126 lines
3.0 KiB
C
126 lines
3.0 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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* 07/2001 Ported by Wayne Boyer
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* Copyright (c) 2013 Cyril Hrubis <chrubis@suse.cz>
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*/
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/*
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* DESCRIPTION
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* Testcase to check the basic functionality of the readv(2) system call.
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*
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* ALGORITHM
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* Create a IO vector, and attempt to readv() various components of it.
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*/
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <fcntl.h>
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#include <memory.h>
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#include "tst_test.h"
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/* Note: multi_iovec test assumes CHUNK is divisible by 4 */
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#define CHUNK 64
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static char buf[CHUNK];
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static struct iovec *rd_iovec, *big_iovec, *multi_iovec, *lockup_iovec;
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static int fd;
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static struct testcase {
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struct iovec **iov;
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int iov_count, exp_ret;
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const char *name;
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} testcase_list[] = {
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{&rd_iovec, 0, 0, "readv() with 0 I/O vectors"},
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{&rd_iovec, 3, CHUNK, "readv() with NULL I/O vectors"},
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{&big_iovec, 2, CHUNK, "readv() with too big I/O vectors"},
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{&multi_iovec, 2, 3*CHUNK/4, "readv() with multiple I/O vectors"},
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{&lockup_iovec, 2, CHUNK, "readv() with zero-len buffer"},
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};
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static void test_readv(unsigned int n)
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{
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int i, fpos, fail = 0;
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size_t j;
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char *ptr;
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const struct testcase *tc = testcase_list + n;
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struct iovec *vec;
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SAFE_LSEEK(fd, 0, SEEK_SET);
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vec = *tc->iov;
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for (i = 0; i < tc->iov_count; i++) {
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if (vec[i].iov_base && vec[i].iov_len)
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memset(vec[i].iov_base, 0, vec[i].iov_len);
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}
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TEST(readv(fd, vec, tc->iov_count));
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if (TST_RET == -1)
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tst_res(TFAIL | TTERRNO, "readv() failed unexpectedly");
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else if (TST_RET < 0)
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tst_res(TFAIL | TTERRNO, "readv() returned invalid value");
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else if (TST_RET != tc->exp_ret)
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tst_res(TFAIL, "readv() returned unexpected value %ld",
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TST_RET);
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if (TST_RET != tc->exp_ret)
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return;
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tst_res(TPASS, "%s", tc->name);
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for (i = 0, fpos = 0; i < tc->iov_count; i++) {
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ptr = vec[i].iov_base;
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for (j = 0; j < vec[i].iov_len; j++, fpos++) {
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if (ptr[j] != (fpos < tc->exp_ret ? 0x42 : 0))
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fail++;
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}
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}
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if (fail)
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tst_res(TFAIL, "Wrong buffer content");
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else
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tst_res(TPASS, "readv() correctly read %d bytes ", tc->exp_ret);
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}
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static void setup(void)
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{
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/* replace the default NULL pointer with invalid address */
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lockup_iovec[0].iov_base = tst_get_bad_addr(NULL);
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memset(buf, 0x42, sizeof(buf));
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fd = SAFE_OPEN("data_file", O_WRONLY | O_CREAT | O_TRUNC, 0666);
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SAFE_WRITE(1, fd, buf, sizeof(buf));
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SAFE_CLOSE(fd);
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fd = SAFE_OPEN("data_file", O_RDONLY);
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}
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static void cleanup(void)
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{
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if (fd >= 0)
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SAFE_CLOSE(fd);
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}
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static struct tst_test test = {
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.setup = setup,
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.cleanup = cleanup,
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.test = test_readv,
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.tcnt = ARRAY_SIZE(testcase_list),
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.needs_tmpdir = 1,
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.timeout = 15,
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.tags = (const struct tst_tag[]) {
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{"linux-git", "19f18459330f"},
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{}
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},
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.bufs = (struct tst_buffers[]) {
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{&rd_iovec, .iov_sizes = (int[]){CHUNK, 0, 0, -1}},
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{&big_iovec, .iov_sizes = (int[]){2*CHUNK, CHUNK, -1}},
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{&multi_iovec, .iov_sizes = (int[]){CHUNK/4, CHUNK/2, -1}},
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{&lockup_iovec, .iov_sizes = (int[]){0, CHUNK, -1}},
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{}
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}
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};
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