From 2851280824fc21dcbba0a87379459bdf1d1c6ad1 Mon Sep 17 00:00:00 2001
From: David Schleef <ds@schleef.org>
Date: Wed, 12 Jun 2002 02:02:05 +0000
Subject: [PATCH] Add symbol versioning.  Versions need to be checked with
 0.7.18 release.

---
 lib/Makefile       |  4 ++--
 lib/buffer.c       |  8 ++++++++
 lib/cmd.c          |  2 ++
 lib/comedi.c       | 17 ++++++++++++-----
 lib/data.c         |  6 +++++-
 lib/dio.c          |  4 ++++
 lib/error.c        |  4 ++++
 lib/get.c          | 14 ++++++++++++++
 lib/libinternal.h  |  7 +++++++
 lib/range.c        |  8 ++++++++
 lib/sv.c           |  4 +++-
 lib/timed.c        |  1 +
 lib/timer.c        |  1 +
 lib/version_script | 23 ++++++++++++++++-------
 14 files changed, 87 insertions(+), 16 deletions(-)

diff --git a/lib/Makefile b/lib/Makefile
index 34e5065..ef07fb7 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -9,9 +9,9 @@ OBJS=comedi.o timer.o sv.o range.o ioctl.o filler.o timed.o error.o \
 
 SONAME=libcomedi$(SONAME_SUFFIX).so.0
 
-libcomedi.a: $(OBJS)
+libcomedi.a: $(OBJS) version_script
 	#$(CC) -shared -Wl,-soname,libcomedi.so,-T,version_script -o libcomedi.so.${VERSION_CODE} $(OBJS) -lm
-	$(CC) -shared -Wl,-soname,$(SONAME) -o libcomedi.so.${version} $(OBJS) -lm
+	$(CC) -shared -Wl,-soname,$(SONAME) -Wl,--version-script,version_script -o libcomedi.so.${version} $(OBJS) -lm
 	$(AR) rs libcomedi.a $(OBJS)
 	ln -sf libcomedi.so.${version} libcomedi.so
 	ln -sf libcomedi.so.${version} libcomedi.so.0
diff --git a/lib/buffer.c b/lib/buffer.c
index 9970a41..394fb6c 100644
--- a/lib/buffer.c
+++ b/lib/buffer.c
@@ -25,6 +25,7 @@
 
 #include <libinternal.h>
 
+EXPORT_SYMBOL(comedi_set_buffer_size,0.7.18);
 int comedi_set_buffer_size(comedi_t *it, unsigned int subdev, unsigned int size)
 {
 	int ret;
@@ -40,6 +41,7 @@ int comedi_set_buffer_size(comedi_t *it, unsigned int subdev, unsigned int size)
 	return bc.size;
 }
 
+EXPORT_SYMBOL(comedi_set_max_buffer_size,0.7.18);
 int comedi_set_max_buffer_size(comedi_t *it, unsigned int subdev, unsigned int max_size)
 {
 	int ret;
@@ -55,21 +57,25 @@ int comedi_set_max_buffer_size(comedi_t *it, unsigned int subdev, unsigned int m
 	return bc.maximum_size;
 }
 
+EXPORT_SYMBOL(comedi_get_max_buffer_size,0.7.18);
 int comedi_get_max_buffer_size(comedi_t *it, unsigned int subdevice)
 {
 	return comedi_set_max_buffer_size(it, subdevice, 0);
 }
 
+EXPORT_SYMBOL(comedi_get_buffer_size,0.7.18);
 int comedi_get_buffer_size(comedi_t *it, unsigned int subdev)
 {
 	return comedi_set_buffer_size(it, subdev, 0);
 }
 
+EXPORT_SYMBOL(comedi_get_buffer_contents,0.7.18);
 int comedi_get_buffer_contents(comedi_t *it, unsigned int subdev)
 {
 	return comedi_mark_buffer_read(it, subdev, 0);
 }
 
+EXPORT_SYMBOL(comedi_mark_buffer_read,0.7.18);
 int comedi_mark_buffer_read(comedi_t *it, unsigned int subdev, unsigned int bytes)
 {
 	int ret;
@@ -83,6 +89,7 @@ int comedi_mark_buffer_read(comedi_t *it, unsigned int subdev, unsigned int byte
 	return bi.buf_int_count - bi.buf_user_count;
 }
 
+EXPORT_SYMBOL(comedi_get_buffer_offset,0.7.18);
 int comedi_get_buffer_offset(comedi_t *it, unsigned int subdev)
 {
 	int ret;
@@ -94,6 +101,7 @@ int comedi_get_buffer_offset(comedi_t *it, unsigned int subdev)
 	return bi.buf_user_ptr;
 }
 
+EXPORT_SYMBOL(comedi_get_front_count,0.7.18);
 int comedi_get_front_count(comedi_t *it, unsigned int subdev)
 {
 	int ret;
diff --git a/lib/cmd.c b/lib/cmd.c
index 832d83f..21caf0f 100644
--- a/lib/cmd.c
+++ b/lib/cmd.c
@@ -37,6 +37,7 @@
 #include <libinternal.h>
 
 
+EXPORT_SYMBOL(comedi_get_cmd_src_mask,0.7.18);
 int comedi_get_cmd_src_mask(comedi_t *it,unsigned int subd,comedi_cmd *cmd)
 {
 	subdevice *s;
@@ -156,6 +157,7 @@ static int __generic_timed(comedi_t *it,unsigned int s,
 	return -1;
 }
 
+EXPORT_SYMBOL(comedi_get_cmd_generic_timed,0.7.18);
 int comedi_get_cmd_generic_timed(comedi_t *it,unsigned int subd,comedi_cmd *cmd,
 	unsigned int ns)
 {
diff --git a/lib/comedi.c b/lib/comedi.c
index 8e20fe5..974c9bf 100644
--- a/lib/comedi.c
+++ b/lib/comedi.c
@@ -49,6 +49,7 @@ INTERNAL void initialize(void)
 	}
 }
   
+EXPORT_SYMBOL(comedi_open,0.7.18);
 comedi_t *comedi_open(const char *fn)
 {
 	comedi_t *it;
@@ -82,11 +83,7 @@ cleanup:
 	return NULL;
 }
 
-#if 0
-/* this is an example of how we do versioned symbols */
-__asm__(".symver comedi_open_0,comedi_open@");
-#endif
-
+EXPORT_SYMBOL(comedi_open,0.7.18);
 int comedi_close(comedi_t *it)
 {
 	subdevice *s;
@@ -122,16 +119,19 @@ int comedi_close(comedi_t *it)
 	return 0;
 }
 
+EXPORT_SYMBOL(comedi_cancel,0.7.18);
 int comedi_cancel(comedi_t *it,unsigned int subdevice)
 {
 	return comedi_ioctl(it->fd,COMEDI_CANCEL,subdevice);
 }
 
+EXPORT_SYMBOL(comedi_poll,0.7.18);
 int comedi_poll(comedi_t *it,unsigned int subdevice)
 {
 	return comedi_ioctl(it->fd,COMEDI_POLL,subdevice);
 }
 
+EXPORT_SYMBOL(comedi_fileno,0.7.18);
 int comedi_fileno(comedi_t *it)
 {
 	if(!it)
@@ -140,6 +140,7 @@ int comedi_fileno(comedi_t *it)
 	return it->fd;
 }
 
+EXPORT_SYMBOL(comedi_trigger,0.7.18);
 int comedi_trigger(comedi_t *it,comedi_trig *t)
 {
 	if(!it || !t)
@@ -148,6 +149,7 @@ int comedi_trigger(comedi_t *it,comedi_trig *t)
 	return comedi_ioctl(it->fd, COMEDI_TRIG, (unsigned long)t);
 }
 
+EXPORT_SYMBOL(comedi_command,0.7.18);
 int comedi_command(comedi_t *it,comedi_cmd *t)
 {
 	int ret;
@@ -161,6 +163,7 @@ int comedi_command(comedi_t *it,comedi_cmd *t)
 	return ret;
 }
 
+EXPORT_SYMBOL(comedi_command_test,0.7.18);
 int comedi_command_test(comedi_t *it,comedi_cmd *t)
 {
 	int ret;
@@ -174,6 +177,7 @@ int comedi_command_test(comedi_t *it,comedi_cmd *t)
 	return ret;
 }
 
+EXPORT_SYMBOL(comedi_do_insnlist,0.7.18);
 int comedi_do_insnlist(comedi_t *it,comedi_insnlist *il)
 {
 	int ret;
@@ -182,6 +186,7 @@ int comedi_do_insnlist(comedi_t *it,comedi_insnlist *il)
 	return ret;
 }
 
+EXPORT_SYMBOL(comedi_do_insn,0.7.18);
 int comedi_do_insn(comedi_t *it,comedi_insn *insn)
 {
 	if(it->has_insn_ioctl){
@@ -200,11 +205,13 @@ int comedi_do_insn(comedi_t *it,comedi_insn *insn)
 	}
 }
 
