Define _FILE_OFFSET_BITS=64

[tfcrypt.git] / tfc_error.c

diff --git a/tfc_error.c b/tfc_error.c
index 7c001dacf0c52859b974e38e288733ff06e2cc06..e33131504fa1051b22b1f419202fd137b0d23a97 100644 (file)
--- a/tfc_error.c
+++ b/tfc_error.c
@@ -151,6 +151,8 @@ void usage(void)
        tfc_say("convert encrypted data into ASCII format to ease transmission.");
        tfc_say("\n");
        tfc_say("  -e, -d: encrypt, decrypt (it maybe required).");
+       tfc_say("  -s <file>: load tfcrypt salt from file.");
+       tfc_say("  -s disable: disable key salting at all.");
        tfc_say("  -p: instead of using key, ask for password.");
        tfc_say("  -k: use raw (%u byte) key instead of deriving it from arbitrary data.", TFC_U(TF_KEY_SIZE));
        tfc_say("  -z: ask for key in plain C string form through password asker.");
@@ -210,9 +212,13 @@ void usage(void)
        tfc_say("    cont: print error if not quiet, then continue,");
        tfc_say("      no action to pad missing data is attempted.");
        tfc_say("      may be dangerous when working with block devices.");
-       tfc_say("    sync: print error if not quiet, then continue.");
+       tfc_say("    sync: print error if not quiet, then continue,");
        tfc_say("      pad missing data block with zeroes.");
-       tfc_say("      note that sync works only with read errors!");
+       tfc_say("    lsync: same as sync, but does not use SEEK_SET logic,");
+       tfc_say("      lsync uses only relative seek operations, and does not prequery");
+       tfc_say("      the current file position for exact offsets, which maybe unsafe.");
+       tfc_say("      For this reason, it is HIGHLY recommended to use sync instead!");
+       tfc_say("      Note that both sync and lsync work only with read errors!");
        tfc_say("  default error action is exit with printing status if not quiet.");
        tfc_say("  -E xall: turn on error actions above for all errors, not just EIO errors.");
        tfc_say("    This must be a separate option given before usual -E how option.");