Listing 3 Listing CD-ROM drives

 1 /* Compile with gcc -g -o listcds listcds.c -ldevinfo */
 2 #include <stdio.h>
 3 #include <ftw.h>
 4 #include <libdevinfo.h>
 5
 6 di_minor_t srchminor;
 7
 8 int showpath(const char *fname,  const struct stat *statbuf, int type) {
 9    if (statbuf->st_rdev == di_minor_devt(srchminor)) {
10       printf("%s\n", fname);
11       return(1);
12    }
13    return(0);
14 }
15
16 int checknode(di_node_t node, void *dummy) {
17    di_minor_t minor = DI_MINOR_NIL;
18    char *path;
19
20    /* Check if any of the minor nodes are CD-ROMs            */
21    while ((minor = di_minor_next(node, minor)) != DI_MINOR_NIL) {
22       if (di_minor_nodetype(minor) &&
23           ((!strcmp(di_minor_nodetype(minor), DDI_NT_CD) ||
24            (!strcmp(di_minor_nodetype(minor), DDI_NT_CD_CHAN))))) {
25          srchminor = minor;
26          if (ftw("/dev", &showpath, 10) == 0) {
27             printf("/devices%s:%s\n",
28                    path = di_devfs_path(node), di_minor_name(minor));
29             di_devfs_path_free(path);
30          }
31          break;
32       }
33    }
34
35    return(DI_WALK_CONTINUE);
36 }
37
38 int main() {
39    di_node_t tRootNode;
40
41    if ((tRootNode = di_init("/", DINFOCPYALL)) == DI_NODE_NIL) {
42       perror("Failed to get root node");
43       return(1);
44    }
45
46    /* Examine all nodes */
47    di_walk_node(tRootNode, DI_WALK_CLDFIRST, NULL, &checknode);
48
49    di_fini(tRootNode);
50
51    return(0);
52 }