+EXPORT_SYMBOL(comedi_lock,0.7.18);
 int comedi_lock(comedi_t *it,unsigned int subdevice)
 {
 	return comedi_ioctl(it->fd, COMEDI_LOCK, subdevice);
 }
 
+EXPORT_SYMBOL(comedi_unlock,0.7.18);
 int comedi_unlock(comedi_t *it,unsigned int subdevice)
 {
 	return comedi_ioctl(it->fd, COMEDI_UNLOCK, subdevice);
diff --git a/lib/data.c b/lib/data.c
index d6d84dc..3133f28 100644
--- a/lib/data.c
+++ b/lib/data.c
@@ -36,7 +36,7 @@
 #include <libinternal.h>
 
 
-
+EXPORT_SYMBOL(comedi_data_write,0.7.18);
 int comedi_data_write(comedi_t *it,unsigned int subdev,unsigned int chan,unsigned int range,
 		unsigned int aref,lsampl_t data)
 {
@@ -143,6 +143,7 @@ static inline int comedi_internal_data_read_n(comedi_t *it,
 	}
 }
 
+EXPORT_SYMBOL(comedi_data_read_n,0.7.19);
 int comedi_data_read_n(comedi_t *it, unsigned int subdev,
 	unsigned int chan, unsigned int range,
 	unsigned int aref, lsampl_t *data, unsigned int n)
@@ -168,6 +169,7 @@ int comedi_data_read_n(comedi_t *it, unsigned int subdev,
 	return 0;
 }
 
+EXPORT_SYMBOL(comedi_data_read,0.7.18);
 int comedi_data_read(comedi_t *it, unsigned int subdev, unsigned int chan,
 	unsigned int range, unsigned int aref, lsampl_t *data)
 {
@@ -175,6 +177,7 @@ int comedi_data_read(comedi_t *it, unsigned int subdev, unsigned int chan,
 		CR_PACK(chan, range, aref), data, 1);
 }
 
+EXPORT_SYMBOL(comedi_data_read_hint,0.7.19);
 int comedi_data_read_hint(comedi_t *it, unsigned int subdev,
 	unsigned int chan, unsigned int range, unsigned int aref)
 {
@@ -183,6 +186,7 @@ int comedi_data_read_hint(comedi_t *it, unsigned int subdev,
 		CR_PACK(chan, range, aref), &dummy_data, 0);
 }
 
+EXPORT_SYMBOL(comedi_data_read_delayed,0.7.19);
 int comedi_data_read_delayed( comedi_t *it, unsigned int subdev,
 	unsigned int chan, unsigned int range, unsigned int aref,
 	lsampl_t *data, unsigned int nano_sec)
diff --git a/lib/dio.c b/lib/dio.c
index 86b5fa8..37ddc89 100644
--- a/lib/dio.c
+++ b/lib/dio.c
@@ -35,6 +35,7 @@
 #include <libinternal.h>
 
 
+EXPORT_SYMBOL(comedi_dio_config,0.7.18);
 int comedi_dio_config(comedi_t *it,unsigned int subdev,unsigned int chan,unsigned int io)
 {
 	subdevice *s;
@@ -79,6 +80,7 @@ int comedi_dio_config(comedi_t *it,unsigned int subdev,unsigned int chan,unsigne
 	}
 }
 
+EXPORT_SYMBOL(comedi_dio_read,0.7.18);
 int comedi_dio_read(comedi_t *it,unsigned int subdev,unsigned int chan,
 	unsigned int *val)
 {
@@ -129,6 +131,7 @@ int comedi_dio_read(comedi_t *it,unsigned int subdev,unsigned int chan,
 	}
 }
 
+EXPORT_SYMBOL(comedi_dio_write,0.7.18);
 int comedi_dio_write(comedi_t *it,unsigned int subdev,unsigned int chan,
 	unsigned int val)
 {
@@ -174,6 +177,7 @@ int comedi_dio_write(comedi_t *it,unsigned int subdev,unsigned int chan,
 	}
 }
 
+EXPORT_SYMBOL(comedi_dio_bitfield,0.7.18);
 int comedi_dio_bitfield(comedi_t *it,unsigned int subdev,unsigned int mask,unsigned int *bits)
 {
 	int ret;
diff --git a/lib/error.c b/lib/error.c
index 4093f31..a6abcb7 100644
--- a/lib/error.c
+++ b/lib/error.c
@@ -43,6 +43,7 @@ char *__comedilib_error_strings[]={
 int __comedi_loglevel=1;
 int __comedi_errno=0;
 
