mirror of
https://github.com/osnr/TabFS.git
synced 2024-05-19 14:06:34 +02:00
multi-threaded tabfs.c
This commit is contained in:
parent
f875d56b07
commit
3c8570ac52
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@ -632,7 +632,7 @@ async function onMessage(req) {
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// timeout is very useful because some operations just hang
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// (like trying to take a screenshot, until the tab is focused)
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didTimeout = true; console.error('timeout');
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port.postMessage({ op: req.op, error: unix.ETIMEDOUT });
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port.postMessage({ id: req.id, op: req.op, error: unix.ETIMEDOUT });
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}, 1000);
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/* console.time(req.op + ':' + req.path);*/
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@ -654,6 +654,7 @@ async function onMessage(req) {
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clearTimeout(timeout);
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console.log('resp', response);
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response.id = req.id;
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port.postMessage(response);
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}
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};
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12
fs/Makefile
12
fs/Makefile
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@ -7,25 +7,26 @@ OSXFUSE_ROOT = /usr/local
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# Root for libraries from FreeBSD's ports
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FREEBSD_ROOT = /usr/local
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CFLAGS_EXTRA = -DFUSE_USE_VERSION=26 -D_FILE_OFFSET_BITS=64 -Wall -Wno-unused-function -g
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CFLAGS ?= -O2
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CFLAGS_EXTRA = -DFUSE_USE_VERSION=26 -D_FILE_OFFSET_BITS=64 -Wall -Wextra -Wno-unused-result -g
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ifeq ($(shell uname -s),Linux)
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CFLAGS += $(CFLAGS_EXTRA)
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LIBS = -lfuse
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LIBS = -lfuse -pthread
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endif
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ifeq ($(shell uname -s),Darwin)
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CFLAGS = -I$(OSXFUSE_ROOT)/include/osxfuse/fuse -L$(OSXFUSE_ROOT)/lib -D_DARWIN_USE_64_BIT_INODE $(CFLAGS_EXTRA)
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CFLAGS += -I$(OSXFUSE_ROOT)/include/osxfuse/fuse -L$(OSXFUSE_ROOT)/lib -D_DARWIN_USE_64_BIT_INODE $(CFLAGS_EXTRA)
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LIBS = -losxfuse
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endif
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ifeq ($(shell uname -s),FreeBSD)
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CFLAGS += -L$(FREEBSD_ROOT)/lib -I$(FREEBSD_ROOT)/include $(CFLAGS_EXTRA)
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LIBS = -lfuse
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LIBS = -lfuse -pthread
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endif
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all: $(TARGETS)
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tabfs: tabfs.c
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cc $(CFLAGS) -o $@ $^ $(LIBS)
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$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
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clean:
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rm -f $(TARGETS) *.o
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@ -34,3 +35,4 @@ clean:
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unmount:
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killall -9 tabfs || true
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diskutil unmount force mnt || true
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fusermount -u mnt || true
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494
fs/tabfs.c
494
fs/tabfs.c
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@ -1,231 +1,477 @@
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// This file should rarely need to be changed. (which is intentional,
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// because it is a pain to program here, it's a pain to recompile and
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// reload it, and it's a pain to debug it.) Most of the real meat of
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// TabFS is on the extension side, not here.
