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wasi.c
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wasi.c
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/*
* WASI implementation for toywasm
*
* This is a bit relaxed implementation of WASI preview1.
*
* - The "rights" stuff is not implemented. mendokusai.
*
* - The "openat" family API is intentionally not used in favor
* of portability.
* Note: It makes this implementation considerably complex/incomplete
* in some places because WASI is basically a copy of the openat API
* family.
*
* References:
* https://github.com/WebAssembly/WASI/tree/main/phases/snapshot/witx
* https://github.com/WebAssembly/wasi-libc/blob/main/libc-bottom-half/headers/public/wasi/api.h
*/
#define _POSIX_C_SOURCE 199309 /* clock_gettime */
#define _DARWIN_C_SOURCE /* arc4random_buf */
#define _GNU_SOURCE /* asprintf, realpath, O_DIRECTORY */
#if defined(__NuttX__)
#include <nuttx/config.h>
#endif
#include <sys/random.h> /* getrandom */
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <limits.h>
#include <poll.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "context.h"
#include "endian.h"
#include "host_instance.h"
#include "lock.h"
#include "type.h"
#include "util.h"
#include "vec.h"
#include "wasi.h"
#include "wasi_abi.h"
#include "wasi_impl.h"
#include "xlog.h"
struct wasi_fdinfo {
/*
* - directories added by wasi_instance_prestat_add
* prestat_path != NULL
* hostfd == -1 (for now)
*
* - files opened by user
* prestat_path == NULL
* hostfd != -1
*
* - closed descriptors (EBADF)
* prestat_path == NULL
* hostfd == -1
*/
char *prestat_path;
int hostfd;
DIR *dir;
uint32_t refcount;
};
struct wasi_instance {
struct host_instance hi;
TOYWASM_MUTEX_DEFINE(lock);
#if defined(TOYWASM_ENABLE_WASM_THREADS)
pthread_cond_t cv;
#endif
VEC(, struct wasi_fdinfo *) fdtable; /* indexed by wasi fd */
int argc;
char *const *argv;
int nenvs;
char *const *envs;
};
#if defined(__wasi__)
#if !defined(AT_FDCWD)
/* a workaroud for wasi-sdk-8.0 which we use for wapm */
#define TOYWASM_OLD_WASI_LIBC
#endif
/*
* For some reasons, wasi-libc doesn't have legacy stuff enabled.
* It includes lutimes and futimes.
*/
static int
lutimes(const char *path, const struct timeval *tvp)
{
#if defined(TOYWASM_OLD_WASI_LIBC)
errno = ENOSYS;
return -1;
#else
struct timespec ts[2];
const struct timespec *tsp;
if (tvp != NULL) {
ts[0].tv_sec = tvp[0].tv_sec;
ts[0].tv_nsec = tvp[0].tv_usec * 1000;
ts[1].tv_sec = tvp[1].tv_sec;
ts[1].tv_nsec = tvp[1].tv_usec * 1000;
tsp = ts;
} else {
tsp = NULL;
}
return utimensat(AT_FDCWD, path, tsp, AT_SYMLINK_NOFOLLOW);
#endif
}
static int
futimes(int fd, const struct timeval *tvp)
{
struct timespec ts[2];
const struct timespec *tsp;
if (tvp != NULL) {
ts[0].tv_sec = tvp[0].tv_sec;
ts[0].tv_nsec = tvp[0].tv_usec * 1000;
ts[1].tv_sec = tvp[1].tv_sec;
ts[1].tv_nsec = tvp[1].tv_usec * 1000;
tsp = ts;
} else {
tsp = NULL;
}
return futimens(fd, tsp);
}
#endif
#if defined(__APPLE__)
static int
racy_fallocate(int fd, off_t offset, off_t size)
{
struct stat sb;
int ret;
off_t newsize = offset + size;
if (newsize < offset) {
return EOVERFLOW;
}
ret = fstat(fd, &sb);
if (ret != 0) {
ret = errno;
assert(ret > 0);
