implemented timerfd for glibc-2.7 or earlier (debian lenny is now welcome)

CMakeLists.txt

-PROJECT (accel-pptpd)
+PROJECT (accel-pptpd C)
 cmake_minimum_required(VERSION 2.6)
 
 ADD_SUBDIRECTORY(accel-pptpd)

README

@@ -30,7 +30,6 @@ Requirment
 ----------
 1. modern linux distribution
 2. kernel-2.6.25 or later
-3. glibc-2.8 or later
 4. cmake-2.6 or later
 5. libnl-2.0 or probably later (required for l2tp and builtin shaper)
 

accel-pptpd/CMakeLists.txt

+INCLUDE(CheckLibraryExists)
+INCLUDE(CheckIncludeFiles)
+
+CHECK_LIBRARY_EXISTS(ssl MD5_Init "" HAVE_SSL)
+IF (NOT HAVE_SSL)
+	MESSAGE(FATAL_ERROR "openssl library not found")
+ENDIF (NOT HAVE_SSL)
+
+CHECK_INCLUDE_FILES("openssl/md5.h" HAVE_SSL)
+IF (NOT HAVE_SSL)
+	MESSAGE(FATAL_ERROR "openssl headers not found")
+ENDIF (NOT HAVE_SSL)
+
 SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -fvisibility=hidden -D_GNU_SOURCE -DGCC_SPINLOCK -DMEMDEBUG")
 
 INCLUDE_DIRECTORIES(include)

accel-pptpd/extra/sigchld.c

@@ -2,7 +2,6 @@
 #include <string.h>
 #include <errno.h>
 #include <signal.h>
-#include <sys/signalfd.h>
 #include <sys/wait.h>
 
 #include "triton.h"

accel-pptpd/include/linux_ppp.h

@@ -11,9 +11,9 @@
 #define __aligned_u64 __u64 __attribute__((aligned(8)))
 #endif
 
+#include <linux/ppp_defs.h>
 #include <linux/if.h>
 #include <linux/if_ppp.h>
-#include <linux/ppp_defs.h>
 
 #endif
 

accel-pptpd/logs/CMakeLists.txt

 ADD_LIBRARY(log_file SHARED log_file.c)
-TARGET_LINK_LIBRARIES(log_file aio rt)
+TARGET_LINK_LIBRARIES(log_file rt)
 
 INSTALL(TARGETS log_file
 	LIBRARY DESTINATION usr/lib/accel-pptp

accel-pptpd/logs/log_file.c

@@ -6,7 +6,6 @@
 #include <unistd.h>
 #include <limits.h>
 #include <aio.h>
-#include <sys/signalfd.h>
 
 #include "log.h"
 #include "events.h"

accel-pptpd/triton/CMakeLists.txt

@@ -9,6 +9,25 @@ SET(sources_c
 	event.c
 )
 
+INCLUDE(CheckFunctionExists)
+CHECK_FUNCTION_EXISTS(timerfd_create HAVE_TIMERFD)
+
+IF (HAVE_TIMERFD)
+	ADD_DEFINITIONS(-DHAVE_TIMERFD)
+ELSE (HAVE_TIMERFD)
+	INCLUDE (CheckCSourceCompiles)
+	CHECK_C_SOURCE_COMPILES("
+	#include <sys/syscall.h>
+	int main()
+	{
+		syscall(SYS_timerfd_create);
+	}" HAVE_SYSCALL)
+	IF (NOT HAVE_SYSCALL)
+		MESSAGE(FATAL_ERROR "Your system is too old and is not supported by accel-pptp, sorry...")
+	ENDIF (NOT HAVE_SYSCALL)
+	SET(sources_c ${sources_c} timerfd.c)
+ENDIF (HAVE_TIMERFD)
+
 INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR})
 
 ADD_DEFINITIONS(-DMODULE_PATH="${CMAKE_INSTALL_PREFIX}/usr/lib/accel-pptp")

accel-pptpd/triton/timer.c

@@ -2,10 +2,16 @@
 #include <stdlib.h>
 #include <sys/time.h>
 #include <sys/epoll.h>
-#include <sys/timerfd.h>
 #include <string.h>
 #include <errno.h>
 #include <unistd.h>
+#include <fcntl.h>
+
+#ifdef HAVE_TIMERFD
+#include <sys/timerfd.h>
+#else
+#include "timerfd.h"
+#endif
 