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <pthread.h>
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#include <string.h>
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#include <errno.h>
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#include <stdint.h>
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#include <assert.h>
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#include <fuse.h>
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#include "vendor/frozen.h"
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#include "vendor/frozen.c"
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FILE* l;
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#define eprintln(fmt, ...) fprintf(stderr, fmt "\n", ##__VA_ARGS__)
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static void send_request(const char *fmt, ...) {
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va_list args; va_start(args, fmt);
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// protects:
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// - writing to stdout
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// - the "waiters" global
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static pthread_mutex_t write_lock = PTHREAD_MUTEX_INITIALIZER;
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char request_data[1024*1024]; // max size of native->Chrome message
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struct json_out out = JSON_OUT_BUF(request_data, sizeof(request_data));
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unsigned int request_len = json_vprintf(&out, fmt, args);
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struct resumedata {
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unsigned int id;
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int msgpipe[2];
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void *data;
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size_t size;
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};
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static struct resumedata **waiters;
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static size_t numwaiters;
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static void read_or_die(int fd, void *buf, size_t sz) {
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size_t sofar = 0;
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while (sofar < sz) {
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ssize_t rv = read(fd, (char *)buf+sofar, sz-sofar);
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if (rv == -1) {
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if (errno == EINTR || errno == EAGAIN) continue;
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perror("read error");
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exit(1);
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}
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if (rv == 0) exit(1);
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sofar += (size_t)rv;
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}
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}
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static void write_or_die(int fd, void *buf, size_t sz) {
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size_t sofar = 0;
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while (sofar < sz) {
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ssize_t rv = write(fd, (char *)buf+sofar, sz-sofar);
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if (rv == -1) {
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if (errno == EINTR || errno == EAGAIN) continue;
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perror("write error");
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exit(1);
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}
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if (rv == 0) exit(1);
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sofar += (size_t)rv;
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}
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}
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// documented somewhere in https://developer.chrome.com/docs/apps/nativeMessaging/
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#define MAX_MESSAGE_SIZE (1024*1024)
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static int do_exchange(unsigned int id,
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char **datap, size_t *sizep,
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const char *fmt, ...) {
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*datap = NULL;
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*sizep = 0;
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char jsonbuf[MAX_MESSAGE_SIZE];
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struct json_out out = JSON_OUT_BUF(jsonbuf, sizeof(jsonbuf));
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va_list args;
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va_start(args, fmt);
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size_t request_size = (size_t)json_vprintf(&out, fmt, args);
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va_end(args);
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write(1, (char *) &request_len, 4); // stdout
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unsigned int bytes_written = 0;
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while (bytes_written < request_len) {
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bytes_written += write(1, request_data, request_len);
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if (request_size > sizeof(jsonbuf)) {
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eprintln("warning: request too big to send (%zu > %zu)",
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request_size, sizeof(jsonbuf));
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return -EMSGSIZE;
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}
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/* fprintf(l, "req[%s]\n", request_data); fflush(l); */
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struct resumedata mydata = {
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.id = id,
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.msgpipe = {-1, -1},
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.data = NULL,
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.size = 0,
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};
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if (-1 == pipe(mydata.msgpipe)) {
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perror("exchange: pipe");
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return -EIO;
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}
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pthread_mutex_lock(&write_lock);
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uint32_t size_4bytes = request_size;
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write_or_die(STDOUT_FILENO, &size_4bytes, sizeof(size_4bytes));
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write_or_die(STDOUT_FILENO, jsonbuf, request_size);
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waiters = realloc(waiters, (numwaiters+1)*sizeof(*waiters));
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waiters[numwaiters] = &mydata;
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numwaiters += 1;
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pthread_mutex_unlock(&write_lock);
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char c;
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read_or_die(mydata.msgpipe[0], &c, 1);
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close(mydata.msgpipe[0]);
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close(mydata.msgpipe[1]);
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int err;
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if (1 == json_scanf(mydata.data, mydata.size, "{error: %d}", &err)) {
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free(mydata.data);
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return -err;
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}
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*datap = mydata.data;
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*sizep = mydata.size;
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return 0;
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}
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static int await_response(char **resp) {
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unsigned int response_len;
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read(0, (char *) &response_len, 4); // stdin
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char *response_data = malloc(response_len);
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unsigned int bytes_read = 0;
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while (bytes_read < response_len) {
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bytes_read += read(0, response_data + bytes_read, response_len);
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}
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/* fprintf(l, "resp(%d; expected %d)[%s]\n", bytes_read, response_len, response_data); fflush(l); */
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if (response_data == NULL) {
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// Connection is dead.
