| Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame^] | 1 | #include "internal.h" |
| 2 | #include <stdlib.h> |
| 3 | #include <unistd.h> |
| 4 | #include <errno.h> |
| 5 | #include <string.h> |
| 6 | #include <stdio.h> |
| 7 | #include <mntent.h> |
| 8 | #include <sys/mount.h> |
| 9 | |
| 10 | const char umount_usage[] = "umount {filesystem|directory}\n" |
| 11 | "\tumount -a\n" |
| 12 | "\n" |
| 13 | "\tUnmount a filesystem.\n" |
| 14 | "\t-a:\tUnmounts all mounted filesystems.\n"; |
| 15 | |
| 16 | static char * |
| 17 | stralloc(const char * string) |
| 18 | { |
| 19 | int length = strlen(string) + 1; |
| 20 | char * n = malloc(length); |
| 21 | memcpy(n, string, length); |
| 22 | return n; |
| 23 | } |
| 24 | |
| 25 | extern void |
| 26 | erase_mtab(const char * name) |
| 27 | { |
| 28 | struct mntent entries[100]; |
| 29 | int count = 0; |
| 30 | FILE * mountTable = setmntent("/etc/mtab", "r"); |
| 31 | struct mntent * m; |
| 32 | |
| 33 | if ( mountTable == 0 |
| 34 | && (mountTable = setmntent("/proc/mounts", "r")) == 0 ) { |
| 35 | name_and_error("/etc/mtab"); |
| 36 | return; |
| 37 | } |
| 38 | |
| 39 | while ( (m = getmntent(mountTable)) != 0 ) { |
| 40 | entries[count].mnt_fsname = stralloc(m->mnt_fsname); |
| 41 | entries[count].mnt_dir = stralloc(m->mnt_dir); |
| 42 | entries[count].mnt_type = stralloc(m->mnt_type); |
| 43 | entries[count].mnt_opts = stralloc(m->mnt_opts); |
| 44 | entries[count].mnt_freq = m->mnt_freq; |
| 45 | entries[count].mnt_passno = m->mnt_passno; |
| 46 | count++; |
| 47 | } |
| 48 | endmntent(mountTable); |
| 49 | if ( (mountTable = setmntent("/etc/mtab", "w")) ) { |
| 50 | int i; |
| 51 | for ( i = 0; i < count; i++ ) { |
| 52 | int result = ( strcmp(entries[i].mnt_fsname, name) == 0 |
| 53 | || strcmp(entries[i].mnt_dir, name) == 0 ); |
| 54 | |
| 55 | if ( result ) |
| 56 | continue; |
| 57 | else |
| 58 | addmntent(mountTable, &entries[i]); |
| 59 | } |
| 60 | endmntent(mountTable); |
| 61 | } |
| 62 | else if ( errno != EROFS ) |
| 63 | name_and_error("/etc/mtab"); |
| 64 | } |
| 65 | |
| 66 | static int |
| 67 | umount_all(int noMtab) |
| 68 | { |
| 69 | struct mntent entries[100]; |
| 70 | int count = 0; |
| 71 | FILE * mountTable = setmntent("/etc/mtab", "r"); |
| 72 | struct mntent * m; |
| 73 | int status = 0; |
| 74 | |
| 75 | if ( mountTable == 0 |
| 76 | && (mountTable = setmntent("/proc/mounts", "r")) == 0 ) { |
| 77 | name_and_error("/etc/mtab"); |
| 78 | return 1; |
| 79 | } |
| 80 | |
| 81 | while ( (m = getmntent(mountTable)) != 0 ) { |
| 82 | entries[count].mnt_fsname = stralloc(m->mnt_fsname); |
| 83 | count++; |
| 84 | } |
| 85 | endmntent(mountTable); |
| 86 | |
| 87 | while ( count > 0 ) { |
| 88 | int result = umount(entries[--count].mnt_fsname) == 0; |
| 89 | /* free(entries[count].mnt_fsname); */ |
| 90 | if ( result ) { |
| 91 | if ( !noMtab ) |
| 92 | erase_mtab(entries[count].mnt_fsname); |
| 93 | } |
| 94 | else { |
| 95 | status = 1; |
| 96 | name_and_error(entries[count].mnt_fsname); |
| 97 | } |
| 98 | } |
| 99 | return status; |
| 100 | } |
| 101 | |
| 102 | extern int |
| 103 | do_umount(const char * name, int noMtab) |
| 104 | { |
| 105 | if ( umount(name) == 0 ) { |
| 106 | if ( !noMtab ) |
| 107 | erase_mtab(name); |
| 108 | return 0; |
| 109 | } |
| 110 | return 1; |
| 111 | } |
| 112 | |
| 113 | extern int |
| 114 | umount_main(struct FileInfo * i, int argc, char * * argv) |
| 115 | { |
| 116 | int noMtab = 0; |
| 117 | |
| 118 | if ( argv[1][0] == '-' ) { |
| 119 | switch ( argv[1][1] ) { |
| 120 | case 'a': |
| 121 | return umount_all(noMtab); |
| 122 | case 'n': |
| 123 | noMtab = 1; |
| 124 | break; |
| 125 | default: |
| 126 | usage(umount_usage); |
| 127 | return 1; |
| 128 | } |
| 129 | } |
| 130 | if ( do_umount(argv[1],noMtab) != 0 ) { |
| 131 | fprintf(stderr, "%s: %s.\n", argv[1], strerror(errno)); |
| 132 | return 1; |
| 133 | } |
| 134 | return 0; |
| 135 | } |