added tsmread.c

diff --git a/tsmread.c b/tsmread.c
new file mode 100644 (file)
index 0000000..33037e9
--- /dev/null
+++ b/tsmread.c
@@ -0,0 +1,131 @@
+/*
+  example program to read a file in the same way that Samba does. This
+  demonstrates the problem with GPFS share modes and leases and TSM
+  migrated files
+
+  Andrew Tridgell January 2008
+
+  compile with:
+
+     gcc -Wall -o tsmread{,.c} -lgpfs_gpl
+
+  then to run you must symlink tsmread to smbd
+
+     ln -s tsmread smbd
+
+  and run like this:
+
+    ./smbd /gpfs/data/tsmtest/test.dat 
+    ./smbd /gpfs/data/tsmtest/test.dat -S
+    ./smbd /gpfs/data/tsmtest/test.dat -L
+    ./smbd /gpfs/data/tsmtest/test.dat -L -S
+
+ */
+
+#define _XOPEN_SOURCE 500
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <getopt.h>
+#include <signal.h>
+#include <stdbool.h>
+#include "gpfs_gpl.h"
+
+
+static void sigio_handler(int sig)
+{
+       printf("Got SIGIO\n");
+}
+
+static int read_file(const char *fname, bool use_lease, bool use_sharemode)
+{
+       int fd;
+       char c;
+
+       printf("Reading '%s' with use_lease=%s use_sharemode=%s\n",
+              fname, use_lease?"yes":"no", use_sharemode?"yes":"no");
+
+       signal(SIGIO, sigio_handler);
+
+       fd = open(fname, O_RDONLY);
+       if (fd == -1) {
+               perror(fname);
+               return -1;
+       }
+
+       if (use_lease && gpfs_set_lease(fd, GPFS_LEASE_READ) != 0) {
+               perror("gpfs_set_lease");
+               close(fd);
+               return -1;
+       }
+
+       if (use_sharemode && gpfs_set_share(fd, 1, 2) != 0) {
+               perror("gpfs_set_share");
+               close(fd);
+               return -1;
+       }
+
+       if (pread(fd, &c, 1, 0) != 1) {
+               perror("pread");
+               close(fd);
+               return -1;              
+       }
+
+       printf("read OK\n");
+       
+       close(fd);
+       return 0;       
+}
+
+static void usage(void)
+{
+       printf("Usage: (note, must run as 'smbd')\n");
+       printf("ln -sf tesmread smbd\n");
+       printf("./smbd [options] <files>\n");
+       printf("Options:\n");
+       printf("  -L    use gpfs leases\n");
+       printf("  -S    use gpfs sharemodes\n");
+       exit(0);
+}
+
+int main(int argc, char * const argv[])
+{
+       int opt, i;
+       bool use_lease = false, use_sharemode = false;
+       
+       /* parse command-line options */
+       while ((opt = getopt(argc, argv, "LSh")) != -1) {
+               switch (opt){
+               case 'L':
+                       use_lease = true;
+                       break;
+               case 'S':
+                       use_sharemode = true;
+                       break;
+               default:
+                       usage();
+                       break;
+               }
+       }
+
+       argv += optind;
+       argc -= optind;
+
+       if (argc == 0) {
+               usage();
+       }
+
+       for (i=0;i<argc;i++) {
+               const char *fname = argv[i];
+               if (read_file(fname, use_lease, use_sharemode) != 0) {
+                       printf("Failed to read '%s'\n", fname);
+               }
+       }
+
+       return 0;
+}