move engine to shared lib

hiisi/main.cpp

@@ -0,0 +1,102 @@
+#include "hiisi.h"
+
+#include <assert.h>
+#include <elf.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <dlfcn.h>
+#include <link.h>
+
+struct app_state {};
+
+Engine load_hiisi(const char *name) {
+    void *mod = dlopen(name, RTLD_NOW);
+
+    Lmid_t list;
+    dlinfo(mod, RTLD_DI_LMID, &list);
+    printf("link-map list id: %ld\n", list);
+
+    link_map *lmap = 0;
+    dlinfo(mod, RTLD_DI_LINKMAP, &lmap);
+
+    printf("Link map:\n");
+    printf("addr: %lu\n", lmap->l_addr);
+    printf("name: %s\n", lmap->l_name);
+    printf("dynamic section: %p\n", lmap->l_ld);
+
+    char pathname[256];
+    dlinfo(mod, RTLD_DI_ORIGIN, pathname);
+    printf("path: %s\n", pathname);
+
+    /* Discover the size of the buffer that we must pass to
+       RTLD_DI_SERINFO. */
+    Dl_serinfo serinfo;
+    Dl_serinfo *sip;
+
+    if (dlinfo(mod, RTLD_DI_SERINFOSIZE, &serinfo) == -1) {
+        fprintf(stderr, "RTLD_DI_SERINFOSIZE failed: %s\n", dlerror());
+        exit(EXIT_FAILURE);
+    }
+
+    /* Allocate the buffer for use with RTLD_DI_SERINFO. */
+
+    sip = (Dl_serinfo*)malloc(serinfo.dls_size);
+    if (sip == NULL) {
+        perror("malloc");
+        exit(EXIT_FAILURE);
+    }
+
+    /* Initialize the 'dls_size' and 'dls_cnt' fields in the newly
+       allocated buffer. */
+
+    if (dlinfo(mod, RTLD_DI_SERINFOSIZE, sip) == -1) {
+        fprintf(stderr, "RTLD_DI_SERINFOSIZE failed: %s\n", dlerror());
+        exit(EXIT_FAILURE);
+    }
+
+    /* Fetch and print library search list. */
+
+    if (dlinfo(mod, RTLD_DI_SERINFO, sip) == -1) {
+        fprintf(stderr, "RTLD_DI_SERINFO failed: %s\n", dlerror());
+        exit(EXIT_FAILURE);
+    }
+
+    for (size_t j = 0; j < serinfo.dls_cnt; j++)
+        printf("dls_serpath[%zu].dls_name = %s\n",
+               j, sip->dls_serpath[j].dls_name);
+
+    Engine engine;
+    engine.module = mod;
+    *(void **)&engine.init = dlsym(mod, "init");
+    *(void **)&engine.event = dlsym(mod, "event");
+    *(void **)&engine.iterate = dlsym(mod, "iterate");
+    *(void **)&engine.quit = dlsym(mod, "quit");
+
+    assert(engine.init);
+    assert(engine.event);
+    assert(engine.iterate);
+    assert(engine.quit);
+
+    return engine;
+}
+
+int main(int argc, char **argv) {
+
+    app_state state;
+    void *state_ptr = &state;
+
+    Engine hiisi = load_hiisi("build/hiisi/libhiisi-engine.so");
+    if (!hiisi.module) {
+        printf("%s\n", dlerror());
+        return 1;
+    }
+
+    hiisi.init(&state, argc, argv);
+    while (hiisi.event(&state)) {
+        hiisi.iterate(&state);
+    }
+
+    dlclose(hiisi.module);
+
+    return 0;
+}