Merge remote-tracking branch 'origin/master'

[unleashed/lotheac.git] / usr / src / lib / libc / port / threads / scalls.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 * Copyright (c) 2015, Joyent, Inc.  All rights reserved.
 */

/* Copyright (c) 2013, OmniTI Computer Consulting, Inc. All rights reserved. */

#include "lint.h"
#include "thr_uberdata.h"
#include <stdarg.h>
#include <poll.h>
#include <stropts.h>
#include <dlfcn.h>
#include <wait.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/file.h>
#include <sys/door.h>

#pragma weak lockf64 = lockf
#pragma weak openat64 = openat
#pragma weak open64 = open
#pragma weak creat64 = creat
#pragma weak pread64 = pread
#pragma weak preadv64 = preadv
#pragma weak pwrite64 = pwrite
#pragma weak pwritev64 = pwritev

/*
 * atfork_lock protects the pthread_atfork() data structures.
 *
 * fork_lock does double-duty.  Not only does it (and atfork_lock)
 * serialize calls to fork() and forkall(), but it also serializes calls
 * to thr_suspend() and thr_continue() (because fork() and forkall() also
 * suspend and continue other threads and they want no competition).
 *
 * Functions called in dlopen()ed L10N objects can do anything, including
 * call malloc() and free().  Such calls are not fork-safe when protected
 * by an ordinary mutex that is acquired in libc's prefork processing
 * because, with an interposed malloc library present, there would be a
 * lock ordering violation due to the pthread_atfork() prefork function
 * in the interposition library acquiring its malloc lock(s) before the
 * ordinary mutex in libc being acquired by libc's prefork functions.
 *
 * Within libc, calls to malloc() and free() are fork-safe if the calls
 * are made while holding no other libc locks.  This covers almost all
 * of libc's malloc() and free() calls.  For those libc code paths, such
 * as the above-mentioned L10N calls, that require serialization and that
 * may call malloc() or free(), libc uses callout_lock_enter() to perform
 * the serialization.  This works because callout_lock is not acquired as
 * part of running the pthread_atfork() prefork handlers (to avoid the
 * lock ordering violation described above).  Rather, it is simply
 * reinitialized in postfork1_child() to cover the case that some
 * now-defunct thread might have been suspended while holding it.
 */

void
fork_lock_enter(void)
{
        ASSERT(curthread->ul_critical == 0);
        (void) mutex_lock(&curthread->ul_uberdata->fork_lock);
}

void
fork_lock_exit(void)
{
        ASSERT(curthread->ul_critical == 0);
        (void) mutex_unlock(&curthread->ul_uberdata->fork_lock);
}

/*
 * Use cancel_safe_mutex_lock() to protect against being cancelled while
 * holding callout_lock and calling outside of libc (via L10N plugins).
 * We will honor a pending cancellation request when callout_lock_exit()
 * is called, by calling cancel_safe_mutex_unlock().
 */
void
callout_lock_enter(void)
{
        ASSERT(curthread->ul_critical == 0);
        cancel_safe_mutex_lock(&curthread->ul_uberdata->callout_lock);
}

void
callout_lock_exit(void)
{
        ASSERT(curthread->ul_critical == 0);
        cancel_safe_mutex_unlock(&curthread->ul_uberdata->callout_lock);
}

pid_t
forkx(int flags)
{
        ulwp_t *self = curthread;
        uberdata_t *udp = self->ul_uberdata;
        pid_t pid;

        if (self->ul_vfork) {
                /*
                 * We are a child of vfork(); omit all of the fork
                 * logic and go straight to the system call trap.
                 * A vfork() child of a multithreaded parent
                 * must never call fork().
                 */
                if (udp->uberflags.uf_mt) {
                        errno = ENOTSUP;
                        return (-1);
                }
                pid = __forkx(flags);
                if (pid == 0) {         /* child */
                        udp->pid = getpid();
                        self->ul_vfork = 0;
                }
                return (pid);
        }

        sigoff(self);
        if (self->ul_fork) {
                /*
                 * Cannot call fork() from a fork handler.
                 */
                sigon(self);
                errno = EDEADLK;
                return (-1);
        }
        self->ul_fork = 1;

