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/* -----------------------------------------------------------------------------
*
* (c) The GHC Team, 1998-2009
*
* TTY-related functionality
*
* ---------------------------------------------------------------------------*/
#include "PosixSource.h"
#include "Rts.h"
#include "RtsUtils.h" // __hscore_get/set prototypes
#include "TTY.h"
#if defined(HAVE_TERMIOS_H)
#include <termios.h>
#endif
#if defined(HAVE_SIGNAL_H)
#include <signal.h>
#endif
// Here we save the terminal settings on the standard file
// descriptors, if we need to change them (eg. to support NoBuffering
// input).
static void *saved_termios[3] = {NULL,NULL,NULL};
void*
__hscore_get_saved_termios(int fd)
{
return (0 <= fd &&
fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) ?
saved_termios[fd] : NULL;
}
void
__hscore_set_saved_termios(int fd, void* ts)
{
if (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) {
saved_termios[fd] = ts;
}
}
void
resetTerminalSettings (void)
{
#if HAVE_TERMIOS_H
// Reset the terminal settings on the standard file descriptors,
// if we changed them. See System.Posix.Internals.tcSetAttr for
// more details, including the reason we termporarily disable
// SIGTTOU here.
{
int fd;
sigset_t sigset, old_sigset;
sigemptyset(&sigset);
sigaddset(&sigset, SIGTTOU);
sigprocmask(SIG_BLOCK, &sigset, &old_sigset);
for (fd = 0; fd <= 2; fd++) {
struct termios* ts =
(struct termios*)__hscore_get_saved_termios(fd);
if (ts != NULL) {
tcsetattr(fd,TCSANOW,ts);
}
}
sigprocmask(SIG_SETMASK, &old_sigset, NULL);
}
#endif
}
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