diff options
Diffstat (limited to 'linuxthreads/signals.c')
| -rw-r--r-- | linuxthreads/signals.c | 213 |
1 files changed, 0 insertions, 213 deletions
diff --git a/linuxthreads/signals.c b/linuxthreads/signals.c deleted file mode 100644 index 50f55995a3..0000000000 --- a/linuxthreads/signals.c +++ /dev/null @@ -1,213 +0,0 @@ -/* 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. */ - -/* Handling of signals */ - -#include <errno.h> -#include <signal.h> -#include "pthread.h" -#include "internals.h" -#include "spinlock.h" -#include <ucontext.h> - - -int pthread_sigmask(int how, const sigset_t * newmask, sigset_t * oldmask) -{ - sigset_t mask; - - if (newmask != NULL) { - mask = *newmask; - /* Don't allow __pthread_sig_restart to be unmasked. - Don't allow __pthread_sig_cancel to be masked. */ - switch(how) { - case SIG_SETMASK: - sigaddset(&mask, __pthread_sig_restart); - sigdelset(&mask, __pthread_sig_cancel); - if (__pthread_sig_debug > 0) - sigdelset(&mask, __pthread_sig_debug); - break; - case SIG_BLOCK: - sigdelset(&mask, __pthread_sig_cancel); - if (__pthread_sig_debug > 0) - sigdelset(&mask, __pthread_sig_debug); - break; - case SIG_UNBLOCK: - sigdelset(&mask, __pthread_sig_restart); - break; - } - newmask = &mask; - } - if (sigprocmask(how, newmask, oldmask) == -1) - return errno; - else - return 0; -} - -int pthread_kill(pthread_t thread, int signo) -{ - pthread_handle handle = thread_handle(thread); - int pid; - - __pthread_lock(&handle->h_lock, NULL); - if (invalid_handle(handle, thread)) { - __pthread_unlock(&handle->h_lock); - return ESRCH; - } - pid = handle->h_descr->p_pid; - __pthread_unlock(&handle->h_lock); - if (kill(pid, signo) == -1) - return errno; - else - return 0; -} - -union sighandler __sighandler[NSIG] = - { [1 ... NSIG - 1] = { (arch_sighandler_t) SIG_ERR } }; - -/* The wrapper around sigaction. Install our own signal handler - around the signal. */ -int __pthread_sigaction(int sig, const struct sigaction * act, - struct sigaction * oact) -{ - struct sigaction newact; - struct sigaction *newactp; - __sighandler_t old = SIG_DFL; - - if (sig == __pthread_sig_restart || - sig == __pthread_sig_cancel || - (sig == __pthread_sig_debug && __pthread_sig_debug > 0)) - { - __set_errno (EINVAL); - return -1; - } - if (sig > 0 && sig < NSIG) - old = (__sighandler_t) __sighandler[sig].old; - if (act) - { - newact = *act; - if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL - && sig > 0 && sig < NSIG) - { - if (act->sa_flags & SA_SIGINFO) - newact.sa_handler = (__sighandler_t) __pthread_sighandler_rt; - else - newact.sa_handler = (__sighandler_t) __pthread_sighandler; - if (old == SIG_IGN || old == SIG_DFL || old == SIG_ERR) - __sighandler[sig].old = (arch_sighandler_t) act->sa_handler; - } - newactp = &newact; - } - else - newactp = NULL; - if (__libc_sigaction(sig, newactp, oact) == -1) - { - if (act) - __sighandler[sig].old = (arch_sighandler_t) old; - return -1; - } - if (sig > 0 && sig < NSIG) - { - if (oact != NULL - /* We may have inherited SIG_IGN from the parent, so return the - kernel's idea of the signal handler the first time - through. */ - && old != SIG_ERR) - oact->sa_handler = old; - if (act) - /* For the assignment it does not matter whether it's a normal - or real-time signal. */ - __sighandler[sig].old = (arch_sighandler_t) act->sa_handler; - } - return 0; -} -#ifdef SHARED -strong_alias(__pthread_sigaction, __sigaction) -strong_alias(__pthread_sigaction, sigaction) -#endif - -/* sigwait -- synchronously wait for a signal */ -int __pthread_sigwait(const sigset_t * set, int * sig) -{ - volatile pthread_descr self = thread_self(); - sigset_t mask; - int s; - sigjmp_buf jmpbuf; - struct sigaction sa; - - /* Get ready to block all signals except those in set - and the cancellation signal. - Also check that handlers are installed on all signals in set, - and if not, install our dummy handler. This is conformant to - POSIX: "The effect of sigwait() on the signal actions for the - signals in set is unspecified." */ - sigfillset(&mask); - sigdelset(&mask, __pthread_sig_cancel); - for (s = 1; s < NSIG; s++) { - if (sigismember(set, s) && - s != __pthread_sig_restart && - s != __pthread_sig_cancel && - s != __pthread_sig_debug) { - sigdelset(&mask, s); - if (__sighandler[s].old == (arch_sighandler_t) SIG_ERR || - __sighandler[s].old == (arch_sighandler_t) SIG_DFL || - __sighandler[s].old == (arch_sighandler_t) SIG_IGN) { - sa.sa_handler = __pthread_null_sighandler; - sigfillset(&sa.sa_mask); - sa.sa_flags = 0; - sigaction(s, &sa, NULL); - } - } - } - /* Test for cancellation */ - if (sigsetjmp(jmpbuf, 1) == 0) { - THREAD_SETMEM(self, p_cancel_jmp, &jmpbuf); - if (! (THREAD_GETMEM(self, p_canceled) - && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE)) { - /* Reset the signal count */ - THREAD_SETMEM(self, p_signal, 0); - /* Say we're in sigwait */ - THREAD_SETMEM(self, p_sigwaiting, 1); - /* Unblock the signals and wait for them */ - sigsuspend(&mask); - } - } - THREAD_SETMEM(self, p_cancel_jmp, NULL); - /* The signals are now reblocked. Check for cancellation */ - pthread_testcancel(); - /* We should have self->p_signal != 0 and equal to the signal received */ - *sig = THREAD_GETMEM(self, p_signal); - return 0; -} -#ifdef SHARED -strong_alias (__pthread_sigwait, sigwait) -#endif - -/* Redefine raise() to send signal to calling thread only, - as per POSIX 1003.1c */ -int __pthread_raise (int sig) -{ - int retcode = pthread_kill(pthread_self(), sig); - if (retcode == 0) - return 0; - else { - errno = retcode; - return -1; - } -} -#ifdef SHARED -strong_alias (__pthread_raise, raise) -#endif - -/* This files handles cancellation internally. */ -LIBC_CANCEL_HANDLED (); |