        /*
         * The functions registered by pthread_atfork() are defined by
         * the application and its libraries and we must not hold any
         * internal lmutex_lock()-acquired locks while invoking them.
         * We hold only udp->atfork_lock to protect the atfork linkages.
         * If one of these pthread_atfork() functions attempts to fork
         * or to call pthread_atfork(), libc will detect the error and
         * fail the call with EDEADLK.  Otherwise, the pthread_atfork()
         * functions are free to do anything they please (except they
         * will not receive any signals).
         */
        (void) mutex_lock(&udp->atfork_lock);

        /*
         * Posix (SUSv3) requires fork() to be async-signal-safe.
         * This cannot be made to happen with fork handlers in place
         * (they grab locks).  To be in nominal compliance, don't run
         * any fork handlers if we are called within a signal context.
         * This leaves the child process in a questionable state with
         * respect to its locks, but at least the parent process does
         * not become deadlocked due to the calling thread attempting
         * to acquire a lock that it already owns.
         */
        if (self->ul_siglink == NULL)
                _prefork_handler();

        /*
         * Block every other thread attempting thr_suspend() or thr_continue().
         */
        (void) mutex_lock(&udp->fork_lock);

        /*
         * Block all signals.
         * Just deferring them via sigoff() is not enough.
         * We have to avoid taking a deferred signal in the child
         * that was actually sent to the parent before __forkx().
         */
        block_all_signals(self);

        /*
         * This suspends all threads but this one, leaving them
         * suspended outside of any critical regions in the library.
         * Thus, we are assured that no lmutex_lock()-acquired library
         * locks are held while we invoke fork() from the current thread.
         */
        suspend_fork();

        pid = __forkx(flags);

        if (pid == 0) {         /* child */
                /*
                 * Clear our schedctl pointer.
                 * Discard any deferred signal that was sent to the parent.
                 * Because we blocked all signals before __forkx(), a
                 * deferred signal cannot have been taken by the child.
                 */
                self->ul_schedctl_called = NULL;
                self->ul_schedctl = NULL;
                self->ul_cursig = 0;
                self->ul_siginfo.si_signo = 0;
                udp->pid = getpid();
                /* reset the library's data structures to reflect one thread */
                unregister_locks();
                postfork1_child();
                restore_signals(self);
                (void) mutex_unlock(&udp->fork_lock);
                if (self->ul_siglink == NULL)
                        _postfork_child_handler();
        } else {
                /* restart all threads that were suspended for fork() */
                continue_fork(0);
                restore_signals(self);
                (void) mutex_unlock(&udp->fork_lock);
                if (self->ul_siglink == NULL)
                        _postfork_parent_handler();
        }

        (void) mutex_unlock(&udp->atfork_lock);
        self->ul_fork = 0;
        sigon(self);

        return (pid);
}

/*
 * fork() is fork1() for both Posix threads and Solaris threads.
 * The forkall() interface exists for applications that require
 * the semantics of replicating all threads.
 */
#pragma weak fork1 = fork
pid_t
fork(void)
{
        return (forkx(0));
}

/*
 * Much of the logic here is the same as in forkx().
 * See the comments in forkx(), above.
 */
pid_t
forkallx(int flags)
{
        ulwp_t *self = curthread;
        uberdata_t *udp = self->ul_uberdata;
        pid_t pid;

        if (self->ul_vfork) {
                if (udp->uberflags.uf_mt) {
                        errno = ENOTSUP;
                        return (-1);
                }
                pid = __forkallx(flags);
                if (pid == 0) {         /* child */
                        udp->pid = getpid();
                        self->ul_vfork = 0;
                }
                return (pid);
        }

        sigoff(self);
        if (self->ul_fork) {
                sigon(self);
                errno = EDEADLK;
                return (-1);
        }
        self->ul_fork = 1;
        (void) mutex_lock(&udp->atfork_lock);
        (void) mutex_lock(&udp->fork_lock);
        block_all_signals(self);
        suspend_fork();

        pid = __forkallx(flags);

