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* Send SIGTTIN/SIGTTOU when a background process tries to read 

from/write to a tty.
* Send SIGTSTP when the suspend character is typed.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22064 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2007-08-26 16:10:21 +00:00
parent 8eca44fa7e
commit b637ab846f
1 changed files with 52 additions and 3 deletions
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55
src/add-ons/kernel/drivers/tty/tty.cpp
View File

@ -12,6 +12,7 @@
#include <ctype.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include <util/AutoLock.h>
#include <util/kernel_cpp.h>
@ -114,6 +115,7 @@ class WriterLocker : public AbstractLocker {
private:
size_t _CheckAvailableBytes() const;
status_t _CheckBackgroundWrite() const;
struct tty *fSource;
struct tty *fTarget;
@ -130,6 +132,8 @@ class ReaderLocker : public AbstractLocker {
status_t AcquireReader(bool dontBlock);
private:
status_t _CheckBackgroundRead() const;
struct tty *fTTY;
RequestOwner fRequestOwner;
};
@ -581,6 +585,9 @@ WriterLocker::AcquireWriter(bool dontBlock, size_t bytesNeeded)
status = fRequestOwner.Error();
}
if (status == B_OK)
status = _CheckBackgroundWrite();
if (status == B_OK) {
if (fTarget->open_count > 0)
fBytes = _CheckAvailableBytes();
@ -592,6 +599,25 @@ WriterLocker::AcquireWriter(bool dontBlock, size_t bytesNeeded)
}
status_t
WriterLocker::_CheckBackgroundWrite() const
{
// only relevant for the slave end and only when TOSTOP is set
if (fSource->is_master
|| (fSource->settings->termios.c_lflag & TOSTOP) == 0) {
return B_OK;
}
pid_t processGroup = getpgid(0);
if (processGroup != fSource->settings->pgrp_id) {
send_signal(-processGroup, SIGTTOU);
return EIO;
}
return B_OK;
}
// #pragma mark -
@ -632,6 +658,10 @@ ReaderLocker::AcquireReader(bool dontBlock)
if (fCookie->closed)
return B_FILE_ERROR;
status_t status = _CheckBackgroundRead();
if (status != B_OK)
return status;
// check, if we're first in queue, and if there is something to read
if (fRequestOwner.IsFirstInQueues()) {
fBytes = line_buffer_readable(fTTY->input_buffer);
@ -646,9 +676,12 @@ ReaderLocker::AcquireReader(bool dontBlock)
// block until something happens
Unlock();
status_t status = fRequestOwner.Wait(true);
status = fRequestOwner.Wait(true);
Lock();
if (status == B_OK)
status = _CheckBackgroundRead();
if (status == B_OK)
fBytes = line_buffer_readable(fTTY->input_buffer);
@ -656,6 +689,23 @@ ReaderLocker::AcquireReader(bool dontBlock)
}
status_t
ReaderLocker::_CheckBackgroundRead() const
{
// only relevant for the slave end
if (fTTY->is_master)
return B_OK;
pid_t processGroup = getpgid(0);
if (processGroup != fTTY->settings->pgrp_id) {
send_signal(-processGroup, SIGTTIN);
return EIO;
}
return B_OK;
}
// #pragma mark -
@ -752,8 +802,7 @@ tty_input_putc_locked(struct tty *tty, int c)
else if (c == tty->settings->termios.c_cc[VQUIT])
signal = SIGQUIT;
else if (c == tty->settings->termios.c_cc[VSUSP])
// ToDo: what to do here?
signal = -1;
signal = SIGTSTP;
// do we need to deliver a signal?
if (signal != -1) {