190 lines
2.7 KiB
C
190 lines
2.7 KiB
C
#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <sys/types.h>
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#include <signal.h>
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#include "ntp_syslog.h"
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#include "ntp_stdlib.h"
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static ctrl_c_fn ctrl_c_hook;
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#ifndef SYS_WINNT
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RETSIGTYPE sigint_handler(int);
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#else
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BOOL WINAPI console_event_handler(DWORD);
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#endif
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#ifdef HAVE_SIGACTION
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# ifdef SA_RESTART
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# define Z_SA_RESTART SA_RESTART
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# else
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# define Z_SA_RESTART 0
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# endif
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void
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signal_no_reset(
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int sig,
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void (*func)(int)
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)
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{
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int n;
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struct sigaction vec;
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struct sigaction ovec;
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ZERO(vec);
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sigemptyset(&vec.sa_mask);
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vec.sa_handler = func;
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/* Added for PPS clocks on Solaris 7 which get EINTR errors */
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# ifdef SIGPOLL
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if (SIGPOLL == sig)
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vec.sa_flags = Z_SA_RESTART;
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# endif
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# ifdef SIGIO
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if (SIGIO == sig)
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vec.sa_flags = Z_SA_RESTART;
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# endif
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do
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n = sigaction(sig, &vec, &ovec);
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while (-1 == n && EINTR == errno);
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if (-1 == n) {
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perror("sigaction");
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exit(1);
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}
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}
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#elif HAVE_SIGVEC
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void
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signal_no_reset(
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int sig,
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RETSIGTYPE (*func)(int)
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)
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{
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struct sigvec sv;
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int n;
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ZERO(sv);
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sv.sv_handler = func;
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n = sigvec(sig, &sv, (struct sigvec *)NULL);
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if (-1 == n) {
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perror("sigvec");
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exit(1);
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}
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}
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#elif HAVE_SIGSET
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void
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signal_no_reset(
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int sig,
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RETSIGTYPE (*func)(int)
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)
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{
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int n;
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n = sigset(sig, func);
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if (-1 == n) {
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perror("sigset");
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exit(1);
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}
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}
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#else
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/* Beware! This implementation resets the signal to SIG_DFL */
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void
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signal_no_reset(
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int sig,
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RETSIGTYPE (*func)(int)
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)
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{
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#ifndef SIG_ERR
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# define SIG_ERR (-1)
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#endif
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if (SIG_ERR == signal(sig, func)) {
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perror("signal");
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exit(1);
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}
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}
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#endif
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#ifndef SYS_WINNT
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/*
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* POSIX implementation of set_ctrl_c_hook()
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*/
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RETSIGTYPE
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sigint_handler(
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int signum
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)
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{
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UNUSED_ARG(signum);
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if (ctrl_c_hook != NULL)
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(*ctrl_c_hook)();
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}
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void
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set_ctrl_c_hook(
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ctrl_c_fn c_hook
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)
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{
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RETSIGTYPE (*handler)(int);
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if (NULL == c_hook) {
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handler = SIG_DFL;
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signal_no_reset(SIGINT, handler);
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ctrl_c_hook = c_hook;
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} else {
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ctrl_c_hook = c_hook;
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handler = &sigint_handler;
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signal_no_reset(SIGINT, handler);
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}
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}
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#else /* SYS_WINNT follows */
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/*
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* Windows implementation of set_ctrl_c_hook()
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*/
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BOOL WINAPI
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console_event_handler(
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DWORD dwCtrlType
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)
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{
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BOOL handled;
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if (CTRL_C_EVENT == dwCtrlType && ctrl_c_hook != NULL) {
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(*ctrl_c_hook)();
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handled = TRUE;
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} else {
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handled = FALSE;
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}
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return handled;
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}
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void
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set_ctrl_c_hook(
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ctrl_c_fn c_hook
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)
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{
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BOOL install;
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if (NULL == c_hook) {
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ctrl_c_hook = NULL;
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install = FALSE;
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} else {
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ctrl_c_hook = c_hook;
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install = TRUE;
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}
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if (!SetConsoleCtrlHandler(&console_event_handler, install))
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msyslog(LOG_ERR, "Can't %s console control handler: %m",
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(install)
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? "add"
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: "remove");
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}
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#endif /* SYS_WINNT */
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