        if (pid == 0) {
                self->ul_schedctl_called = NULL;
                self->ul_schedctl = NULL;
                self->ul_cursig = 0;
                self->ul_siginfo.si_signo = 0;
                udp->pid = getpid();
                unregister_locks();
                continue_fork(1);
        } else {
                continue_fork(0);
        }
        restore_signals(self);
        (void) mutex_unlock(&udp->fork_lock);
        (void) mutex_unlock(&udp->atfork_lock);
        self->ul_fork = 0;
        sigon(self);

        return (pid);
}

pid_t
forkall(void)
{
        return (forkallx(0));
}

/*
 * For the implementation of cancellation at cancellation points.
 */
#define PROLOGUE                                                        \
{                                                                       \
        ulwp_t *self = curthread;                                       \
        int nocancel =                                                  \
            (self->ul_vfork | self->ul_nocancel | self->ul_libc_locks | \
            self->ul_critical | self->ul_sigdefer);                     \
        int abort = 0;                                                  \
        if (nocancel == 0) {                                            \
                self->ul_save_async = self->ul_cancel_async;            \
                if (!self->ul_cancel_disabled) {                        \
                        self->ul_cancel_async = 1;                      \
                        if (self->ul_cancel_pending)                    \
                                pthread_exit(PTHREAD_CANCELED);         \
                }                                                       \
                self->ul_sp = stkptr();                                 \
        } else if (self->ul_cancel_pending &&                           \
            !self->ul_cancel_disabled) {                                \
                set_cancel_eintr_flag(self);                            \
                abort = 1;                                              \
        }

#define EPILOGUE                                                        \
        if (nocancel == 0) {                                            \
                self->ul_sp = 0;                                        \
                self->ul_cancel_async = self->ul_save_async;            \
        }                                                               \
}

/*
 * Perform the body of the action required by most of the cancelable
 * function calls.  The return(function_call) part is to allow the
 * compiler to make the call be executed with tail recursion, which
 * saves a register window on sparc and slightly (not much) improves
 * the code for x86/x64 compilations.
 */
#define PERFORM(function_call)                                          \
        PROLOGUE                                                        \
        if (abort) {                                                    \
                *self->ul_errnop = EINTR;                               \
                return (-1);                                            \
        }                                                               \
        if (nocancel)                                                   \
                return (function_call);                                 \
        rv = function_call;                                             \
        EPILOGUE                                                        \
        return (rv);

/*
 * Specialized prologue for sigsuspend() and pollsys().
 * These system calls pass a signal mask to the kernel.
 * The kernel replaces the thread's signal mask with the
 * temporary mask before the thread goes to sleep.  If
 * a signal is received, the signal handler will execute
 * with the temporary mask, as modified by the sigaction
 * for the particular signal.
 *
 * We block all signals until we reach the kernel with the
 * temporary mask.  This eliminates race conditions with
 * setting the signal mask while signals are being posted.
 */
#define PROLOGUE_MASK(sigmask)                                          \
{                                                                       \
        ulwp_t *self = curthread;                                       \
        int nocancel =                                                  \
            (self->ul_vfork | self->ul_nocancel | self->ul_libc_locks | \
            self->ul_critical | self->ul_sigdefer);                     \
        if (!self->ul_vfork) {                                          \
                if (sigmask) {                                          \
                        block_all_signals(self);                        \
                        self->ul_tmpmask = *sigmask;                    \
                        delete_reserved_signals(&self->ul_tmpmask);     \
                        self->ul_sigsuspend = 1;                        \
                }                                                       \
                if (nocancel == 0) {                                    \
                        self->ul_save_async = self->ul_cancel_async;    \
                        if (!self->ul_cancel_disabled) {                \
                                self->ul_cancel_async = 1;              \
                                if (self->ul_cancel_pending) {          \
                                        if (self->ul_sigsuspend) {      \
                                                self->ul_sigsuspend = 0;\
                                                restore_signals(self);  \
                                        }                               \
                                        pthread_exit(PTHREAD_CANCELED); \
                                }                                       \
                        }                                               \
                        self->ul_sp = stkptr();                         \
                }                                                       \
        }

/*
 * If a signal is taken, we return from the system call wrapper with
 * our original signal mask restored (see code in call_user_handler()).
 * If not (self->ul_sigsuspend is still non-zero), we must restore our
 * original signal mask ourself.
 */
#define EPILOGUE_MASK                                                   \
        if (nocancel == 0) {                                            \
                self->ul_sp = 0;                                        \
                self->ul_cancel_async = self->ul_save_async;            \
        }                                                               \
        if (self->ul_sigsuspend) {                                      \
                self->ul_sigsuspend = 0;                                \
                restore_signals(self);                                  \
        }                                                               \
}

