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#include <stdio.h>
#include <stdlib.h>
#include <err.h>
#include <errno.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <sys/un.h>
#include <sys/socket.h>
#include "llm.h"
#define SOCK_PATH "/var/run/lexd/sock"
#define MODEL_PATH "qwen2.5-3b-instruct-q4_k_m.gguf"
static void usage(const char *prog)
{
errx(1, "usage: %s [-m model_path]", prog);
}
static void loop(struct llm_ctx *llm, int lsock)
{
int csock, c;
FILE *cfp;
size_t len;
char line[4096];
for (;;) {
csock = accept(lsock, NULL, NULL);
if (csock == -1) {
if (errno != EINTR)
syslog(LOG_WARNING, "accept() failed: %m");
continue;
}
if (!(cfp = fdopen(csock, "r+"))) {
syslog(LOG_WARNING, "fdopen() failed for cfp: %m");
close(csock);
continue;
}
if (fgets(line, sizeof(line), cfp) != NULL) {
len = strcspn(line, "\n");
if (line[len] == '\0' && len == sizeof(line) - 1) {
syslog(LOG_WARNING, "request too large");
// drain and skip
while ((c = fgetc(cfp)) != '\n' && c != EOF)
;
fclose(cfp);
continue;
}
line[len] = '\0';
if (line[0] != '\0')
llm_run(llm, line, cfp);
}
fclose(cfp);
}
}
int sock_init(void)
{
int sock;
struct sockaddr_un addr;
sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock == -1) {
syslog(LOG_ERR, "socket error: %m");
exit(1);
}
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strlcpy(addr.sun_path, SOCK_PATH, sizeof(addr.sun_path));
unlink(SOCK_PATH); /* remove stale socket from a previous run */
if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
syslog(LOG_ERR, "bind failed: %m");
exit(1);
}
if (listen(sock, 1) == -1) { /* backlog = 1 */
syslog(LOG_ERR, "listen(): %m");
exit(1);
}
return sock;
}
int main(int argc , char *argv[])
{
int sock, opt;
const char *prog;
const char *model_path;
struct llm_ctx *llm;
prog = argv[0];
model_path = MODEL_PATH;
openlog("lexd", LOG_PID | LOG_NDELAY, LOG_DAEMON);
while ((opt = getopt(argc, argv, "m:")) != -1) {
switch (opt) {
case 'm':
model_path = optarg;
break;
default:
usage(prog);
}
}
argc -= optind;
argv += optind;
if (argc != 0)
usage(prog);
if (unveil(model_path, "r") == -1) {
syslog(LOG_ERR, "unveil %s: %m", model_path);
exit(1);
}
if (unveil(SOCK_PATH, "rwc") == -1) {
syslog(LOG_ERR, "unveil %s: %m", SOCK_PATH);
exit(1);
}
if (unveil(NULL, NULL) == -1) {
syslog(LOG_ERR, "unveil lock failed: %m");
exit(1);
}
sock = sock_init();
if (!(llm = llm_init(model_path))) {
syslog(LOG_ERR, "failed to load model");
exit(1);
}
/* llm_init() calls mlock, hence pledge() after that. */
if (pledge("stdio unix", NULL) == -1) {
syslog(LOG_ERR, "secondary pledge: %m");
exit(1);
}
loop(llm, sock); /* doesn't return */
return 0;
}
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