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authorRoland McGrath <roland@gnu.org>1995-08-14 22:49:23 +0000
committerRoland McGrath <roland@gnu.org>1995-08-14 22:49:23 +0000
commit54da5be39c868b55c234c23bb38eb42babc084d7 (patch)
tree64fe7cd0dfeaef3a8b6f469f3a7a83a3a974067a /hurd/intr-msg.c
parent047f282dd7e83f24abce284dcc9d2d78cab42f9b (diff)
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Mon Aug 14 16:51:13 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
* hurd/thread-cancel.c: New file. * sysdeps/mach/hurd/i386/trampoline.c (_hurd_setup_sighandler): In rpc_wait case, frob mach_msg args to set timeout on receive. (_hurdsig_rcv_interrupted_p): Function removed. * sysdeps/mach/hurd/alpha/trampoline.c: Likewise. * sysdeps/mach/hurd/hppa/trampoline.c: Likewise. * sysdeps/mach/hurd/mips/trampoline.c: Likewise. * hurd/intr-msg.c: New file. * hurd/hurd/signal.h (struct hurd_sigstate): New member `cancel'. (_hurdsig_rcv_interrupted_p): Declaration removed. (HURD_EINTR_RPC): Macro removed. (_hurd_longjmp_thread_state, _hurd_interrupted_rpc_timeout): Declare these. * hurd/intr-rpc.h: New file. * hurd/intr-rpc.defs: Just import intr-rpc.h. * hurd/hurdsig.c (_hurd_interrupted_rpc_timeout): New variable. (interrupted_reply_port_location): Take new flag arg; only catch faults if it's set. (abort_rpcs): Rename to _hurdsig_abort_rpcs; take same new flag arg. No longer use _hurdsig_rcv_interrupted_p; instead compare PC to &_hurd_intr_rpc_msg_in_trap. If before it, mutate state to simulate MACH_SEND_INTERRUPTED return; on it, interrupt the operation. All callers changed. * hurd/hurd.h (hurd_thread_cancel, hurd_check_cancel): Declare these. * hurd/Makefile (distribute): Remove intr-rpc.awk. (sig): Add thread-cancel. (transform-user-stub, transform-user-stub-output): Variables removed. * sysdeps/mach/hurd/dl-sysdep.c: Change all RPCs from `__hurd_intr_rpc_*' to `__*'. (_hurd_intr_rpc_mach_msg): New function. (_hurd_thread_sigstate): Function removed. * sysdeps/mach/hurd/ioctl.c: Use _hurd_intr_rpc_mach_msg function, instead of __mach_msg inside HURD_EINTR_RPC macro. * sysdeps/generic/morecore.c [__GNU_LIBRARY__]: Declare `__sbrk' to take ptrdiff_t arg. * sysdeps/mach/hurd/fork.c: Remove _hurd_longjmp_thread_state decl. * sysdeps/mach/hurd/kill.c (kill_pid): Don't make `inline'. * libc-symbols.h [GCC >= 2.7] (strong_alias, weak_symbol, weak_alias): Use `extern' storage class.
Diffstat (limited to 'hurd/intr-msg.c')
-rw-r--r--hurd/intr-msg.c151
1 files changed, 151 insertions, 0 deletions
diff --git a/hurd/intr-msg.c b/hurd/intr-msg.c
new file mode 100644
index 0000000..cdcd8d5
--- /dev/null
+++ b/hurd/intr-msg.c
@@ -0,0 +1,151 @@
+/* Replacement for mach_msg used in interruptible Hurd RPCs.
