Merge pull request #7 from nabbar/AddWindowsRLimit

Add windows r limit capabilities for File Descriptor (NOFILE)
 *  For Windows build, please follow this note :
 *	1) install package gcc-multilib gcc-mingw-w64 to build C source with GCC
 *		you will having this binaries
 *			- i686-w64-mingw32* for 32-bit Windows;
 *			- x86_64-w64-mingw32* for 64-bit Windows.
 *		locate you binaries gcc mingw path and note it:
 *			- win32 : updatedb && locate i686-w64-mingw32-gcc
 *			- win64 : updatedb && locate x86_64-w64-mingw32-gcc
 *	2) if you have an error in the build, or if the .o object file is not present in golib/njg-ioutils/maxstdio/, run this step
 *		- go to golib/njg-ioutils/maxstdio folder
 *		- gcc -c maxstdio.c
 *	3) for Win32 use this env var in prefix of your go build command (recommend to use -a flag) :
 *		CC=/usr/bin/i686-w64-mingw32-gcc CGO_ENABLED=1 GOOS=windows GOARCH=amd64 go build -a -v ...
 *	4) for win64 use this env var in prefix of your go build command (recommend to use -a flag) :
 *		CC=/usr/bin/x86_64-w64-mingw32-gcc CGO_ENABLED=1 GOOS=windows GOARCH=amd64 go build -a -v ...
 *
 *	Normally no problem will be result in the build

njs-ioutils/fileDescriptor.go

@@ -29,6 +29,25 @@ package njs_ioutils
  * SystemFileDescriptor is returning current Limit & max system limit for file descriptor (open file or I/O resource) currently set in the system
  * This function return the current setting (current number of file descriptor and the max value) if the newValue given is zero
  * Otherwise if the newValue is more than the current system limit, try to change the current limit in the system for this process only
+ *
+ *  For Windows build, please follow this note :
+ *	1) install package gcc-multilib gcc-mingw-w64 to build C source with GCC
+ *		you will having this binaries
+ *			- i686-w64-mingw32* for 32-bit Windows;
+ *			- x86_64-w64-mingw32* for 64-bit Windows.
+ *		locate you binaries gcc mingw path and note it:
+ *			- win32 : updatedb && locate i686-w64-mingw32-gcc
+ *			- win64 : updatedb && locate x86_64-w64-mingw32-gcc
+ *	2) if you have an error in the build, or if the .o object file is not present in golib/njg-ioutils/maxstdio/, run this step
+ *		- go to golib/njg-ioutils/maxstdio folder
+ *		- gcc -c maxstdio.c
+ *	3) for Win32 use this env var in prefix of your go build command (recommend to use -a flag) :
+ *		CC=/usr/bin/i686-w64-mingw32-gcc CGO_ENABLED=1 GOOS=windows GOARCH=amd64 go build -a -v ...
+ *	4) for win64 use this env var in prefix of your go build command (recommend to use -a flag) :
+ *		CC=/usr/bin/x86_64-w64-mingw32-gcc CGO_ENABLED=1 GOOS=windows GOARCH=amd64 go build -a -v ...
+ *
+ *	Normally no problem will be result in the build
+ *
  */
 func SystemFileDescriptor(newValue int) (current int, max int, err error) {
 	return systemFileDescriptor(newValue)

njs-ioutils/fileDescriptor_ko.go

@@ -27,8 +27,23 @@
 
 package njs_ioutils
 
-import "fmt"
+import (
+	"github.com/nabbar/golib/njs-ioutils/maxstdio"
+)
 
 func systemFileDescriptor(newValue int) (current int, max int, err error) {
-	return 0, 0, fmt.Errorf("rLimit is nor implemented in current system")
+	rLimit := maxstdio.GetMaxStdio()
+
+	if rLimit < 0 {
+		// default windows value
+		rLimit = 512
+	}
+
+	if newValue > rLimit {
+		rLimit = int(maxstdio.SetMaxStdio(newValue))
+		return SystemFileDescriptor(0)
+	}
+
+	return rLimit, rLimit, nil
+	//	return 0, 0, fmt.Errorf("rLimit is nor implemented in current system")
 }

njs-ioutils/maxstdio/maxstdio.c

@@ -0,0 +1,10 @@
+#include "maxstdio.h"
+#include <stdio.h>
+
+int CGetMaxSTDIO() {
+	return _getmaxstdio();
+}
+
+int CSetMaxSTDIO(int new_max) {
+	return _setmaxstdio(new_max);
+}

njs-ioutils/maxstdio/maxstdio.go

@@ -0,0 +1,16 @@
+// +build windows cgo
+
+package maxstdio
+
+// #cgo CFLAGS: -g -Wall
+// #include <stdlib.h>
+// #include "maxstdio.h"
+import "C"
+
+func GetMaxStdio() int {
+	return int(C.CGetMaxSTDIO())
+}
+
+func SetMaxStdio(newMax int) int {
+	return int(C.CSetMaxSTDIO(C.int(newMax)))
+}

njs-ioutils/maxstdio/maxstdio.h

@@ -0,0 +1,5 @@
+#ifndef _MAXSTDIO_H
+#define _MAXSTDIO_H
+int CGetMaxSTDIO();
+int CSetMaxSTDIO(int new_max);
+#endif

test/test-win-max-nofile/main.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	njs_ioutils "github.com/nabbar/golib/njs-ioutils"
+)
+
+func main() {
+	println("test to print Max STDIO NOFILE capabilities !!")
+	c, _, e := njs_ioutils.SystemFileDescriptor(0)
+	println(fmt.Sprintf("Actual limit is : %v | err : %v", c, e))
+
+	if e != nil {
+		os.Exit(1)
+	}
+
+	println("test to Change Max STDIO NOFILE capabilities !!")
+	c, _, e = njs_ioutils.SystemFileDescriptor(c + 512)
+	println(fmt.Sprintf("New limit is : %v | err : %v", c, e))
+
+	if e != nil {
+		os.Exit(1)
+	}
+}