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*resp = "{ \"error\": 5 }";
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return strlen(*resp);
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}
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static void *reader_main(void *ud) {
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(void)ud;
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for (;;) {
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uint32_t size_4bytes;
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read_or_die(STDIN_FILENO, &size_4bytes, sizeof(size_4bytes));
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size_t insize = size_4bytes;
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*resp = response_data;
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return response_len;
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char *data = malloc(insize);
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read_or_die(STDIN_FILENO, data, insize);
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unsigned int id;
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if (1 != json_scanf(data, insize, "{id: %u}", &id)) {
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eprintln("reader: warning: got a message without an id, ignoring");
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free(data);
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continue;
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}
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pthread_mutex_lock(&write_lock);
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int found = 0;
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unsigned int i = numwaiters;
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while (i --> 0) {
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if (waiters[i]->id == id) {
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char c = '!';
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waiters[i]->data = data;
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waiters[i]->size = insize;
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write_or_die(waiters[i]->msgpipe[1], &c, 1);
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memmove(&waiters[i], &waiters[i+1],
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(numwaiters-(i+1))*sizeof(*waiters));
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numwaiters -= 1;
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found = 1;
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break;
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}
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}
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if (!found) {
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eprintln("reader: warning: got a message for nonexistent waiter %u", id);
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free(data);
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}
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pthread_mutex_unlock(&write_lock);
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}
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return NULL;
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}
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#define receive_response(fmt, ...) \
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do { \
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char *resp; int resp_len; \
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resp_len = await_response(&resp); \
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if (!resp_len) return -EIO; \
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\
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int err; \
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if (json_scanf(resp, resp_len, "{error: %d}", &err) && err) { \
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free(resp); return -err; \
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} \
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\
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json_scanf(resp, resp_len, fmt, __VA_ARGS__); \
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free(resp); \
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static int count_fmt_args(const char *s) {
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int cnt = 0;
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for (; *s; s++) {
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if (*s == '%') {
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if (*(s+1) != '%') cnt++;
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else s++;
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}
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}
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return cnt;
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}
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#define exchange_json(datap, sizep, keys_fmt, ...) \
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do { \
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unsigned int id = pthread_self(); \
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int req_rv = do_exchange(id, datap, sizep, \
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"{id: %u, " keys_fmt "}", \
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id, ##__VA_ARGS__); \
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if (req_rv != 0) return req_rv; \
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} while (0)
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#define parse_and_free_response(data, size, keys_fmt, ...) \
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do { \
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if (*keys_fmt == '\0') { \
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/* empty format string, skip the work */ \
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free(data); data = NULL; \
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} else { \
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int num_expected = count_fmt_args(keys_fmt); \
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int num_scanned = json_scanf(data, size, \
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"{" keys_fmt "}", \
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##__VA_ARGS__); \
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if (num_scanned == num_expected) { \
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free(data); data = NULL; \
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} else { \
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eprintln("%s: could only parse %d of %d keys!", \
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__func__, num_expected, num_scanned); \
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free(data); data = NULL; \
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return -EIO; \
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} \
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} \
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} while (0)
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static int tabfs_getattr(const char *path, struct stat *stbuf) {
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send_request("{op: %Q, path: %Q}", "getattr", path);
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char *rdata;
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size_t rsize;
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exchange_json(&rdata, &rsize,
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"op: %Q, path: %Q",
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"getattr", path);
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memset(stbuf, 0, sizeof(struct stat));
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receive_response("{st_mode: %d, st_nlink: %d, st_size: %d}",
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&stbuf->st_mode, &stbuf->st_nlink, &stbuf->st_size);
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parse_and_free_response(rdata, rsize,
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"st_mode: %d, st_nlink: %d, st_size: %d",
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&stbuf->st_mode, &stbuf->st_nlink, &stbuf->st_size);
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return 0;
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}
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static int tabfs_readlink(const char *path, char *buf, size_t size) {
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send_request("{op: %Q, path: %Q}", "readlink", path);
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char *rdata;
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size_t rsize;
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exchange_json(&rdata, &rsize,
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"op: %Q, path: %Q",
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"readlink", path);
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char *scan_buf; int scan_len;
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receive_response("{buf: %V}", &scan_buf, &scan_len);
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memcpy(buf, scan_buf, scan_len < size ? scan_len : size); free(scan_buf);
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char *scan_buf;
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int scan_len;
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parse_and_free_response(rdata, rsize,
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"buf: %V",
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&scan_buf, &scan_len);
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// fuse.h:
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// "If the linkname is too long to fit in the buffer, it should be truncated."
