A useful little program for testing sopen() from filewrap.c

This is the program I used (along with flock) to reach the root cause of
the SH_COMPAT == SH_DENYRW (no locking) bug in sopen() as well as other
interactions between Linux and Windows clients opening the same files
across a Samba share.

src/xpdev/sopenfile.c

+#include "filewrap.h"
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char** argv)
+{
+	int access = O_RDWR;
+	char* share = "NWA";
+	bool try_all = true;
+
+	if(argc < 2) {
+		printf("usage: sopenfile [-r] <path/filename> [share-mode]\n");
+		printf("\n");
+		printf("-r           open file read-only instead of read/write\n");
+		printf("\n");
+		printf("share-mode:  N (deny-none)\n");
+		printf("             W (deny-write)\n");
+		printf("             A (deny-all)\n");
+		return EXIT_SUCCESS;
+	}
+	int argn = 1;
+	if(strcmp(argv[argn], "-r") == 0) {
+		access = O_RDONLY;
+		++argn;
+	}
+	const char* path = argv[argn++];
+	if(argc > argn) {
+		share = argv[argn++];
+		try_all = false;
+	}
+	
+	for(int i = 0; share[i] != '\0'; ++i) {
+		int share_mode = 0;
+		char share_flag = share[i];
+		switch(toupper(share_flag)) {
+			case 'N':
+				share_mode = SH_DENYNO;
+				break;
+			case 'W':
+				share_mode = SH_DENYWR;
+				break;
+			case 'A':
+				share_mode = SH_DENYRW;
+				break;
+			default:
+				fprintf(stderr, "Unrecognized share-mode: %c\n", share_flag);
+				return EXIT_FAILURE;
+		}
+		fprintf(stderr, "%s Deny-%c (share mode %x): ", path, toupper(share_flag), share_mode);
+		int file = sopen(path, access, share_mode);
+		if(file < 0)
+			fprintf(stderr, "Error %d (%s)\n", errno, strerror(errno));
+		else {
+			printf("Success\n");
+			if(!try_all) {
+				fprintf(stderr, "Hit enter\n");
+				getchar();
+			}
+			close(file);
+		}
+	}
+	return EXIT_SUCCESS;
+}
+