+Copyright (C) 1995 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <mach.h>
+#include <mach/mig_errors.h>
+#include <hurd/signal.h>
+
+error_t
+_hurd_intr_rpc_mach_msg (mach_msg_header_t *msg,
+ mach_msg_option_t option,
+ mach_msg_size_t send_size,
+ mach_msg_size_t rcv_size,
+ mach_port_t rcv_name,
+ mach_msg_timeout_t timeout,
+ mach_port_t notify)
+{
+ struct hurd_sigstate *ss = _hurd_self_sigstate ();
+ error_t err;
+
+ /* Tell the signal thread that we are doing an interruptible RPC on
+ this port. If we get a signal and should return EINTR, the signal
+ thread will set this variable to MACH_PORT_NULL. The RPC might
+ return EINTR when some other thread gets a signal, in which case we
+ want to restart our call. */
+ ss->intr_port = msg->msgh_remote_port;
+
+ /* A signal may arrive here, after intr_port is set, but before
+ the mach_msg system call. The signal handler might do an
+ interruptible RPC, and clobber intr_port; then it would not be
+ set properly when we actually did send the RPC, and a later
+ signal wouldn't interrupt that RPC. So,
+ _hurd_setup_sighandler saves intr_port in the sigcontext, and
+ sigreturn restores it. */
+
+ message:
+
+ if (ss->cancel)
+ {
+ err = EINTR;
+ ss->cancel = 0;
+ }
+ else
+ /* err = intr_msg_trap (msg, option, send_size,
+ rcv_size, rcv_name, timeout, notify);
+ */
+ asm (".globl _hurd_intr_rpc_msg_do_trap\n"
+ ".globl _hurd_intr_rpc_msg_in_trap\n"
+ " movl %%esp, %%ecx\n"
+ " leal %1, %%esp\n"
+ " movl $-25, %%eax\n"
+ "_hurd_intr_rpc_msg_do_trap: lcall $7, $0 # status in %0\n"
+ "_hurd_intr_rpc_msg_in_trap: movl %%ecx, %%esp"
+ : "=a" (err) : "m" ((&msg)[1]) : "%ecx");
+
+ switch (err)
+ {
+ case MACH_SEND_INTERRUPTED: /* RPC didn't get out. */
+ if (ss->intr_port != MACH_PORT_NULL)
+ /* If this signal was for us and it should interrupt calls, the
+ signal thread will have cleared SS->intr_port.
+ Since it's not cleared, the signal was for another thread,
+ or SA_RESTART is set. Restart the interrupted call. */
+ goto message;
+ /* FALLTHROUGH */
+
+ case MACH_RCV_PORT_DIED:
+ /* Server didn't respond to interrupt_operation,
+ so the signal thread destroyed the reply port. */
+ /* FALLTHROUGH */
+
+ case MACH_RCV_TIMED_OUT:
+ /* The operation was supposedly interrupted, but still has
+ not returned. Declare it interrupted. */
+
+ err = EINTR;
+
+ /* The EINTR return indicates cancellation, so clear the flag. */
+ ss->cancel = 0;
+ break;
+
+ case MACH_RCV_INTERRUPTED: /* RPC sent; no reply. */
+ option &= ~MACH_SEND_MSG; /* Don't send again. */
+ if (ss->intr_port == MACH_PORT_NULL)
+ {
+ /* This signal or cancellation was for us. We need to wait for
+ the reply, but not hang forever. */
+ option |= MACH_RCV_TIMEOUT;
+ timeout = _hurd_interrupted_rpc_timeout;
+ }
+ goto message; /* Retry the receive. */
+
+ case MACH_MSG_SUCCESS:
+ if (option & MACH_RCV_MSG)
+ {
+ /* We got a reply. Was it EINTR? */
+ mig_reply_header_t *const reply = (void *) msg;
+ const union
+ {
+ mach_msg_type_t t;
+ int i;
+ } check =
+ { t: {
+ MACH_MSG_TYPE_INTEGER_32,
+ 32,
+ 1,
+ TRUE,
+ FALSE,
+ FALSE,
+ 0
+ } };
+ if (msg->msgh_size == sizeof *reply &&
+ !(msg->msgh_bits & MACH_MSGH_BITS_COMPLEX) &&
+ *(int *) &reply->RetCodeType == check.i &&
+ reply->RetCode == EINTR)
+ {
+ /* It is indeed EINTR. Is the interrupt for us? */
+ if (ss->intr_port != MACH_PORT_NULL)
+ /* Nope; repeat the RPC.
+ XXX Resources moved? */
+ goto message;
+ else
+ /* The EINTR return indicates cancellation, so clear the
+ flag. */
+ ss->cancel = 0;
+ }
+ }
+ break;
+
+ default: /* Quiet -Wswitch-enum. */
+ }
+
+ ss->intr_port = MACH_PORT_NULL;
+
+ return err;
+}