6
#include <emscripten.h>
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var device = FS.makedev(major++, 0);
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FS.registerDevice(device, {
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open: function(stream) {
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stream.payload = [65, 66, 67, 68];
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read: function(stream, buffer, offset, length, pos) {
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for (var i = 0; i < length; i++) {
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if (stream.payload.length) {
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buffer[offset+i] = stream.payload.shift();
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write: function(stream, buffer, offset, length, pos) {
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for (var i = 0; i < length; i++) {
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Module.print('TO DEVICE: ' + buffer[offset+i]);
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FS.mkdev('/device', device);
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var broken_device = FS.makedev(major++, 0);
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FS.registerDevice(broken_device, {
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read: function(stream, buffer, offset, length, pos) {
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throw new FS.ErrnoError(ERRNO_CODES.EIO);
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write: function(stream, buffer, offset, length, pos) {
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throw new FS.ErrnoError(ERRNO_CODES.EIO);
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FS.mkdev('/broken-device', broken_device);
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// NB: These are meant to test FS.createDevice specifically,
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// and as such do not use registerDevice/mkdev
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FS.createDevice('/', 'createDevice-read-only', function() {});
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FS.createDevice('/', 'createDevice-write-only', null, function() {});
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FS.mkdir('/folder', 0777);
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FS.writeFile('/file', '1234567890');
8
58
char readBuffer[256] = {0};
9
59
char writeBuffer[] = "writeme";
34
84
printf("errno: %d\n\n", errno);
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int cd_ro_r = open("/createDevice-read-only", O_RDONLY);
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printf("open read-only device from createDevice for read, errno: %d\n", errno);
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int cd_ro_w = open("/createDevice-read-only", O_WRONLY);
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printf("open read-only device from createDevice for write, errno: %d\n", errno);
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int cd_wo_r = open("/createDevice-write-only", O_RDONLY);
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printf("open write-only device from createDevice for read, errno: %d\n", errno);
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int cd_wo_w = open("/createDevice-write-only", O_WRONLY);
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printf("open write-only device from createDevice for write, errno: %d\n\n", errno);
37
100
int f = open("/file", O_RDWR);
38
101
printf("read from file: %d\n", read(f, readBuffer, sizeof readBuffer));
39
102
printf("data: %s\n", readBuffer);