return ret;
}
if (sb.st_size >= newsize) {
return 0;
}
ret = ftruncate(fd, newsize);
if (ret != 0) {
ret = errno;
assert(ret > 0);
}
return ret;
}
#endif
#if defined(__NuttX__) && !defined(CONFIG_PSEUDOFS_SOFTLINKS)
int
symlink(const char *path1, const char *path2)
{
errno = ENOSYS;
return -1;
}
ssize_t
readlink(const char *path, char *buf, size_t buflen)
{
errno = ENOSYS;
return -1;
}
#endif
static bool
fdinfo_is_prestat(const struct wasi_fdinfo *fdinfo)
{
return fdinfo->hostfd == -1 && fdinfo->prestat_path != NULL;
}
static int
wasi_copyin(struct exec_context *ctx, void *hostaddr, uint32_t wasmaddr,
size_t len)
{
void *p;
int ret;
ret = memory_getptr(ctx, 0, wasmaddr, 0, len, &p);
if (ret != 0) {
return ret;
}
memcpy(hostaddr, p, len);
return 0;
}
static int
wasi_copyout(struct exec_context *ctx, const void *hostaddr, uint32_t wasmaddr,
size_t len)
{
void *p;
int ret;
ret = memory_getptr(ctx, 0, wasmaddr, 0, len, &p);
if (ret != 0) {
return ret;
}
memcpy(p, hostaddr, len);
return 0;
}
static int
wasi_copyin_iovec(struct exec_context *ctx, uint32_t iov_uaddr,
uint32_t iov_count, struct iovec **resultp)
{
struct iovec *hostiov = NULL;
void *p;
int ret;
if (iov_count == 0) {
ret = EINVAL;
goto fail;
}
hostiov = calloc(iov_count, sizeof(*hostiov));
if (hostiov == NULL) {
ret = ENOMEM;
goto fail;
}
retry:
ret = memory_getptr(ctx, 0, iov_uaddr, 0,
iov_count * sizeof(struct wasi_iov), &p);
if (ret != 0) {
goto fail;
}
const struct wasi_iov *iov_in_module = p;
uint32_t i;
for (i = 0; i < iov_count; i++) {
bool moved = false;
uint32_t iov_base = le32_decode(&iov_in_module[i].iov_base);
uint32_t iov_len = le32_decode(&iov_in_module[i].iov_len);
xlog_trace("iov [%" PRIu32 "] base %" PRIx32 " len %" PRIu32,
i, iov_base, iov_len);
ret = memory_getptr2(ctx, 0, iov_base, 0, iov_len, &p, &moved);
if (ret != 0) {
goto fail;
}
if (moved) {
goto retry;
}
hostiov[i].iov_base = p;
hostiov[i].iov_len = iov_len;
}
*resultp = hostiov;
return 0;
fail:
free(hostiov);
return ret;
}
static bool
wasi_fdinfo_unused(struct wasi_fdinfo *fdinfo)
{
return fdinfo->hostfd == -1 && fdinfo->prestat_path == NULL;
}
static struct wasi_fdinfo *
wasi_fdinfo_alloc(void)
{
struct wasi_fdinfo *fdinfo = zalloc(sizeof(*fdinfo));
if (fdinfo == NULL) {
return NULL;
}
fdinfo->hostfd = -1;
fdinfo->dir = NULL;
fdinfo->prestat_path = NULL;
fdinfo->refcount = 0;
assert(wasi_fdinfo_unused(fdinfo));
return fdinfo;
}
static void
wasi_fd_affix(struct wasi_instance *wasi, uint32_t wasifd,
struct wasi_fdinfo *fdinfo)
{
assert(wasifd < wasi->fdtable.lsize);
struct wasi_fdinfo **slot = &VEC_ELEM(wasi->fdtable, wasifd);
struct wasi_fdinfo *ofdinfo = *slot;
assert(ofdinfo == NULL || wasi_fdinfo_unused(ofdinfo));
assert(fdinfo->refcount < UINT32_MAX);
fdinfo->refcount++;
*slot = fdinfo;
free(ofdinfo);
}
static int
wasi_fd_lookup_locked(struct wasi_instance *wasi, uint32_t wasifd,
struct wasi_fdinfo **infop)
{
struct wasi_fdinfo *fdinfo;
if (wasifd >= wasi->fdtable.lsize) {
return EBADF;
}
fdinfo = VEC_ELEM(wasi->fdtable, wasifd);
if (fdinfo == NULL) {
fdinfo = wasi_fdinfo_alloc();
if (fdinfo == NULL) {
return ENOMEM;
}
wasi_fd_affix(wasi, wasifd, fdinfo);
}
assert(fdinfo->refcount < UINT32_MAX); /* XXX */
