doing a chmod on a directory causing a cycle is probably the

[unix-history] / usr / src / bin / chmod / chmod.c

/*
* Copyright (c) 1989, 1993, 1994
*      The Regents of the University of California.  All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1989, 1993, 1994\n\
       The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)chmod.c     8.7 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>

#include <err.h>
#include <errno.h>
#include <fts.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

void usage __P((void));

int
main(argc, argv)
       int argc;
       char *argv[];
{
       FTS *ftsp;
       FTSENT *p;
       mode_t *set;
       long val;
       int oct, omode;
       int Hflag, Lflag, Pflag, Rflag, ch, fflag, fts_options, hflag, rval;
       char *ep, *mode;

       Hflag = Lflag = Pflag = Rflag = fflag = hflag = 0;
       while ((ch = getopt(argc, argv, "HLPRXfgorstuwx")) != EOF)
               switch (ch) {
               case 'H':
                       Hflag = 1;
                       Lflag = Pflag = 0;
                       break;
               case 'L':
                       Lflag = 1;
                       Hflag = Pflag = 0;
                       break;
               case 'P':
                       Pflag = 1;
                       Hflag = Lflag = 0;
                       break;
               case 'R':
                       Rflag = 1;
                       break;
               case 'f':               /* XXX: undocumented. */
                       fflag = 1;
                       break;
               case 'h':
                       /*
                        * In System V (and probably POSIX.2) the -h option
                        * causes chmod to change the mode of the symbolic
                        * link.  4.4BSD's symbolic links don't have modes,
                        * so it's an undocumented noop.  Do syntax checking,
                        * though.
                        */
                       hflag = 1;
                       break;
               /*
                * XXX
                * "-[rwx]" are valid mode commands.  If they are the entire
                * argument, getopt has moved past them, so decrement optind.
                * Regardless, we're done argument processing.
                */
               case 'g': case 'o': case 'r': case 's':
               case 't': case 'u': case 'w': case 'X': case 'x':
                       if (argv[optind - 1][0] == '-' &&
                           argv[optind - 1][1] == ch &&
                           argv[optind - 1][2] == '\0')
                               --optind;
                       goto done;
               case '?':
               default:
                       usage();
               }
done:   argv += optind;
       argc -= optind;

       if (argc < 2)
               usage();

       fts_options = FTS_PHYSICAL;
       if (Rflag) {
               if (hflag)
                       errx(1,
               "the -R and -h options may not be specified together.");
               if (Hflag)
                       fts_options |= FTS_COMFOLLOW;
               if (Lflag) {
                       fts_options &= ~FTS_PHYSICAL;
                       fts_options |= FTS_LOGICAL;
               }
       }

       mode = *argv;
       if (*mode >= '0' && *mode <= '7') {
               errno = 0;
               val = strtol(mode, &ep, 8);
               if (val > INT_MAX || val < 0)
                       errno = ERANGE;
               if (errno)
                       err(1, "invalid file mode: %s", mode);
               if (*ep)
                       errx(1, "invalid file mode: %s", mode);
               omode = val;
               oct = 1;
       } else {
               if ((set = setmode(mode)) == NULL)
                       errx(1, "invalid file mode: %s", mode);
               oct = 0;
       }

       if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
               err(1, NULL);
       for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
               switch (p->fts_info) {
               case FTS_D:
                       if (Rflag)              /* Change it at FTS_DP. */
                               continue;
                       fts_set(ftsp, p, FTS_SKIP);
                       break;
               case FTS_DNR:                   /* Warn, chmod, continue. */
                       errno = p->fts_errno;
                       warn("%s", p->fts_path);
                       rval = 1;
                       break;
               case FTS_ERR:                   /* Warn, continue. */
               case FTS_NS:
                       errno = p->fts_errno;
                       warn("%s", p->fts_path);
                       rval = 1;
                       continue;
               case FTS_SL:                    /* Ignore. */
               case FTS_SLNONE:
                       /*
                        * The only symlinks that end up here are ones that
                        * don't point to anything and ones that we found
                        * doing a physical walk.
                        */
                       continue;
               default:
                       break;
               }
               if (chmod(p->fts_accpath, oct ? omode :
                   getmode(set, p->fts_statp->st_mode)) && !fflag) {
                       warn(p->fts_path);
                       rval = 1;
               }
       }
       if (errno)
               err(1, "fts_read");
       exit(rval);
}

void
usage()
{
       (void)fprintf(stderr,
           "usage: chmod [-R [-H | -L | -P]] mode file ...\n");
       exit(1);
}