diff options
Diffstat (limited to 'busybox/libbb/mtab.c')
| -rw-r--r-- | busybox/libbb/mtab.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/busybox/libbb/mtab.c b/busybox/libbb/mtab.c new file mode 100644 index 0000000..b1f74c4 --- /dev/null +++ b/busybox/libbb/mtab.c @@ -0,0 +1,116 @@ +/* vi: set sw=4 ts=4: */ +/* + * Utility routines. + * + * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <stdlib.h> +#include <unistd.h> +#include <errno.h> +#include <string.h> +#include <stdio.h> +#include <mntent.h> +#include "libbb.h" + +#define MTAB_MAX_ENTRIES 40 +static const int MS_RDONLY = 1; /* Mount read-only. */ + +void erase_mtab(const char *name) +{ + struct mntent entries[MTAB_MAX_ENTRIES]; + int count = 0; + FILE *mountTable = setmntent(bb_path_mtab_file, "r"); + struct mntent *m; + + /* Check if reading the mtab file failed */ + if (mountTable == 0 + /* Bummer. fall back on trying the /proc filesystem */ + && (mountTable = setmntent("/proc/mounts", "r")) == 0) { + bb_perror_msg(bb_path_mtab_file); + return; + } + + while (((m = getmntent(mountTable)) != 0) && (count < MTAB_MAX_ENTRIES)) + { + entries[count].mnt_fsname = strdup(m->mnt_fsname); + entries[count].mnt_dir = strdup(m->mnt_dir); + entries[count].mnt_type = strdup(m->mnt_type); + entries[count].mnt_opts = strdup(m->mnt_opts); + entries[count].mnt_freq = m->mnt_freq; + entries[count].mnt_passno = m->mnt_passno; + count++; + } + endmntent(mountTable); + if ((mountTable = setmntent(bb_path_mtab_file, "w"))) { + int i; + + for (i = 0; i < count; i++) { + int result = (strcmp(entries[i].mnt_fsname, name) == 0 + || strcmp(entries[i].mnt_dir, name) == 0); + + if (result) + continue; + else + addmntent(mountTable, &entries[i]); + } + endmntent(mountTable); + } else if (errno != EROFS) + bb_perror_msg(bb_path_mtab_file); +} + +void write_mtab(char *blockDevice, char *directory, + char *filesystemType, long flags, char *string_flags) +{ + FILE *mountTable = setmntent(bb_path_mtab_file, "a+"); + struct mntent m; + + if (mountTable == 0) { + bb_perror_msg(bb_path_mtab_file); + return; + } + if (mountTable) { + int length = strlen(directory); + + if (length > 1 && directory[length - 1] == '/') + directory[length - 1] = '\0'; + + if (filesystemType == 0) { + struct mntent *p = find_mount_point(blockDevice, "/proc/mounts"); + + if (p && p->mnt_type) + filesystemType = p->mnt_type; + } + m.mnt_fsname = blockDevice; + m.mnt_dir = directory; + m.mnt_type = filesystemType ? filesystemType : "default"; + + if (*string_flags) { + m.mnt_opts = string_flags; + } else { + if ((flags | MS_RDONLY) == flags) + m.mnt_opts = "ro"; + else + m.mnt_opts = "rw"; + } + + m.mnt_freq = 0; + m.mnt_passno = 0; + addmntent(mountTable, &m); + endmntent(mountTable); + } +} |