93 lines
1.8 KiB
C
93 lines
1.8 KiB
C
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/* 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 <sys/types.h>
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#include <sys/svrctl.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 <stdio.h>
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_PROTOTYPE(int main, (int argc, char **argv));
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_PROTOTYPE(void update_mtab, (char *devname));
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_PROTOTYPE(void usage, (void));
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_PROTOTYPE(void tell, (char *this));
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static char mountpoint[PATH_MAX+1];
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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 sflag = 0;
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while (argc > 1 && argv[1][0] == '-') {
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char *opt = argv[1]+1;
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while (*opt) if (*opt++ == 's') sflag = 1; else usage();
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argc--;
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argv++;
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}
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if (argc != 2) usage();
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if ((sflag ? svrctl(MMSWAPOFF, NULL) : umount(argv[1])) < 0) {
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if (errno == EINVAL)
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std_err("Device not mounted\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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update_mtab(argv[1]);
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tell(argv[1]);
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tell(" unmounted");
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if (*mountpoint != '\0') {
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tell(" from ");
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tell(mountpoint);
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}
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tell("\n");
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return(0);
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}
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void update_mtab(devname)
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char *devname;
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{
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/* Remove an entry from /etc/mtab. */
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int n;
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char special[PATH_MAX+1], mounted_on[PATH_MAX+1], version[10], rw_flag[10];
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if (load_mtab("umount") < 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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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(devname, special) == 0) {
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strcpy(mountpoint, mounted_on);
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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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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 [-s] special\n");
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exit(1);
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}
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void tell(this)
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char *this;
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{
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write(1, this, strlen(this));
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}
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