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/*
* io_uring_setup.c
*
* Description: Unit tests for the io_uring_setup system call.
*
* Copyright 2019, Red Hat, Inc.
* Author: Jeff Moyer <jmoyer@redhat.com>
*/
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/sysinfo.h>
#include "liburing.h"
/*
* Attempt the call with the given args. Return 0 when expect matches
* the return value of the system call, 1 otherwise.
*/
char *
flags_string(struct io_uring_params *p)
{
static char flagstr[64];
int add_pipe = 0;
memset(flagstr, 0, sizeof(flagstr));
if (!p || p->flags == 0)
return "none";
/*
* If unsupported flags are present, just print the bitmask.
*/
if (p->flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL |
IORING_SETUP_SQ_AFF)) {
snprintf(flagstr, 64, "0x%.8x", p->flags);
return flagstr;
}
if (p->flags & IORING_SETUP_IOPOLL) {
strncat(flagstr, "IORING_SETUP_IOPOLL", 64 - strlen(flagstr));
add_pipe = 1;
}
if (p->flags & IORING_SETUP_SQPOLL) {
if (add_pipe)
strncat(flagstr, "|", 64 - strlen(flagstr));
else
add_pipe = 1;
strncat(flagstr, "IORING_SETUP_SQPOLL", 64 - strlen(flagstr));
}
if (p->flags & IORING_SETUP_SQ_AFF) {
if (add_pipe)
strncat(flagstr, "|", 64 - strlen(flagstr));
strncat(flagstr, "IORING_SETUP_SQ_AFF", 64 - strlen(flagstr));
}
return flagstr;
}
char *
dump_resv(struct io_uring_params *p)
{
static char resvstr[4096];
if (!p)
return "";
sprintf(resvstr, "0x%.8x 0x%.8x 0x%.8x 0x%.8x 0x%.8x", p->resv[0],
p->resv[1], p->resv[2], p->resv[3], p->resv[4]);
return resvstr;
}
/* bogus: setup returns a valid fd on success... expect can't predict the
fd we'll get, so this really only takes 1 parameter: error */
int
try_io_uring_setup(unsigned entries, struct io_uring_params *p, int expect, int error)
{
int ret, __errno;
printf("io_uring_setup(%u, %p), flags: %s, resv: %s, sq_thread_cpu: %u\n",
entries, p, flags_string(p), dump_resv(p),
p ? p->sq_thread_cpu : 0);
ret = io_uring_setup(entries, p);
if (ret != expect) {
printf("expected %d, got %d\n", expect, ret);
/* if we got a valid uring, close it */
if (ret > 0)
close(ret);
return 1;
}
__errno = errno;
if (expect == -1 && error != __errno) {
if (__errno == EPERM && geteuid() != 0) {
printf("Needs root, not flagging as an error\n");
return 0;
}
printf("expected errno %d, got %d\n", error, __errno);
return 1;
}
return 0;
}
int
main(int argc, char **argv)
{
int fd;
unsigned int status = 0;
struct io_uring_params p;
memset(&p, 0, sizeof(p));
status |= try_io_uring_setup(0, &p, -1, EINVAL);
status |= try_io_uring_setup(1, NULL, -1, EFAULT);
/* resv array is non-zero */
memset(&p, 0, sizeof(p));
p.resv[0] = p.resv[1] = p.resv[2] = p.resv[3] = p.resv[4] = 1;
status |= try_io_uring_setup(1, &p, -1, EINVAL);
/* invalid flags */
memset(&p, 0, sizeof(p));
p.flags = ~0U;
status |= try_io_uring_setup(1, &p, -1, EINVAL);
/* IORING_SETUP_SQ_AFF set but not IORING_SETUP_SQPOLL */
memset(&p, 0, sizeof(p));
p.flags = IORING_SETUP_SQ_AFF;
status |= try_io_uring_setup(1, &p, -1, EINVAL);
/* attempt to bind to invalid cpu */
memset(&p, 0, sizeof(p));
p.flags = IORING_SETUP_SQPOLL | IORING_SETUP_SQ_AFF;
p.sq_thread_cpu = get_nprocs_conf();
status |= try_io_uring_setup(1, &p, -1, EINVAL);
/* I think we can limit a process to a set of cpus. I assume
* we shouldn't be able to setup a kernel thread outside of that.
* try to do that. (task->cpus_allowed) */
/* read/write on io_uring_fd */
memset(&p, 0, sizeof(p));
fd = io_uring_setup(1, &p);
if (fd < 0) {
printf("io_uring_setup failed with %d, expected success\n",
errno);
status = 1;
} else {
char buf[4096];
int ret;
ret = read(fd, buf, 4096);
if (ret >= 0) {
printf("read from io_uring fd succeeded. expected fail\n");
status = 1;
}
}
if (!status) {
printf("PASS\n");
return 0;
}
printf("FAIL\n");
return -1;
}
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