fix(pyconfig): c_defined reverted;getrandom never declared

Author: litlighilit

src/pylib/Lib/os_impl/randoms.nim

@@ -68,13 +68,6 @@ when have_getrandom_syscall:
   import ../signal_impl/c_api
   import ../../pyerrors/oserr
 
-  let SYS_getrandom {.importc, header: "<sys/syscall.h>".}: clong
-  const syscallHeader = """#include <unistd.h>
-  #include <sys/syscall.h>"""
-  proc syscall(n: clong): clong {.
-      importc: "syscall", varargs, header: syscallHeader.}
-
-
   proc getrandom*(size: int, flags = 0): seq[uint8] =
 
     if size < 0:

src/pylib/pyconfig/bootstrap_hash.nim

@@ -2,8 +2,32 @@
 
 when defined(linux):
   import ./util
-  c_defined have_getrandom, "HAVE_GETRANDOM", ["<sys/random.h>"]
-  c_defined have_getrandom_syscall, "HAVE_GETRANDOM_SYSCALL", ["<sys/random.h>"]
+  AC_LINK_IFELSE have_getrandom, false:
+    proc getrandom(buf: pointer, buflen: uint, flags: cuint): int{.importc,
+      header: "<sys/random.h>".}
+    var buffer: char
+    let buflen = uint 1
+    let flags = cuint 0
+    # ignore the result, Python checks for ENOSYS at runtime
+    discard getrandom(addr buffer, buflen, flags)
+  
+  template syscalChkAndExport(def){.dirty.} =
+    AC_LINK_IFELSE have_getrandom_syscall, false:
+      def
+      var buffer: char
+      let buflen = uint 1
+      let flags{.importc: "GRND_NONBLOCK", header: "<sys/random.h>".}: cint
+      # ignore the result, Python checks for ENOSYS at runtime
+      discard syscall(SYS_getrandom, addr buffer, buflen, flags)
+    when have_getrandom_syscall:
+      def
+
+  syscalChkAndExport:
+    let SYS_getrandom* {.importc, header: "<sys/syscall.h>".}: clong
+    const syscallHeader = """#include <unistd.h>
+    #include <sys/syscall.h>"""
+    proc syscall*(n: clong): clong {.
+        importc: "syscall", varargs, header: syscallHeader.}
 else:
   const
     have_getrandom* = false

src/pylib/pyconfig/util.nim

@@ -162,9 +162,9 @@ template c_defined*(variable; c_macro: string; headers: openArray = []) =
       """
     exit(
   #if defined(""" & c_macro & """)
-      1
-  #else
       0
+  #else
+      1
   #endif
     );
   """.}