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Revert previous ser-unix change. Locks up serial device.

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This commit is contained in:
Andrew Cagney 2000-07-01 08:02:53 +00:00
parent 45f9696ab6
commit 9e294fb82f
2 changed files with 47 additions and 28 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
Sat Jul 1 17:47:08 2000 Andrew Cagney <cagney@b1.cygnus.com>
* ser-unix.c (do_unix_readchar): Revert Tue Mar 28 18:19:50 2000
Andrew Cagney <cagney@b1.cygnus.com>. Locks up when no data is
pending.
Sat Jul 1 15:40:14 2000 Andrew Cagney <cagney@b1.cygnus.com>
* Makefile.in (SER_HARDWIRE): Restore code to set it by configure.

69
gdb/ser-unix.c
View File

@ -910,9 +910,9 @@ do_unix_readchar (serial_t scb, int timeout)
each time through the loop.
Also, timeout = 0 means to poll, so we just set the delta to 0, so we
will only go through the loop once. timeout < 0 means to wait forever. */
will only go through the loop once. */
delta = (timeout <= 0 ? 0 : 1);
delta = (timeout == 0 ? 0 : 1);
while (1)
{
@ -928,38 +928,51 @@ do_unix_readchar (serial_t scb, int timeout)
return SERIAL_TIMEOUT;
}
status = ser_unix_wait_for (scb, timeout < 0 ? timeout : delta);
status = ser_unix_wait_for (scb, delta);
timeout -= delta;
/* If we got an error back from wait_for, then we can return */
/* If we got a character or an error back from wait_for, then we can
break from the loop before the timeout is completed. */
if (status == SERIAL_ERROR)
return status;
status = read (scb->fd, scb->buf, BUFSIZ);
if (status <= 0)
{
if (status == 0)
{
if (timeout != 0)
continue;
else
return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
distinguish between EOF & timeouts
someday] */
}
else if (errno == EINTR)
continue;
else
return SERIAL_ERROR; /* Got an error from read */
if (status != SERIAL_TIMEOUT)
{
break;
}
scb->bufcnt = status;
scb->bufcnt--;
scb->bufp = scb->buf;
return *scb->bufp++;
/* If we have exhausted the original timeout, then generate
a SERIAL_TIMEOUT, and pass it out of the loop. */
else if (timeout == 0)
{
status = SERIAL_TIMEOUT;
break;
}
}
if (status < 0)
return status;
while (1)
{
status = read (scb->fd, scb->buf, BUFSIZ);
if (status != -1 || errno != EINTR)
break;
}
if (status <= 0)
{
if (status == 0)
return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
distinguish between EOF & timeouts
someday] */
else
return SERIAL_ERROR; /* Got an error from read */
}
scb->bufcnt = status;
scb->bufcnt--;
scb->bufp = scb->buf;
return *scb->bufp++;
}
/* Perform operations common to both old and new readchar. */