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/*
* Copyright 2021 The Emscripten Authors. All rights reserved.
* Emscripten is available under two separate licenses, the MIT license and the
* University of Illinois/NCSA Open Source License. Both these licenses can be
* found in the LICENSE file.
*/
#include <assert.h>
#include <emscripten/emscripten.h>
#include <emscripten/wasmfs.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
void write_and_read(const char* msg, int fd) {
char buf[200] = {};
errno = 0;
write(fd, msg, strlen(msg));
assert(errno == 0);
errno = 0;
lseek(fd, 0, SEEK_SET);
assert(errno == 0);
read(fd, buf, sizeof(buf));
assert(errno == 0);
printf("%s\n", buf);
}
static backend_t make_js_file_backend(void* arg) {
return wasmfs_create_js_file_backend();
}
int main() {
backend_t backend;
#ifndef PROXYING
backend = make_js_file_backend(NULL);
#else
backend = wasmfs_create_proxied_backend(make_js_file_backend, NULL);
#endif
// Create a new backend file under root.
int fd = wasmfs_create_file("/testfile", 0777, backend);
// Ensure that the size of the backend file is zero.
struct stat file;
assert(fstat(fd, &file) != -1);
assert(file.st_size == 0);
// Try writing to and reading from the file.
const char* msg = "Test with a new backend file\n";
write_and_read(msg, fd);
// Verify that the size of the backend File is the same as the written buffer.
assert(fstat(fd, &file) != -1);
assert(file.st_size == strlen(msg));
// Try seeking to the beginning of the file and overwriting its contents.
assert(lseek(fd, 0, SEEK_SET) != -1);
write_and_read(msg, fd);
// Try appending to the end of the backend File.
write_and_read(msg, fd);
// Verify that the size of the backend File has increased.
assert(fstat(fd, &file) != -1);
assert(file.st_size == strlen(msg) * 2);
close(fd);
assert(unlink("/testfile") != -1);
// Try creating a new backend directory under root.
assert(wasmfs_create_directory("/test-dir", 0777, backend) != -1);
// Try to create a new backend file under this new directory.
int fd2 = open("/test-dir/backendfile", O_RDWR | O_CREAT, 0777);
// Try writing to and reading from the file.
const char* msg2 =
"Test with a backend file created under a backend directory\n";
write_and_read(msg2, fd2);
// Check that the backend file has the correct backend type.
assert(wasmfs_get_backend_by_fd(fd2) == backend);
// Try creating an in-memory file under a backend directory.
backend_t memoryBackend = wasmfs_get_backend_by_path("/");
int fd3 = wasmfs_create_file("/test-dir/inmemoryfile", 0777, memoryBackend);
const char* msg3 =
"Test with an in-memory file created under a backend directory\n";
write_and_read(msg3, fd3);
// Create a new backend file under root.
int fd4 = wasmfs_create_file("/testfile2", 0777, backend);
const char* msg4 = "Test with a backend file created under root\n";
// Try setting the file offset to an arbitrary value.
assert(lseek(fd4, 10, SEEK_SET) != -1);
char buf[200] = {};
errno = 0;
write(fd4, msg4, strlen(msg4));
assert(errno == 0);
errno = 0;
lseek(fd4, 0, SEEK_SET);
assert(errno == 0);
int bytesRead = read(fd4, buf, sizeof(buf));
for (ssize_t i = 0; i < bytesRead; i++) {
if (buf[i] == 0) {
printf("\\0");
} else {
printf("%c", buf[i]);
}
}
printf("\n");
return 0;
}
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