int
rmtopen(char *tape, int mode)
{
struct mtget mt;
char buf[256];
int fd;
(void) snprintf(buf, sizeof (buf), "O%s\n%d\n", tape, mode);
rmtstate = TS_OPEN;
fd = rmtcall(tape, buf);
if (fd != -1) {
/* see if the rmt server supports the extended protocol */
rmtversion = rmtioctl(-1, 0);
/*
* Some rmt daemons apparently close the connection
* when they get a bogus ioctl. See 1210852 (ignore
* the evaluation). Make sure we can still talk to
* the device, re-opening it if necessary.
*/
if (rmtversion < 1) {
if (rmtstatus(&mt) < 0) {
rmtclose();
rmtgetconn();
rmtversion = 0;
}
}
}
return (fd);
}
int
rmtread(char *buf, uint_t count)
{
char line[30];
int n, i, cc;
(void) snprintf(line, sizeof (line), "R%d\n", count);
n = rmtcall("read", line);
if (n < 0) {
return (-1);
}
if (n > count) {
print(dgettext(domainname,
"rmtread: expected response size %d, got %d\n"),
count, n);
print(dgettext(domainname,
"This means the remote rmt daemon is not compatible.\n"));
rmtconnaborted(0);
}
i = 0;
while (i < n) {
cc = read(rmtape, buf+i, n - i);
if (cc <= 0)
rmtconnaborted(0);
i += cc;
}
return (n);
}
int
rmtstatus(struct mtget *mt)
{
char *buf = (char *)mt;
int n, i, cc;
if (rmtversion > 0)
return (rmtstatus_extended(mt));
n = rmtcall("status", "S");
if (n < 0) {
return (-1);
}
if ((unsigned)n > sizeof (*mt)) {
print(dgettext(domainname,
"rmtstatus: expected response size %d, got %d\n"),
sizeof (struct mtget), n);
print(dgettext(domainname,
"This means the remote rmt daemon is not compatible.\n"));
rmtconnaborted(0);
}
i = 0;
while (i < n) {
cc = read(rmtape, buf+i, n - i);
if (cc <= 0)
rmtconnaborted(0);
i += cc;
}
return (n);
}
static int
rmtioctl_extended(int cmd, long count)
{
char buf[256];
(void) snprintf(buf, sizeof (buf), "i%d\n%ld\n", cmd, count);
return (rmtcall("ioctl", buf));
}
int
rmtseek(int offset, int pos)
{
char line[80];
(void) snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
return (rmtcall("seek", line));
}
rmtclose()
#endif
{
if (rmtstate != TS_OPEN)
return;
(void) rmtcall("close", "C\n");
rmtstate = TS_CLOSED;
}
void
rmtclose(void)
{
if (rmtstate != TS_OPEN)
return;
rmtcall("close", "C\n");
rmtstate = TS_CLOSED;
}
int
rmtopen(const char *tape, int mode)
{
char buf[256];
(void)snprintf(buf, sizeof (buf), "O%.226s\n%d\n", tape, mode);
rmtstate = TS_OPEN;
return (rmtcall(tape, buf));
}
int
rmtioctl(int cmd, int count)
{
char buf[256];
if (count < 0)
return (-1);
(void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
return (rmtcall("ioctl", buf));
}
static int
rmtstatus_extended(struct mtget *mt)
{
if ((mt->mt_type = rmtcall("status", "sT")) == -1)
return (-1);
mt->mt_dsreg = rmtcall("status", "sD");
mt->mt_erreg = rmtcall("status", "sE");
mt->mt_resid = rmtcall("status", "sR");
mt->mt_fileno = rmtcall("status", "sF");
mt->mt_blkno = rmtcall("status", "sB");
mt->mt_flags = rmtcall("status", "sf");
mt->mt_bf = rmtcall("status", "sb");
return (0);
}
struct mtget *
rmtstatus(void)
{
int i;
char *cp;
if (rmtstate != TS_OPEN)
return (NULL);
rmtcall("status", "S\n");
for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
*cp++ = rmtgetb();
return (&mts);
}
int
rmtioctl(int cmd, long count)
{
char buf[256];
int xcmd;
if (count < 0)
return (-1);
if ((xcmd = map_extended_ioctl(cmd)) != -1)
return (rmtioctl_extended(xcmd, count));
(void) snprintf(buf, sizeof (buf), "I%d\n%ld\n", cmd, count);
return (rmtcall("ioctl", buf));
}
int
rmtread(char *buf, int count)
{
char line[30];
int n, i, cc;
(void)snprintf(line, sizeof (line), "R%d\n", count);
n = rmtcall("read", line);
if (n < 0)
/* rmtcall() properly sets errno for us on errors. */
return (n);
for (i = 0; i < n; i += cc) {
cc = read(rmtape, buf+i, n - i);
if (cc <= 0)
rmtconnaborted(0);
}
return (n);
}
int
rmtread(char *buf, int count)
{
char line[30];
int n, i, cc;
(void)snprintf(line, sizeof(line), "R%d\n", count);
n = rmtcall("read", line);
if (n < 0) {
errno = n;
return (-1);
}
for (i = 0; i < n; i += cc) {
cc = read(rmtape, buf+i, n - i);
if (cc <= 0) {
rmtconnaborted(0);
}
}
return (n);
}
