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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2020 Joyent, Inc.
*/
/*
* Some simple testing of the read/writev() family: specifically we're checking
* IOV_MAX == 1024, and that a large-file compiled 32-bit binary can correctly
* access certain offsets.
*/
#include <sys/uio.h>
#include <strings.h>
#include <limits.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <err.h>
#define ONE_GIG ((off_t)1024 * 1024 * 1024)
#define DATA_LEN (sizeof ("data"))
char path[] = "/var/tmp/writev_test.XXXXXX";
static void
cleanup(void)
{
(void) unlink(path);
}
int
main(int argc, char *argv[])
{
char data[(IOV_MAX + 1) * DATA_LEN] = "";
struct iovec iov[IOV_MAX + 1];
if (IOV_MAX != 1024)
errx(EXIT_FAILURE, "IOV_MAX != 1024");
int fd = mkstemp(path);
if (fd == -1)
err(EXIT_FAILURE, "failed to create file");
(void) atexit(cleanup);
int ret = ftruncate(fd, ONE_GIG * 8);
if (ret != 0)
err(EXIT_FAILURE, "failed to truncate file");
for (int i = 0; i < IOV_MAX + 1; i++) {
(void) strcpy(data + i * DATA_LEN, "data");
iov[i].iov_base = data + i * 5;
iov[i].iov_len = DATA_LEN;
}
ssize_t written = writev(fd, iov, IOV_MAX + 1);
if (written != -1 || errno != EINVAL)
errx(EXIT_FAILURE, "writev(IOV_MAX + 1) didn't fail properly");
written = writev(fd, iov, IOV_MAX);
if (written == -1)
err(EXIT_FAILURE, "writev failed");
bzero(data, sizeof (data));
ssize_t read = preadv(fd, iov, IOV_MAX, 0);
if (read != DATA_LEN * IOV_MAX)
err(EXIT_FAILURE, "preadv failed");
for (int i = 0; i < IOV_MAX; i++) {
if (strcmp(data + i * DATA_LEN, "data") != 0)
errx(EXIT_FAILURE, "bad read at 0x%lx", i * DATA_LEN);
}
/*
* Now test various "interesting" offsets.
*/
for (off_t off = 0; off < ONE_GIG * 8; off += ONE_GIG) {
if ((written = pwritev(fd, iov, 1, off)) != DATA_LEN)
err(EXIT_FAILURE, "pwritev(0x%lx) failed", off);
}
for (off_t off = 0; off < ONE_GIG * 8; off += ONE_GIG) {
if ((read = preadv(fd, iov, 1, off)) != DATA_LEN)
err(EXIT_FAILURE, "preadv(0x%lx) failed", off);
if (strcmp(data, "data") != 0)
errx(EXIT_FAILURE, "bad read at 0x%lx", off);
}
return (EXIT_SUCCESS);
}
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