61 lines
1.1 KiB
C
61 lines
1.1 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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*/
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/*\
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* [Description]
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*
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* Testcase to check if read() returns the number of bytes read correctly.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include "tst_test.h"
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static const char *fname = "test_file";
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static const char palfa[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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#define PALFA_LEN (sizeof(palfa)-1)
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static void verify_read(void)
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{
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int fd;
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char prbuf[BUFSIZ];
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fd = SAFE_OPEN(fname, O_RDONLY);
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TEST(read(fd, prbuf, BUFSIZ));
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if (TST_RET != PALFA_LEN) {
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tst_res(TFAIL, "Bad read count - got %ld - expected %zu",
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TST_RET, PALFA_LEN);
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goto out;
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}
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if (memcmp(palfa, prbuf, PALFA_LEN)) {
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tst_res(TFAIL, "read buffer not equal to write buffer");
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goto out;
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}
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tst_res(TPASS, "read() data correctly");
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out:
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SAFE_CLOSE(fd);
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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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fd = SAFE_CREAT(fname, 0777);
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SAFE_WRITE(SAFE_WRITE_ALL, fd, palfa, PALFA_LEN);
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SAFE_CLOSE(fd);
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}
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static struct tst_test test = {
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.needs_tmpdir = 1,
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.setup = setup,
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.test_all = verify_read,
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};
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