136 lines
2.7 KiB
C
136 lines
2.7 KiB
C
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#include "internal.h"
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <mntent.h>
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#include <sys/mount.h>
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const char umount_usage[] = "umount {filesystem|directory}\n"
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"\tumount -a\n"
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"\n"
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"\tUnmount a filesystem.\n"
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"\t-a:\tUnmounts all mounted filesystems.\n";
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static char *
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stralloc(const char * string)
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{
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int length = strlen(string) + 1;
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char * n = malloc(length);
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memcpy(n, string, length);
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return n;
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}
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extern void
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erase_mtab(const char * name)
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{
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struct mntent entries[100];
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int count = 0;
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FILE * mountTable = setmntent("/etc/mtab", "r");
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struct mntent * m;
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if ( mountTable == 0
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&& (mountTable = setmntent("/proc/mounts", "r")) == 0 ) {
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name_and_error("/etc/mtab");
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return;
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}
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while ( (m = getmntent(mountTable)) != 0 ) {
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entries[count].mnt_fsname = stralloc(m->mnt_fsname);
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entries[count].mnt_dir = stralloc(m->mnt_dir);
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entries[count].mnt_type = stralloc(m->mnt_type);
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entries[count].mnt_opts = stralloc(m->mnt_opts);
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entries[count].mnt_freq = m->mnt_freq;
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entries[count].mnt_passno = m->mnt_passno;
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count++;
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}
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endmntent(mountTable);
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if ( (mountTable = setmntent("/etc/mtab", "w")) ) {
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int i;
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for ( i = 0; i < count; i++ ) {
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int result = ( strcmp(entries[i].mnt_fsname, name) == 0
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|| strcmp(entries[i].mnt_dir, name) == 0 );
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if ( result )
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continue;
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else
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addmntent(mountTable, &entries[i]);
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}
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endmntent(mountTable);
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}
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else if ( errno != EROFS )
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name_and_error("/etc/mtab");
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}
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static int
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umount_all(int noMtab)
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{
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struct mntent entries[100];
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int count = 0;
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FILE * mountTable = setmntent("/etc/mtab", "r");
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struct mntent * m;
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int status = 0;
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if ( mountTable == 0
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&& (mountTable = setmntent("/proc/mounts", "r")) == 0 ) {
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name_and_error("/etc/mtab");
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return 1;
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}
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while ( (m = getmntent(mountTable)) != 0 ) {
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entries[count].mnt_fsname = stralloc(m->mnt_fsname);
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count++;
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}
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endmntent(mountTable);
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while ( count > 0 ) {
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int result = umount(entries[--count].mnt_fsname) == 0;
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/* free(entries[count].mnt_fsname); */
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if ( result ) {
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if ( !noMtab )
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erase_mtab(entries[count].mnt_fsname);
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}
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else {
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status = 1;
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name_and_error(entries[count].mnt_fsname);
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}
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}
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return status;
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}
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extern int
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do_umount(const char * name, int noMtab)
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{
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if ( umount(name) == 0 ) {
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if ( !noMtab )
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erase_mtab(name);
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return 0;
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}
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return 1;
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}
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extern int
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umount_main(struct FileInfo * i, int argc, char * * argv)
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{
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int noMtab = 0;
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if ( argv[1][0] == '-' ) {
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switch ( argv[1][1] ) {
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case 'a':
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return umount_all(noMtab);
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case 'n':
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noMtab = 1;
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break;
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default:
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usage(umount_usage);
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return 1;
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}
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}
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if ( do_umount(argv[1],noMtab) != 0 ) {
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fprintf(stderr, "%s: %s.\n", argv[1], strerror(errno));
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return 1;
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}
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return 0;
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}
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