1f08c3bdfSopenharmony_ci// SPDX-License-Identifier: GPL-2.0-or-later 2f08c3bdfSopenharmony_ci/* 3f08c3bdfSopenharmony_ci * Copyright (c) International Business Machines Corp., 2001 4f08c3bdfSopenharmony_ci */ 5f08c3bdfSopenharmony_ci 6f08c3bdfSopenharmony_ci/*\ 7f08c3bdfSopenharmony_ci * [Description] 8f08c3bdfSopenharmony_ci * 9f08c3bdfSopenharmony_ci * Testcase to check if read() returns the number of bytes read correctly. 10f08c3bdfSopenharmony_ci */ 11f08c3bdfSopenharmony_ci 12f08c3bdfSopenharmony_ci#include <sys/types.h> 13f08c3bdfSopenharmony_ci#include <sys/stat.h> 14f08c3bdfSopenharmony_ci#include <stdio.h> 15f08c3bdfSopenharmony_ci#include <fcntl.h> 16f08c3bdfSopenharmony_ci#include "tst_test.h" 17f08c3bdfSopenharmony_ci 18f08c3bdfSopenharmony_cistatic const char *fname = "test_file"; 19f08c3bdfSopenharmony_cistatic const char palfa[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 20f08c3bdfSopenharmony_ci#define PALFA_LEN (sizeof(palfa)-1) 21f08c3bdfSopenharmony_ci 22f08c3bdfSopenharmony_cistatic void verify_read(void) 23f08c3bdfSopenharmony_ci{ 24f08c3bdfSopenharmony_ci int fd; 25f08c3bdfSopenharmony_ci char prbuf[BUFSIZ]; 26f08c3bdfSopenharmony_ci 27f08c3bdfSopenharmony_ci fd = SAFE_OPEN(fname, O_RDONLY); 28f08c3bdfSopenharmony_ci TEST(read(fd, prbuf, BUFSIZ)); 29f08c3bdfSopenharmony_ci 30f08c3bdfSopenharmony_ci if (TST_RET != PALFA_LEN) { 31f08c3bdfSopenharmony_ci tst_res(TFAIL, "Bad read count - got %ld - expected %zu", 32f08c3bdfSopenharmony_ci TST_RET, PALFA_LEN); 33f08c3bdfSopenharmony_ci goto out; 34f08c3bdfSopenharmony_ci } 35f08c3bdfSopenharmony_ci 36f08c3bdfSopenharmony_ci if (memcmp(palfa, prbuf, PALFA_LEN)) { 37f08c3bdfSopenharmony_ci tst_res(TFAIL, "read buffer not equal to write buffer"); 38f08c3bdfSopenharmony_ci goto out; 39f08c3bdfSopenharmony_ci } 40f08c3bdfSopenharmony_ci 41f08c3bdfSopenharmony_ci tst_res(TPASS, "read() data correctly"); 42f08c3bdfSopenharmony_ci 43f08c3bdfSopenharmony_ciout: 44f08c3bdfSopenharmony_ci SAFE_CLOSE(fd); 45f08c3bdfSopenharmony_ci} 46f08c3bdfSopenharmony_ci 47f08c3bdfSopenharmony_cistatic void setup(void) 48f08c3bdfSopenharmony_ci{ 49f08c3bdfSopenharmony_ci int fd; 50f08c3bdfSopenharmony_ci 51f08c3bdfSopenharmony_ci fd = SAFE_CREAT(fname, 0777); 52f08c3bdfSopenharmony_ci SAFE_WRITE(SAFE_WRITE_ALL, fd, palfa, PALFA_LEN); 53f08c3bdfSopenharmony_ci SAFE_CLOSE(fd); 54f08c3bdfSopenharmony_ci} 55f08c3bdfSopenharmony_ci 56f08c3bdfSopenharmony_cistatic struct tst_test test = { 57f08c3bdfSopenharmony_ci .needs_tmpdir = 1, 58f08c3bdfSopenharmony_ci .setup = setup, 59f08c3bdfSopenharmony_ci .test_all = verify_read, 60f08c3bdfSopenharmony_ci}; 61