/*
 * Cancellation prologue and epilogue functions,
 * for cancellation points too complex to include here.
 */
void
_cancel_prologue(void)
{
        ulwp_t *self = curthread;

        self->ul_cancel_prologue =
            (self->ul_vfork | self->ul_nocancel | self->ul_libc_locks |
            self->ul_critical | self->ul_sigdefer) != 0;
        if (self->ul_cancel_prologue == 0) {
                self->ul_save_async = self->ul_cancel_async;
                if (!self->ul_cancel_disabled) {
                        self->ul_cancel_async = 1;
                        if (self->ul_cancel_pending)
                                pthread_exit(PTHREAD_CANCELED);
                }
                self->ul_sp = stkptr();
        } else if (self->ul_cancel_pending &&
            !self->ul_cancel_disabled) {
                set_cancel_eintr_flag(self);
        }
}

void
_cancel_epilogue(void)
{
        ulwp_t *self = curthread;

        if (self->ul_cancel_prologue == 0) {
                self->ul_sp = 0;
                self->ul_cancel_async = self->ul_save_async;
        }
}

/*
 * Called from _thrp_join() (thr_join() is a cancellation point)
 */
int
lwp_wait(thread_t tid, thread_t *found)
{
        int error;

        PROLOGUE
        if (abort)
                return (EINTR);
        while ((error = __lwp_wait(tid, found)) == EINTR && !cancel_active())
                continue;
        EPILOGUE
        return (error);
}

ssize_t
read(int fd, void *buf, size_t size)
{
        extern ssize_t __read(int, void *, size_t);
        ssize_t rv;

        PERFORM(__read(fd, buf, size))
}

ssize_t
write(int fd, const void *buf, size_t size)
{
        extern ssize_t __write(int, const void *, size_t);
        ssize_t rv;

        PERFORM(__write(fd, buf, size))
}

int
getmsg(int fd, struct strbuf *ctlptr, struct strbuf *dataptr,
        int *flagsp)
{
        extern int __getmsg(int, struct strbuf *, struct strbuf *, int *);
        int rv;

        PERFORM(__getmsg(fd, ctlptr, dataptr, flagsp))
}

int
getpmsg(int fd, struct strbuf *ctlptr, struct strbuf *dataptr,
        int *bandp, int *flagsp)
{
        extern int __getpmsg(int, struct strbuf *, struct strbuf *,
            int *, int *);
        int rv;

        PERFORM(__getpmsg(fd, ctlptr, dataptr, bandp, flagsp))
}

#pragma weak __xpg4_putmsg = putmsg
#pragma weak __xpg4_putpmsg = putpmsg

int
putmsg(int fd, const struct strbuf *ctlptr,
        const struct strbuf *dataptr, int flags)
{
        extern int __putmsg(int, const struct strbuf *,
            const struct strbuf *, int);
        int rv;

        PERFORM(__putmsg(fd, ctlptr, dataptr, flags|MSG_XPG4))
}

int
putpmsg(int fd, const struct strbuf *ctlptr,
        const struct strbuf *dataptr, int band, int flags)
{
        extern int __putpmsg(int, const struct strbuf *,
            const struct strbuf *, int, int);
        int rv;

        PERFORM(__putpmsg(fd, ctlptr, dataptr, band, flags|MSG_XPG4))
}

int
nanosleep(const timespec_t *rqtp, timespec_t *rmtp)
{
        int error;

