mirror of
https://github.com/reactos/reactos.git
synced 2024-10-30 11:35:58 +00:00
140 lines
2.6 KiB
C
140 lines
2.6 KiB
C
#include "config.h"
|
|
|
|
#include <stdio.h>
|
|
#include <signal.h>
|
|
|
|
#ifdef HAVE_STDLIB_H
|
|
# include <stdlib.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_UNISTD_H
|
|
# include <unistd.h>
|
|
#endif
|
|
|
|
#include <errno.h>
|
|
|
|
#include "slang.h"
|
|
#include "_slang.h"
|
|
|
|
/* This function will cause system calls to be restarted after signal if possible */
|
|
SLSig_Fun_Type *SLsignal (int sig, SLSig_Fun_Type *f)
|
|
{
|
|
#ifdef SLANG_POSIX_SIGNALS
|
|
struct sigaction old_sa, new_sa;
|
|
|
|
# ifdef SIGALRM
|
|
/* We want system calls to be interrupted by SIGALRM. */
|
|
if (sig == SIGALRM) return SLsignal_intr (sig, f);
|
|
# endif
|
|
|
|
sigemptyset (&new_sa.sa_mask);
|
|
new_sa.sa_handler = f;
|
|
|
|
new_sa.sa_flags = 0;
|
|
# ifdef SA_RESTART
|
|
new_sa.sa_flags |= SA_RESTART;
|
|
# endif
|
|
|
|
if (-1 == sigaction (sig, &new_sa, &old_sa))
|
|
return (SLSig_Fun_Type *) SIG_ERR;
|
|
|
|
return old_sa.sa_handler;
|
|
#else
|
|
/* Not POSIX. */
|
|
return signal (sig, f);
|
|
#endif
|
|
}
|
|
|
|
/* This function will NOT cause system calls to be restarted after
|
|
* signal if possible
|
|
*/
|
|
SLSig_Fun_Type *SLsignal_intr (int sig, SLSig_Fun_Type *f)
|
|
{
|
|
#ifdef SLANG_POSIX_SIGNALS
|
|
struct sigaction old_sa, new_sa;
|
|
|
|
sigemptyset (&new_sa.sa_mask);
|
|
new_sa.sa_handler = f;
|
|
|
|
new_sa.sa_flags = 0;
|
|
# ifdef SA_INTERRUPT
|
|
new_sa.sa_flags |= SA_INTERRUPT;
|
|
# endif
|
|
|
|
if (-1 == sigaction (sig, &new_sa, &old_sa))
|
|
return (SLSig_Fun_Type *) SIG_ERR;
|
|
|
|
return old_sa.sa_handler;
|
|
#else
|
|
/* Not POSIX. */
|
|
return signal (sig, f);
|
|
#endif
|
|
}
|
|
|
|
|
|
/* We are primarily interested in blocking signals that would cause the
|
|
* application to reset the tty. These include suspend signals and
|
|
* possibly interrupt signals.
|
|
*/
|
|
#ifdef SLANG_POSIX_SIGNALS
|
|
static sigset_t Old_Signal_Mask;
|
|
#endif
|
|
|
|
static volatile unsigned int Blocked_Depth;
|
|
|
|
int SLsig_block_signals (void)
|
|
{
|
|
#ifdef SLANG_POSIX_SIGNALS
|
|
sigset_t new_mask;
|
|
#endif
|
|
|
|
Blocked_Depth++;
|
|
if (Blocked_Depth != 1)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#ifdef SLANG_POSIX_SIGNALS
|
|
sigemptyset (&new_mask);
|
|
# ifdef SIGQUIT
|
|
sigaddset (&new_mask, SIGQUIT);
|
|
# endif
|
|
# ifdef SIGTSTP
|
|
sigaddset (&new_mask, SIGTSTP);
|
|
# endif
|
|
# ifdef SIGINT
|
|
sigaddset (&new_mask, SIGINT);
|
|
# endif
|
|
# ifdef SIGTTIN
|
|
sigaddset (&new_mask, SIGTTIN);
|
|
# endif
|
|
# ifdef SIGTTOU
|
|
sigaddset (&new_mask, SIGTTOU);
|
|
# endif
|
|
|
|
(void) sigprocmask (SIG_BLOCK, &new_mask, &Old_Signal_Mask);
|
|
return 0;
|
|
#else
|
|
/* Not implemented. */
|
|
return -1;
|
|
#endif
|
|
}
|
|
|
|
int SLsig_unblock_signals (void)
|
|
{
|
|
if (Blocked_Depth == 0)
|
|
return -1;
|
|
|
|
Blocked_Depth--;
|
|
|
|
if (Blocked_Depth != 0)
|
|
return 0;
|
|
|
|
#ifdef SLANG_POSIX_SIGNALS
|
|
(void) sigprocmask (SIG_SETMASK, &Old_Signal_Mask, NULL);
|
|
return 0;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
}
|