Merge remote-tracking branch 'origin/master' into stage2-whole-file-astgen

In particular I wanted the change that makes `suspend;` illegal in the
parser.

lib/std/os/linux.zig

@@ -53,6 +53,7 @@ pub fn getauxval(index: usize) usize {
 // Some architectures (and some syscalls) require 64bit parameters to be passed
 // in a even-aligned register pair.
 const require_aligned_register_pair =
+    std.Target.current.cpu.arch.isPPC() or
     std.Target.current.cpu.arch.isMIPS() or
     std.Target.current.cpu.arch.isARM() or
     std.Target.current.cpu.arch.isThumb();
@@ -633,7 +634,7 @@ pub fn tkill(tid: pid_t, sig: i32) usize {
 }
 
 pub fn tgkill(tgid: pid_t, tid: pid_t, sig: i32) usize {
-    return syscall2(.tgkill, @bitCast(usize, @as(isize, tgid)), @bitCast(usize, @as(isize, tid)), @bitCast(usize, @as(isize, sig)));
+    return syscall3(.tgkill, @bitCast(usize, @as(isize, tgid)), @bitCast(usize, @as(isize, tid)), @bitCast(usize, @as(isize, sig)));
 }
 
 pub fn link(oldpath: [*:0]const u8, newpath: [*:0]const u8, flags: i32) usize {
@@ -1386,6 +1387,53 @@ pub fn madvise(address: [*]u8, len: usize, advice: u32) usize {
     return syscall3(.madvise, @ptrToInt(address), len, advice);
 }
 
+pub fn pidfd_open(pid: pid_t, flags: u32) usize {
+    return syscall2(.pidfd_open, @bitCast(usize, @as(isize, pid)), flags);
+}
+
+pub fn pidfd_getfd(pidfd: fd_t, targetfd: fd_t, flags: u32) usize {
+    return syscall3(
+        .pidfd_getfd,
+        @bitCast(usize, @as(isize, pidfd)),
+        @bitCast(usize, @as(isize, targetfd)),
+        flags,
+    );
+}
+
+pub fn pidfd_send_signal(pidfd: fd_t, sig: i32, info: ?*siginfo_t, flags: u32) usize {
+    return syscall4(
+        .pidfd_send_signal,
+        @bitCast(usize, @as(isize, pidfd)),
+        @bitCast(usize, @as(isize, sig)),
+        @ptrToInt(info),
+        flags,
+    );
+}
+
+pub fn process_vm_readv(pid: pid_t, local: [*]const iovec, local_count: usize, remote: [*]const iovec, remote_count: usize, flags: usize) usize {
+    return syscall6(
+        .process_vm_readv,
+        @bitCast(usize, @as(isize, pid)),
+        @ptrToInt(local),
+        local_count,
+        @ptrToInt(remote),
+        remote_count,
+        flags,
+    );
+}
+
+pub fn process_vm_writev(pid: pid_t, local: [*]const iovec, local_count: usize, remote: [*]const iovec, remote_count: usize, flags: usize) usize {
+    return syscall6(
+        .process_vm_writev,
+        @bitCast(usize, @as(isize, pid)),
+        @ptrToInt(local),
+        local_count,
+        @ptrToInt(remote),
+        remote_count,
+        flags,
+    );
+}
+
 test {
     if (std.Target.current.os.tag == .linux) {
         _ = @import("linux/test.zig");