+EXPORT_SYMBOL(comedi_loglevel,0.7.18);
 int comedi_loglevel(int loglevel)
 {
 	int old_loglevel=__comedi_loglevel;
@@ -52,11 +53,13 @@ int comedi_loglevel(int loglevel)
 	return old_loglevel;
 }
 
+EXPORT_SYMBOL(comedi_errno,0.7.18);
 int comedi_errno(void)
 {
 	return __comedi_errno;
 }
 
+EXPORT_SYMBOL(comedi_strerr,0.7.18);
 char *comedi_strerror(int errnum)
 {
 	if(errnum<COMEDI_NOERROR || errnum>=COMEDI_NOERROR+n_errors)
@@ -65,6 +68,7 @@ char *comedi_strerror(int errnum)
 	return _(__comedilib_error_strings[errnum-COMEDI_NOERROR]);
 }
 
+EXPORT_SYMBOL(comedi_perror,0.7.18);
 void comedi_perror(const char *s)
 {
 	if(__comedi_loglevel>=3){
diff --git a/lib/get.c b/lib/get.c
index 0063a70..082ed36 100644
--- a/lib/get.c
+++ b/lib/get.c
@@ -36,6 +36,7 @@
 #include <libinternal.h>
 
 
+EXPORT_SYMBOL(comedi_get_n_subdevices,0.7.18);
 int comedi_get_n_subdevices(comedi_t *it)
 {
 	if(!valid_dev(it))
@@ -44,6 +45,7 @@ int comedi_get_n_subdevices(comedi_t *it)
 	return it->n_subdevices;
 }
 
+EXPORT_SYMBOL(comedi_get_version_code,0.7.18);
 int comedi_get_version_code(comedi_t *it)
 {
 	if(!valid_dev(it))
@@ -52,6 +54,7 @@ int comedi_get_version_code(comedi_t *it)
 	return it->devinfo.version_code;
 }
 
+EXPORT_SYMBOL(comedi_get_driver_name,0.7.18);
 char *comedi_get_driver_name(comedi_t *it)
 {
 	if(!valid_dev(it))
@@ -60,6 +63,7 @@ char *comedi_get_driver_name(comedi_t *it)
 	return it->devinfo.driver_name;
 }
 
+EXPORT_SYMBOL(comedi_get_board_name,0.7.18);
 char *comedi_get_board_name(comedi_t *it)
 {
 	if(!valid_dev(it))
@@ -68,6 +72,7 @@ char *comedi_get_board_name(comedi_t *it)
 	return it->devinfo.board_name;
 }
 
+EXPORT_SYMBOL(comedi_get_subdevice_flags,0.7.18);
 int comedi_get_subdevice_flags(comedi_t *it,unsigned int subd)
 {
 	if(!valid_dev(it))
@@ -76,6 +81,7 @@ int comedi_get_subdevice_flags(comedi_t *it,unsigned int subd)
 	return it->subdevices[subd].subd_flags;
 }
 
+EXPORT_SYMBOL(comedi_get_subdevice_type,0.7.18);
 int comedi_get_subdevice_type(comedi_t *it,unsigned int subd)
 {
 	if(!valid_dev(it))
@@ -84,6 +90,7 @@ int comedi_get_subdevice_type(comedi_t *it,unsigned int subd)
 	return it->subdevices[subd].type;
 }
 
+EXPORT_SYMBOL(comedi_get_subdevice_type,0.7.18);
 int comedi_find_subdevice_by_type(comedi_t *it,int type,unsigned int subd)
 {
 	if(!valid_subd(it,subd))
@@ -96,6 +103,7 @@ int comedi_find_subdevice_by_type(comedi_t *it,int type,unsigned int subd)
 	return -1;
 }
 
+EXPORT_SYMBOL(comedi_get_read_subdevice,0.7.18);
 int comedi_get_read_subdevice(comedi_t *dev)
 {
 	if(!valid_dev(dev))
@@ -104,6 +112,7 @@ int comedi_get_read_subdevice(comedi_t *dev)
 	return dev->devinfo.read_subdevice;
 }
 
+EXPORT_SYMBOL(comedi_get_write_subdevice,0.7.18);
 int comedi_get_write_subdevice(comedi_t *dev)
 {
 	if(!valid_dev(dev))
@@ -112,6 +121,7 @@ int comedi_get_write_subdevice(comedi_t *dev)
 	return dev->devinfo.write_subdevice;
 }
 
