made error message on failure to open device more informative

diff --git a/comedi_calibrate/comedi_calibrate.c b/comedi_calibrate/comedi_calibrate.c
index 91c670066bae40ca9846a1d1d29e9cb615fff196..2612b60a14a10b5999f24c3131a9703ac3bb2984 100644 (file)
--- a/comedi_calibrate/comedi_calibrate.c
+++ b/comedi_calibrate/comedi_calibrate.c
@@ -170,7 +170,8 @@ int main(int argc, char *argv[])
 
        dev = comedi_open(fn);
        if (dev == NULL ) {
-               perror(fn);
+               fprintf( stderr, "comedi_open() failed, with device file name: %s\n", fn );
+               comedi_perror("comedi_open");
                exit(0);
        }
 
@@ -763,7 +764,7 @@ double check_gain_chan_x( calibration_setup_t *setup, linear_fit_t *l,unsigned i
        l->y_data=malloc(n*sizeof(double)/step);
        if(l->y_data == NULL)
        {
-               perror("check_gain_chan_x");
+               perror( __FUNCTION__ );
                exit(1);
        }
 
@@ -834,7 +835,7 @@ double check_gain_chan_fine( calibration_setup_t *setup, linear_fit_t *l,unsigne
        l->y_data=malloc(n*sizeof(double)/step);
        if(l->y_data == NULL)
        {
-               perror("comedi_calibrate");
+               perror( __FUNCTION__ );
                exit(1);
        }
 
@@ -1042,7 +1043,7 @@ int new_sv_measure( comedi_t *dev, new_sv_t *sv)
        data=malloc(sizeof(lsampl_t)*n);
        if(data == NULL)
        {
-               perror("comedi_calibrate");
+               perror( __FUNCTION__ );
                exit(1);
        }
 
@@ -1090,7 +1091,7 @@ int new_sv_measure_order( comedi_t *dev, new_sv_t *sv,int order)
        data=malloc(sizeof(lsampl_t)*n);
        if(data == NULL)
        {
-               perror("comedi_calibrate");
+               perror( __FUNCTION__ );
                exit(1);
        }