I_LIST ioctl(2)Example

The I_LIST ioctl(2) lists the drivers and module in a stream.

Example 8–13 List a Stream's Drivers and Modules

#include <stdio.h>
#include <string.h>
#include <stropts.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/socket.h>

main(int argc, const char **argv)
{
		int               s, i;
		int               mods;
		struct str_list   mod_list;
		struct str_mlist *mlist;

		/* Get a socket... */
		if((s = socket(AF_INET, SOCK_STREAM, 0)) <= 0) {
			perror("socket: ");
			exit(1);
		}

		/* Determine the number of modules in the stream. */
		if((mods = ioctl(s, I_LIST, 0)) < 0){
			perror("I_LIST ioctl");
		}
		if(mods == 0) {
			printf("No modules\n");
			exit(1);
		} else {
			printf("%d modules\n", mods);
		}
		/* Allocate memory for all of the module names... */
		mlist = (struct str_mlist *) calloc(mods, sizeof(struct str_mlist));
		if(mlist == 0){
			perror("malloc failure");
			exit(1);
		}
		mod_list.sl_modlist = mlist;
		mod_list.sl_nmods = mods;

		/* Do the ioctl and get the module names. */
		if(ioctl(s, I_LIST, &mod_list) < 0){
			perror("I_LIST ioctl fetch");
			exit(1);
		}

		/* Print out the name of the modules */
		for(i = 0; i < mods; i++) {
			printf("s: %s\n", mod_list.sl_modlist[i].l_name);
		}

		free(mlist);

		exit(0);
}