diff options
Diffstat (limited to 'hurd/catch-signal.c')
| -rw-r--r-- | hurd/catch-signal.c | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/hurd/catch-signal.c b/hurd/catch-signal.c deleted file mode 100644 index 1d606ecaf0..0000000000 --- a/hurd/catch-signal.c +++ /dev/null @@ -1,167 +0,0 @@ -/* Convenience function to catch expected signals during an operation. - Copyright (C) 1996-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#include <hurd/signal.h> -#include <hurd/sigpreempt.h> -#include <string.h> -#include <assert.h> - -error_t -hurd_catch_signal (sigset_t sigset, - unsigned long int first, unsigned long int last, - error_t (*operate) (struct hurd_signal_preemptor *), - sighandler_t handler) -{ - /* We need to restore the signal mask, because otherwise the - signal-handling code will have blocked the caught signal and for - instance calling hurd_catch_signal again would then dump core. */ - sigjmp_buf buf; - void throw (int signo, long int sigcode, struct sigcontext *scp) - { siglongjmp (buf, scp->sc_error ?: EGRATUITOUS); } - - struct hurd_signal_preemptor preemptor = - { - sigset, first, last, - NULL, handler == SIG_ERR ? (sighandler_t) &throw : handler, - }; - - struct hurd_sigstate *const ss = _hurd_self_sigstate (); - error_t error; - - if (handler != SIG_ERR) - /* Not our handler; don't bother saving state. */ - error = 0; - else - /* This returns again with nonzero value when we preempt a signal. */ - error = sigsetjmp (buf, 1); - - if (error == 0) - { - /* Install a signal preemptor for the thread. */ - __spin_lock (&ss->lock); - preemptor.next = ss->preemptors; - ss->preemptors = &preemptor; - __spin_unlock (&ss->lock); - - /* Try the operation that might crash. */ - (*operate) (&preemptor); - } - - /* Either FUNCTION completed happily and ERROR is still zero, or it hit - an expected signal and `throw' made setjmp return the signal error - code in ERROR. Now we can remove the preemptor and return. */ - - __spin_lock (&ss->lock); - assert (ss->preemptors == &preemptor); - ss->preemptors = preemptor.next; - __spin_unlock (&ss->lock); - - return error; -} - - -error_t -hurd_safe_memset (void *dest, int byte, size_t nbytes) -{ - error_t operate (struct hurd_signal_preemptor *preemptor) - { - memset (dest, byte, nbytes); - return 0; - } - return hurd_catch_signal (sigmask (SIGBUS) | sigmask (SIGSEGV), - (vm_address_t) dest, (vm_address_t) dest + nbytes, - &operate, SIG_ERR); -} - - -error_t -hurd_safe_copyout (void *dest, const void *src, size_t nbytes) -{ - error_t operate (struct hurd_signal_preemptor *preemptor) - { - memcpy (dest, src, nbytes); - return 0; - } - return hurd_catch_signal (sigmask (SIGBUS) | sigmask (SIGSEGV), - (vm_address_t) dest, (vm_address_t) dest + nbytes, - &operate, SIG_ERR); -} - -error_t -hurd_safe_copyin (void *dest, const void *src, size_t nbytes) -{ - error_t operate (struct hurd_signal_preemptor *preemptor) - { - memcpy (dest, src, nbytes); - return 0; - } - return hurd_catch_signal (sigmask (SIGBUS) | sigmask (SIGSEGV), - (vm_address_t) src, (vm_address_t) src + nbytes, - &operate, SIG_ERR); -} - -error_t -hurd_safe_memmove (void *dest, const void *src, size_t nbytes) -{ - jmp_buf buf; - void throw (int signo, long int sigcode, struct sigcontext *scp) - { longjmp (buf, scp->sc_error ?: EGRATUITOUS); } - - struct hurd_signal_preemptor src_preemptor = - { - sigmask (SIGBUS) | sigmask (SIGSEGV), - (vm_address_t) src, (vm_address_t) src + nbytes, - NULL, (sighandler_t) &throw, - }; - struct hurd_signal_preemptor dest_preemptor = - { - sigmask (SIGBUS) | sigmask (SIGSEGV), - (vm_address_t) dest, (vm_address_t) dest + nbytes, - NULL, (sighandler_t) &throw, - &src_preemptor - }; - - struct hurd_sigstate *const ss = _hurd_self_sigstate (); - error_t error; - - /* This returns again with nonzero value when we preempt a signal. */ - error = setjmp (buf); - - if (error == 0) - { - /* Install a signal preemptor for the thread. */ - __spin_lock (&ss->lock); - src_preemptor.next = ss->preemptors; - ss->preemptors = &dest_preemptor; - __spin_unlock (&ss->lock); - - /* Do the copy; it might fault. */ - memmove (dest, src, nbytes); - } - - /* Either memmove completed happily and ERROR is still zero, or it hit - an expected signal and `throw' made setjmp return the signal error - code in ERROR. Now we can remove the preemptor and return. */ - - __spin_lock (&ss->lock); - assert (ss->preemptors == &dest_preemptor); - ss->preemptors = src_preemptor.next; - __spin_unlock (&ss->lock); - - return error; -} |