+++ /dev/null
-/*
- * losetup.c - setup and control loop devices
- */
-
-
-#include "internal.h"
-
-const char losetup_usage[] = "losetup\n"
-"\n"
-"\tlosetup loop_device give info\n"
-"\tlosetup -d loop_device delete\n"
-"\tlosetup [ -o offset ] loop_device file setup\n";
-
-/* from mount-2.6d */
-
-/*
- * losetup.c - setup and control loop devices
- */
-
-#include <stdio.h>
-#include <string.h>
-#include <ctype.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <getopt.h>
-#include <errno.h>
-#include <sys/ioctl.h>
-#include <linux/fs.h>
-/* #include "loop.h" */
-
-/*
- * include/linux/loop.h
- *
- * Written by Theodore Ts'o, 3/29/93.
- *
- * Copyright 1993 by Theodore Ts'o. Redistribution of this file is
- * permitted under the GNU Public License.
- */
-
-#define LO_NAME_SIZE 64
-#define LO_KEY_SIZE 32
-
-struct loop_info {
- int lo_number; /* ioctl r/o */
- dev_t lo_device; /* ioctl r/o */
- unsigned long lo_inode; /* ioctl r/o */
- dev_t lo_rdevice; /* ioctl r/o */
- int lo_offset;
- int lo_encrypt_type;
- int lo_encrypt_key_size; /* ioctl w/o */
- int lo_flags; /* ioctl r/o */
- char lo_name[LO_NAME_SIZE];
- unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
- unsigned long lo_init[2];
- char reserved[4];
-};
-
-/*
- * IOCTL commands --- we will commandeer 0x4C ('L')
- */
-
-#define LOOP_SET_FD 0x4C00
-#define LOOP_CLR_FD 0x4C01
-#define LOOP_SET_STATUS 0x4C02
-#define LOOP_GET_STATUS 0x4C03
-
-/* #include "lomount.h" */
-
-extern int set_loop (const char *, const char *, int, int *);
-extern int del_loop (const char *);
-
-static void show_loop(const char *device)
-{
- struct loop_info loopinfo;
- int fd;
-
- if ((fd = open(device, O_RDWR)) < 0) {
- perror(device);
- return;
- }
- if (ioctl(fd, LOOP_GET_STATUS, &loopinfo) < 0) {
- perror("Cannot get loop info");
- close(fd);
- return;
- }
- printf("%s: [%04x]:%ld (%s) offset %d\n",
- device, (unsigned int)loopinfo.lo_device, loopinfo.lo_inode,
- loopinfo.lo_name, loopinfo.lo_offset);
- close(fd);
-}
-
-
-int set_loop(const char *device, const char *file, int offset, int *loopro)
-{
- struct loop_info loopinfo;
- int fd, ffd, mode;
-
- mode = *loopro ? O_RDONLY : O_RDWR;
- if ((ffd = open (file, mode)) < 0 && !*loopro
- && (errno != EROFS || (ffd = open (file, mode = O_RDONLY)) < 0)) {
- perror (file);
- return 1;
- }
- if ((fd = open (device, mode)) < 0) {
- close(ffd);
- perror (device);
- return 1;
- }
- *loopro = (mode == O_RDONLY);
-
- memset(&loopinfo, 0, sizeof(loopinfo));
- strncpy(loopinfo.lo_name, file, LO_NAME_SIZE);
- loopinfo.lo_name[LO_NAME_SIZE-1] = 0;
-
- loopinfo.lo_offset = offset;
-
- loopinfo.lo_encrypt_key_size = 0;
- if (ioctl(fd, LOOP_SET_FD, ffd) < 0) {
- perror("ioctl: LOOP_SET_FD");
- exit(1);
- }
- if (ioctl(fd, LOOP_SET_STATUS, &loopinfo) < 0) {
- (void) ioctl(fd, LOOP_CLR_FD, 0);
- perror("ioctl: LOOP_SET_STATUS");
- exit(1);
- }
- close(fd);
- close(ffd);
- return 0;
-}
-
-int del_loop(const char *device)
-{
- int fd;
-
- if ((fd = open(device, O_RDONLY)) < 0) {
- perror(device);
- exit(1);
- }
- if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
- perror("ioctl: LOOP_CLR_FD");
- exit(1);
- }
- close(fd);
- return(0);
-}
-
-
-static int losetup_usage_fn(void)
-{
- fprintf(stderr, losetup_usage);
- exit(1);
-}
-
-int losetup_main(struct FileInfo * i, int argc, char * * argv)
-{
- char *offset;
- int delete,off,c;
- int ro = 0;
-
- delete = off = 0;
- offset = NULL;
- while ((c = getopt(argc,argv,"do:")) != EOF) {
- switch (c) {
- case 'd':
- delete = 1;
- break;
- case 'o':
- offset = optarg;
- break;
- default:
- losetup_usage_fn();
- }
- }
- if (argc == 1) losetup_usage_fn();
- if ((delete && (argc != optind+1 || offset)) ||
- (!delete && (argc < optind+1 || argc > optind+2)))
- losetup_usage_fn();
- if (argc == optind+1)
- if (delete)
- del_loop(argv[optind]);
- else
- show_loop(argv[optind]);
- else {
- if (offset && sscanf(offset,"%d",&off) != 1)
- losetup_usage_fn();
- set_loop(argv[optind],argv[optind+1],off,&ro);
- }
- return 0;
-}
projects / oweals / busybox.git / commitdiff