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      1 /*
      2  * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
      3  *  AUTHOR		: Richard Logan
      4  *  CO-PILOT		: William Roske
      5  * Copyright (c) 2014 Cyril Hrubis <chrubis (at) suse.cz>
      6  *
      7  * This program is free software; you can redistribute it and/or modify it
      8  * under the terms of version 2 of the GNU General Public License as
      9  * published by the Free Software Foundation.
     10  *
     11  * This program is distributed in the hope that it would be useful, but
     12  * WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
     14  *
     15  * Further, this software is distributed without any warranty that it is
     16  * free of the rightful claim of any third person regarding infringement
     17  * or the like.  Any license provided herein, whether implied or
     18  * otherwise, applies only to this software file.  Patent licenses, if
     19  * any, provided herein do not apply to combinations of this program with
     20  * other software, or any other product whatsoever.
     21  *
     22  * You should have received a copy of the GNU General Public License along
     23  * with this program; if not, write the Free Software Foundation, Inc.,
     24  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
     25  *
     26  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
     27  * Mountain View, CA  94043, or:
     28  *
     29  * http://www.sgi.com
     30  *
     31  * For further information regarding this notice, see:
     32  *
     33  * http://oss.sgi.com/projects/GenInfo/NoticeExplan/
     34  *
     35  */
     36 
     37  /*
     38   * Tests that link(2) succeds with creating n links.
     39   */
     40 
     41 #include <sys/types.h>
     42 #include <fcntl.h>
     43 #include <sys/stat.h>
     44 #include <errno.h>
     45 #include <string.h>
     46 #include <signal.h>
     47 #include "test.h"
     48 #include "safe_macros.h"
     49 
     50 static void setup(void);
     51 static void help(void);
     52 static void cleanup(void);
     53 
     54 char *TCID = "link03";
     55 int TST_TOTAL = 2;
     56 
     57 #define BASENAME	"lkfile"
     58 
     59 static char fname[255];
     60 static int nlinks = 0;
     61 static char *links_arg;
     62 
     63 option_t options[] = {
     64 	{"N:", NULL, &links_arg},
     65 	{NULL, NULL, NULL}
     66 };
     67 
     68 int main(int ac, char **av)
     69 {
     70 	int lc;
     71 	struct stat buf;
     72 	int i, links;
     73 	char lname[255];
     74 
     75 	tst_parse_opts(ac, av, options, &help);
     76 
     77 	if (links_arg) {
     78 		nlinks = atoi(links_arg);
     79 
     80 		if (nlinks == 0) {
     81 			tst_brkm(TBROK, NULL,
     82 			         "nlinks is not a positive number");
     83 		}
     84 
     85 		if (nlinks > 1000) {
     86 			tst_resm(TINFO,
     87 				 "nlinks > 1000 - may get errno:%d (EMLINK)",
     88 				 EMLINK);
     89 		}
     90 	}
     91 
     92 	setup();
     93 
     94 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     95 		tst_count = 0;
     96 
     97 		if (nlinks)
     98 			links = nlinks;
     99 		else
    100 			links = (lc % 90) + 10;
    101 
    102 		/* Create links - 1 hardlinks so that the st_nlink == links */
    103 		for (i = 1; i < links; i++) {
    104 			sprintf(lname, "%s%d", fname, i);
    105 			TEST(link(fname, lname));
    106 
    107 			if (TEST_RETURN == -1) {
    108 				tst_brkm(TFAIL | TTERRNO, cleanup,
    109 					 "link(%s, %s) Failed", fname, lname);
    110 			}
    111 		}
    112 
    113 		SAFE_STAT(cleanup, fname, &buf);
    114 
    115 		if (buf.st_nlink != (nlink_t)links) {
    116 			tst_resm(TFAIL, "Wrong number of links for "
    117 			         "'%s' have %i, should be %i",
    118 				 fname, (int)buf.st_nlink, links);
    119 			goto unlink;
    120 		}
    121 
    122 		for (i = 1; i < links; i++) {
    123 			sprintf(lname, "%s%d", fname, i);
    124 			SAFE_STAT(cleanup, lname, &buf);
    125 			if (buf.st_nlink != (nlink_t)links) {
    126 				tst_resm(TFAIL,
    127 				         "Wrong number of links for "
    128 					 "'%s' have %i, should be %i",
    129 					 lname, (int)buf.st_nlink, links);
    130 				goto unlink;
    131 			}
    132 		}
    133 
    134 		tst_resm(TPASS, "link() passed and linkcounts=%d match", links);
    135 
    136 unlink:
    137 		for (i = 1; i < links; i++) {
    138 			sprintf(lname, "%s%d", fname, i);
    139 			SAFE_UNLINK(cleanup, lname);
    140 		}
    141 	}
    142 
    143 	cleanup();
    144 	tst_exit();
    145 }
    146 
    147 static void help(void)
    148 {
    149 	printf("  -N #links : create #links hard links every iteration\n");
    150 }
    151 
    152 static void setup(void)
    153 {
    154 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
    155 
    156 	TEST_PAUSE;
    157 
    158 	tst_tmpdir();
    159 
    160 	sprintf(fname, "%s_%d", BASENAME, getpid());
    161 	SAFE_TOUCH(cleanup, fname, 0700, NULL);
    162 }
    163 
    164 static void cleanup(void)
    165 {
    166 	tst_rmdir();
    167 }
    168