fdinfo->refcount++;
*infop = fdinfo;
return 0;
}
static int
wasi_fd_lookup(struct wasi_instance *wasi, uint32_t wasifd,
struct wasi_fdinfo **infop)
{
toywasm_mutex_lock(&wasi->lock);
int ret = wasi_fd_lookup_locked(wasi, wasifd, infop);
toywasm_mutex_unlock(&wasi->lock);
return ret;
}
static void
wasi_fdinfo_release(struct wasi_instance *wasi, struct wasi_fdinfo *fdinfo)
{
if (fdinfo == NULL) {
return;
}
toywasm_mutex_lock(&wasi->lock);
assert(fdinfo->refcount > 0);
fdinfo->refcount--;
#if defined(TOYWASM_ENABLE_WASM_THREADS)
if (fdinfo->refcount == 1) {
/* wake up drain */
int ret = pthread_cond_signal(&wasi->cv);
assert(ret == 0);
}
#endif
if (fdinfo->refcount == 0) {
assert(fdinfo->hostfd == -1);
free(fdinfo->prestat_path);
free(fdinfo);
}
toywasm_mutex_unlock(&wasi->lock);
}
static void
wasi_fdinfo_drain(struct wasi_instance *wasi, struct wasi_fdinfo *fdinfo)
{
/* called with wasi->lock held */
while (true) {
assert(fdinfo->refcount >= 1);
if (fdinfo->refcount == 1) {
break;
}
#if defined(TOYWASM_ENABLE_WASM_THREADS)
int ret = pthread_cond_wait(&wasi->cv, &wasi->lock.lock);
assert(ret == 0);
#else
assert(false);
#endif
}
}
static int
wasi_fdinfo_close(struct wasi_fdinfo *fdinfo)
{
int ret = 0;
int hostfd = fdinfo->hostfd;
#if defined(__wasi__) /* wasi has no dup */
if (hostfd != -1 && hostfd >= 3) {
#else
if (hostfd != -1) {
#endif
ret = close(fdinfo->hostfd);
}
fdinfo->hostfd = -1;
if (fdinfo->dir != NULL) {
closedir(fdinfo->dir);
}
fdinfo->dir = NULL;
free(fdinfo->prestat_path);
fdinfo->prestat_path = NULL;
return ret;
}
static int
wasi_hostfd_lookup(struct wasi_instance *wasi, uint32_t wasifd, int *hostfdp,
struct wasi_fdinfo **fdinfop)
{
struct wasi_fdinfo *info;
int ret = wasi_fd_lookup(wasi, wasifd, &info);
if (ret != 0) {
return ret;
}
if (info->hostfd == -1) {
wasi_fdinfo_release(wasi, info);
return EBADF;
}
*hostfdp = info->hostfd;
*fdinfop = info;
return 0;
}
static int
wasi_fdtable_expand(struct wasi_instance *wasi, uint32_t maxfd)
{
/* called with wasi->lock held */
uint32_t osize = wasi->fdtable.lsize;
if (maxfd < osize) {
return 0;
}
int ret = VEC_RESIZE(wasi->fdtable, maxfd + 1);
if (ret != 0) {
return ret;
}
uint32_t i;
for (i = osize; i <= maxfd; i++) {
VEC_ELEM(wasi->fdtable, i) = NULL;
}
return 0;
}
static void
wasi_fdtable_free(struct wasi_instance *wasi)
{
struct wasi_fdinfo **it;
uint32_t i;
VEC_FOREACH_IDX(i, it, wasi->fdtable) {
struct wasi_fdinfo *fdinfo = *it;
if (fdinfo == NULL) {
continue;
}
#if defined(TOYWASM_ENABLE_TRACING)
int hostfd = fdinfo->hostfd;
#endif
int ret = wasi_fdinfo_close(fdinfo);
if (ret != 0) {
xlog_trace("failed to close: wasm fd %" PRIu32
" host fd %u with errno %d",
i, hostfd, errno);
}
free(fdinfo);
}
VEC_FREE(wasi->fdtable);
}
static int
wasi_fd_alloc(struct wasi_instance *wasi, uint32_t *wasifdp)
{
/* called with wasi->lock held */
struct wasi_fdinfo **fdinfop;
uint32_t wasifd;
VEC_FOREACH_IDX(wasifd, fdinfop, wasi->fdtable) {
struct wasi_fdinfo *fdinfo = *fdinfop;
if (fdinfo == NULL || wasi_fdinfo_unused(fdinfo)) {
*wasifdp = wasifd;
return 0;
}
}
wasifd = wasi->fdtable.lsize;
int ret = wasi_fdtable_expand(wasi, wasifd);
if (ret != 0) {
return ret;
}