        PROLOGUE
        error = abort? EINTR : __nanosleep(rqtp, rmtp);
        EPILOGUE
        if (error) {
                errno = error;
                return (-1);
        }
        return (0);
}

int
clock_nanosleep(clockid_t clock_id, int flags,
        const timespec_t *rqtp, timespec_t *rmtp)
{
        timespec_t reltime;
        hrtime_t start;
        hrtime_t rqlapse;
        hrtime_t lapse;
        int error;

        switch (clock_id) {
        case CLOCK_VIRTUAL:
        case CLOCK_PROCESS_CPUTIME_ID:
        case CLOCK_THREAD_CPUTIME_ID:
                return (ENOTSUP);
        case CLOCK_REALTIME:
        case CLOCK_HIGHRES:
                break;
        default:
                return (EINVAL);
        }
        if (flags & TIMER_ABSTIME) {
                abstime_to_reltime(clock_id, rqtp, &reltime);
                rmtp = NULL;
        } else {
                reltime = *rqtp;
                if (clock_id == CLOCK_HIGHRES)
                        start = gethrtime();
        }
restart:
        PROLOGUE
        error = abort? EINTR : __nanosleep(&reltime, rmtp);
        EPILOGUE
        if (error == 0 && clock_id == CLOCK_HIGHRES) {
                /*
                 * Don't return yet if we didn't really get a timeout.
                 * This can happen if we return because someone resets
                 * the system clock.
                 */
                if (flags & TIMER_ABSTIME) {
                        if ((hrtime_t)(uint32_t)rqtp->tv_sec * NANOSEC +
                            rqtp->tv_nsec > gethrtime()) {
                                abstime_to_reltime(clock_id, rqtp, &reltime);
                                goto restart;
                        }
                } else {
                        rqlapse = (hrtime_t)(uint32_t)rqtp->tv_sec * NANOSEC +
                            rqtp->tv_nsec;
                        lapse = gethrtime() - start;
                        if (rqlapse > lapse) {
                                hrt2ts(rqlapse - lapse, &reltime);
                                goto restart;
                        }
                }
        }
        if (error == 0 && clock_id == CLOCK_REALTIME &&
            (flags & TIMER_ABSTIME)) {
                /*
                 * Don't return yet just because someone reset the
                 * system clock.  Recompute the new relative time
                 * and reissue the nanosleep() call if necessary.
                 *
                 * Resetting the system clock causes all sorts of
                 * problems and the SUSV3 standards body should
                 * have made the behavior of clock_nanosleep() be
                 * implementation-defined in such a case rather than
                 * being specific about honoring the new system time.
                 * Standards bodies are filled with fools and idiots.
                 */
                abstime_to_reltime(clock_id, rqtp, &reltime);
                if (reltime.tv_sec != 0 || reltime.tv_nsec != 0)
                        goto restart;
        }
        return (error);
}

unsigned int
sleep(unsigned int sec)
{
        unsigned int rem = 0;
        timespec_t ts;
        timespec_t tsr;

        ts.tv_sec = (time_t)sec;
        ts.tv_nsec = 0;
        if (nanosleep(&ts, &tsr) == -1 && errno == EINTR) {
                rem = (unsigned int)tsr.tv_sec;
                if (tsr.tv_nsec >= NANOSEC / 2)
                        rem++;
        }
        return (rem);
}

int
usleep(useconds_t usec)
{
        timespec_t ts;

        ts.tv_sec = usec / MICROSEC;
        ts.tv_nsec = (long)(usec % MICROSEC) * 1000;
        (void) nanosleep(&ts, NULL);
        return (0);
}

int
close(int fildes)
{
        extern void _aio_close(int);
        extern int __close(int);
        int rv;

        /*
         * If we call _aio_close() while in a critical region,
         * we will draw an ASSERT() failure, so don't do it.
         * No calls to close() from within libc need _aio_close();
         * only the application's calls to close() need this,
         * and such calls are never from a libc critical region.
         */
        if (curthread->ul_critical == 0)
                _aio_close(fildes);
        PERFORM(__close(fildes))
}

int
door_call(int d, door_arg_t *params)
{
        extern int __door_call(int, door_arg_t *);
        int rv;

        PERFORM(__door_call(d, params))
}

int
fcntl(int fildes, int cmd, ...)
{
        extern int __fcntl(int, int, ...);
        intptr_t arg;
        int rv;
        va_list ap;

        va_start(ap, cmd);
        arg = va_arg(ap, intptr_t);
        va_end(ap);
        if (cmd != F_SETLKW)
                return (__fcntl(fildes, cmd, arg));
        PERFORM(__fcntl(fildes, cmd, arg))
}

int
fdatasync(int fildes)
{
        extern int __fdsync(int, int);
        int rv;