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if ((size_t)scan_len >= size) scan_len = size-1;
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memcpy(buf, scan_buf, scan_len);
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buf[scan_len] = '\0';
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free(scan_buf);
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return 0;
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}
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static int tabfs_open(const char *path, struct fuse_file_info *fi) {
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send_request("{op: %Q, path: %Q, flags: %d}", "open", path, fi->flags);
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char *data;
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size_t size;
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exchange_json(&data, &size,
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"op: %Q, path: %Q, flags: %d",
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"open", path, fi->flags);
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receive_response("{fh: %d}", &fi->fh);
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parse_and_free_response(data, size,
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"fh: %d",
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&fi->fh);
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return 0;
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}
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static int
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tabfs_read(const char *path, char *buf, size_t size, off_t offset,
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struct fuse_file_info *fi) {
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send_request("{op: %Q, path: %Q, size: %d, offset: %d, fh: %d, flags: %d}",
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"read", path, size, offset, fi->fh, fi->flags);
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static int tabfs_read(const char *path,
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char *buf,
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size_t size,
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off_t offset,
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struct fuse_file_info *fi) {
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char *rdata;
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size_t rsize;
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exchange_json(&rdata, &rsize,
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"op: %Q, path: %Q, size: %d, offset: %d, fh: %d, flags: %d",
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"read", path, size, offset, fi->fh, fi->flags);
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char *scan_buf; int scan_len;
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receive_response("{buf: %V}", &scan_buf, &scan_len);
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memcpy(buf, scan_buf, scan_len < size ? scan_len : size); free(scan_buf);
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parse_and_free_response(rdata, rsize,
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"buf: %V",
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&scan_buf, &scan_len);
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if ((size_t)scan_len > size) scan_len = size;
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memcpy(buf, scan_buf, scan_len);
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free(scan_buf);
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return scan_len;
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}
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static int
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tabfs_write(const char *path, const char *buf, size_t size, off_t offset,
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struct fuse_file_info *fi) {
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static int tabfs_write(const char *path,
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const char *data,
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size_t size,
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off_t offset,
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struct fuse_file_info *fi) {
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char *rdata;
