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Make wait6(2), waitid(3) and ppoll(2) cancellation points. The

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waitid() function is required to be cancellable by the standard.  The
wait6() and ppoll() follow the other syscalls in their groups.

Reviewed by:	jhb, jilles (previous versions)
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2015-04-18 21:35:41 +00:00
parent 9dda94167d
commit 3d0045bb2b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=281712
8 changed files with 164 additions and 2 deletions
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5
lib/libc/gen/waitid.c
View File

@ -37,6 +37,7 @@ __FBSDID("$FreeBSD$");
#include <signal.h>
#include <errno.h>
#include "un-namespace.h"
#include "libc_private.h"
int
__waitid(idtype_t idtype, id_t id, siginfo_t *info, int flags)
@ -44,7 +45,9 @@ __waitid(idtype_t idtype, id_t id, siginfo_t *info, int flags)
int status;
pid_t ret;
ret = _wait6(idtype, id, &status, flags, NULL, info);
ret = ((pid_t (*)(idtype_t, id_t, int *, int, struct __wrusage *,
siginfo_t *))__libc_interposing[INTERPOS_wait6])(idtype, id,
&status, flags, NULL, info);
/*
* According to SUSv4, waitid() shall not return a PID when a

8
lib/libc/include/libc_private.h
View File

@ -222,6 +222,8 @@ enum {
INTERPOS_spinlock,
INTERPOS_spinunlock,
INTERPOS_kevent,
INTERPOS_wait6,
INTERPOS_ppoll,
INTERPOS_MAX
};
@ -305,6 +307,8 @@ struct timeval;
struct timezone;
struct __siginfo;
struct __ucontext;
struct __wrusage;
enum idtype;
int __sys_aio_suspend(const struct aiocb * const[], int,
const struct timespec *);
int __sys_accept(int, struct sockaddr *, __socklen_t *);
@ -329,6 +333,8 @@ int __sys_pselect(int, struct fd_set *, struct fd_set *,
struct fd_set *, const struct timespec *,
const __sigset_t *);
int __sys_poll(struct pollfd *, unsigned, int);
int __sys_ppoll(struct pollfd *, unsigned, const struct timespec *,
const __sigset_t *);
__ssize_t __sys_pread(int, void *, __size_t, __off_t);
__ssize_t __sys_pwrite(int, const void *, __size_t, __off_t);
__ssize_t __sys_read(int, void *, __size_t);
@ -357,6 +363,8 @@ int __sys_thr_kill(long, int);
int __sys_thr_self(long *);
int __sys_truncate(const char *, __off_t);
__pid_t __sys_wait4(__pid_t, int *, int, struct rusage *);
__pid_t __sys_wait6(enum idtype, __id_t, int *, int,
struct __wrusage *, struct __siginfo *);
__ssize_t __sys_write(int, const void *, __size_t);
__ssize_t __sys_writev(int, const struct iovec *, int);

2
lib/libc/sys/Makefile.inc
View File

@ -57,6 +57,7 @@ INTERPOSED = \
open \
openat \
poll \
ppoll \
pselect \
read \
readv \
@ -73,6 +74,7 @@ INTERPOSED = \
sigwaitinfo \
swapcontext \
wait4 \
wait6 \
write \
writev

2
lib/libc/sys/interposing_table.c
View File

@ -76,6 +76,8 @@ interpos_func_t __libc_interposing[INTERPOS_MAX] = {
SLOT(spinlock, __libc_spinlock_stub),
SLOT(spinunlock, __libc_spinunlock_stub),
SLOT(kevent, __sys_kevent),
SLOT(wait6, __sys_wait6),
SLOT(ppoll, __sys_ppoll),
};
#undef SLOT

