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Implemented ioctl(FIONREAD) on tty devices. Untested.

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git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35960 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
François Revol 2010-03-26 19:47:23 +00:00
parent 8ce4644fbd
commit baaa0348a9
1 changed files with 21 additions and 0 deletions
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21
src/add-ons/kernel/drivers/tty/tty.cpp
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@ -17,6 +17,7 @@
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>
@ -1739,6 +1740,26 @@ tty_ioctl(tty_cookie* cookie, uint32 op, void* buffer, size_t length)
return B_OK;
}
case FIONREAD:
{
int toRead = 0;
// release the mutex and grab a read lock
locker.Unlock();
ReaderLocker readLocker(cookie);
status_t status = readLocker.AcquireReader(0, 1);
if (status >= B_OK)
toRead = readLocker.AvailableBytes();
else if(status != B_WOULD_BLOCK)
return status;
if (user_memcpy(buffer, &toRead, sizeof(int)) != B_OK)
return B_BAD_ADDRESS;
return B_OK;
}
case TCWAITEVENT: // BeOS (uint*)
// wait for event (timeout if !NULL)
case TCVTIME: // BeOS (bigtime_t*) set highrez VTIME