[Intel-gfx] [PATCH igt v3] lib: Add simple sysfs accessors

[Chris Wilson]

On Fri, May 27, 2016 at 08:46:14PM +0300, Ville Syrjälä wrote:
> > +	for (int n = 0; n < 16; n++) {
> > +		int len = sprintf(path, "/sys/class/drm/card%d", n);
> > +		if (device[0]) {
> > +			char tmp[80];
> > +			int ret;
> > +
> > +			sprintf(path + len, "/dev");
> > +			fd = open(path, O_RDONLY);
> > +			if (fd == -1)
> > +				continue;
> > +
> > +			ret = read(fd, tmp, sizeof(tmp-1));
> > +			if (ret < 0)
> > +				ret = 0;
> > +			tmp[ret] = '\0';
> > +			while (ret > 0 && tmp[ret-1] == '\n')
> > +				tmp[--ret] = '\0';
> > +			close(fd);
> > +
> > +			if (strcmp(tmp, device))
> > +				continue;
> 
> fscanf?

                if (fd != -1) {
                        FILE *file;
                        int ret, maj, min;

                        sprintf(path + len, "/dev");
                        file = fopen(path, "r");
                        if (!file)
                                continue;

                        ret = fscanf(file, "%d:%d", &maj, &min);
                        fclose(file);

                        if (ret != 2 ||
                            major(st.st_rdev) != maj ||
                            minor(st.st_rdev) != min)
                                continue;

-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre