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feat: add -f/--sendfile for zero-copy file transfer

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- Add file_send_sendfile() using sendfile() syscall to send file
  content directly from fd to socket, bypassing userspace memory
- Add use_sendfile field to Config struct (default false)
- Add -f / --sendfile flag parsing in client.c
- sendfile path in send_chunk() used when -f is set without -c or -s
- send_files_multithreaded() falls back to single-threaded when
  sendfile is enabled (loader pipeline becomes unnecessary)
- Add Sendfile (-f) test case to test.py
This commit is contained in:
TapTap
2026-07-05 16:25:20 +02:00
parent e7c23c135b
commit 01045d7d14
7 changed files with 53 additions and 2 deletions
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src/client/client.c
+17 -2
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@@ -29,6 +29,11 @@ int send_chunk(Client *client, Chunk *chunk, Config *config) {
}
send_data(client->file_descriptor, data->data, data->size);
data_destroy(data);
} else if (config->use_sendfile && !config->use_compression) {
for (int i = 0; i < chunk->element_count; i++) {
send_status(client->file_descriptor, STATUS_NEXT);
file_send_sendfile(chunk->items[i], client->file_descriptor);
}
} else {
for (int i = 0; i < chunk->element_count; i++) {
send_status(client->file_descriptor, STATUS_NEXT);
@@ -130,8 +135,10 @@ int send_files(Config *config) {
DirectoryScanner *scanner = directory_scanner_create(config->send_directory);
Chunk *current_chunk;
while ((current_chunk = directory_scanner_next(scanner)) != NULL) {
for (int i = 0; i < current_chunk->element_count; i++)
file_load_data(current_chunk->items[i]);
if (!config->use_sendfile) {
for (int i = 0; i < current_chunk->element_count; i++)
file_load_data(current_chunk->items[i]);
}
send_chunk(client, current_chunk, config);
chunk_destroy(current_chunk);
}
@@ -145,6 +152,11 @@ int send_files(Config *config) {
}
int send_files_multithreaded(Config *config) {
if (config->use_sendfile) {
log_message(LOG_LEVEL_INFO, "Sendfile enabled, falling back to single-threaded");
return send_files(config);
}
PipelineContextSender *context =
pipeline_context_sender_create(config, queue_create(100, chunk_destroy),
queue_create(100, chunk_destroy));
@@ -215,6 +227,9 @@ int main(int argc, char *argv[]) {
config->receive_root_directory = str_dup(argv[++i]);
} else if (strcmp(argv[i], "--save-to-disk") == 0) {
config->save_to_disk = true;
} else if (strcmp(argv[i], "-f") == 0 || strcmp(argv[i], "--sendfile") == 0) {
config->use_sendfile = true;
log_message(LOG_LEVEL_INFO, "Enabled sendfile");
} else {
handle_arg(argv[i], "-m", &config->use_multithreading,
"Enabled Multithreading");