+EXPORT_SYMBOL(comedi_get_n_channels,0.7.18);
 int comedi_get_n_channels(comedi_t *it,unsigned int subd)
 {
 	if(!valid_subd(it,subd))
@@ -123,6 +133,7 @@ int comedi_get_n_channels(comedi_t *it,unsigned int subd)
 
 /* */
 
+EXPORT_SYMBOL(comedi_get_maxdata,0.7.18);
 lsampl_t comedi_get_maxdata(comedi_t *it,unsigned int subdevice,unsigned int chan)
 {
 	if(!valid_chan(it,subdevice,chan))
@@ -134,6 +145,7 @@ lsampl_t comedi_get_maxdata(comedi_t *it,unsigned int subdevice,unsigned int cha
 	return it->subdevices[subdevice].maxdata;
 }
 
+EXPORT_SYMBOL(comedi_maxdata_is_chan_specific,0.7.18);
 int comedi_maxdata_is_chan_specific(comedi_t *it,unsigned int subdevice)
 {
 	if(it->subdevices[subdevice].maxdata_list)
@@ -141,6 +153,7 @@ int comedi_maxdata_is_chan_specific(comedi_t *it,unsigned int subdevice)
 	return 0;
 }
 
+EXPORT_SYMBOL(comedi_get_rangetype,0.7.18);
 int comedi_get_rangetype(comedi_t *it,unsigned int subdevice,unsigned int chan)
 {
 	if(!valid_chan(it,subdevice,chan))
@@ -153,6 +166,7 @@ int comedi_get_rangetype(comedi_t *it,unsigned int subdevice,unsigned int chan)
 }
 
 
+EXPORT_SYMBOL(comedi_get_range,0.7.18);
 comedi_range * comedi_get_range(comedi_t *it,unsigned int subdevice,unsigned int chan,unsigned int range)
 {
 	int range_type;
diff --git a/lib/libinternal.h b/lib/libinternal.h
index 18cd09f..9095ea8 100644
--- a/lib/libinternal.h
+++ b/lib/libinternal.h
@@ -59,6 +59,13 @@
 
 #define COMEDILIB_MAGIC 0xc001dafe
 
+/* handle versioning */
+
+#define EXPORT_SYMBOL(a,b) __asm__(".symver " #a "," #a "@v" #b )
+#define EXPORT_ALIAS_VER(a,b,c) __asm__(".symver " #a "," #b "@v" #c )
+#define EXPORT_ALIAS_DEFAULT(a,b,c) __asm__(".symver " #a "," #b "@@v" #c )
+
+
 extern int __comedi_init;
 extern int __comedi_loglevel;
 extern int __comedi_errno;
diff --git a/lib/range.c b/lib/range.c
index de2b92e..a526d82 100644
--- a/lib/range.c
+++ b/lib/range.c
@@ -51,6 +51,7 @@
 
 static enum comedi_oor_behavior comedi_oor_is_nan = COMEDI_OOR_NAN;
 
+EXPORT_SYMBOL(comedi_set_global_oor_behavior,0.7.18);
 enum comedi_oor_behavior comedi_set_global_oor_behavior(
 	enum comedi_oor_behavior behavior)
 {
@@ -62,6 +63,7 @@ enum comedi_oor_behavior comedi_set_global_oor_behavior(
 }
 
 
+EXPORT_SYMBOL(comedi_to_phys,0.7.18);
 double comedi_to_phys(lsampl_t data,comedi_range *rng,lsampl_t maxdata)
 {
 	double x;
@@ -80,6 +82,7 @@ double comedi_to_phys(lsampl_t data,comedi_range *rng,lsampl_t maxdata)
 	return x;
 }
 
+EXPORT_SYMBOL(comedi_from_phys,0.7.18);
 lsampl_t comedi_from_phys(double data,comedi_range *rng,lsampl_t maxdata)
 {
 	double s;
@@ -94,6 +97,7 @@ lsampl_t comedi_from_phys(double data,comedi_range *rng,lsampl_t maxdata)
 	return (lsampl_t)(floor(s+0.5));
 }
 
+EXPORT_SYMBOL(comedi_find_range,0.7.18);
 int comedi_find_range(comedi_t *it,unsigned int subd,unsigned int chan,unsigned int unit,double min,double max)
 {
 	unsigned int range_type;
@@ -119,6 +123,7 @@ int comedi_find_range(comedi_t *it,unsigned int subd,unsigned int chan,unsigned
 	return best;
 }
 