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size_t rsize;
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exchange_json(&rdata, &rsize,
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"op: %Q, path: %Q, buf: %V, offset: %d, fh: %d, flags: %d",
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"write", path, data, size, offset, fi->fh, fi->flags);
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send_request("{op: %Q, path: %Q, buf: %V, offset: %d, fh: %d, flags: %d}",
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"write", path, buf, size, offset, fi->fh, fi->flags);
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int ret;
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parse_and_free_response(rdata, rsize,
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"size: %d",
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&ret);
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int ret; receive_response("{size: %d}", &ret); return ret;
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return ret;
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}
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static int tabfs_release(const char *path, struct fuse_file_info *fi) {
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send_request("{op: %Q, path: %Q, fh: %d}",
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"release", path, fi->fh);
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char *data;
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size_t size;
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exchange_json(&data, &size,
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"op: %Q, path: %Q, fh: %d",
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"release", path, fi->fh);
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parse_and_free_response(data, size, "");
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receive_response("{}", NULL);
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return 0;
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}
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static int tabfs_opendir(const char *path, struct fuse_file_info *fi) {
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send_request("{op: %Q, path: %Q, flags: %d}",
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"opendir", path, fi->flags);
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char *rdata;
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size_t rsize;
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exchange_json(&rdata, &rsize,
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"op: %Q, path: %Q, flags: %d",
|
||||
"opendir", path, fi->flags);
|
||||
|
||||
parse_and_free_response(rdata, rsize,
|
||||
"fh: %d",
|
||||
&fi->fh);
|
||||
|
||||
receive_response("{fh: %d}", &fi->fh);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
tabfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
|
||||
off_t offset, struct fuse_file_info *fi) {
|
||||
send_request("{op: %Q, path: %Q, offset: %d}",
|
||||
"readdir", path, offset);
|
||||
static int tabfs_readdir(const char *path,
|
||||
void *buf,
|
||||
fuse_fill_dir_t filler,
|
||||
off_t offset,
|
||||
struct fuse_file_info *fi) {
|
||||
(void)fi;
|
||||
|
||||
char *resp; int resp_len;
|
||||
resp_len = await_response(&resp);
|
||||
if (!resp_len) return -EIO;
|
||||
char *rdata;
|
||||
size_t rsize;
|
||||
exchange_json(&rdata, &rsize,
|
||||
"op: %Q, path: %Q, offset: %d",
|
||||
"readdir", path, offset);
|
||||
|
||||
struct json_token t;
|
||||
for (int i = 0; json_scanf_array_elem(resp, resp_len, ".entries", i, &t) > 0; i++) {
|
||||
char entry[t.len + 1]; snprintf(entry, t.len + 1, "%.*s", t.len, t.ptr);
|
||||
for (int i = 0; json_scanf_array_elem(rdata, rsize, ".entries", i, &t) > 0; i++) {
|
||||
char entry[t.len+1];
|
||||
memcpy(entry, t.ptr, t.len);
|
||||
entry[t.len] = '\0';
|
||||
filler(buf, entry, NULL, 0);
|
||||
}
|
||||
|
||||
free(resp);
|
||||
parse_and_free_response(rdata, rsize, "");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tabfs_releasedir(const char *path, struct fuse_file_info *fi) {
|
||||
send_request("{op: %Q, path: %Q, fh: %d}",
|
||||
"releasedir", path, fi->fh);
|
||||
char *rdata;
|
||||
size_t rsize;
|
||||
exchange_json(&rdata, &rsize,
|
||||
"op: %Q, path: %Q, fh: %d",
|
||||
"releasedir", path, fi->fh);