        PERFORM(__fdsync(fildes, O_DSYNC))
}

int
fsync(int fildes)
{
        extern int __fdsync(int, int);
        int rv;

        PERFORM(__fdsync(fildes, O_SYNC))
}

int
lockf(int fildes, int function, off_t size)
{
        extern int __lockf(int, int, off_t);
        int rv;

        PERFORM(__lockf(fildes, function, size))
}

ssize_t
msgrcv(int msqid, void *msgp, size_t msgsz, long msgtyp, int msgflg)
{
        extern ssize_t __msgrcv(int, void *, size_t, long, int);
        ssize_t rv;

        PERFORM(__msgrcv(msqid, msgp, msgsz, msgtyp, msgflg))
}

int
msgsnd(int msqid, const void *msgp, size_t msgsz, int msgflg)
{
        extern int __msgsnd(int, const void *, size_t, int);
        int rv;

        PERFORM(__msgsnd(msqid, msgp, msgsz, msgflg))
}

int
msync(void *addr, size_t len, int flags)
{
        extern int __msync(void *, size_t, int);
        int rv;

        PERFORM(__msync(addr, len, flags))
}

int
openat(int fd, const char *path, int oflag, ...)
{
        mode_t mode;
        int rv;
        va_list ap;

        va_start(ap, oflag);
        mode = va_arg(ap, mode_t);
        va_end(ap);
        PERFORM(__openat(fd, path, oflag, mode))
}

int
open(const char *path, int oflag, ...)
{
        mode_t mode;
        int rv;
        va_list ap;

        va_start(ap, oflag);
        mode = va_arg(ap, mode_t);
        va_end(ap);
        PERFORM(__open(path, oflag, mode))
}

int
creat(const char *path, mode_t mode)
{
        return (open(path, O_WRONLY | O_CREAT | O_TRUNC, mode));
}

int
pause(void)
{
        extern int __pause(void);
        int rv;

        PERFORM(__pause())
}

ssize_t
pread(int fildes, void *buf, size_t nbyte, off_t offset)
{
        extern ssize_t __pread(int, void *, size_t, off_t);
        ssize_t rv;

        PERFORM(__pread(fildes, buf, nbyte, offset))
}

ssize_t
preadv(int fildes, const struct iovec *iov, int iovcnt, off_t offset)
{

        extern ssize_t __preadv(int, const struct iovec *, int, off_t, off_t);
        ssize_t rv;

        PERFORM(__preadv(fildes, iov, iovcnt, offset, 0))
}
ssize_t
pwrite(int fildes, const void *buf, size_t nbyte, off_t offset)
{
        extern ssize_t __pwrite(int, const void *, size_t, off_t);
        ssize_t rv;

        PERFORM(__pwrite(fildes, buf, nbyte, offset))
}

ssize_t
pwritev(int fildes, const struct iovec *iov, int iovcnt, off_t offset)
{
        extern ssize_t __pwritev(int, const struct iovec *, int, off_t, off_t);
        ssize_t rv;

        PERFORM(__pwritev(fildes, iov, iovcnt, offset, 0))
}

ssize_t
readv(int fildes, const struct iovec *iov, int iovcnt)
{
        extern ssize_t __readv(int, const struct iovec *, int);
        ssize_t rv;

        PERFORM(__readv(fildes, iov, iovcnt))
}

int
sigpause(int sig)
{
        extern int __sigpause(int);
        int rv;

        PERFORM(__sigpause(sig))
}

int
sigsuspend(const sigset_t *set)
{
        extern int __sigsuspend(const sigset_t *);
        int rv;

        PROLOGUE_MASK(set)
        rv = __sigsuspend(set);
        EPILOGUE_MASK
        return (rv);
}

int
_pollsys(struct pollfd *fds, nfds_t nfd, const timespec_t *timeout,
        const sigset_t *sigmask)
{
        extern int __pollsys(struct pollfd *, nfds_t, const timespec_t *,
            const sigset_t *);
        int rv;

        PROLOGUE_MASK(sigmask)
        rv = __pollsys(fds, nfd, timeout, sigmask);
        EPILOGUE_MASK
        return (rv);
}

int
sigtimedwait(const sigset_t *set, siginfo_t *infop, const timespec_t *timeout)
{
        extern int __sigtimedwait(const sigset_t *, siginfo_t *,
            const timespec_t *);
        siginfo_t info;
        int sig;