struct wasi_fdinfo *fdinfo = VEC_ELEM(wasi->fdtable, wasifd);
assert(fdinfo == NULL);
*wasifdp = wasifd;
return 0;
}
static int
wasi_fd_add(struct wasi_instance *wasi, int hostfd, char *path,
uint32_t *wasifdp)
{
struct wasi_fdinfo *fdinfo;
uint32_t wasifd;
int ret;
fdinfo = wasi_fdinfo_alloc();
if (fdinfo == NULL) {
free(path);
return ENOMEM;
}
fdinfo->hostfd = hostfd;
fdinfo->dir = NULL;
fdinfo->prestat_path = path;
toywasm_mutex_lock(&wasi->lock);
ret = wasi_fd_alloc(wasi, &wasifd);
if (ret != 0) {
toywasm_mutex_unlock(&wasi->lock);
free(path);
free(fdinfo);
return ret;
}
wasi_fd_affix(wasi, wasifd, fdinfo);
toywasm_mutex_unlock(&wasi->lock);
*wasifdp = wasifd;
return 0;
}
static uint64_t
timespec_to_ns(const struct timespec *ts)
{
return (uint64_t)ts->tv_sec * 1000000000 + ts->tv_nsec;
}
static void
timeval_from_ns(struct timeval *tv, uint64_t ns)
{
tv->tv_sec = ns / 1000000000;
tv->tv_usec = (ns % 1000000000) / 1000;
}
static int
prepare_utimes_tv(uint32_t fstflags, uint64_t atim, uint64_t mtim,
struct timeval tvstore[2], const struct timeval **resultp)
{
const struct timeval *tvp;
if (fstflags == (WASI_FSTFLAG_ATIM_NOW | WASI_FSTFLAG_MTIM_NOW)) {
tvp = NULL;
} else if (fstflags == (WASI_FSTFLAG_ATIM | WASI_FSTFLAG_MTIM)) {
timeval_from_ns(&tvstore[0], atim);
timeval_from_ns(&tvstore[1], mtim);
tvp = tvstore;
} else {
return ENOTSUP;
}
*resultp = tvp;
return 0;
}
static uint8_t
wasi_convert_filetype(mode_t mode)
{
uint8_t type;
if (S_ISREG(mode)) {
type = WASI_FILETYPE_REGULAR_FILE;
} else if (S_ISDIR(mode)) {
type = WASI_FILETYPE_DIRECTORY;
} else if (S_ISCHR(mode)) {
type = WASI_FILETYPE_CHARACTER_DEVICE;
} else if (S_ISBLK(mode)) {
type = WASI_FILETYPE_BLOCK_DEVICE;
} else if (S_ISLNK(mode)) {
type = WASI_FILETYPE_SYMBOLIC_LINK;
} else {
type = WASI_FILETYPE_UNKNOWN;
}
return type;
}
static void
wasi_convert_filestat(const struct stat *hst, struct wasi_filestat *wst)
{
memset(wst, 0, sizeof(*wst));
wst->dev = host_to_le64(hst->st_dev);
wst->ino = host_to_le64(hst->st_ino);
wst->type = wasi_convert_filetype(hst->st_mode);
wst->linkcount = host_to_le64(hst->st_nlink);
wst->size = host_to_le64(hst->st_size);
#if defined(__APPLE__)
wst->atim = host_to_le64(timespec_to_ns(&hst->st_atimespec));
wst->mtim = host_to_le64(timespec_to_ns(&hst->st_mtimespec));
wst->ctim = host_to_le64(timespec_to_ns(&hst->st_ctimespec));
#else
wst->atim = host_to_le64(timespec_to_ns(&hst->st_atim));
wst->mtim = host_to_le64(timespec_to_ns(&hst->st_mtim));
wst->ctim = host_to_le64(timespec_to_ns(&hst->st_ctim));
#endif
}
static uint8_t
wasi_convert_dirent_filetype(uint8_t hosttype)
{
uint8_t t;
switch (hosttype) {
case DT_REG:
t = WASI_FILETYPE_REGULAR_FILE;
break;
case DT_DIR:
t = WASI_FILETYPE_DIRECTORY;
break;
case DT_CHR:
t = WASI_FILETYPE_CHARACTER_DEVICE;
break;
case DT_BLK:
t = WASI_FILETYPE_BLOCK_DEVICE;
break;
case DT_LNK:
t = WASI_FILETYPE_SYMBOLIC_LINK;
break;
case DT_UNKNOWN:
default:
t = WASI_FILETYPE_UNKNOWN;
break;
}
return t;
}
static int
wasi_copyin_and_convert_path(struct exec_context *ctx,
struct wasi_instance *wasi, uint32_t dirwasifd,
uint32_t path, uint32_t pathlen, char **wasmpathp,
char **hostpathp)
{
/*
* TODO: somehow prevent it from escaping the dirwasifd directory.
