Some helpful test programs for testing file record locking.

src/xpdev/lockfile.c

+#include <stdlib.h>
+#include "filewrap.h"
+
+int main(int argc, char** argv)
+{
+	int access = O_RDWR;
+	const char* path = argv[1];
+
+	if(argc < 4) {
+		fprintf(stderr, "usage: lockfile path offset length\n");
+		return 0;
+	}
+
+	int file = open(path, access);
+	if(file < 0) {
+		puts("Open failure");
+		perror(path);
+		return -1;
+	}
+
+	int result = lock(file, atoi(argv[2]), atoi(argv[3]));
+	if(result != 0) {
+		puts("Lock failure");
+		perror(path);
+		return -1;
+	}
+	printf("Hit enter\n");
+	getchar();
+	close(file);
+	return 0;
+}
+

src/xpdev/showlocks.c

+#include "filewrap.h"
+
+void show_locks(const char* path)
+{
+	int file = open(path, O_RDWR);
+
+	if(file == -1) {
+		perror(path);
+		return;
+	}
+
+	off_t len = filelength(file);
+	for(off_t o = 0; o < len; ++o) {
+		if(lock(file, o, 1) != 0)
+			printf("Byte 0x%" PRIx64 " is locked\n", o);
+		else
+			unlock(file, o, 1);
+	}
+	close(file);
+}
+
+int main(int argc, char** argv)
+{
+	for(int i = 1; i < argc; ++i)
+		show_locks(argv[i]);
+	return 0;
+}