| 1 | static char *sccsid = "@(#)umount.c 4.5 (Berkeley) %G%"; |
| 2 | |
| 3 | #include <stdio.h> |
| 4 | #include <fstab.h> |
| 5 | |
| 6 | /* |
| 7 | * umount |
| 8 | */ |
| 9 | |
| 10 | #define NMOUNT 16 |
| 11 | #define NAMSIZ 32 |
| 12 | |
| 13 | struct mtab { |
| 14 | char file[NAMSIZ]; |
| 15 | char spec[NAMSIZ]; |
| 16 | } mtab[NMOUNT]; |
| 17 | |
| 18 | char *rindex(); |
| 19 | int vflag, all, errs; |
| 20 | |
| 21 | main(argc, argv) |
| 22 | int argc; |
| 23 | char **argv; |
| 24 | { |
| 25 | register struct mtab *mp; |
| 26 | register char *p1, *p2; |
| 27 | int mf; |
| 28 | |
| 29 | argc--, argv++; |
| 30 | sync(); |
| 31 | mf = open("/etc/mtab", 0); |
| 32 | read(mf, (char *)mtab, sizeof (mtab)); |
| 33 | again: |
| 34 | if (!strcmp(*argv, "-v")) { |
| 35 | vflag++; |
| 36 | argc--, argv++; |
| 37 | goto again; |
| 38 | } |
| 39 | if (!strcmp(*argv, "-a")) { |
| 40 | all++; |
| 41 | argc--, argv++; |
| 42 | goto again; |
| 43 | } |
| 44 | if (argc == 0 && !all) { |
| 45 | fprintf(stderr, "Usage: umount [ -a ] [ -v ] [ dev ... ]\n"); |
| 46 | exit(1); |
| 47 | } |
| 48 | if (all) { |
| 49 | if (setfsent() == 0) |
| 50 | perror(FSTAB), exit(1); |
| 51 | umountall(); |
| 52 | exit(0); |
| 53 | } |
| 54 | while (argc > 0) { |
| 55 | if (umountfs(*argv++) == 0) |
| 56 | errs++; |
| 57 | argc--; |
| 58 | } |
| 59 | exit(errs); |
| 60 | } |
| 61 | |
| 62 | umountall() |
| 63 | { |
| 64 | struct fstab fs, *fsp; |
| 65 | |
| 66 | if ((fsp = getfsent()) == 0) |
| 67 | return; |
| 68 | fs = *fsp; /* save info locally; it is static from getfsent() */ |
| 69 | umountall(); |
| 70 | if (strcmp(fs.fs_file, "/") == 0) |
| 71 | return; |
| 72 | if (strcmp(fs.fs_type, FSTAB_RW) && strcmp(fs.fs_type, FSTAB_RO)) |
| 73 | return; |
| 74 | if (umountfs(fs.fs_spec) < 0) { |
| 75 | perror(fs.fs_spec); |
| 76 | return; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | struct mtab zeromtab; |
| 81 | |
| 82 | umountfs(name) |
| 83 | char *name; |
| 84 | { |
| 85 | register char *p1, *p2; |
| 86 | register struct mtab *mp; |
| 87 | int mf; |
| 88 | |
| 89 | if (unmount(name) < 0) { |
| 90 | perror(name); |
| 91 | return (0); |
| 92 | } |
| 93 | if (vflag) |
| 94 | fprintf(stderr, "%s: Unmounted\n", name); |
| 95 | while ((p1 = rindex(name, '/')) && p1[1] == 0) |
| 96 | *p1 = 0; |
| 97 | if (p1) |
| 98 | name = p1 + 1; |
| 99 | for (mp = mtab; mp < &mtab[NMOUNT]; mp++) { |
| 100 | if (strncmp(mp->spec, name, sizeof (mp->spec))) |
| 101 | continue; |
| 102 | *mp = zeromtab; |
| 103 | for (mp = &mtab[NMOUNT]; mp >= mtab; mp--) |
| 104 | if (mp->file[0]) |
| 105 | break; |
| 106 | mp++; |
| 107 | mf = creat("/etc/mtab", 0644); |
| 108 | write(mf, (char *)mtab, (mp-mtab) * sizeof (struct mtab)); |
| 109 | return (1); |
| 110 | } |
| 111 | fprintf(stderr, "%s: Not mounted\n", name); |
| 112 | return (0); |
| 113 | } |