* eg. reject too many ".."s, check symlinks, etc
*/
char *hostpath = NULL;
char *wasmpath = NULL;
struct wasi_fdinfo *dirfdinfo = NULL;
int ret;
wasmpath = malloc(pathlen + 1);
if (wasmpath == NULL) {
ret = ENOMEM;
goto fail;
}
ret = wasi_copyin(ctx, wasmpath, path, pathlen);
if (ret != 0) {
goto fail;
}
wasmpath[pathlen] = 0;
if (strlen(wasmpath) != pathlen) {
/* Note: wasmtime returns EINVAL for embedded NULs */
ret = EINVAL;
goto fail;
}
if (wasmpath[0] == '/') {
ret = EPERM;
goto fail;
}
ret = wasi_fd_lookup(wasi, dirwasifd, &dirfdinfo);
if (ret != 0) {
goto fail;
}
if (dirfdinfo->prestat_path == NULL) {
ret = EBADF;
goto fail;
}
ret = asprintf(&hostpath, "%s/%s", dirfdinfo->prestat_path, wasmpath);
if (ret < 0) {
ret = errno;
assert(ret > 0);
goto fail;
}
wasi_fdinfo_release(wasi, dirfdinfo);
*hostpathp = hostpath;
*wasmpathp = wasmpath;
return 0;
fail:
wasi_fdinfo_release(wasi, dirfdinfo);
free(hostpath);
free(wasmpath);
return ret;
}
static int
wasi_convert_clockid(uint32_t clockid, clockid_t *hostidp)
{
clockid_t hostclockid;
int ret = 0;
switch (clockid) {
case WASI_CLOCK_ID_REALTIME:
hostclockid = CLOCK_REALTIME;
break;
case WASI_CLOCK_ID_MONOTONIC:
hostclockid = CLOCK_MONOTONIC;
break;
#if defined(CLOCK_PROCESS_CPUTIME_ID)
case WASI_CLOCK_ID_PROCESS_CPUTIME_ID:
/* REVISIT what does this really mean for wasm? */
hostclockid = CLOCK_PROCESS_CPUTIME_ID;
break;
#endif
#if defined(CLOCK_THREAD_CPUTIME_ID)
case WASI_CLOCK_ID_THREAD_CPUTIME_ID:
/* REVISIT what does this really mean for wasm? */
hostclockid = CLOCK_THREAD_CPUTIME_ID;
break;
#endif
default:
ret = EINVAL;
goto fail;
}
*hostidp = hostclockid;
return 0;
fail:
return ret;
}
uint32_t
wasi_convert_errno(int host_errno)
{
/* TODO implement */
uint32_t wasmerrno;
switch (host_errno) {
case 0:
wasmerrno = 0;
break;
case EACCES:
wasmerrno = 2;
break;
case EAGAIN:
wasmerrno = 6;
break;
case EBADF:
wasmerrno = 8;
break;
case EEXIST:
wasmerrno = 20;
break;
case EINTR:
wasmerrno = 27;
break;
case EINVAL:
wasmerrno = 28;
break;
case EISDIR:
wasmerrno = 31;
break;
case ELOOP:
wasmerrno = 32;
break;
case ENOENT:
wasmerrno = 44;
break;
case ENOTDIR:
wasmerrno = 54;
break;
case ENOTEMPTY:
wasmerrno = 55;
break;
case ENOTSUP:
wasmerrno = 58;
break;
case EPERM:
wasmerrno = 63;
break;
case ERANGE:
wasmerrno = 68;
break;
#if defined(ENOTCAPABLE)
case ENOTCAPABLE:
wasmerrno = 76;
break;
#endif
default:
wasmerrno = 29; /* EIO */
}
xlog_trace("error converted from %u to %" PRIu32, host_errno,
wasmerrno);
return wasmerrno;
}
static int
wasi_proc_exit(struct exec_context *ctx, struct host_instance *hi,
const struct functype *ft, const struct cell *params,
struct cell *results)
{
WASI_TRACE;
HOST_FUNC_CONVERT_PARAMS(ft, params);
uint32_t code = HOST_FUNC_PARAM(ft, params, 0, i32);
ctx->exit_code = code;
return trap_with_id(ctx, TRAP_VOLUNTARY_EXIT,
"proc_exit with %" PRIu32, code);
}
static int
wasi_fd_advise(struct exec_context *ctx, struct host_instance *hi,
const struct functype *ft, const struct cell *params,
struct cell *results)
{
WASI_TRACE;
struct wasi_instance *wasi = (void *)hi;
