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author | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
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committer | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
commit | 5046dbb4a7eba5eccfd258f92f4735c9ffc8d069 (patch) | |
tree | 4470480d904b65cf14ca524f96f79eca818c3eaf /REORG.TODO/sysdeps/mach/hurd/sigwait.c | |
parent | 199fc19d3aaaf57944ef036e15904febe877fc93 (diff) | |
download | glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar.gz glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar.xz glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.zip |
Prepare for radical source tree reorganization. zack/build-layout-experiment
All top-level files and directories are moved into a temporary storage directory, REORG.TODO, except for files that will certainly still exist in their current form at top level when we're done (COPYING, COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which are moved to the new directory OldChangeLogs, instead), and the generated file INSTALL (which is just deleted; in the new order, there will be no generated files checked into version control).
Diffstat (limited to 'REORG.TODO/sysdeps/mach/hurd/sigwait.c')
-rw-r--r-- | REORG.TODO/sysdeps/mach/hurd/sigwait.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/mach/hurd/sigwait.c b/REORG.TODO/sysdeps/mach/hurd/sigwait.c new file mode 100644 index 0000000000..c9fd8fce88 --- /dev/null +++ b/REORG.TODO/sysdeps/mach/hurd/sigwait.c @@ -0,0 +1,133 @@ +/* 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 <errno.h> +#include <hurd.h> +#include <hurd/signal.h> +#include <hurd/msg.h> +#include <hurd/sigpreempt.h> +#include <assert.h> + +/* Select any of pending signals from SET or wait for any to arrive. */ +int +__sigwait (const sigset_t *set, int *sig) +{ + struct hurd_sigstate *ss; + sigset_t mask, ready; + int signo = 0; + struct hurd_signal_preemptor preemptor; + jmp_buf buf; + mach_port_t wait; + mach_msg_header_t msg; + + sighandler_t + preempt_fun (struct hurd_signal_preemptor *pe, + struct hurd_sigstate *ss, + int *sigp, + struct hurd_signal_detail *detail) + { + if (signo) + /* We've already been run; don't interfere. */ + return SIG_ERR; + + signo = *sigp; + + /* Make sure this is all kosher */ + assert (__sigismember (&mask, signo)); + + /* Make sure this signal is unblocked */ + __sigdelset (&ss->blocked, signo); + + return pe->handler; + } + + void + handler (int sig) + { + assert (sig == signo); + longjmp (buf, 1); + } + + wait = __mach_reply_port (); + + if (set != NULL) + /* Crash before locking */ + mask = *set; + else + __sigemptyset (&mask); + + ss = _hurd_self_sigstate (); + __spin_lock (&ss->lock); + + /* See if one of these signals is currently pending. */ + __sigandset (&ready, &ss->pending, &mask); + if (! __sigisemptyset (&ready)) + { + for (signo = 1; signo < NSIG; signo++) + if (__sigismember (&ready, signo)) + { + __sigdelset (&ready, signo); + goto all_done; + } + /* Huh? Where'd it go? */ + abort (); + } + + /* Wait for one of them to show up. */ + + if (!setjmp (buf)) + { + /* Make the preemptor */ + preemptor.signals = mask; + preemptor.first = 0; + preemptor.last = -1; + preemptor.preemptor = preempt_fun; + preemptor.handler = handler; + + /* Install this preemptor */ + preemptor.next = ss->preemptors; + ss->preemptors = &preemptor; + + __spin_unlock (&ss->lock); + + /* Wait. */ + __mach_msg (&msg, MACH_RCV_MSG, 0, sizeof (msg), wait, + MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL); + abort (); + } + else + { + assert (signo); + + __spin_lock (&ss->lock); + + /* Delete our preemptor. */ + assert (ss->preemptors == &preemptor); + ss->preemptors = preemptor.next; + } + + +all_done: + spin_unlock (&ss->lock); + + __mach_port_destroy (__mach_task_self (), wait); + *sig = signo; + return 0; +} + +libc_hidden_def (__sigwait) +weak_alias (__sigwait, sigwait) |