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