93 lines
1.8 KiB
C
Executable file
93 lines
1.8 KiB
C
Executable file
/* umount - unmount a file system Author: Andy Tanenbaum */
|
|
|
|
#define _MINIX 1 /* for proto of the non-POSIX umount() */
|
|
#define _POSIX_SOURCE 1 /* for PATH_MAX from limits.h */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/svrctl.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
#include <limits.h>
|
|
#include <minix/minlib.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
|
|
_PROTOTYPE(int main, (int argc, char **argv));
|
|
_PROTOTYPE(void update_mtab, (char *devname));
|
|
_PROTOTYPE(void usage, (void));
|
|
_PROTOTYPE(void tell, (char *this));
|
|
|
|
static char mountpoint[PATH_MAX+1];
|
|
|
|
int main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
int sflag = 0;
|
|
|
|
while (argc > 1 && argv[1][0] == '-') {
|
|
char *opt = argv[1]+1;
|
|
while (*opt) if (*opt++ == 's') sflag = 1; else usage();
|
|
argc--;
|
|
argv++;
|
|
}
|
|
if (argc != 2) usage();
|
|
if ((sflag ? svrctl(MMSWAPOFF, NULL) : umount(argv[1])) < 0) {
|
|
if (errno == EINVAL)
|
|
std_err("Device not mounted\n");
|
|
else
|
|
perror("umount");
|
|
exit(1);
|
|
}
|
|
update_mtab(argv[1]);
|
|
tell(argv[1]);
|
|
tell(" unmounted");
|
|
if (*mountpoint != '\0') {
|
|
tell(" from ");
|
|
tell(mountpoint);
|
|
}
|
|
tell("\n");
|
|
return(0);
|
|
}
|
|
|
|
void update_mtab(devname)
|
|
char *devname;
|
|
{
|
|
/* Remove an entry from /etc/mtab. */
|
|
int n;
|
|
char special[PATH_MAX+1], mounted_on[PATH_MAX+1], version[10], rw_flag[10];
|
|
|
|
if (load_mtab("umount") < 0) {
|
|
std_err("/etc/mtab not updated.\n");
|
|
exit(1);
|
|
}
|
|
while (1) {
|
|
n = get_mtab_entry(special, mounted_on, version, rw_flag);
|
|
if (n < 0) break;
|
|
if (strcmp(devname, special) == 0) {
|
|
strcpy(mountpoint, mounted_on);
|
|
continue;
|
|
}
|
|
(void) put_mtab_entry(special, mounted_on, version, rw_flag);
|
|
}
|
|
n = rewrite_mtab("umount");
|
|
if (n < 0) {
|
|
std_err("/etc/mtab not updated.\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
void usage()
|
|
{
|
|
std_err("Usage: umount [-s] special\n");
|
|
exit(1);
|
|
}
|
|
|
|
void tell(this)
|
|
char *this;
|
|
{
|
|
write(1, this, strlen(this));
|
|
}
|