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