/* mkfifo -- make fifo's (named pipes) This is the mkfifo utility
Copyright (C) 1990-2018 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */ The GNUv3 license
/* David MacKenzie <djm@ai.mit.edu> */
#include <config.h> Provides system specific information
#include <stdio.h> Provides standard I/O capability
#include <getopt.h> ...!includes auto-comment...
#include <sys/types.h> Provides system data types
#include <selinux/selinux.h> ...!includes auto-comment......!includes auto-comment...
#include "system.h" ...!includes auto-comment...
#include "die.h" ...!includes auto-comment...
#include "error.h" ...!includes auto-comment...
#include "modechange.h" ...!includes auto-comment...
#include "quote.h" ...!includes auto-comment...
#include "selinux.h" ...!includes auto-comment...
#include "smack.h" ...!includes auto-comment...
/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "mkfifo" Line 34
#define AUTHORS proper_name ("David MacKenzie") Line 36
static struct option const longopts[] = Line 38
{
{GETOPT_SELINUX_CONTEXT_OPTION_DECL}, Line 40
{"mode", required_argument, NULL, 'm'}, Line 41
{GETOPT_HELP_OPTION_DECL}, Line 42
{GETOPT_VERSION_OPTION_DECL}, Line 43
{NULL, 0, NULL, 0} Line 44
}; Block 1
void Line 47
usage (int status) Line 48
{
if (status != EXIT_SUCCESS) Line 50
emit_try_help (); ...!common auto-comment...
else Line 52
{
printf (_("Usage: %s [OPTION]... NAME...\n"), program_name); Line 54
fputs (_("\ Line 55
Create named pipes (FIFOs) with the given NAMEs.\n\ Line 56
"), stdout); Line 57
emit_mandatory_arg_note (); ...!common auto-comment...
fputs (_("\ Line 61
-m, --mode=MODE set file permission bits to MODE, not a=rw - umask\n\ Line 62
"), stdout); Line 63
fputs (_("\ Line 64
-Z set the SELinux security context to default type\n\ Line 65
--context[=CTX] like -Z, or if CTX is specified then set the SELinux\n\ Line 66
or SMACK security context to CTX\n\ Line 67
"), stdout); Line 68
fputs (HELP_OPTION_DESCRIPTION, stdout); Line 69
fputs (VERSION_OPTION_DESCRIPTION, stdout); Line 70
emit_ancillary_info (PROGRAM_NAME); Line 71
}
exit (status); Line 73
} Block 2
int
main (int argc, char **argv) Line 77
{
mode_t newmode; Line 79
char const *specified_mode = NULL; Line 80
int exit_status = EXIT_SUCCESS; Line 81
int optc; Line 82
char const *scontext = NULL; Line 83
bool set_security_context = false; Line 84
initialize_main (&argc, &argv); VMS-specific entry point handling wildcard expansion
set_program_name (argv[0]); Retains program name and discards path
setlocale (LC_ALL, ""); Sets up internationalization (i18n)
bindtextdomain (PACKAGE, LOCALEDIR); Assigns i18n directorySets text domain for _() [gettext()] function
textdomain (PACKAGE); Sets text domain for _() [gettext()] function
atexit (close_stdout); Close stdout on exit (see gnulib)
while ((optc = getopt_long (argc, argv, "m:Z", longopts, NULL)) != -1) Line 94
{
switch (optc) Line 96
{
case 'm': Line 98
specified_mode = optarg; Line 99
break; Line 100
case 'Z': Line 101
if (is_smack_enabled ()) ...!common auto-comment...
{
/* We don't yet support -Z to restore context with SMACK. */
scontext = optarg; Line 105
}
else if (is_selinux_enabled () > 0) ...!common auto-comment...
{
if (optarg) Line 109
scontext = optarg; Line 110
else Line 111
set_security_context = true; Line 112
}
else if (optarg) Line 114
{
error (0, 0, Line 116
_("warning: ignoring --context; " Line 117
"it requires an SELinux/SMACK-enabled kernel")); Line 118
}
break; Line 120
case_GETOPT_HELP_CHAR; Line 121
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS); Line 122
default: Line 123
usage (EXIT_FAILURE); Line 124
}
}
if (optind == argc) Line 128
{
error (0, 0, _("missing operand")); Line 130
usage (EXIT_FAILURE); Line 131
}
if (scontext) Line 134
{
int ret = 0; Line 136
if (is_smack_enabled ()) ...!common auto-comment...
ret = smack_set_label_for_self (scontext); Line 138
else Line 139
ret = setfscreatecon (se_const (scontext)); Line 140
if (ret < 0) Line 142
die (EXIT_FAILURE, errno, Line 143
_("failed to set default file creation context to %s"), Line 144
quote (scontext)); Line 145
}
newmode = MODE_RW_UGO; Line 148
if (specified_mode) Line 149
{
mode_t umask_value; Line 151
struct mode_change *change = mode_compile (specified_mode); Line 152
if (!change) Line 153
die (EXIT_FAILURE, 0, _("invalid mode")); Line 154
umask_value = umask (0); Line 155
umask (umask_value); Line 156
newmode = mode_adjust (newmode, false, umask_value, change, NULL); Line 157
free (change); Line 158
if (newmode & ~S_IRWXUGO) Line 159
die (EXIT_FAILURE, 0, Line 160
_("mode must specify only file permission bits")); Line 161
}
for (; optind < argc; ++optind) Line 164
{
if (set_security_context) Line 166
defaultcon (argv[optind], S_IFIFO); Line 167
if (mkfifo (argv[optind], newmode) != 0) Line 168
{
error (0, errno, _("cannot create fifo %s"), quoteaf (argv[optind])); Line 170
exit_status = EXIT_FAILURE; Line 171
}
else if (specified_mode && lchmod (argv[optind], newmode) != 0) Line 173
{
error (0, errno, _("cannot set permissions of %s"), Line 175
quoteaf (argv[optind])); Line 176
exit_status = EXIT_FAILURE; Line 177
}
}
return exit_status; Line 181
} Block 3