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Mon Mar 4 17:35:09 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu>
* hurd/catch-signal.c (hurd_safe_memmove): New function. (hurd_safe_copyin, hurd_safe_copyout): New functions. * hurd/hurd/sigpreempt.h: Declare them.
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Roland McGrath
parent
661fa17673
commit
c3d3967cd2
@ -85,3 +85,82 @@ hurd_safe_memset (void *dest, int byte, size_t nbytes)
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(vm_address_t) dest, (vm_address_t) dest + nbytes,
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&operate, SIG_ERR);
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}
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error_t
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hurd_safe_copyout (void *dest, const void *src, size_t nbytes)
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{
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error_t operate (struct hurd_signal_preempter *preempter)
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{
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memcpy (dest, src, nbytes);
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return 0;
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}
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return hurd_catch_signal (sigmask (SIGBUS) | sigmask (SIGSEGV),
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(vm_address_t) dest, (vm_address_t) dest + nbytes,
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&operate, SIG_ERR);
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}
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error_t
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hurd_safe_copyin (void *dest, const void *src, size_t nbytes)
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{
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error_t operate (struct hurd_signal_preempter *preempter)
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{
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memcpy (dest, src, nbytes);
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return 0;
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}
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return hurd_catch_signal (sigmask (SIGBUS) | sigmask (SIGSEGV),
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(vm_address_t) src, (vm_address_t) src + nbytes,
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&operate, SIG_ERR);
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}
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error_t
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hurd_safe_memmove (void *dest, const void *src, size_t nbytes)
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{
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jmp_buf buf;
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void throw (int signo, long int sigcode, struct sigcontext *scp)
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{ longjmp (buf, scp->sc_error ?: EGRATUITOUS); }
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struct hurd_signal_preempter src_preempter =
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{
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sigmask (SIGBUS) | sigmask (SIGSEGV),
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(vm_address_t) src, (vm_address_t) src + nbytes,
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NULL, (sighandler_t) &throw,
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};
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struct hurd_signal_preempter dest_preempter =
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{
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sigmask (SIGBUS) | sigmask (SIGSEGV),
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(vm_address_t) dest, (vm_address_t) dest + nbytes,
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NULL, (sighandler_t) &throw,
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&src_preempter
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};
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struct hurd_sigstate *const ss = _hurd_self_sigstate ();
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error_t error;
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/* This returns again with nonzero value when we preempt a signal. */
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error = setjmp (buf);
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if (error == 0)
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{
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/* Install a signal preempter for the thread. */
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__spin_lock (&ss->lock);
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src_preempter.next = ss->preempters;
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ss->preempters = &dest_preempter;
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__spin_unlock (&ss->lock);
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/* Do the copy; it might fault. */
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memmove (dest, src, nbytes);
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}
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/* Either memmove completed happily and ERROR is still zero, or it hit
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an expected signal and `throw' made setjmp return the signal error
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code in ERROR. Now we can remove the preempter and return. */
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__spin_lock (&ss->lock);
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assert (ss->preempters == &dest_preempter);
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ss->preempters = src_preempter.next;
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__spin_unlock (&ss->lock);
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return error;
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}
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@ -83,8 +83,20 @@ error_t hurd_catch_signal (sigset_t sigset,
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/* Convenience functions using `hurd_catch_signal'. */
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error_t hurd_safe_memmove (void *dest, const void *src, size_t nbytes);
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/* Like `memset', but catch faults in DEST. */
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error_t hurd_safe_memset (void *dest, int byte, size_t nbytes);
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/* Like `memcpy', but catch faults in SRC. */
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error_t hurd_safe_copyin (void *dest, const void *src, size_t nbytes);
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/* Like `memcpy', but catch faults in DEST. */
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error_t hurd_safe_copyout (void *dest, const void *src, size_t nbytes);
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/* Like `memmove', but catch faults in SRC or DEST.
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If only one region is expected to fault, it is more efficient
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to use `hurd_safe_copyin' or `hurd_safe_copyout' as appropriate. */
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error_t hurd_safe_memmove (void *dest, const void *src, size_t nbytes);
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#endif /* hurd/sigpreempt.h */
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@ -1,43 +0,0 @@
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/* Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#ifndef _DIRSTREAM_H
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#define _DIRSTREAM_H 1
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#define __need_size_t
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#include <stddef.h>
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#include <gnu/types.h> /* For __off_t. */
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/* Directory stream type.
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The BSD directory format is the same as `struct dirent', so `readdir'
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returns a pointer into the buffer we read directory data into. */
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struct __dirstream
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{
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int __fd; /* File descriptor. */
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char *__data; /* Directory block. */
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size_t __allocation; /* Space allocated for the block. */
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size_t __offset; /* Current offset into the block. */
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size_t __size; /* Total valid data in the block. */
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__off_t __pos; /* Position in directory of this block. */
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};
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#endif /* dirstream.h */
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@ -1,70 +0,0 @@
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/* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <limits.h>
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#include <stddef.h>
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#include <string.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include "direct.h"
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#include "dirstream.h"
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/* Read a directory entry from DIRP. */
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struct dirent *
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DEFUN(readdir, (dirp), DIR *dirp)
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{
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struct dirent *dp;
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if (dirp == NULL || dirp->__data == NULL)
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{
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errno = EINVAL;
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return NULL;
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}
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do
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{
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if (dirp->__offset >= dirp->__size)
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{
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/* We've emptied out our buffer. Refill it. */
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ssize_t bytes = __getdirentries (dirp->__fd, dirp->__data,
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dirp->__allocation, &dirp->__pos);
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if (bytes <= 0)
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return NULL;
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dirp->__size = (size_t) bytes;
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/* Reset the offset into the buffer. */
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dirp->__offset = 0;
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}
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dp = (struct dirent *) &dirp->__data[dirp->__offset];
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dirp->__offset += dp->d_reclen;
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#ifndef HAVE_D_TYPE
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dp->d_namlen = ((struct direct *) dp)->d_namlen;
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dp->d_type = DT_UNKNOWN;
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#endif
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/* Loop to ignore deleted files. */
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} while (dp->d_fileno == 0);
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return dp;
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}
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