        PROLOGUE
        if (abort) {
                *self->ul_errnop = EINTR;
                sig = -1;
        } else {
                sig = __sigtimedwait(set, &info, timeout);
                if (sig == SIGCANCEL &&
                    (SI_FROMKERNEL(&info) || info.si_code == SI_LWP)) {
                        do_sigcancel();
                        *self->ul_errnop = EINTR;
                        sig = -1;
                }
        }
        EPILOGUE
        if (sig != -1 && infop)
                (void) memcpy(infop, &info, sizeof (*infop));
        return (sig);
}

#pragma weak __posix_sigwait = sigwait

int
sigwait(const sigset_t *set, int *sig)
{
        if ((*sig = sigtimedwait(set, NULL, NULL)) != -1)
                return 0;
        if (errno == 0)
                errno = EINVAL;
        return errno;
}

int
sigwaitinfo(const sigset_t *set, siginfo_t *info)
{
        return (sigtimedwait(set, info, NULL));
}

int
sigqueue(pid_t pid, int signo, const union sigval value)
{
        extern int __sigqueue(pid_t pid, int signo,
            /* const union sigval */ void *value, int si_code, int block);
        return (__sigqueue(pid, signo, value.sival_ptr, SI_QUEUE, 0));
}

int
_so_accept(int sock, struct sockaddr *addr, uint_t *addrlen, int version,
    int flags)
{
        extern int __so_accept(int, struct sockaddr *, uint_t *, int, int);
        int rv;

        PERFORM(__so_accept(sock, addr, addrlen, version, flags))
}

int
_so_connect(int sock, struct sockaddr *addr, uint_t addrlen, int version)
{
        extern int __so_connect(int, struct sockaddr *, uint_t, int);
        int rv;

        PERFORM(__so_connect(sock, addr, addrlen, version))
}

int
_so_recv(int sock, void *buf, size_t len, int flags)
{
        extern int __so_recv(int, void *, size_t, int);
        int rv;

        PERFORM(__so_recv(sock, buf, len, flags))
}

int
_so_recvfrom(int sock, void *buf, size_t len, int flags,
    struct sockaddr *addr, int *addrlen)
{
        extern int __so_recvfrom(int, void *, size_t, int,
            struct sockaddr *, int *);
        int rv;

        PERFORM(__so_recvfrom(sock, buf, len, flags, addr, addrlen))
}

int
_so_recvmsg(int sock, struct msghdr *msg, int flags)
{
        extern int __so_recvmsg(int, struct msghdr *, int);
        int rv;

        PERFORM(__so_recvmsg(sock, msg, flags))
}

int
_so_send(int sock, const void *buf, size_t len, int flags)
{
        extern int __so_send(int, const void *, size_t, int);
        int rv;

        PERFORM(__so_send(sock, buf, len, flags))
}

int
_so_sendmsg(int sock, const struct msghdr *msg, int flags)
{
        extern int __so_sendmsg(int, const struct msghdr *, int);
        int rv;

        PERFORM(__so_sendmsg(sock, msg, flags))
}

int
_so_sendto(int sock, const void *buf, size_t len, int flags,
    const struct sockaddr *addr, int *addrlen)
{
        extern int __so_sendto(int, const void *, size_t, int,
            const struct sockaddr *, int *);
        int rv;

        PERFORM(__so_sendto(sock, buf, len, flags, addr, addrlen))
}

int
tcdrain(int fildes)
{
        extern int __tcdrain(int);
        int rv;

        PERFORM(__tcdrain(fildes))
}

int
waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options)
{
        extern int __waitid(idtype_t, id_t, siginfo_t *, int);
        int rv;

        if (options & WNOHANG)
                return (__waitid(idtype, id, infop, options));
        PERFORM(__waitid(idtype, id, infop, options))
}

ssize_t
writev(int fildes, const struct iovec *iov, int iovcnt)
{
        extern ssize_t __writev(int, const struct iovec *, int);
        ssize_t rv;

        PERFORM(__writev(fildes, iov, iovcnt))
}