107 lines
2.3 KiB
C
107 lines
2.3 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 <getopt.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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int main(int argc, char **argv);
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int find_mtab_entry(char *name);
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void update_mtab(void);
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void usage(void);
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static char device[PATH_MAX], mount_point[PATH_MAX], type[MNTNAMELEN],
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flags[MNTFLAGLEN];
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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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int umount_flags = 0UL;
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char c;
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char *name;
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while ((c = getopt (argc, argv, "e")) != -1)
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{
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switch (c) {
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case 'e': umount_flags |= MS_EXISTING; break;
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default: break;
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}
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}
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if (argc - optind != 1) {
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usage();
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}
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name = argv[optind];
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found = find_mtab_entry(name);
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if (umount2(name, umount_flags) < 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, mount_point);
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}
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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 e_dev[PATH_MAX], e_mount_point[PATH_MAX], e_type[MNTNAMELEN],
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e_flags[MNTFLAGLEN];
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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(e_dev, e_mount_point, e_type, e_flags);
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if (n < 0) break;
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if (strcmp(name, e_dev) == 0 || (stat(e_mount_point, &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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strlcpy(device, e_dev, PATH_MAX);
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strlcpy(mount_point, e_mount_point, PATH_MAX);
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strlcpy(type, e_type, MNTNAMELEN);
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strlcpy(flags, e_flags, MNTFLAGLEN);
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found = 1;
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break;
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}
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}
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return found;
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}
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void usage()
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{
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std_err("Usage: umount [-e] name\n");
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exit(1);
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}
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