1 /* chmod.c - Change file mode bits 2 * 3 * Copyright 2012 Rob Landley <rob (at) landley.net> 4 * 5 * See http://opengroup.org/onlinepubs/9699919799/utilities/chmod.html 6 7 USE_CHMOD(NEWTOY(chmod, "<2?vRf[-vf]", TOYFLAG_BIN)) 8 9 config CHMOD 10 bool "chmod" 11 default y 12 help 13 usage: chmod [-R] MODE FILE... 14 15 Change mode of listed file[s] (recursively with -R). 16 17 MODE can be (comma-separated) stanzas: [ugoa][+-=][rwxstXugo] 18 19 Stanzas are applied in order: For each category (u = user, 20 g = group, o = other, a = all three, if none specified default is a), 21 set (+), clear (-), or copy (=), r = read, w = write, x = execute. 22 s = u+s = suid, g+s = sgid, o+s = sticky. (+t is an alias for o+s). 23 suid/sgid: execute as the user/group who owns the file. 24 sticky: can't delete files you don't own out of this directory 25 X = x for directories or if any category already has x set. 26 27 Or MODE can be an octal value up to 7777 ug uuugggooo top + 28 bit 1 = o+x, bit 1<<8 = u+w, 1<<11 = g+1 sstrwxrwxrwx bottom 29 30 Examples: 31 chmod u+w file - allow owner of "file" to write to it. 32 chmod 744 file - user can read/write/execute, everyone else read only 33 */ 34 35 #define FOR_chmod 36 #include "toys.h" 37 38 GLOBALS( 39 char *mode; 40 ) 41 42 static int do_chmod(struct dirtree *try) 43 { 44 mode_t mode; 45 46 if (!dirtree_notdotdot(try)) return 0; 47 48 mode = string_to_mode(TT.mode, try->st.st_mode); 49 if (toys.optflags & FLAG_v) { 50 char *s = dirtree_path(try, 0); 51 printf("chmod '%s' to %04o\n", s, mode); 52 free(s); 53 } 54 wfchmodat(dirtree_parentfd(try), try->name, mode); 55 56 return (toys.optflags & FLAG_R) ? DIRTREE_RECURSE : 0; 57 } 58 59 void chmod_main(void) 60 { 61 TT.mode = *toys.optargs; 62 char **file; 63 64 for (file = toys.optargs+1; *file; file++) dirtree_read(*file, do_chmod); 65 } 66
