view toys/posix/chmod.c @ 674:7e846e281e38

New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
author Rob Landley <>
date Mon, 08 Oct 2012 00:02:30 -0500
parents 6df4ccc0acbe
children 786841fdb1e0
line wrap: on
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/* vi: set sw=4 ts=4:
 * chmod.c - Change file mode bits
 * Copyright 2012 Rob Landley <>
 * See


config CHMOD
    bool "chmod"
    default y
        usage: chmod [-R] MODE FILE...

        Change mode of listed file[s] (recursively with -R).

        MODE can be (comma-separated) stanzas: [ugoa][+-=][rwxstXugo]

        Stanzas are applied in order: For each category (u = user,
        g = group, o = other, a = all three, if none specified default is a),
        set (+), clear (-), or copy (=), r = read, w = write, x = execute.
        s = u+s = suid, g+s = sgid, o+s = sticky. (+t is an alias for o+s).
        suid/sgid: execute as the user/group who owns the file.
        sticky: can't delete files you don't own out of this directory
        X = x for directories or if any category already has x set.

        Or MODE can be an octal value up to 7777	ug uuugggooo	top +
        bit 1 = o+x, bit 1<<8 = u+w, 1<<11 = g+1	sstrwxrwxrwx	bottom

        chmod u+w file - allow owner of "file" to write to it.
        chmod 744 file - user can read/write/execute, everyone else read only

#define FOR_chmod
#include "toys.h"

    char *mode;

int do_chmod(struct dirtree *try)
    mode_t mode;

    if (!dirtree_notdotdot(try)) return 0;

    mode = string_to_mode(TT.mode, try->st.st_mode);
    if (toys.optflags & FLAG_v) {
        char *s = dirtree_path(try, 0);
        printf("chmod '%s' to %04o\n", s, mode);
    wfchmodat(dirtree_parentfd(try), try->name, mode);

    return (toys.optflags & FLAG_R) ? DIRTREE_RECURSE : 0;

void chmod_main(void)
    TT.mode = *toys.optargs;
    char **file;

    for (file = toys.optargs+1; *file; file++) dirtree_read(*file, do_chmod);