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/* Linuxthreads - a simple clone()-based implementation of Posix */
/* threads for Linux. */
/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */
/* */
/* This program is free software; you can redistribute it and/or */
/* modify it under the terms of the GNU Library General Public License */
/* as published by the Free Software Foundation; either version 2 */
/* of the License, or (at your option) any later version. */
/* */
/* This program is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU Library General Public License for more details. */
/* Signal handlers */
#include "internals.h"
/* The wrapper around user-provided signal handlers */
void __pthread_sighandler(int signo, SIGCONTEXT ctx)
{
pthread_descr self;
char * in_sighandler;
self = check_thread_self();
/* If we're in a sigwait operation, just record the signal received
and return without calling the user's handler */
if (THREAD_GETMEM(self, p_sigwaiting)) {
THREAD_SETMEM(self, p_sigwaiting, 0);
THREAD_SETMEM(self, p_signal, signo);
return;
}
/* Record that we're in a signal handler and call the user's
handler function */
in_sighandler = THREAD_GETMEM(self, p_in_sighandler);
if (in_sighandler == NULL)
THREAD_SETMEM(self, p_in_sighandler, CURRENT_STACK_FRAME);
CALL_SIGHANDLER(__sighandler[signo].old, signo, ctx);
if (in_sighandler == NULL)
THREAD_SETMEM(self, p_in_sighandler, NULL);
}
/* The same, this time for real-time signals. */
void __pthread_sighandler_rt(int signo, struct siginfo *si,
struct ucontext *uc)
{
pthread_descr self;
char * in_sighandler;
self = check_thread_self();
/* If we're in a sigwait operation, just record the signal received
and return without calling the user's handler */
if (THREAD_GETMEM(self, p_sigwaiting)) {
THREAD_SETMEM(self, p_sigwaiting, 0);
THREAD_SETMEM(self, p_signal, signo);
return;
}
/* Record that we're in a signal handler and call the user's
handler function */
in_sighandler = THREAD_GETMEM(self, p_in_sighandler);
if (in_sighandler == NULL)
THREAD_SETMEM(self, p_in_sighandler, CURRENT_STACK_FRAME);
__sighandler[signo].rt(signo, si, uc);
if (in_sighandler == NULL)
THREAD_SETMEM(self, p_in_sighandler, NULL);
}
/* A signal handler that does nothing */
void __pthread_null_sighandler(int sig) { }
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