X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=tfc_error.c;h=e1793fe0b5ed6e540886334bcb3a3e3272a10ff2;hb=a7a8ae5408eed270854e69adf40ccaf3a401f830;hp=048c0bb480a17e618f0161cf88426e090d234150;hpb=add1a38544028f7f763b0ccf9ac354e8b45bec23;p=tfcrypt.git

diff --git a/tfc_error.c b/tfc_error.c
index 048c0bb..e1793fe 100644
--- a/tfc_error.c
+++ b/tfc_error.c
@@ -212,9 +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.");
@@ -248,6 +252,7 @@ void usage(void)
 	tfc_say("    oseek=val: seek destination file/device by these val bytes.");
 	tfc_say("    count=val: process only these val bytes, both input and output.");
 	tfc_say("    xkey=val: take only val bytes from user keyfile.");
+	tfc_say("    okey=val: seek the key before reading it (usually a device).");
 	tfc_say("    xctr=val: specify size in bytes of initial counter prepended or read.");
 	tfc_say("  -P: plain IO mode: disable encryption/decryption code at all.");
 	tfc_say("\n");