Flatten GNU Make directory structure

third_party/make/os.h

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+/* clang-format off */
+/* Declarations for operating system interfaces for GNU Make.
+Copyright (C) 2016-2020 Free Software Foundation, Inc.
+This file is part of GNU Make.
+
+GNU Make is free software; you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software
+Foundation; either version 3 of the License, or (at your option) any later
+version.
+
+GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+
+/* This section provides OS-specific functions to support the jobserver.  */
+
+#ifdef MAKE_JOBSERVER
+
+/* Returns 1 if the jobserver is enabled, else 0.  */
+unsigned int jobserver_enabled (void);
+
+/* Called in the master instance to set up the jobserver initially.  */
+unsigned int jobserver_setup (int job_slots);
+
+/* Called in a child instance to connect to the jobserver.  */
+unsigned int jobserver_parse_auth (const char* auth);
+
+/* Returns an allocated buffer used to pass to child instances.  */
+char *jobserver_get_auth (void);
+
+/* Clear this instance's jobserver configuration.  */
+void jobserver_clear (void);
+
+/* Recover all the jobserver tokens and return the number we got.  */
+unsigned int jobserver_acquire_all (void);
+
+/* Release a jobserver token.  If it fails and is_fatal is 1, fatal.  */
+void jobserver_release (int is_fatal);
+
+/* Notify the jobserver that a child exited.  */
+void jobserver_signal (void);
+
+/* Get ready to start a non-recursive child.  */
+void jobserver_pre_child (int);
+
+/* Complete starting a non-recursive child.  */
+void jobserver_post_child (int);
+
+/* Set up to acquire a new token.  */
+void jobserver_pre_acquire (void);
+
+/* Wait until we can acquire a jobserver token.
+   TIMEOUT is 1 if we have other jobs waiting for the load to go down;
+   in this case we won't wait forever, so we can check the load.
+   Returns 1 if we got a token, or 0 if we stopped waiting due to a child
+   exiting or a timeout.    */
+unsigned int jobserver_acquire (int timeout);
+
+#else
+
+#define jobserver_enabled()         (0)
+#define jobserver_setup(_slots)     (0)
+#define jobserver_parse_auth(_auth) (0)
+#define jobserver_get_auth()        (NULL)
+#define jobserver_clear()           (void)(0)
+#define jobserver_release(_fatal)   (void)(0)
+#define jobserver_acquire_all()     (0)
+#define jobserver_signal()          (void)(0)
+#define jobserver_pre_child(_r)     (void)(0)
+#define jobserver_post_child(_r)    (void)(0)
+#define jobserver_pre_acquire()     (void)(0)
+#define jobserver_acquire(_tmout)   (0)
+
+#endif
+
+/* Create a "bad" file descriptor for stdin when parallel jobs are run.  */
+#if defined(VMS) || defined(WINDOWS32) || defined(_AMIGA) || defined(__MSDOS__)
+# define get_bad_stdin() (-1)
+#else
+int get_bad_stdin (void);
+#endif
+
+/* Set a file descriptor to close/not close in a subprocess.  */
+#if defined(VMS) || defined(_AMIGA) || defined(__MSDOS__)
+# define fd_inherit(_i)   0
+# define fd_noinherit(_i) 0
+#else
+void fd_inherit (int);
+void fd_noinherit (int);
+#endif