Commit 54229fec33

@@ -103,7 +103,7 @@ pub extern "c" fn linkat(oldfd: fd_t, oldpath: [*:0]const u8, newfd: fd_t, newpa
 pub extern "c" fn unlink(path: [*:0]const u8) c_int;
 pub extern "c" fn unlinkat(dirfd: fd_t, path: [*:0]const u8, flags: c_uint) c_int;
 pub extern "c" fn getcwd(buf: [*]u8, size: usize) ?[*]u8;
-pub extern "c" fn waitpid(pid: c_int, stat_loc: *c_uint, options: c_uint) c_int;
+pub extern "c" fn waitpid(pid: pid_t, stat_loc: ?*c_int, options: c_int) pid_t;
 pub extern "c" fn fork() c_int;
 pub extern "c" fn access(path: [*:0]const u8, mode: c_uint) c_int;
 pub extern "c" fn faccessat(dirfd: fd_t, path: [*:0]const u8, mode: c_uint, flags: c_uint) c_int;

@@ -3435,10 +3435,10 @@ pub const WaitPidResult = struct {
 };
 
 pub fn waitpid(pid: pid_t, flags: u32) WaitPidResult {
-    const Status = if (builtin.link_libc) c_uint else u32;
+    const Status = if (builtin.link_libc) c_int else u32;
     var status: Status = undefined;
     while (true) {
-        const rc = system.waitpid(pid, &status, flags);
+        const rc = system.waitpid(pid, &status, if (builtin.link_libc) @intCast(c_int, flags) else flags);
         switch (errno(rc)) {
             0 => return .{
                 .pid = @intCast(pid_t, rc),