 #include "triton_p.h"
 
@@ -94,6 +100,7 @@ void *timer_thread(void *arg)
 	return NULL;
 }
 
+
 int __export triton_timer_add(struct triton_context_t *ctx, struct triton_timer_t *ud, int abs_time)
 {
 	struct _triton_timer_t *t = mempool_alloc(timer_pool);
@@ -106,20 +113,22 @@ int __export triton_timer_add(struct triton_context_t *ctx, struct triton_timer_
 		t->ctx = (struct _triton_context_t *)ctx->tpd;
 	else
 		t->ctx = (struct _triton_context_t *)default_ctx->tpd;
-	t->fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
+	t->fd = timerfd_create(CLOCK_MONOTONIC, 0);
 	if (t->fd < 0) {
-		triton_log_error("timer:timerfd_create: %s" ,strerror(errno));
+		triton_log_error("timer:timerfd_create: %s", strerror(errno));
 		mempool_free(t);
 		return -1;
 	}
+
+	if (fcntl(t->fd, F_SETFL, O_NONBLOCK)) { 
+    triton_log_error("timer: failed to set nonblocking mode: %s\n", strerror(errno));
+    goto out_err;
+	}
 	
 	ud->tpd = t;
 
-	if (triton_timer_mod(ud, abs_time)) {
-		close(t->fd);
-		mempool_free(t);
-		return -1;
-	}
+	if (triton_timer_mod(ud, abs_time))
+		goto out_err;
 	
 	spin_lock(&t->ctx->lock);
 	list_add_tail(&t->entry, &t->ctx->timers);
@@ -131,15 +140,18 @@ int __export triton_timer_add(struct triton_context_t *ctx, struct triton_timer_
 		t->ud = NULL;
 		list_del(&t->entry);
 		spin_unlock(&t->ctx->lock);
-		close(t->fd);
-		mempool_free(t);
-		ud->tpd = NULL;
-		return -1;
+		goto out_err;
 	}
 
 	__sync_fetch_and_add(&triton_stat.timer_count, 1);
 	
 	return 0;
+
+out_err:
+	ud->tpd = NULL;
+	close(t->fd);
+	mempool_free(t);
+	return -1;
 }
 int __export triton_timer_mod(struct triton_timer_t *ud,int abs_time)
 {

accel-pptpd/triton/timerfd.c

+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+#include "timerfd.h"
+
+int timerfd_create (clockid_t __clock_id, int __flags)
+{
+	return syscall(SYS_timerfd_create, __clock_id, __flags);
+}
+
+
+int timerfd_settime (int __ufd, int __flags,
+			    __const struct itimerspec *__utmr,
+			    struct itimerspec *__otmr)
+{
+	return syscall(SYS_timerfd_settime, __ufd, __flags, __utmr, __otmr);
+}
+

accel-pptpd/triton/timerfd.h

+/* Copyright (C) 2008 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef	_SYS_TIMERFD_H
+#define	_SYS_TIMERFD_H	1
+
+#include <time.h>
+
+
+/* Bits to be set in the FLAGS parameter of `timerfd_create'.  */
+enum
+  {
+    TFD_CLOEXEC = 02000000,
+#define TFD_CLOEXEC TFD_CLOEXEC
+    TFD_NONBLOCK = 04000
+#define TFD_NONBLOCK TFD_NONBLOCK
+  };
+
+
+/* Bits to be set in the FLAGS parameter of `timerfd_settime'.  */
+enum
+  {
+    TFD_TIMER_ABSTIME = 1 << 0
+#define TFD_TIMER_ABSTIME TFD_TIMER_ABSTIME
+  };
+
+
+__BEGIN_DECLS
+
+/* Return file descriptor for new interval timer source.  */
+extern int timerfd_create (clockid_t __clock_id, int __flags) __THROW;
+
+/* Set next expiration time of interval timer source UFD to UTMR.  If
+   FLAGS has the TFD_TIMER_ABSTIME flag set the timeout value is
+   absolute.  Optionally return the old expiration time in OTMR.  */
+extern int timerfd_settime (int __ufd, int __flags,
+			    __const struct itimerspec *__utmr,
+			    struct itimerspec *__otmr) __THROW;
+
+/* Return the next expiration time of UFD.  */
+extern int timerfd_gettime (int __ufd, struct itimerspec *__otmr) __THROW;
+
+__END_DECLS
+
+#endif /* sys/timerfd.h */