mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
d1d4388201
It hasn't been helpful enough to be justify the maintenance burden. What actually does help is mprotect(), kprintf(), --ftrace and --strace which can always be counted upon to work correctly. We aren't losing much with this change. Support for ASAN on AARCH64 was never implemented. Applying ASAN to the core libc runtimes was disabled many months ago. If there is some way to have an ASAN runtime for user programs that is less invasive we can potentially consider reintroducing support. But now is premature.
128 lines
5 KiB
C
128 lines
5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2022 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/calls/cp.internal.h"
|
|
#include "libc/calls/struct/itimerval.internal.h"
|
|
#include "libc/calls/struct/sigset.internal.h"
|
|
#include "libc/calls/struct/timespec.h"
|
|
#include "libc/calls/struct/timespec.internal.h"
|
|
#include "libc/calls/struct/timeval.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/intrin/describeflags.internal.h"
|
|
#include "libc/intrin/strace.internal.h"
|
|
#include "libc/sock/internal.h"
|
|
#include "libc/sock/select.h"
|
|
#include "libc/sock/select.internal.h"
|
|
#include "libc/sysv/consts/nrlinux.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
/**
|
|
* Does what poll() does except with bitset API.
|
|
*
|
|
* This function is the same as saying:
|
|
*
|
|
* sigset_t old;
|
|
* sigprocmask(SIG_SETMASK, sigmask, &old);
|
|
* select(nfds, readfds, writefds, exceptfds, timeout);
|
|
* sigprocmask(SIG_SETMASK, old, 0);
|
|
*
|
|
* Except it happens atomically.
|
|
*
|
|
* The Linux Kernel modifies the timeout parameter. This wrapper gives
|
|
* it a local variable due to POSIX requiring that `timeout` be const.
|
|
* If you need that information from the Linux Kernel use sys_pselect.
|
|
*
|
|
* This system call is supported on all platforms. It's like select()
|
|
* except that it atomically changes the sigprocmask() during the op.
|
|
*
|
|
* @raise ECANCELED if thread was cancelled in masked mode
|
|
* @raise EINTR if signal was delivered
|
|
* @cancelationpoint
|
|
* @asyncsignalsafe
|
|
* @norestart
|
|
*/
|
|
int pselect(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
|
|
const struct timespec *timeout, const sigset_t *sigmask) {
|
|
int rc;
|
|
struct timeval tv, *tvp;
|
|
struct timespec ts, *tsp;
|
|
struct {
|
|
const sigset_t *s;
|
|
size_t n;
|
|
} ss;
|
|
|
|
fd_set old_readfds;
|
|
fd_set *old_readfds_ptr = 0;
|
|
fd_set old_writefds;
|
|
fd_set *old_writefds_ptr = 0;
|
|
fd_set old_exceptfds;
|
|
fd_set *old_exceptfds_ptr = 0;
|
|
|
|
BEGIN_CANCELATION_POINT;
|
|
if (nfds < 0) {
|
|
rc = einval();
|
|
} else {
|
|
if (readfds) {
|
|
old_readfds = *readfds;
|
|
old_readfds_ptr = &old_readfds;
|
|
}
|
|
if (writefds) {
|
|
old_writefds = *writefds;
|
|
old_writefds_ptr = &old_writefds;
|
|
}
|
|
if (exceptfds) {
|
|
old_exceptfds = *exceptfds;
|
|
old_exceptfds_ptr = &old_exceptfds;
|
|
}
|
|
if (IsLinux()) {
|
|
if (timeout) {
|
|
ts = *timeout;
|
|
tsp = &ts;
|
|
} else {
|
|
tsp = 0;
|
|
}
|
|
ss.s = sigmask;
|
|
ss.n = 8;
|
|
rc = sys_pselect(nfds, readfds, writefds, exceptfds, tsp, &ss);
|
|
} else if (!IsWindows()) {
|
|
rc = sys_pselect(nfds, readfds, writefds, exceptfds,
|
|
(struct timespec *)timeout, sigmask);
|
|
} else {
|
|
if (timeout) {
|
|
tv.tv_sec = timeout->tv_sec;
|
|
tv.tv_usec = timeout->tv_nsec / 1000;
|
|
tvp = &tv;
|
|
} else {
|
|
tvp = 0;
|
|
}
|
|
rc = sys_select_nt(nfds, readfds, writefds, exceptfds, tvp, sigmask);
|
|
}
|
|
}
|
|
END_CANCELATION_POINT;
|
|
|
|
STRACE("pselect(%d, %s → [%s], %s → [%s], %s → [%s], %s, %s) → %d% m", nfds,
|
|
DescribeFdSet(rc, nfds, old_readfds_ptr),
|
|
DescribeFdSet(rc, nfds, readfds),
|
|
DescribeFdSet(rc, nfds, old_writefds_ptr),
|
|
DescribeFdSet(rc, nfds, writefds),
|
|
DescribeFdSet(rc, nfds, old_exceptfds_ptr),
|
|
DescribeFdSet(rc, nfds, exceptfds), //
|
|
DescribeTimespec(0, timeout), //
|
|
DescribeSigset(0, sigmask), rc);
|
|
return rc;
|
|
}
|