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      1 /*
      2  *
      3  *   Copyright (c) Wipro Technologies, 2002.  All Rights Reserved.
      4  *
      5  *   This program is free software;  you can redistribute it and/or modify
      6  *   it under the terms of the GNU General Public License as published by
      7  *   the Free Software Foundation; either version 2 of the License, or
      8  *   (at your option) any later version.
      9  *
     10  *   This program is distributed in the hope that it will be useful,
     11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
     12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
     13  *   the GNU General Public License for more details.
     14  *
     15  *   You should have received a copy of the GNU General Public License
     16  *   along with this program;  if not, write to the Free Software
     17  *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     18  *
     19  */
     20 
     21 /*********************************************************************
     22  *    TEST IDENTIFIER	: sethostname01
     23  *
     24  *    EXECUTED BY	: root / superuser
     25  *
     26  *    TEST TITLE	: Basic test for sethostname(2)
     27  *
     28  *    TEST CASE TOTAL	: 1
     29  *
     30  *    AUTHOR		: Suresh Babu V. <suresh.babu (at) wipro.com>
     31  *
     32  *    SIGNALS
     33  *	Uses SIGUSR1 to pause before test if option set.
     34  *	(See the parse_opts(3) man page).
     35  *
     36  *    DESCRIPTION$
     37  *      This is a Phase I test for the sethostname(2) system call.
     38  *      It is intended to provide a limited exposure of the system call.
     39  *
     40  *      Setup:
     41  *        Setup signal handling.
     42  *        Save the current hostname.
     43  *        Pause for SIGUSR1 if option specified.
     44  *
     45  *      Test:
     46  *       Loop if the proper options are given.
     47  *        Execute system call
     48  *        Check return code, if system call failed (return=-1)
     49  *              Log the errno and Issue a FAIL message.
     50  *        Otherwise, Issue a PASS message.
     51  *      Cleanup:
     52  *        Restore old host name.
     53  *        Print errno log and/or timing stats if options given
     54  *
     55  * Usage:  <for command-line>
     56  *  sethostname01 [-c n] [-i n] [-I x] [-P x] [-p] [-t] [-h]
     57  *	where,  -c n : Run n copies concurrently.
     58  *		-i n : Execute test n times.
     59  *		-I x : Execute test for x seconds.
     60  *		-p   : Pause for SIGUSR1 before starting
     61  *		-P x : Pause for x seconds between iterations.
     62  *		-t   : Turn on syscall timing.
     63  *		-h   : Display usage information
     64  *
     65  *
     66  ******************************************************************/
     67 
     68 #include <string.h>
     69 #include <errno.h>
     70 #include <linux/utsname.h>
     71 
     72 #include "test.h"
     73 
     74 #define MAX_LENGTH __NEW_UTS_LEN
     75 
     76 static void setup();
     77 static void cleanup();
     78 
     79 char *TCID = "sethostname01";
     80 int TST_TOTAL = 1;
     81 static char hname[MAX_LENGTH];	/* host name */
     82 
     83 int main(int ac, char **av)
     84 {
     85 	int lc;
     86 
     87 	char ltphost[] = "ltphost";	/* temporary host name to set */
     88 
     89 	tst_parse_opts(ac, av, NULL, NULL);
     90 
     91 	/* Do initial setup. */
     92 	setup();
     93 
     94 	/* check -c option for looping. */
     95 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     96 
     97 		tst_count = 0;
     98 
     99 		/* Call sethostname(2) */
    100 		TEST(sethostname(ltphost, sizeof(ltphost)));
    101 
    102 		/* check return code */
    103 		if (TEST_RETURN == -1) {
    104 			tst_resm(TFAIL, "sethostname() failed , errno=%d : %s",
    105 				 TEST_ERRNO, strerror(TEST_ERRNO));
    106 		} else {
    107 			tst_resm(TPASS, "sethostname() returned %ld,"
    108 				 " Hostname set to \"%s\"", TEST_RETURN,
    109 				 ltphost);
    110 		}
    111 
    112 	}
    113 
    114 	/* cleanup and exit */
    115 	cleanup();
    116 	tst_exit();
    117 
    118 }
    119 
    120 /*
    121  * setup() - performs all one time setup for this test.
    122  */
    123 void setup(void)
    124 {
    125 	int ret;
    126 
    127 	tst_require_root();
    128 
    129 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
    130 
    131 	/* Store the existing hostname to retain it before exiting */
    132 	if ((ret = gethostname(hname, sizeof(hname))) < 0) {
    133 		tst_brkm(TBROK, NULL, "gethostname() failed while getting"
    134 			 " current host name");
    135 	}
    136 
    137 	TEST_PAUSE;
    138 
    139 }
    140 
    141 /*
    142  * cleanup() -	performs all one time cleanup for this test
    143  *		completion or premature exit.
    144  */
    145 void cleanup(void)
    146 {
    147 	int ret;
    148 
    149 	/* Set the host name back to original name */
    150 	if ((ret = sethostname(hname, strlen(hname))) < 0) {
    151 		tst_resm(TWARN, "sethostname() failed while restoring"
    152 			 " hostname to \"%s\": %s", hname, strerror(errno));
    153 	}
    154 
    155 }
    156