simple: Add fdopen

1 files changed, 18 insertions, 0 deletions

diff --git a/luxio/simple.lua b/luxio/simple.lua
index 1f81d30..bb654e0 100644
--- a/luxio/simple.lua
+++ b/luxio/simple.lua
@@ -814,6 +814,23 @@ local function open(filename, flags, mode)
     return sio_wrap_mt(r, false, filename)
 end
 
+--- Open a file from a file descriptor.
+--- @tparam number fd file descriptor to open from
+--- @treturn file|nil File handle, or nil if error
+--- @treturn string|nil Error string if error
+--- @treturn errno|nil Error number if error
+--- @function fdopen
+local function fdopen(fd)
+    -- Ensure the fd is valid before returning a file handle for it
+    local flags, errno = l_fcntl(fd, l.F_GETFL)
+
+    if flags == -1 then
+        return err("fdopen", errno)
+    end
+
+    return sio_wrap_mt(fd, false, nil)
+end
+
 local pipe_count = 0
 
 --- Create an anonymous pipe.
@@ -1461,6 +1478,7 @@ end
 
 return {
     open = open,
+    fdopen = fdopen,
     pipe = pipe,
     socketpair = socketpair,
     inet = inet,