @as(isize, fd)), @ptrToInt(buf), count, offset);
+    if (@hasDecl(@This(), "SYS_pwrite64")) {
+        if (require_aligned_register_pair) {
+            return syscall6(
+                SYS_pwrite64,
+                @bitCast(usize, @as(isize, fd)),
+                @ptrToInt(buf),
+                count,
+                0,
+                @truncate(usize, offset),
+                @truncate(usize, offset >> 32),
+            );
+        } else {
+            return syscall5(
+                SYS_pwrite64,
+                @bitCast(usize, @as(isize, fd)),
+                @ptrToInt(buf),
+                count,
+                @truncate(usize, offset),
+                @truncate(usize, offset >> 32),
+            );
+        }
+    } else {
+        return syscall4(
+            SYS_pwrite,
+            @bitCast(usize, @as(isize, fd)),
+            @ptrToInt(buf),
+            count,
+            offset,
+        );
+    }
 }
 
 pub fn rename(old: [*:0]const u8, new: [*:0]const u8) usize {