|
||||
|
||||
parse_and_free_response(rdata, rsize, "");
|
||||
|
||||
receive_response("{}", NULL);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tabfs_truncate(const char *path, off_t size) {
|
||||
send_request("{op: %Q, path: %Q, size: %d}",
|
||||
"truncate", path, size);
|
||||
char *rdata;
|
||||
size_t rsize;
|
||||
exchange_json(&rdata, &rsize,
|
||||
"op: %Q, path: %Q, size: %d",
|
||||
"truncate", path, size);
|
||||
|
||||
parse_and_free_response(rdata, rsize, "");
|
||||
|
||||
receive_response("{}", NULL);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tabfs_unlink(const char *path) {
|
||||
send_request("{op: %Q, path: %Q}", "unlink", path);
|
||||
char *rdata;
|
||||
size_t rsize;
|
||||
exchange_json(&rdata, &rsize,
|
||||
"op: %Q, path: %Q",
|
||||
"unlink", path);
|
||||
|
||||
parse_and_free_response(rdata, rsize, "");
|
||||
|
||||
receive_response("{}", NULL);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tabfs_mkdir(const char *path, mode_t mode) {
|
||||
send_request("{op: %Q, path: %Q, mode: %d}", "mkdir", path, mode);
|
||||
char *rdata;
|
||||
size_t rsize;
|
||||
exchange_json(&rdata, &rsize,
|
||||
"op: %Q, path: %Q, mode: %d",
|
||||
"mkdir", path, mode);
|
||||
|
||||
parse_and_free_response(rdata, rsize, "");
|
||||
|
||||
receive_response("{}", NULL);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tabfs_create(const char *path, mode_t mode, struct fuse_file_info *fi) {
|
||||
send_request("{op: %Q, path: %Q, mode: %d}", "mkdir", path, mode);
|
||||
(void)fi;
|
||||
|
||||
char *rdata;
|
||||
size_t rsize;
|
||||
exchange_json(&rdata, &rsize,
|
||||
"op: %Q, path: %Q, mode: %d",
|
||||
"mkdir", path, mode);
|
||||
|
||||
parse_and_free_response(rdata, rsize, "");
|
||||
|
||||
receive_response("{}", NULL);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct fuse_operations tabfs_filesystem_operations = {
|
||||
static const struct fuse_operations tabfs_oper = {
|
||||
.getattr = tabfs_getattr,
|
||||
.readlink = tabfs_readlink,
|
||||
|
||||
.open = tabfs_open,
|
||||
.read = tabfs_read,
|
||||
.write = tabfs_write,
|
||||
.release = tabfs_release,
|
||||
.open = tabfs_open,
|
||||
.read = tabfs_read,
|
||||
.write = tabfs_write,
|
||||
.release = tabfs_release,
|
||||
|
||||
.opendir = tabfs_opendir,
|
||||
.readdir = tabfs_readdir,
|
||||
.opendir = tabfs_opendir,
|
||||
.readdir = tabfs_readdir,
|
||||
.releasedir = tabfs_releasedir,
|
||||
|
||||
.truncate = tabfs_truncate,
|
||||
.unlink = tabfs_unlink,
|
||||
.truncate = tabfs_truncate,
|
||||
.unlink = tabfs_unlink,
|
||||
|
||||
.mkdir = tabfs_mkdir,
|
||||
.create = tabfs_create
|
||||
.mkdir = tabfs_mkdir,
|
||||
.create = tabfs_create,
|
||||
};
|
||||
|
||||
int main(int argc, char **argv) {
|
||||
char killcmd[1000];
|
||||
sprintf(killcmd, "pgrep tabfs | grep -v %d | xargs kill -9", getpid());
|
||||
(void)argc;
|
||||
|
||||
freopen("log.txt", "a", stderr);
|
||||
setvbuf(stderr, NULL, _IONBF, 0);
|
||||
|
||||
char killcmd[128];
|
||||
sprintf(killcmd, "pgrep tabfs | grep -v %d | xargs kill -9 2>/dev/null", getpid());
|
||||
system(killcmd);
|
||||
#ifdef __APPLE__
|
||||
system("diskutil umount force mnt > /dev/null");
|
||||
#elif __FreeBSD__
|
||||
system("umount -f mnt");
|
||||
|
||||
#if defined(__APPLE__)
|
||||
system("diskutil umount force mnt >/dev/null");
|
||||
#elif defined(__FreeBSD__)
|
||||
system("umount -f mnt 2>/dev/null");
|
||||
#else
|
||||
system("fusermount -u mnt");
|
||||
system("fusermount -u mnt 2>/dev/null");
|
||||
#endif
|
||||
|
||||
l = fopen("log.txt", "w");
|
||||
for (int i = 0; i < argc; i++) {
|
||||
fprintf(l, "arg%d: [%s]\n", i, argv[i]); fflush(l);
|
||||
mkdir("mnt", 0755);
|
||||
|
||||
pthread_t thread;
|
||||
int err = pthread_create(&thread, NULL, reader_main, NULL);
|
||||
if (err != 0) {
|
||||
eprintln("pthread_create: %s", strerror(err));
|
||||
exit(1);
|
||||
}
|
||||
char* fuse_argv[] = {argv[0], "-odirect_io", "-s", "-f", "mnt"};
|
||||
return fuse_main(5, fuse_argv, &tabfs_filesystem_operations, NULL);
|
||||
pthread_detach(thread);
|
||||
|
||||
char *fuse_argv[] = {
|
||||
argv[0],
|
||||
"-f",
|
||||
"-oauto_unmount",
|
||||
"-odirect_io",
|
||||
"mnt",
|
||||
NULL,
|
||||
};
|
||||
return fuse_main(
|
||||
(sizeof(fuse_argv)/sizeof(*fuse_argv))-1,
|
||||
(char **)&fuse_argv,
|
||||
&tabfs_oper,
|
||||
NULL);
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue