/* vi: set sw=4 ts=4: */ /* * Utility routines. * * Copyright (C) 1999-2004 by Erik Andersen * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ #include "libbb.h" #include /* * Given a block device, find the mount table entry if that block device * is mounted. * * Given any other file (or directory), find the mount table entry for its * filesystem. */ struct mntent* FAST_FUNC find_mount_point(const char *name, int subdir_too) { struct stat s; struct mntent *mountEntry; #if !ENABLE_PLATFORM_MINGW32 FILE *mtab_fp; dev_t devno_of_name; bool block_dev; #else static char mnt_fsname[4]; static char mnt_dir[4]; static char mnt_type[1]; static char mnt_opts[1]; static struct mntent my_mount_entry = { mnt_fsname, mnt_dir, mnt_type, mnt_opts, 0, 0 }; char *current; const char *path; DWORD len; #endif if (stat(name, &s) != 0) return NULL; #if !ENABLE_PLATFORM_MINGW32 devno_of_name = s.st_dev; block_dev = 0; /* Why S_ISCHR? - UBI volumes use char devices, not block */ if (S_ISBLK(s.st_mode) || S_ISCHR(s.st_mode)) { devno_of_name = s.st_rdev; block_dev = 1; } mtab_fp = setmntent(bb_path_mtab_file, "r"); if (!mtab_fp) return NULL; while ((mountEntry = getmntent(mtab_fp)) != NULL) { /* rootfs mount in Linux 2.6 exists always, * and it makes sense to always ignore it. * Otherwise people can't reference their "real" root! */ if (ENABLE_FEATURE_SKIP_ROOTFS && strcmp(mountEntry->mnt_fsname, "rootfs") == 0) continue; if (strcmp(name, mountEntry->mnt_dir) == 0 || strcmp(name, mountEntry->mnt_fsname) == 0 ) { /* String match. */ break; } if (!(subdir_too || block_dev)) continue; /* Is device's dev_t == name's dev_t? */ if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == devno_of_name) break; /* Match the directory's mount point. */ if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == devno_of_name) break; } endmntent(mtab_fp); #else mountEntry = NULL; path = NULL; current = NULL; if ( isalpha(name[0]) && name[1] == ':' ) { path = name; } else { if ( (len=GetCurrentDirectory(0, NULL)) > 0 && (current=malloc(len+1)) != NULL && GetCurrentDirectory(len, current) ) { path = current; } } if ( path && isalpha(path[0]) && path[1] == ':' ) { mnt_fsname[0] = path[0]; mnt_fsname[1] = path[1]; mnt_fsname[2] = '\0'; mnt_dir[0] = path[0]; mnt_dir[1] = path[1]; mnt_dir[2] = '\\'; mnt_dir[3] = '\0'; mountEntry = &my_mount_entry; } free(current); #endif return mountEntry; }