Merge pull request #4612 from ziglang/os-read-write-sendfile

std.os read/write functions + sendfile

1 files changed, 33 insertions, 2 deletions

diff --git a/lib/std/os/linux.zig b/lib/std/os/linux.zig
index 30dba85e51..c2fc06bc9b 100644
--- a/lib/std/os/linux.zig
+++ b/lib/std/os/linux.zig
@@ -316,8 +316,19 @@ pub fn symlinkat(existing: [*:0]const u8, newfd: i32, newpath: [*:0]const u8) us
     return syscall3(SYS_symlinkat, @ptrToInt(existing), @bitCast(usize, @as(isize, newfd)), @ptrToInt(newpath));
 }
 
-pub fn pread(fd: i32, buf: [*]u8, count: usize, offset: usize) usize {
-    return syscall4(SYS_pread, @bitCast(usize, @as(isize, fd)), @ptrToInt(buf), count, offset);
+pub fn pread(fd: i32, buf: [*]u8, count: usize, offset: u64) usize {
+    if (@hasDecl(@This(), "SYS_pread64")) {
+        return syscall5(
+            SYS_pread64,
+            @bitCast(usize, @as(isize, fd)),
+            @ptrToInt(buf),
+            count,
+            @truncate(usize, offset),
+            @truncate(usize, offset >> 32),
+        );
+    } else {
+        return syscall4(SYS_pread, @bitCast(usize, @as(isize, fd)), @ptrToInt(buf), count, offset);
+    }
 }
 
 pub fn access(path: [*:0]const u8, mode: u32) usize {
@@ -846,6 +857,26 @@ pub fn sendto(fd: i32, buf: [*]const u8, len: usize, flags: u32, addr: ?*const s
     return syscall6(SYS_sendto, @bitCast(usize, @as(isize, fd)), @ptrToInt(buf), len, flags, @ptrToInt(addr), @intCast(usize, alen));
 }
 
+pub fn sendfile(outfd: i32, infd: i32, offset: ?*i64, count: usize) usize {
+    if (@hasDecl(@This(), "SYS_sendfile64")) {
+        return syscall4(
+            SYS_sendfile64,
+            @bitCast(usize, @as(isize, outfd)),
+            @bitCast(usize, @as(isize, infd)),
+            @ptrToInt(offset),
+            count,
+        );
+    } else {
+        return syscall4(
+            SYS_sendfile,
+            @bitCast(usize, @as(isize, outfd)),
+            @bitCast(usize, @as(isize, infd)),
+            @ptrToInt(offset),
+            count,
+        );
+    }
+}
+
 pub fn socketpair(domain: i32, socket_type: i32, protocol: i32, fd: [2]i32) usize {
     if (builtin.arch == .i386) {
         return socketcall(SC_socketpair, &[4]usize{ @intCast(usize, domain), @intCast(usize, socket_type), @intCast(usize, protocol), @ptrToInt(&fd[0]) });