diff options
Diffstat (limited to 'ltp_framework/lib/mount_utils.c')
| -rw-r--r-- | ltp_framework/lib/mount_utils.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/ltp_framework/lib/mount_utils.c b/ltp_framework/lib/mount_utils.c new file mode 100644 index 0000000..5a9fd8c --- /dev/null +++ b/ltp_framework/lib/mount_utils.c @@ -0,0 +1,213 @@ +#define _GNU_SOURCE + +#include <sys/types.h> +#include <sys/stat.h> +#include <errno.h> +#include <stdio.h> +#include <mntent.h> +#include <limits.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +/* + * Return the block device for a given path. You must free the string after you + * call this function. + * + * Returns NULL if the device isn't found, memory couldn't be allocated, or if + * the `block device' isn't a real block device (e.g. nfs mounts, etc). + */ +char * +get_block_device(const char *path) +{ + + char *mnt_dir = NULL, *mnt_fsname = NULL; + char *resolved_path = NULL; + FILE *mtab_f; + int done = 0; + struct mntent *entry; + struct stat junk; + + if (path == NULL) { + errno = EINVAL; + } else if ((resolved_path = realpath(path, NULL)) != NULL && + (mtab_f = setmntent("/etc/mtab", "r")) != NULL) + { + + do { + + entry = getmntent(mtab_f); + + if (entry != NULL) { + + if (!strncmp(entry->mnt_dir, resolved_path, strlen(entry->mnt_dir))) { + + char copy_string = 0; + + if (mnt_dir == NULL) { + + mnt_dir = malloc(strlen(entry->mnt_dir)+1); + mnt_fsname = malloc(strlen(entry->mnt_fsname)+1); + + copy_string = mnt_dir != NULL && mnt_fsname != NULL; + + } else { + + if (!strncmp(entry->mnt_dir, mnt_dir, strlen(entry->mnt_dir))) { + + mnt_dir = realloc(mnt_dir, strlen(entry->mnt_dir)); + mnt_fsname = realloc(mnt_fsname, strlen(entry->mnt_fsname)); + copy_string = 1; + + } + + } + + if (copy_string != 0) { + strcpy(mnt_dir, entry->mnt_dir); + strcpy(mnt_fsname, entry->mnt_fsname); +#if DEBUG + printf("%s is a subset of %s\n", path, entry->mnt_dir); + } else { + printf("%s is not a subset of %s\n", path, entry->mnt_dir); +#endif + } + +#if DEBUG + } else { + printf("%s is not a subset of %s\n", path, entry->mnt_dir); +#endif + } + + } + + } while (done == 0 && entry != NULL); + + endmntent(mtab_f); + + } + + if (mnt_dir != NULL) { + free(mnt_dir); + } + if (resolved_path != NULL) { + free(resolved_path); + } + + if (mnt_fsname != NULL && stat(mnt_fsname, &junk) < 0 && + errno == ENOENT) { + free(mnt_fsname); + mnt_fsname = NULL; + errno = ENODEV; + } + + return mnt_fsname; + +} + +/* + * Return the mountpoint for a given path. You must free the string after you + * call this function. + * + * Returns NULL if memory couldn't be allocated. + */ +char * +get_mountpoint(const char *path) +{ + + char *mnt_dir = NULL; + char *resolved_path = NULL; + FILE *mtab_f; + int done = 0; + struct mntent *entry; + + if (path == NULL) { + errno = EINVAL; + } else if ((resolved_path = realpath(path, NULL)) != NULL && + (mtab_f = setmntent("/etc/mtab", "r")) != NULL) + { + + do { + + entry = getmntent(mtab_f); + + if (entry != NULL) { + + if (!strncmp(entry->mnt_dir, resolved_path, strlen(entry->mnt_dir))) { + + char copy_string = 0; + + if (mnt_dir == NULL) { + + mnt_dir = malloc(strlen(entry->mnt_dir)+1); + copy_string = mnt_dir != NULL; + + } else { + + if (!strncmp(entry->mnt_dir, mnt_dir, strlen(entry->mnt_dir))) { + + mnt_dir = realloc(mnt_dir, strlen(entry->mnt_dir)); + copy_string = 1; + + } + + } + + if (copy_string != 0) { + strcpy(mnt_dir, entry->mnt_dir); +#if DEBUG + printf("%s is a subset of %s\n", path, entry->mnt_dir); + } else { + printf("%s is not a subset of %s\n", path, entry->mnt_dir); +#endif + } + +#if DEBUG + } else { + printf("%s is not a subset of %s\n", path, entry->mnt_dir); +#endif + } + + } + + } while (done == 0 && entry != NULL); + + endmntent(mtab_f); + + } + + if (resolved_path != NULL) { + free(resolved_path); + } + + return mnt_dir; + +} +#if UNIT_TEST +int +main(void) +{ + + char *mnt_fsname; + char *paths[] = { + "/home", + "/mnt", + "/tmp/foo", /* mkdir /tmp/foo; mount -t tmpfs none /tmp/foo/ */ + "/proc", + "/optimus/store" + }; + int i; + + for (i = 0; i < sizeof(paths) / sizeof(*paths); i++) { + mnt_fsname = get_block_device(paths[i]); + printf("%s - %s\n", paths[i], mnt_fsname); + if (mnt_fsname != NULL) { + free(mnt_fsname); + mnt_fsname = NULL; + } + } + + return 0; + +} +#endif
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