HOST_FUNC_CONVERT_PARAMS(ft, params);
uint32_t wasifd = HOST_FUNC_PARAM(ft, params, 0, i32);
#if 0
uint64_t offset = HOST_FUNC_PARAM(ft, params, 1, i64);
uint64_t len = HOST_FUNC_PARAM(ft, params, 2, i64);
uint32_t adv = HOST_FUNC_PARAM(ft, params, 3, i32);
#endif
struct wasi_fdinfo *fdinfo;
int hostfd;
int ret;
ret = wasi_hostfd_lookup(wasi, wasifd, &hostfd, &fdinfo);
if (ret != 0) {
goto fail;
}
ret = 0;
/* no-op */
fail:
wasi_fdinfo_release(wasi, fdinfo);
HOST_FUNC_RESULT_SET(ft, results, 0, i32, wasi_convert_errno(ret));
return 0;
}
static int
wasi_fd_allocate(struct exec_context *ctx, struct host_instance *hi,
const struct functype *ft, const struct cell *params,
struct cell *results)
{
WASI_TRACE;
struct wasi_instance *wasi = (void *)hi;
HOST_FUNC_CONVERT_PARAMS(ft, params);
uint32_t wasifd = HOST_FUNC_PARAM(ft, params, 0, i32);
uint64_t offset = HOST_FUNC_PARAM(ft, params, 1, i64);
uint64_t len = HOST_FUNC_PARAM(ft, params, 2, i64);
struct wasi_fdinfo *fdinfo;
int hostfd;
int ret;
ret = wasi_hostfd_lookup(wasi, wasifd, &hostfd, &fdinfo);
if (ret != 0) {
goto fail;
}
/*
* macOS doesn't have posix_fallocate
* cf. https://github.com/WebAssembly/wasi-filesystem/issues/19
*/
#if defined(__APPLE__)
ret = racy_fallocate(hostfd, offset, len);
#else
ret = posix_fallocate(hostfd, offset, len);
#endif
fail:
wasi_fdinfo_release(wasi, fdinfo);
HOST_FUNC_RESULT_SET(ft, results, 0, i32, wasi_convert_errno(ret));
return 0;
}
static int
wasi_fd_filestat_set_size(struct exec_context *ctx, struct host_instance *hi,
const struct functype *ft, const struct cell *params,
struct cell *results)
{
WASI_TRACE;
struct wasi_instance *wasi = (void *)hi;
HOST_FUNC_CONVERT_PARAMS(ft, params);
uint32_t wasifd = HOST_FUNC_PARAM(ft, params, 0, i32);
uint64_t size = HOST_FUNC_PARAM(ft, params, 1, i64);
struct wasi_fdinfo *fdinfo;
int hostfd;
int ret;
ret = wasi_hostfd_lookup(wasi, wasifd, &hostfd, &fdinfo);
if (ret != 0) {
goto fail;
}
xlog_trace("ftruncate wasifd %" PRIu32 " hostfd %d size %" PRIu64,
wasifd, hostfd, size);
ret = ftruncate(hostfd, size);
if (ret == -1) {
ret = errno;
assert(ret > 0);
}
fail:
wasi_fdinfo_release(wasi, fdinfo);
HOST_FUNC_RESULT_SET(ft, results, 0, i32, wasi_convert_errno(ret));
return 0;
}
static int
wasi_fd_close(struct exec_context *ctx, struct host_instance *hi,
const struct functype *ft, const struct cell *params,
struct cell *results)
{
WASI_TRACE;
struct wasi_instance *wasi = (void *)hi;
HOST_FUNC_CONVERT_PARAMS(ft, params);
uint32_t wasifd = HOST_FUNC_PARAM(ft, params, 0, i32);
struct wasi_fdinfo *fdinfo = NULL;
int ret;
toywasm_mutex_lock(&wasi->lock);
ret = wasi_fd_lookup_locked(wasi, wasifd, &fdinfo);
if (ret != 0) {
goto fail_locked;
}
if (fdinfo_is_prestat(fdinfo)) {
ret = ENOTSUP;
goto fail_locked;
}
if (fdinfo->hostfd == -1) {
ret = EBADF;
goto fail_locked;
}
assert(fdinfo->refcount >= 2);
fdinfo->refcount--;
assert(VEC_ELEM(wasi->fdtable, wasifd) == fdinfo);
VEC_ELEM(wasi->fdtable, wasifd) = NULL;
toywasm_mutex_unlock(&wasi->lock);
/*
* we simply make fd_close block until other threads finish working
* on the descriptor.
