91 lines
1.7 KiB
C
91 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) International Business Machines Corp., 2001
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* Ported to LTP: Wayne Boyer
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*/
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/*
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* Test Description :
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* Testcase to check the basic functionality of the readlink(2),
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* readlink() will succeed to read the contents of the symbolic link.
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*/
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#include <pwd.h>
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#include <errno.h>
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#include <string.h>
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#include "tst_test.h"
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#define TESTFILE "test_file"
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#define SYMFILE "slink_file"
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static uid_t nobody_uid;
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static void test_readlink(void)
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{
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char buffer[256];
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int exp_val = strlen(TESTFILE);
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TEST(readlink(SYMFILE, buffer, sizeof(buffer)));
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if (TST_RET == -1) {
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tst_res(TFAIL | TTERRNO, "readlink() on %s failed", SYMFILE);
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return;
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}
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if (TST_RET != exp_val) {
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tst_res(TFAIL, "readlink() returned value %ld "
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"did't match, Expected %d", TST_RET, exp_val);
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return;
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}
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if (memcmp(buffer, TESTFILE, exp_val) != 0) {
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tst_res(TFAIL, "Pathname %s and buffer contents %s differ",
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TESTFILE, buffer);
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} else {
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tst_res(TPASS, "readlink() functionality on '%s' was correct",
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SYMFILE);
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}
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}
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static void verify_readlink(unsigned int n)
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{
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pid_t pid;
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if (n) {
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tst_res(TINFO, "Running test as nobody");
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pid = SAFE_FORK();
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if (!pid) {
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SAFE_SETUID(nobody_uid);
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test_readlink();
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return;
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}
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} else {
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tst_res(TINFO, "Running test as root");
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test_readlink();
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}
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}
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static void setup(void)
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{
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int fd;
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struct passwd *pw;
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pw = SAFE_GETPWNAM("nobody");
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nobody_uid = pw->pw_uid;
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fd = SAFE_OPEN(TESTFILE, O_RDWR | O_CREAT, 0444);
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SAFE_CLOSE(fd);
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SAFE_SYMLINK(TESTFILE, SYMFILE);
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}
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static struct tst_test test = {
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.test = verify_readlink,\
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.tcnt = 2,
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.setup = setup,
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.forks_child = 1,
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.needs_root = 1,
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.needs_tmpdir = 1,
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};
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