bpo-45847: Port fcntl to Py_STDLIB_MOD (GH-29696)

Co-authored-by: Christian Heimes <christian@python.org>

Modules/Setup.stdlib.in

@@ -87,6 +87,7 @@
 # Modules with some UNIX dependencies
 #
 
+@MODULE_FCNTL_TRUE@fcntl fcntlmodule.c
 @MODULE_GRP_TRUE@grp grpmodule.c
 # needs sys/soundcard.h or linux/soundcard.h (Linux, FreeBSD)
 @MODULE_OSSAUDIODEV_TRUE@ossaudiodev ossaudiodev.c

configure

@@ -688,6 +688,8 @@ MODULE_OSSAUDIODEV_FALSE
 MODULE_OSSAUDIODEV_TRUE
 MODULE_GRP_FALSE
 MODULE_GRP_TRUE
+MODULE_FCNTL_FALSE
+MODULE_FCNTL_TRUE
 MODULE__DATETIME_FALSE
 MODULE__DATETIME_TRUE
 MODULE_MATH_FALSE
@@ -13343,7 +13345,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_flock_decl" >&5
 $as_echo "$ac_cv_flock_decl" >&6; }
-if test "x${ac_cv_flock_decl}" = xyes; then
+if test "x$ac_cv_flock_decl" = xyes; then :
   for ac_func in flock
 do :
   ac_fn_c_check_func "$LINENO" "flock" "ac_cv_func_flock"
@@ -13352,7 +13354,9 @@ if test "x$ac_cv_func_flock" = xyes; then :
 #define HAVE_FLOCK 1
 _ACEOF
 
-else
+fi
+done
+
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for flock in -lbsd" >&5
 $as_echo_n "checking for flock in -lbsd... " >&6; }
 if ${ac_cv_lib_bsd_flock+:} false; then :
@@ -13390,18 +13394,10 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_bsd_flock" >&5
 $as_echo "$ac_cv_lib_bsd_flock" >&6; }
 if test "x$ac_cv_lib_bsd_flock" = xyes; then :
-  $as_echo "#define HAVE_FLOCK 1" >>confdefs.h
-
-
-$as_echo "#define FLOCK_NEEDS_LIBBSD 1" >>confdefs.h
-
-
+  FCNTL_LIBS="-lbsd"
 fi
 
 
-fi
-done
-
 fi
 
 
@@ -19756,6 +19752,43 @@ fi
 
 
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for stdlib extension module fcntl" >&5
+$as_echo_n "checking for stdlib extension module fcntl... " >&6; }
+      case $py_stdlib_not_available in #(
+  *fcntl*) :
+    py_cv_module_fcntl=n/a ;; #(
+  *) :
+    if true; then :
+  if test "$ac_cv_header_sys_ioctl_h" = "yes" -a "$ac_cv_header_fcntl_h" = "yes"; then :
+  py_cv_module_fcntl=yes
+else
+  py_cv_module_fcntl=missing
+fi
+else
+  py_cv_module_fcntl=disabled
+fi
+   ;;
+esac
+  as_fn_append MODULE_BLOCK "MODULE_FCNTL=$py_cv_module_fcntl$as_nl"
+  if test "x$py_cv_module_fcntl" = xyes; then :
+
+
+    as_fn_append MODULE_BLOCK "MODULE_FCNTL_LDFLAGS=$FCNTL_LIBS$as_nl"
+
+fi
+   if test "$py_cv_module_fcntl" = yes; then
+  MODULE_FCNTL_TRUE=
+  MODULE_FCNTL_FALSE='#'
+else
+  MODULE_FCNTL_TRUE='#'
+  MODULE_FCNTL_FALSE=
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $py_cv_module_fcntl" >&5
+$as_echo "$py_cv_module_fcntl" >&6; }
+
+
+
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for stdlib extension module grp" >&5
 $as_echo_n "checking for stdlib extension module grp... " >&6; }
       case $py_stdlib_not_available in #(
@@ -20892,6 +20925,10 @@ if test -z "${MODULE__DATETIME_TRUE}" && test -z "${MODULE__DATETIME_FALSE}"; th
   as_fn_error $? "conditional \"MODULE__DATETIME\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${MODULE_FCNTL_TRUE}" && test -z "${MODULE_FCNTL_FALSE}"; then
+  as_fn_error $? "conditional \"MODULE_FCNTL\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 if test -z "${MODULE_GRP_TRUE}" && test -z "${MODULE_GRP_FALSE}"; then
   as_fn_error $? "conditional \"MODULE_GRP\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5

configure.ac

@@ -3980,14 +3980,11 @@ AC_CACHE_CHECK([for flock declaration], [ac_cv_flock_decl],
     [ac_cv_flock_decl=no]
   )
 ])
-if test "x${ac_cv_flock_decl}" = xyes; then
-  AC_CHECK_FUNCS(flock,,
-    AC_CHECK_LIB(bsd,flock,
-      [AC_DEFINE(HAVE_FLOCK)
-       AC_DEFINE(FLOCK_NEEDS_LIBBSD, 1, Define if flock needs to be linked with bsd library.)
-    ])
-  )
-fi
+dnl Linking with libbsd may be necessary on AIX for flock function.
+AS_VAR_IF([ac_cv_flock_decl], [yes],
+  AC_CHECK_FUNCS([flock])
+  AC_CHECK_LIB([bsd], [flock], [FCNTL_LIBS="-lbsd"])
+)
 
 PY_CHECK_FUNC([getpagesize], [#include <unistd.h>])
 
@@ -6095,6 +6092,11 @@ PY_STDLIB_MOD_SIMPLE([math], [], [$LIBM])
 dnl needs libm and on some platforms librt
 PY_STDLIB_MOD_SIMPLE([_datetime], [], [$TIMEMODULE_LIB $LIBM])
 
+dnl needs libbsd on some platforms
+PY_STDLIB_MOD([fcntl],
+  [], [test "$ac_cv_header_sys_ioctl_h" = "yes" -a "$ac_cv_header_fcntl_h" = "yes"],
+  [], [$FCNTL_LIBS])
+
 dnl platform specific extensions
 PY_STDLIB_MOD([grp], [], [test "$ac_cv_func_getgrgid" = yes -o "$ac_cv_func_getgrgid_r" = yes])
 PY_STDLIB_MOD([ossaudiodev],

pyconfig.h.in

@@ -51,9 +51,6 @@
    significant word first */
 #undef FLOAT_WORDS_BIGENDIAN
 
-/* Define if flock needs to be linked with bsd library. */
-#undef FLOCK_NEEDS_LIBBSD
-
 /* Define if getpgrp() must be called as getpgrp(0). */
 #undef GETPGRP_HAVE_ARG
 

setup.py

@@ -1030,12 +1030,7 @@ class PyBuildExt(build_ext):
         # supported...)
 
         # fcntl(2) and ioctl(2)
-        libs = []
-        if (self.config_h_vars.get('FLOCK_NEEDS_LIBBSD', False)):
-            # May be necessary on AIX for flock function
-            libs = ['bsd']
-        self.add(Extension('fcntl', ['fcntlmodule.c'],
-                           libraries=libs))
+        self.addext(Extension('fcntl', ['fcntlmodule.c']))
         # grp(3)
         self.addext(Extension('grp', ['grpmodule.c']))
         self.addext(Extension('spwd', ['spwdmodule.c']))