/* mknod -- make special files Copyright (C) 90, 91, 1995-2003 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* Written by David MacKenzie */ #include #include #include #include #include "system.h" #include "error.h" #include "modechange.h" #include "quote.h" #include "xstrtol.h" /* The official name of this program (e.g., no `g' prefix). */ #define PROGRAM_NAME "mknod" #define WRITTEN_BY _("Written by David MacKenzie.") /* The name this program was run with. */ char *program_name; static struct option const longopts[] = { {"mode", required_argument, NULL, 'm'}, {GETOPT_HELP_OPTION_DECL}, {GETOPT_VERSION_OPTION_DECL}, {NULL, 0, NULL, 0} }; void usage (int status) { if (status != 0) fprintf (stderr, _("Try `%s --help' for more information.\n"), program_name); else { printf (_("Usage: %s [OPTION]... NAME TYPE [MAJOR MINOR]\n"), program_name); fputs (_("\ Create the special file NAME of the given TYPE.\n\ \n\ "), stdout); fputs (_("\ Mandatory arguments to long options are mandatory for short options too.\n\ "), stdout); fputs (_("\ -m, --mode=MODE set permission mode (as in chmod), not a=rw - umask\n\ "), stdout); fputs (HELP_OPTION_DESCRIPTION, stdout); fputs (VERSION_OPTION_DESCRIPTION, stdout); fputs (_("\ \n\ Both MAJOR and MINOR must be specified when TYPE is b, c, or u, and they\n\ must be omitted when TYPE is p. If MAJOR or MINOR begins with 0x or 0X,\n\ it is interpreted as hexadecimal; otherwise, if it begins with 0, as octal;\n\ otherwise, as decimal. TYPE may be:\n\ "), stdout); fputs (_("\ \n\ b create a block (buffered) special file\n\ c, u create a character (unbuffered) special file\n\ p create a FIFO\n\ "), stdout); printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT); } exit (status); } int main (int argc, char **argv) { mode_t newmode; struct mode_change *change; const char *specified_mode; int optc; mode_t node_type; initialize_main (&argc, &argv); program_name = argv[0]; setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); atexit (close_stdout); specified_mode = NULL; while ((optc = getopt_long (argc, argv, "m:", longopts, NULL)) != -1) { switch (optc) { case 0: break; case 'm': specified_mode = optarg; break; case_GETOPT_HELP_CHAR; case_GETOPT_VERSION_CHAR (PROGRAM_NAME, WRITTEN_BY); default: usage (EXIT_FAILURE); } } newmode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); if (specified_mode) { newmode &= ~ umask (0); change = mode_compile (specified_mode, 0); if (change == MODE_INVALID) error (EXIT_FAILURE, 0, _("invalid mode")); else if (change == MODE_MEMORY_EXHAUSTED) xalloc_die (); newmode = mode_adjust (newmode, change); } if (argc - optind != 2 && argc - optind != 4) { const char *msg; if (argc - optind < 2) msg = _("too few arguments"); else if (argc - optind > 4) msg = _("too many arguments"); else msg = _("wrong number of arguments"); error (0, 0, "%s", msg); usage (EXIT_FAILURE); } /* Only check the first character, to allow mnemonic usage like `mknod /dev/rst0 character 18 0'. */ switch (argv[optind + 1][0]) { case 'b': /* `block' or `buffered' */ #ifndef S_IFBLK error (4, 0, _("block special files not supported")); #else node_type = S_IFBLK; #endif goto block_or_character; case 'c': /* `character' */ case 'u': /* `unbuffered' */ #ifndef S_IFCHR error (4, 0, _("character special files not supported")); #else node_type = S_IFCHR; #endif goto block_or_character; block_or_character: if (argc - optind != 4) { error (0, 0, _("\ when creating special files, major and minor device\n\ numbers must be specified")); usage (EXIT_FAILURE); } { char const *s_major = argv[optind + 2]; char const *s_minor = argv[optind + 3]; uintmax_t i_major, i_minor; dev_t device; if (xstrtoumax (s_major, NULL, 0, &i_major, NULL) != LONGINT_OK || i_major != (major_t) i_major) error (EXIT_FAILURE, 0, _("invalid major device number %s"), quote (s_major)); if (xstrtoumax (s_minor, NULL, 0, &i_minor, NULL) != LONGINT_OK || i_minor != (minor_t) i_minor) error (EXIT_FAILURE, 0, _("invalid minor device number %s"), quote (s_minor)); device = makedev (i_major, i_minor); #ifdef NODEV if (device == NODEV) error (EXIT_FAILURE, 0, _("invalid device %s %s"), s_major, s_minor); #endif if (mknod (argv[optind], newmode | node_type, device) != 0) error (EXIT_FAILURE, errno, "%s", quote (argv[optind])); } break; case 'p': /* `pipe' */ #ifndef S_ISFIFO error (4, 0, _("fifo files not supported")); #else if (argc - optind != 2) { error (0, 0, _("\ major and minor device numbers may not be specified for fifo files")); usage (EXIT_FAILURE); } if (mkfifo (argv[optind], newmode)) error (EXIT_FAILURE, errno, "%s", quote (argv[optind])); #endif break; default: error (0, 0, _("invalid device type %s"), quote (argv[optind + 1])); usage (EXIT_FAILURE); } /* Perform an explicit chmod to ensure the file mode permission bits are set as specified. This extra step is necessary in some cases when the containing directory has a default ACL. */ if (specified_mode) { if (chmod (argv[optind], newmode)) error (0, errno, _("cannot set permissions of %s"), quote (argv[optind])); } exit (EXIT_SUCCESS); }