1 static char *sccsid = "@(#)umount.c 4.4 (Berkeley) 02/28/82"; 2 3 #include <stdio.h> 4 #include <fstab.h> 5 6 /* 7 * umount 8 */ 9 10 #define NMOUNT 16 11 #define NAMSIZ 32 12 13 struct mtab { 14 char file[NAMSIZ]; 15 char spec[NAMSIZ]; 16 } mtab[NMOUNT]; 17 18 char *rindex(); 19 int vflag, all, errs; 20 21 main(argc, argv) 22 int argc; 23 char **argv; 24 { 25 register struct mtab *mp; 26 register char *p1, *p2; 27 int mf; 28 29 argc--, argv++; 30 sync(); 31 mf = open("/etc/mtab", 0); 32 read(mf, (char *)mtab, sizeof (mtab)); 33 again: 34 if (!strcmp(*argv, "-v")) { 35 vflag++; 36 argc--, argv++; 37 goto again; 38 } 39 if (!strcmp(*argv, "-a")) { 40 all++; 41 argc--, argv++; 42 goto again; 43 } 44 if (argc == 0 && !all) { 45 fprintf(stderr, "Usage: umount [ -a ] [ -v ] [ dev ... ]\n"); 46 exit(1); 47 } 48 if (all) { 49 if (setfsent() == 0) 50 perror(FSTAB), exit(1); 51 umountall(); 52 exit(0); 53 } 54 while (argc > 0) { 55 if (umountfs(*argv++) == 0) 56 errs++; 57 argc--; 58 } 59 exit(errs); 60 } 61 62 umountall() 63 { 64 struct fstab fs, *fsp; 65 66 if ((fsp = getfsent()) == 0) 67 return; 68 fs = *fsp; /* save info locally; it is static from getfsent() */ 69 umountall(); 70 if (strcmp(fs.fs_file, "/") == 0) 71 return; 72 if (strcmp(fs.fs_type, FSTAB_RW) && strcmp(fs.fs_type, FSTAB_RO)) 73 return; 74 if (umountfs(fs.fs_spec) < 0) { 75 perror(fs.fs_spec); 76 return; 77 } 78 } 79 80 struct mtab zeromtab; 81 82 umountfs(name) 83 char *name; 84 { 85 register char *p1, *p2; 86 register struct mtab *mp; 87 int mf; 88 89 if (umount(name) < 0) { 90 perror(name); 91 return (0); 92 } 93 if (vflag) 94 fprintf(stderr, "%s: Unmounted\n", name); 95 while ((p1 = rindex(name, '/')) && p1[1] == 0) 96 *p1 = 0; 97 if (p1) 98 name = p1 + 1; 99 for (mp = mtab; mp < &mtab[NMOUNT]; mp++) { 100 if (strncmp(mp->spec, name, sizeof (mp->spec))) 101 continue; 102 *mp = zeromtab; 103 for (mp = &mtab[NMOUNT]; mp >= mtab; mp--) 104 if (mp->file[0]) 105 break; 106 mp++; 107 mf = creat("/etc/mtab", 0644); 108 write(mf, (char *)mtab, (mp-mtab) * sizeof (struct mtab)); 109 return (1); 110 } 111 fprintf(stderr, "%s: Not mounted\n", name); 112 return (0); 113 } 114