Fix open mode for IOCTLs which write to the tape.
diff --git a/mt.c b/mt.c
index 250856f..cd92627 100644
--- a/mt.c
+++ b/mt.c
@@ -55,7 +55,7 @@
const char *file = "/dev/tape";
const struct mt_opcodes *code = opcodes;
struct mtop op;
- int fd;
+ int fd, mode;
if (argc < 2) {
show_usage();
@@ -87,7 +87,20 @@
else
op.mt_count = 1; /* One, not zero, right? */
- if ((fd = open(file, O_RDONLY, 0)) < 0)
+ switch (code->value) {
+ case MTWEOF:
+ case MTERASE:
+ case MTWSM:
+ case MTSETDRVBUFFER:
+ mode = O_WRONLY;
+ break;
+
+ default:
+ mode = O_RDONLY;
+ break;
+ }
+
+ if ((fd = open(file, mode, 0)) < 0)
perror_msg_and_die("%s", file);
if (ioctl(fd, MTIOCTOP, &op) != 0)
