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Add VMIN support.

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This commit is contained in:
Jonas 'Sortie' Termansen 2016-11-03 08:36:46 +01:00
parent c3652da29f
commit 8951adc5f0
1 changed files with 41 additions and 7 deletions
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48
kernel/logterminal.cpp
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@ -624,14 +624,48 @@ ssize_t LogTerminal::read(ioctx_t* ctx, uint8_t* userbuf, size_t count)
{
while ( !(linebuffer.CanPop() || numeofs) )
{
if ( sofar )
return sofar;
if ( nonblocking )
return errno = EWOULDBLOCK, -1;
if ( !kthread_cond_wait_signal(&datacond, &termlock) )
return errno = EINTR, -1;
if ( tio.c_lflag & ICANON )
{
if ( sofar )
return sofar;
if ( nonblocking )
return errno = EWOULDBLOCK, -1;
if ( !kthread_cond_wait_signal(&datacond, &termlock) )
return sofar ? sofar : (errno = EINTR, -1);
}
else
{
// TODO: Study POSIX 11.1.7 Non-Canonical Mode Input Processing.
if ( tio.c_cc[VMIN] <= sofar )
return sofar;
if ( 0 < tio.c_cc[VMIN] )
{
if ( nonblocking )
return errno = EWOULDBLOCK, -1;
if ( 0 < sofar && 0 < tio.c_cc[VTIME] )
{
// TODO: Only wait up until tio.c_cc[VTIME] * 0.1
// seconds between bytes.
}
if ( !kthread_cond_wait_signal(&datacond, &termlock) )
return sofar ? sofar : (errno = EINTR, -1);
}
else if ( tio.c_cc[VMIN] == 0 && 0 < tio.c_cc[VTIME] )
{
if ( sofar || true /* tio.c_cc[VTIME] * 0.1 seconds passed
since start of read function */ )
return sofar;
if ( nonblocking )
return errno = EWOULDBLOCK, -1;
// TODO: Only wait up until tio.c_cc[VTIME] * 0.1 seconds.
if ( !kthread_cond_wait_signal(&datacond, &termlock) )
return sofar ? sofar : (errno = EINTR, -1);
}
else
return sofar;
}
if ( !RequireForeground(SIGTTIN) )
return errno = EINTR, -1;
return sofar ? sofar : -1;
}
if ( numeofs )
{