51
lib/libc/sys/ppoll.c Normal file
View File

@ -0,0 +1,51 @@
/*
* Copyright (c) 2015 The FreeBSD Foundation.
* All rights reserved.
*
* Portions of this software were developed by Konstantin Belousov
* under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice(s), this list of conditions and the following disclaimer as
* the first lines of this file unmodified other than the possible
* addition of one or more copyright notices.
* 2. Redistributions in binary form must reproduce the above copyright
* notice(s), this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/poll.h>
#include "libc_private.h"
__weak_reference(__sys_ppoll, __ppoll);
#pragma weak ppoll
int
ppoll(struct pollfd pfd[], nfds_t nfds, const struct timespec *__restrict
timeout, const sigset_t *__restrict newsigmask)
{
return (((int (*)(struct pollfd *, nfds_t, const struct timespec *,
const sigset_t *)) __libc_interposing[INTERPOS_ppoll])(pfd, nfds,
timeout, newsigmask));
}

52
lib/libc/sys/wait6.c Normal file
View File

@ -0,0 +1,52 @@
/*
* Copyright (c) 2015 The FreeBSD Foundation.
* All rights reserved.
*
* Portions of this software were developed by Konstantin Belousov
* under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice(s), this list of conditions and the following disclaimer as
* the first lines of this file unmodified other than the possible
* addition of one or more copyright notices.
* 2. Redistributions in binary form must reproduce the above copyright
* notice(s), this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include "libc_private.h"
__weak_reference(__sys_wait6, __wait6);
#pragma weak wait6
pid_t
wait6(idtype_t idtype, id_t id, int *status, int options, struct __wrusage *ru,
siginfo_t *infop)
{
return (((pid_t (*)(idtype_t, id_t, int *, int, struct __wrusage *,
siginfo_t *))__libc_interposing[INTERPOS_wait6])(idtype, id,
status, options, ru, infop));
}

41
lib/libthr/thread/thr_syscalls.c
View File

@ -321,6 +321,26 @@ __thr_poll(struct pollfd *fds, unsigned int nfds, int timeout)
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the system call returns something,
* the thread is not canceled.
*/
static int
__thr_ppoll(struct pollfd pfd[], nfds_t nfds, const struct timespec *
timeout, const sigset_t *newsigmask)
{
struct pthread *curthread;
int ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_ppoll(pfd, nfds, timeout, newsigmask);
_thr_cancel_leave(curthread, ret == -1);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the system call returns something,
@ -543,6 +563,25 @@ __thr_wait4(pid_t pid, int *status, int options, struct rusage *rusage)
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the system call returns
* a child pid, the thread is not canceled.
*/
static pid_t
__thr_wait6(idtype_t idtype, id_t id, int *status, int options,
struct __wrusage *ru, siginfo_t *infop)
{
struct pthread *curthread;
pid_t ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_wait6(idtype, id, status, options, ru, infop);
_thr_cancel_leave(curthread, ret <= 0);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the thread wrote some data,
@ -623,6 +662,8 @@ __thr_interpose_libc(void)
SLOT(spinlock);
SLOT(spinunlock);
SLOT(kevent);
SLOT(wait6);
SLOT(ppoll);
#undef SLOT
*(__libc_interposing_slot(
INTERPOS__pthread_mutex_init_calloc_cb)) =

5
share/man/man3/pthread_testcancel.3
View File

@ -1,5 +1,5 @@
.\" $FreeBSD$
.Dd March 29, 2015
.Dd April 16, 2015
.Dt PTHREAD_TESTCANCEL 3
.Os
.Sh NAME
@ -132,6 +132,7 @@ argument is non-zero.
.It Fn openat
.It Fn pause
.It Fn poll
.It Fn ppoll
.It Fn pselect
.It Fn pthread_cond_timedwait
.It Fn pthread_cond_wait
@ -159,6 +160,8 @@ argument is non-zero.
.It Fn wait
.It Fn wait3
.It Fn wait4
.It Fn wait6
.It Fn waitid
.It Fn waitpid
.It Fn write
.It Fn writev