feat(Lib/os): umask

Author: litlighilit

src/pylib/Lib/os_impl/posix_like.nim

@@ -2,11 +2,11 @@
 
 import ./posix_like/[
   fdopen, open_close, lseek, seek_consts, truncate, stat, scandirImpl, mkrmdir, unlink,
-  rename, isatty, links, utime, get_id, chmods
+  rename, isatty, links, utime, get_id, chmods, umaskImpl
 ]
 
 export seek_consts except toCSEEK
 export stat except statAttr
 export
   fdopen, open_close, lseek, truncate, scandirImpl, mkrmdir, unlink,
-  rename, isatty, links, utime, get_id, chmods
+  rename, isatty, links, utime, get_id, chmods, umaskImpl

src/pylib/Lib/os_impl/posix_like/umaskImpl.nim

@@ -0,0 +1,14 @@
+
+when defined(windows):
+  proc umask(mode: cint): cint {.importc: "_umask", header: "<sys/stat.h>".}
+else:
+  import std/posix
+
+import ../common  # raiseErrno
+
+proc umask*(mode: int): int{.discardable.} =
+  result =
+    when defined(windows): int umask(mode.cint)
+    else: int posix.umask(mode.Mode)
+  if result < 0:
+    raiseErrno()