+EXPORT_SYMBOL(comedi_get_n_ranges,0.7.18);
 int comedi_get_n_ranges(comedi_t *it,unsigned int subd,unsigned int chan)
 {
 	unsigned int range_type;
@@ -129,11 +134,13 @@ int comedi_get_n_ranges(comedi_t *it,unsigned int subd,unsigned int chan)
 	return RANGE_LENGTH(range_type);
 }
 
+EXPORT_SYMBOL(comedi_range_is_chan_specific,0.7.18);
 int comedi_range_is_chan_specific(comedi_t *it,unsigned int subd)
 {
 	return (it->subdevices[subd].subd_flags&SDF_RANGETYPE)?1:0;
 }
 
+EXPORT_SYMBOL(comedi_sampl_to_phys,0.7.19);
 int comedi_sampl_to_phys(double *dest, int dst_stride, sampl_t *src,
 	int src_stride, comedi_range *rng, lsampl_t maxdata, int n)
 {
@@ -170,6 +177,7 @@ int comedi_sampl_to_phys(double *dest, int dst_stride, sampl_t *src,
 	return oor;
 }
 
+EXPORT_SYMBOL(comedi_sampl_from_phys,0.7.19);
 int comedi_sampl_from_phys(sampl_t *dest,int dst_stride,double *src,
 	int src_stride, comedi_range *rng, lsampl_t maxdata, int n)
 {
diff --git a/lib/sv.c b/lib/sv.c
index 6bdb7c4..7d98e01 100644
--- a/lib/sv.c
+++ b/lib/sv.c
@@ -40,7 +40,7 @@
 int sv_measure_l(comedi_sv_t *it,double *data);
 int sv_measure_s(comedi_sv_t *it,double *data);
 
-
+EXPORT_SYMBOL(comedi_sv_init,0.7.18);
 int comedi_sv_init(comedi_sv_t *it,comedi_t *dev,unsigned int subd,unsigned int chan)
 {
 	if(!valid_chan(dev,subd,chan))return -1;
@@ -56,6 +56,7 @@ int comedi_sv_init(comedi_sv_t *it,comedi_t *dev,unsigned int subd,unsigned int
 	return comedi_sv_update(it);
 }
 
+EXPORT_SYMBOL(comedi_sv_update,0.7.18);
 int comedi_sv_update(comedi_sv_t *it)
 {
 	if(!it)return -1;
@@ -69,6 +70,7 @@ int comedi_sv_update(comedi_sv_t *it)
 	return 0;
 }
 
+EXPORT_SYMBOL(comedi_sv_measure,0.7.18);
 int comedi_sv_measure(comedi_sv_t *it,double *data)
 {
 	if(it->dev->subdevices[it->subdevice].subd_flags & SDF_LSAMPL){
diff --git a/lib/timed.c b/lib/timed.c
index 6291fef..befd5b8 100644
--- a/lib/timed.c
+++ b/lib/timed.c
@@ -38,6 +38,7 @@
 
 #define BUFSZ 100
 
+EXPORT_SYMBOL(comedi_timed_1chan,0.7.18);
 int comedi_timed_1chan(comedi_t *dev,unsigned int subd,unsigned int chan,unsigned int range,
 	unsigned int aref,double freq,unsigned int n_samples,double *data)
 {
diff --git a/lib/timer.c b/lib/timer.c
index dc2817e..285cc98 100644
--- a/lib/timer.c
+++ b/lib/timer.c
@@ -142,6 +142,7 @@ static timerfunc timer_functions[]={
 };
 #define N_TIMERTYPES 6
 
+EXPORT_SYMBOL(comedi_get_timer,0.7.18);
 int comedi_get_timer(comedi_t *it,unsigned int subdev,double freq,
 	unsigned int *trigvar,double *actual_freq)
 {
diff --git a/lib/version_script b/lib/version_script
index 9b2c0a7..2f3b360 100644
--- a/lib/version_script
+++ b/lib/version_script
@@ -1,11 +1,20 @@
 
-VERSION{
-
-v0.7.0{
-	global:
-		comedi_*;
+v0.7.18 {
 	local:
-		*;
+		_comedi_*;
+		get_rangeinfo;
+		get_subdevices;
+		initialize;
+		internal_error;
+		libc_error;
+		sv_measure_l;
+		sv_measure_s;
+		valid_chan;
+		valid_dev;
+		valid_subd;
 };
 
-}
+v0.7.19 {
+
+} v0.7.18;
+
-- 
2.26.2