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#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <emscripten.h>
int main() {
EM_ASM(
var major = 80;
var device = FS.makedev(major++, 0);
FS.registerDevice(device, {
open: function(stream) {
stream.payload = [65, 66, 67, 68];
},
read: function(stream, buffer, offset, length, pos) {
var bytesRead = 0;
for (var i = 0; i < length; i++) {
if (stream.payload.length) {
bytesRead++;
buffer[offset+i] = stream.payload.shift();
} else {
break;
}
}
return bytesRead;
},
write: function(stream, buffer, offset, length, pos) {
for (var i = 0; i < length; i++) {
Module.print('TO DEVICE: ' + buffer[offset+i]);
}
return i;
}
});
FS.mkdev('/device', device);
var broken_device = FS.makedev(major++, 0);
FS.registerDevice(broken_device, {
read: function(stream, buffer, offset, length, pos) {
throw new FS.ErrnoError(ERRNO_CODES.EIO);
},
write: function(stream, buffer, offset, length, pos) {
throw new FS.ErrnoError(ERRNO_CODES.EIO);
}
});
FS.mkdev('/broken-device', broken_device);
// NB: These are meant to test FS.createDevice specifically,
// and as such do not use registerDevice/mkdev
FS.createDevice('/', 'createDevice-read-only', function() {});
FS.createDevice('/', 'createDevice-write-only', null, function() {});
FS.mkdir('/folder', 0777);
FS.writeFile('/file', '1234567890');
);
char readBuffer[256] = {0};
char writeBuffer[] = "writeme";
int fl = open("/folder", O_RDWR);
printf("read from folder: %d\n", read(fl, readBuffer, sizeof readBuffer));
printf("errno: %d\n", errno);
errno = 0;
printf("write to folder: %d\n", write(fl, writeBuffer, sizeof writeBuffer));
printf("errno: %d\n\n", errno);
errno = 0;
int bd = open("/broken-device", O_RDWR);
printf("read from broken device: %d\n", read(bd, readBuffer, sizeof readBuffer));
printf("errno: %d\n", errno);
errno = 0;
printf("write to broken device: %d\n", write(bd, writeBuffer, sizeof writeBuffer));
printf("errno: %d\n\n", errno);
errno = 0;
int d = open("/device", O_RDWR);
printf("read from device: %d\n", read(d, readBuffer, sizeof readBuffer));
printf("data: %s\n", readBuffer);
memset(readBuffer, 0, sizeof readBuffer);
printf("errno: %d\n", errno);
errno = 0;
printf("write to device: %d\n", write(d, writeBuffer, sizeof writeBuffer));
printf("errno: %d\n\n", errno);
errno = 0;
int cd_ro_r = open("/createDevice-read-only", O_RDONLY);
printf("open read-only device from createDevice for read, errno: %d\n", errno);
errno = 0;
int cd_ro_w = open("/createDevice-read-only", O_WRONLY);
printf("open read-only device from createDevice for write, errno: %d\n", errno);
errno = 0;
int cd_wo_r = open("/createDevice-write-only", O_RDONLY);
printf("open write-only device from createDevice for read, errno: %d\n", errno);
errno = 0;
int cd_wo_w = open("/createDevice-write-only", O_WRONLY);
printf("open write-only device from createDevice for write, errno: %d\n\n", errno);
errno = 0;
int f = open("/file", O_RDWR);
printf("read from file: %d\n", read(f, readBuffer, sizeof readBuffer));
printf("data: %s\n", readBuffer);
memset(readBuffer, 0, sizeof readBuffer);
printf("errno: %d\n\n", errno);
errno = 0;
printf("seek: %d\n", lseek(f, 3, SEEK_SET));
printf("errno: %d\n\n", errno);
printf("partial read from file: %d\n", read(f, readBuffer, 3));
printf("data: %s\n", readBuffer);
memset(readBuffer, 0, sizeof readBuffer);
printf("errno: %d\n\n", errno);
errno = 0;
printf("seek: %d\n", lseek(f, -2, SEEK_END));
printf("errno: %d\n", errno);
errno = 0;
printf("partial read from end of file: %d\n", read(f, readBuffer, 3));
printf("data: %s\n", readBuffer);
memset(readBuffer, 0, sizeof readBuffer);
printf("errno: %d\n\n", errno);
errno = 0;
printf("seek: %d\n", lseek(f, -15, SEEK_CUR));
printf("errno: %d\n", errno);
errno = 0;
printf("partial read from before start of file: %d\n", read(f, readBuffer, 3));
printf("data: %s\n", readBuffer);
memset(readBuffer, 0, sizeof readBuffer);
printf("errno: %d\n\n", errno);
errno = 0;
printf("seek: %d\n", lseek(f, 0, SEEK_SET));
printf("write to start of file: %d\n", write(f, writeBuffer, 3));
printf("errno: %d\n\n", errno);
errno = 0;
printf("seek: %d\n", lseek(f, 0, SEEK_END));
printf("write to end of file: %d\n", write(f, writeBuffer, 3));
printf("errno: %d\n\n", errno);
errno = 0;
printf("seek: %d\n", lseek(f, 10, SEEK_END));
printf("write after end of file: %d\n", write(f, writeBuffer, sizeof writeBuffer));
printf("errno: %d\n\n", errno);
errno = 0;
int bytesRead;
printf("seek: %d\n", lseek(f, 0, SEEK_SET));
printf("read after write: %d\n", bytesRead = read(f, readBuffer, sizeof readBuffer));
printf("errno: %d\n", errno);
errno = 0;
printf("final: ");
for (int i = 0; i < bytesRead; i++) {
if (readBuffer[i] == 0) {
printf("\\0");
} else {
printf("%c", readBuffer[i]);
}
}
printf("\n");
return 0;
}
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