1/*
2 *
3 *   Copyright (c) International Business Machines  Corp., 2001
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 * Test Name: lseek08
22 *
23 * Test Description:
24 *  Verify that, lseek() call succeeds to set the file pointer position
25 *  to the end of the file when 'whence' value set to SEEK_END and any
26 *  attempts to read from that position should fail.
27 *
28 * Expected Result:
29 *  lseek() should return the offset which is set to the file size measured
30 *  in bytes. read() attempt should fail with -1 return value.
31 * $
32 * Algorithm:
33 *  Setup:
34 *   Setup signal handling.
35 *   Create temporary directory.
36 *   Pause for SIGUSR1 if option specified.
37 *
38 *  Test:
39 *   Loop if the proper options are given.
40 *   Execute system call
41 *   Check return code, if system call failed (return=-1)
42 *   	Log the errno and Issue a FAIL message.
43 *   Otherwise,
44 *   	Verify the Functionality of system call
45 *      if successful,
46 *      	Issue Functionality-Pass message.
47 *      Otherwise,
48 *		Issue Functionality-Fail message.
49 *  Cleanup:
50 *   Print errno log and/or timing stats if options given
51 *   Delete the temporary directory created.
52 *
53 * Usage:  <for command-line>
54 *  lseek08 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
55 *     where,  -c n : Run n copies concurrently.
56 *             -f   : Turn off functionality Testing.
57 *	       -i n : Execute test n times.
58 *	       -I x : Execute test for x seconds.
59 *	       -P x : Pause for x seconds between iterations.
60 *	       -t   : Turn on syscall timing.
61 *
62 * HISTORY
63 *	07/2001 Ported by Wayne Boyer
64 *
65 * RESTRICTIONS:
66 *  None.
67 */
68
69#include <stdio.h>
70#include <unistd.h>
71#include <sys/types.h>
72#include <errno.h>
73#include <fcntl.h>
74#include <utime.h>
75#include <string.h>
76#include <sys/stat.h>
77#include <signal.h>
78
79#include "test.h"
80
81#define TEMP_FILE	"tmp_file"
82#define FILE_MODE	S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH
83
84char *TCID = "lseek08";
85int TST_TOTAL = 1;
86int fildes;			/* file handle for temp file */
87size_t file_size;		/* size of the temporary file */
88
89void setup();			/* Main setup function of test */
90void cleanup();			/* cleanup function for the test */
91
92int main(int ac, char **av)
93{
94	int lc;
95	char read_buf[1];	/* data read from temp. file */
96
97	tst_parse_opts(ac, av, NULL, NULL);
98
99	setup();
100
101	for (lc = 0; TEST_LOOPING(lc); lc++) {
102
103		tst_count = 0;
104
105		/*
106		 * Invoke lseek(2) to move the read/write file
107		 * pointer/handle to the END of the file.
108		 */
109		TEST(lseek(fildes, 0, SEEK_END));
110
111		if (TEST_RETURN == -1) {
112			tst_resm(TFAIL | TTERRNO,
113				 "lseek of %s failed", TEMP_FILE);
114			continue;
115		}
116		/*
117		 * Check if the return value from lseek(2)
118		 * is equal to the file_size.
119		 */
120		if (TEST_RETURN != file_size) {
121			tst_resm(TFAIL, "lseek() returned incorrect "
122				 "value %ld, expected %zu",
123				 TEST_RETURN, file_size);
124			continue;
125		}
126		/*
127		 * The return value is okay, now attempt to read data
128		 * from the file.  This should fail as the file pointer
129		 * should be pointing to END OF FILE.
130		 */
131		read_buf[0] = '\0';
132		if (read(fildes, &read_buf, sizeof(read_buf)) > 0) {
133			tst_resm(TFAIL, "read() successful on %s",
134				 TEMP_FILE);
135		} else {
136			tst_resm(TPASS, "Functionality of lseek() on "
137				 "%s successful", TEMP_FILE);
138		}
139	}
140
141	cleanup();
142	tst_exit();
143}
144
145/*
146 * setup() - performs all ONE TIME setup for this test.
147 *	     Create a temporary directory and change directory to it.
148 *	     Create a test file under temporary directory and write some
149 *	     data into it.
150 *	     Get the size of the file using fstat().
151 */
152void setup(void)
153{
154	struct stat stat_buf;	/* struct. buffer for stat(2) */
155	char write_buf[BUFSIZ];	/* buffer to hold data */
156
157	tst_sig(NOFORK, DEF_HANDLER, cleanup);
158
159	TEST_PAUSE;
160
161	tst_tmpdir();
162
163	/* Get the data to be written to temporary file */
164	strcpy(write_buf, "abcdefg\n");
165
166	/* Creat/open a temporary file under above directory */
167	if ((fildes = open(TEMP_FILE, O_RDWR | O_CREAT, FILE_MODE)) == -1) {
168		tst_brkm(TBROK | TERRNO, cleanup,
169			 "open(%s, O_RDWR|O_CREAT, %#o) failed",
170			 TEMP_FILE, FILE_MODE);
171	}
172
173	/* Write data into temporary file */
174	if (write(fildes, write_buf, strlen(write_buf)) <= 0) {
175		tst_brkm(TBROK | TERRNO, cleanup,
176			 "writing to %s failed", TEMP_FILE);
177	}
178
179	/* Get the size of the file using fstat */
180	if (fstat(fildes, &stat_buf) < 0) {
181		tst_brkm(TBROK | TERRNO, cleanup,
182			 "fstat of %s failed", TEMP_FILE);
183	}
184
185	file_size = stat_buf.st_size;
186}
187
188/*
189 * cleanup() - performs all ONE TIME cleanup for this test at
190 *             completion or premature exit.
191 *	       Remove the test directory and testfile created in the setup.
192 */
193void cleanup(void)
194{
195
196	/* Close the temporary file created */
197	if (close(fildes) < 0) {
198		tst_brkm(TFAIL, NULL,
199			 "close(%s) Failed, errno=%d : %s:",
200			 TEMP_FILE, errno, strerror(errno));
201	}
202
203	tst_rmdir();
204
205}
206