*
* note that we can't assume that the other threads will finish on
* the descriptor soon. actually they might keep using the
* descriptor very long or even forever. (poll, socket read, ...)
*
* when i have done some experiments with native pthreads
* decades ago, the behavior on concurrent close() was not
* very consistent among platforms. (Solaris/BSDs/Linux...)
* some of them block close() as we do here.
* others "interrupt" and make other non-close users fail.
*
* i guess portable applications should not rely on either
* behaviors.
*/
wasi_fdinfo_drain(wasi, fdinfo);
ret = wasi_fdinfo_close(fdinfo);
if (ret != 0) {
ret = errno;
assert(ret > 0);
goto fail;
}
ret = 0;
fail:
wasi_fdinfo_release(wasi, fdinfo);
HOST_FUNC_RESULT_SET(ft, results, 0, i32, wasi_convert_errno(ret));
return 0;
fail_locked:
toywasm_mutex_unlock(&wasi->lock);
goto fail;
}
static int
wasi_fd_write(struct exec_context *ctx, struct host_instance *hi,
const struct functype *ft, const struct cell *params,
struct cell *results)
{
WASI_TRACE;
struct wasi_instance *wasi = (void *)hi;
HOST_FUNC_CONVERT_PARAMS(ft, params);
uint32_t wasifd = HOST_FUNC_PARAM(ft, params, 0, i32);
uint32_t iov_addr = HOST_FUNC_PARAM(ft, params, 1, i32);
uint32_t iov_count = HOST_FUNC_PARAM(ft, params, 2, i32);
uint32_t retp = HOST_FUNC_PARAM(ft, params, 3, i32);
struct iovec *hostiov = NULL;
struct wasi_fdinfo *fdinfo = NULL;
int hostfd;
int ret;
if (iov_count > INT_MAX) {
ret = EOVERFLOW;
goto fail;
}
ret = wasi_hostfd_lookup(wasi, wasifd, &hostfd, &fdinfo);
if (ret != 0) {
goto fail;
}
ret = wasi_copyin_iovec(ctx, iov_addr, iov_count, &hostiov);
if (ret != 0) {
goto fail;
}
ssize_t n = writev(hostfd, hostiov, iov_count);
if (n == -1) {
ret = errno;
assert(ret > 0);
goto fail;
}
if (n > UINT32_MAX) {
ret = EOVERFLOW;
goto fail;
}
uint32_t r = host_to_le32(n);
ret = wasi_copyout(ctx, &r, retp, sizeof(r));
fail:
wasi_fdinfo_release(wasi, fdinfo);
HOST_FUNC_RESULT_SET(ft, results, 0, i32, wasi_convert_errno(ret));
free(hostiov);
return 0;
}
static int
wasi_fd_pwrite(struct exec_context *ctx, struct host_instance *hi,
const struct functype *ft, const struct cell *params,
struct cell *results)
{
WASI_TRACE;
struct wasi_instance *wasi = (void *)hi;
HOST_FUNC_CONVERT_PARAMS(ft, params);
uint32_t wasifd = HOST_FUNC_PARAM(ft, params, 0, i32);
uint32_t iov_addr = HOST_FUNC_PARAM(ft, params, 1, i32);
uint32_t iov_count = HOST_FUNC_PARAM(ft, params, 2, i32);
uint64_t offset = HOST_FUNC_PARAM(ft, params, 3, i64);
uint32_t retp = HOST_FUNC_PARAM(ft, params, 4, i32);