111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
/* umount - unmount a file system Author: Andy Tanenbaum */
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#define _MINIX 1 /* for proto of the non-POSIX umount() */
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#define _POSIX_SOURCE 1 /* for PATH_MAX from limits.h */
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#include <minix/type.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <limits.h>
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#include <minix/minlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mount.h>
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#include <stdio.h>
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_PROTOTYPE(int main, (int argc, char **argv));
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_PROTOTYPE(int find_mtab_entry, (char *name));
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_PROTOTYPE(void update_mtab, (void));
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_PROTOTYPE(void usage, (void));
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static char device[PATH_MAX+1], mountpoint[PATH_MAX+1], vs[10], rw[10];
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int main(argc, argv)
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int argc;
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char *argv[];
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{
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int found;
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if (argc != 2) usage();
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found = find_mtab_entry(argv[1]);
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if (umount(argv[1]) < 0) {
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if (errno == EINVAL)
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std_err("umount: Device not mounted\n");
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else if (errno == ENOTBLK)
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std_err("umount: Not a mountpoint\n");
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else
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perror("umount");
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exit(1);
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}
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if (found) {
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printf("%s unmounted from %s\n", device, mountpoint);
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update_mtab();
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}
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else printf("%s unmounted (mtab not updated)\n", argv[1]);
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return(0);
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}
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int find_mtab_entry(name)
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char *name;
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{
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/* Find a matching mtab entry for 'name' which may be a special or a path,
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* and generate a new mtab file without this entry on the fly. Do not write
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* out the result yet. Return whether we found a matching entry.
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*/
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char special[PATH_MAX+1], mounted_on[PATH_MAX+1], version[10], rw_flag[10];
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struct stat nstat, mstat;
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int n, found;
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if (load_mtab("umount") < 0) return 0;
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if (stat(name, &nstat) != 0) return 0;
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found = 0;
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while (1) {
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n = get_mtab_entry(special, mounted_on, version, rw_flag);
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if (n < 0) break;
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if (strcmp(name, special) == 0 || (stat(mounted_on, &mstat) == 0 &&
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mstat.st_dev == nstat.st_dev && mstat.st_ino == nstat.st_ino))
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{
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/* If we found an earlier match, keep that one. Mountpoints
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* may be stacked on top of each other, and unmounting should
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* take place in the reverse order of mounting.
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*/
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if (found) {
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(void) put_mtab_entry(device, mountpoint, vs, rw);
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}
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strcpy(device, special);
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strcpy(mountpoint, mounted_on);
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strcpy(vs, version);
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strcpy(rw, rw_flag);
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found = 1;
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continue;
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}
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(void) put_mtab_entry(special, mounted_on, version, rw_flag);
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}
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return found;
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}
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void update_mtab()
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{
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/* Write out the new mtab file. */
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int n;
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n = rewrite_mtab("umount");
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if (n < 0) {
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std_err("/etc/mtab not updated.\n");
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exit(1);
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}
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}
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void usage()
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{
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std_err("Usage: umount name\n");
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exit(1);
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}
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