git ssb

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#define _DEFAULT_SOURCE
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#include <dlfcn.h>
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#include <err.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "tune.h"
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struct tune_dl {
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	void *handle;
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	ino_t inode;
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	struct tune *tune;
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};
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static int tune_dl_load(struct tune_dl *dl, const char *libfname)
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{
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    struct stat st;
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	if (stat(libfname, &st) < 0) {
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		warn("stat");
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		return -1;
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	}
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    if (dl->inode == st.st_ino) {
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		// file unchanged
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		return 0;
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	}
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	// reload the library
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	if (dl->handle) {
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		dlclose(dl->handle);
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		dl->inode = 0;
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	}
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	dl->handle = dlopen(libfname, RTLD_NOW);
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	if (dl->handle == NULL) {
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		// warnx("dlopen: %s", dlerror());
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		return 0;
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	}
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	dl->tune = dlsym(dl->handle, "TUNE");
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	if (dl->tune == NULL) {
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		warn("dlsym");
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		dlclose(dl->handle);
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		return 0;
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	}
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	dl->inode = st.st_ino;
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	if (dl->tune->reload) {
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		dl->tune->reload(dl->tune);
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	}
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	return 0;
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}
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int main(int argc, char *argv[])
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{
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	struct tune_dl dl = {0};
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	const char *fname = "./tune.so";
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	if (tune_dl_load(&dl, fname) < 0) {
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		return 1;
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	}
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	if (dl.tune->init) {
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		dl.tune->init(dl.tune);
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	}
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	int t = 0;
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	while (1) {
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		(void) tune_dl_load(&dl, fname);
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		if (dl.handle && dl.tune->play) {
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			double sample = dl.tune->play(dl.tune, t);
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			printf("%d %f\n", t, sample);
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		}
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		(void) tune_dl_load(&dl, fname);
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        usleep(100000);
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		t++;
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	}
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	if (dl.tune->deinit) {
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		dl.tune->deinit(dl.tune);
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	}
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}
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