From da7df54309eb759837a289ade900fe8e3d6ddc36 Mon Sep 17 00:00:00 2001
From: Eli Zaretskii <eliz@gnu.org>
Date: Sat, 27 Apr 2013 14:20:49 +0300
Subject: Support --output-sync on MS-Windows.

 w32/compat/posixfcn.c: New file, with emulations of Posix
 functions and Posix functionality for MS-Windows.
 w32/subproc/sub_proc.c: Include io.h.
 (process_noinherit): New function, forces a file descriptor to not
 be inherited by child processes.
 (process_easy): Accept two additional arguments, and use them to
 set up the standard output and standard error handles of the child
 process.
 w32/include/sub_proc.h (process_easy): Adjust prototype.
 (process_noinherit): Add prototype.

 read.c [WINDOWS32]: Include windows.h and sub_proc.h.
 makeint.h (LOCALEDIR) [WINDOWS32}: Define to NULL if not
 defined.  This is needed because the MS-Windows build doesn't have
 a canonical place for LOCALEDIR.
 (WIN32_LEAN_AND_MEAN) [WINDOWS32]: Define, to avoid getting from
 windows.h header too much stuff that could conflict with the code.
 main.c <sync_mutex>: New static variable.
 <switches>: Add support for "--sync-mutex" switch.
 (decode_output_sync_flags): Decode the --sync-mutex= switch.
 (prepare_mutex_handle_string) [WINDOWS32]: New function.
 (main): Add "output-sync" to .FEATURES.
 job.h (CLOSE_ON_EXEC) [WINDOWS32]: Define to call
 process_noinherit.
 (F_GETFD, F_SETLKW, F_WRLCK, F_UNLCK, struct flock) [WINDOWS32]:
 New macros.
 (RECORD_SYNC_MUTEX): New macro, a no-op for Posix platforms.
 (sync_handle_t): New typedef.
 job.c <sync_handle>: Change type to sync_handle_t.
 (FD_NOT_EMPTY): Seek to the file's end.  Suggested by Frank
 Heckenbach <f.heckenbach@fh-soft.de>.
 (pump_from_tmp_fd) [WINDOWS32]: Switch to_fd to binary mode for
 the duration of this function, and then change back before
 returning.
 (start_job_command) [WINDOWS32]: Support output_sync mode on
 MS-Windows.  Use a system-wide mutex instead of locking
 stdout/stderr.  Call process_easy with two additional arguments:
 child->outfd and child->errfd.
 (exec_command) [WINDOWS32]: Pass two additional arguments, both
 -1, to process_easy, to adjust for the changed function signature.
 function.c (windows32_openpipe) [WINDOWS32]: This function now
 returns an int, which is -1 if it fails and zero otherwise.  It
 also calls 'error' instead of 'fatal', to avoid exiting
 prematurely.
 (func_shell_base) [WINDOWS32]: Call perror_with_name if
 windows32_openpipe fails, now that it always returns.  This avoids
 a compiler warning that error_prefix is not used in the MS-Windows
 build.
 config.h.W32.template (OUTPUT_SYNC): Define.
 build_w32.bat: Add w32/compat/posixfcn.c to compilation and
 linking commands.

 From Frank Heckenbach <f.heckenbach@fh-soft.de>:
 job.c (sync_output): Don't discard the output if
 acquire_semaphore fails; instead, dump the output unsynchronized.
---
 w32/subproc/sub_proc.c | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

(limited to 'w32/subproc/sub_proc.c')

diff --git a/w32/subproc/sub_proc.c b/w32/subproc/sub_proc.c
index 6cc3081..2c36777 100644
--- a/w32/subproc/sub_proc.c
+++ b/w32/subproc/sub_proc.c
@@ -17,6 +17,7 @@ this program.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <config.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <io.h>		/* for _get_osfhandle */
 #ifdef _MSC_VER
 # include <stddef.h>    /* for intptr_t */
 #else
@@ -341,6 +342,15 @@ process_exit_code(HANDLE proc)
 	return (((sub_process *)proc)->exit_code);
 }
 
+void
+process_noinherit(int fd)
+{
+  HANDLE fh = (HANDLE)_get_osfhandle(fd);
+
+  if (fh && fh != INVALID_HANDLE_VALUE)
+	SetHandleInformation(fh, HANDLE_FLAG_INHERIT, 0);
+}
+
 /*
 2006-02:
 All the following functions are currently unused.
@@ -1340,7 +1350,9 @@ make_command_line( char *shell_name, char *full_exec_path, char **argv)
 HANDLE
 process_easy(
 	char **argv,
-	char **envp)
+	char **envp,
+	int outfd,
+	int errfd)
 {
   HANDLE hIn = INVALID_HANDLE_VALUE;
   HANDLE hOut = INVALID_HANDLE_VALUE;
@@ -1383,7 +1395,10 @@ process_easy(
       return INVALID_HANDLE_VALUE;
     }
   }
-  tmpOut = GetStdHandle (STD_OUTPUT_HANDLE);
+  if (outfd >= 0)
+    tmpOut = (HANDLE)_get_osfhandle (outfd);
+  else
+    tmpOut = GetStdHandle (STD_OUTPUT_HANDLE);
   if (DuplicateHandle(GetCurrentProcess(),
 		      tmpOut,
 		      GetCurrentProcess(),
@@ -1410,7 +1425,10 @@ process_easy(
       return INVALID_HANDLE_VALUE;
     }
   }
-  tmpErr = GetStdHandle(STD_ERROR_HANDLE);
+  if (errfd >= 0)
+    tmpErr = (HANDLE)_get_osfhandle (errfd);
+  else
+    tmpErr = GetStdHandle(STD_ERROR_HANDLE);
   if (DuplicateHandle(GetCurrentProcess(),
 		      tmpErr,
 		      GetCurrentProcess(),
-- 
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