test reading 0 samples

diff --git a/testing/insn_read.c b/testing/insn_read.c
index 0d347ebd8c9b752cc401552af4649f157d72f72e..285cbd4c6d0c3851a86707ff7da39815f0d412d3 100644 (file)
--- a/testing/insn_read.c
+++ b/testing/insn_read.c
@@ -58,3 +58,39 @@ int test_insn_read(void)
        return 0;
 }
 
+/*
+ * This function tests reading with n=0.
+ */
+int test_insn_read_0(void)
+{
+       comedi_insn it;
+       lsampl_t data = 0xffffffff;
+       int ret;
+       int type;
+
+       type = comedi_get_subdevice_type(device,subdevice);
+       if(type==COMEDI_SUBD_UNUSED){
+               printf("not applicable\n");
+               return 0;
+       }
+
+       memset(&it,0,sizeof(it));
+       it.subdev = subdevice;
+       it.insn = INSN_READ;
+       it.n = 0;
+       it.chanspec = CR_PACK(0,0,0);
+       it.data = &data;
+
+       ret = comedi_do_insn(device,&it);
+
+       if(ret<0){
+               printf("E: comedi_do_insn: %s\n",strerror(errno));
+       }else if(ret==0){
+               printf("comedi_do_insn returned 0, good\n");
+       }else{
+               printf("E: comedi_do_insn returned %d\n",ret);
+       }
+
+       return 0;
+}
+

diff --git a/testing/main.c b/testing/main.c
index d6f394537c00085d742f802def014448d9986d94..3f838c4c62b33efb60e55fd692ab187fff6789bc 100644 (file)
--- a/testing/main.c
+++ b/testing/main.c
@@ -26,6 +26,7 @@ int range;
 int test_info(void);
 int test_mode0_read(void);
 int test_insn_read(void);
+int test_insn_read_0(void);
 int test_insn_read_time(void);
 int test_cmd_no_cmd(void);
 int test_cmd_probe_src_mask(void);
@@ -52,6 +53,7 @@ struct test_struct tests[]={
        { "info", test_info, TEST_STD },
        { "mode0_read", test_mode0_read, TEST_NEVER },
        { "insn_read", test_insn_read, TEST_STD },
+       { "insn_read_0", test_insn_read_0, TEST_STD },
        { "insn_read_time", test_insn_read_time, TEST_STD },
        { "cmd_no_cmd", test_cmd_no_cmd, TEST_STD },
        { "cmd_probe_src_mask", test_cmd_probe_src_mask, TEST_STD },