mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
2db2f40a98
This change gets GNU grep working. What caused it to not work, is it wouldn't write to an output file descriptor when its dev/ino equaled /dev/null's. So now we invent special dev/ino values for these files
234 lines
8.7 KiB
C
234 lines
8.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 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/assert.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/calls/sig.internal.h"
|
|
#include "libc/calls/state.internal.h"
|
|
#include "libc/calls/struct/sigaction.h"
|
|
#include "libc/calls/struct/sigset.internal.h"
|
|
#include "libc/calls/struct/timespec.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/intrin/atomic.h"
|
|
#include "libc/intrin/bits.h"
|
|
#include "libc/intrin/strace.internal.h"
|
|
#include "libc/macros.internal.h"
|
|
#include "libc/mem/mem.h"
|
|
#include "libc/nt/console.h"
|
|
#include "libc/nt/enum/filetype.h"
|
|
#include "libc/nt/errors.h"
|
|
#include "libc/nt/files.h"
|
|
#include "libc/nt/ipc.h"
|
|
#include "libc/nt/runtime.h"
|
|
#include "libc/nt/struct/pollfd.h"
|
|
#include "libc/nt/synchronization.h"
|
|
#include "libc/nt/thread.h"
|
|
#include "libc/nt/thunk/msabi.h"
|
|
#include "libc/nt/winsock.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/sock/internal.h"
|
|
#include "libc/sock/struct/pollfd.h"
|
|
#include "libc/sock/struct/pollfd.internal.h"
|
|
#include "libc/stdio/sysparam.h"
|
|
#include "libc/sysv/consts/o.h"
|
|
#include "libc/sysv/consts/poll.h"
|
|
#include "libc/sysv/consts/sig.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
#include "libc/thread/posixthread.internal.h"
|
|
#include "libc/thread/tls.h"
|
|
#ifdef __x86_64__
|
|
|
|
// Polls on the New Technology.
|
|
//
|
|
// This function is used to implement poll() and select(). You may poll
|
|
// on sockets, files and the console at the same time. We also poll for
|
|
// both signals and posix thread cancelation, while the poll is polling
|
|
static textwindows int sys_poll_nt_impl(struct pollfd *fds, uint64_t nfds,
|
|
uint32_t *ms, sigset_t sigmask) {
|
|
bool ok;
|
|
uint64_t millis;
|
|
uint32_t cm, avail, waitfor;
|
|
struct sys_pollfd_nt pipefds[8];
|
|
struct sys_pollfd_nt sockfds[64];
|
|
int pipeindices[ARRAYLEN(pipefds)];
|
|
int sockindices[ARRAYLEN(sockfds)];
|
|
struct timespec started, deadline, remain, now;
|
|
int i, rc, sn, pn, gotinvals, gotpipes, gotsocks;
|
|
|
|
started = timespec_real();
|
|
deadline = timespec_add(started, timespec_frommillis(ms ? *ms : -1u));
|
|
|
|
// do the planning
|
|
// we need to read static variables
|
|
// we might need to spawn threads and open pipes
|
|
__fds_lock();
|
|
for (gotinvals = rc = sn = pn = i = 0; i < nfds; ++i) {
|
|
if (fds[i].fd < 0) continue;
|
|
if (__isfdopen(fds[i].fd)) {
|
|
if (__isfdkind(fds[i].fd, kFdSocket)) {
|
|
if (sn < ARRAYLEN(sockfds)) {
|
|
// the magnums for POLLIN/OUT/PRI on NT include the other ones too
|
|
// we need to clear ones like POLLNVAL or else WSAPoll shall whine
|
|
sockindices[sn] = i;
|
|
sockfds[sn].handle = g_fds.p[fds[i].fd].handle;
|
|
sockfds[sn].events = fds[i].events & (POLLPRI | POLLIN | POLLOUT);
|
|
sockfds[sn].revents = 0;
|
|
++sn;
|
|
} else {
|
|
// too many socket fds
|
|
rc = enomem();
|
|
break;
|
|
}
|
|
} else if (pn < ARRAYLEN(pipefds)) {
|
|
pipeindices[pn] = i;
|
|
pipefds[pn].handle = g_fds.p[fds[i].fd].handle;
|
|
pipefds[pn].events = 0;
|
|
pipefds[pn].revents = 0;
|
|
switch (g_fds.p[fds[i].fd].flags & O_ACCMODE) {
|
|
case O_RDONLY:
|
|
pipefds[pn].events = fds[i].events & POLLIN;
|
|
break;
|
|
case O_WRONLY:
|
|
pipefds[pn].events = fds[i].events & POLLOUT;
|
|
break;
|
|
case O_RDWR:
|
|
pipefds[pn].events = fds[i].events & (POLLIN | POLLOUT);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
++pn;
|
|
} else {
|
|
// too many non-socket fds
|
|
rc = enomem();
|
|
break;
|
|
}
|
|
} else {
|
|
++gotinvals;
|
|
}
|
|
}
|
|
__fds_unlock();
|
|
if (rc) {
|
|
// failed to create a polling solution
|
|
return rc;
|
|
}
|
|
|
|
// perform the i/o and sleeping and looping
|
|
for (;;) {
|
|
// see if input is available on non-sockets
|
|
for (gotpipes = i = 0; i < pn; ++i) {
|
|
if (pipefds[i].events & POLLOUT) {
|
|
// we have no way of polling if a non-socket is writeable yet
|
|
// therefore we assume that if it can happen, it shall happen
|
|
pipefds[i].revents |= POLLOUT;
|
|
}
|
|
if (pipefds[i].events & POLLIN) {
|
|
if (GetFileType(pipefds[i].handle) == kNtFileTypePipe) {
|
|
ok = PeekNamedPipe(pipefds[i].handle, 0, 0, 0, &avail, 0);
|
|
POLLTRACE("PeekNamedPipe(%ld, 0, 0, 0, [%'u], 0) → %hhhd% m",
|
|
pipefds[i].handle, avail, ok);
|
|
if (ok) {
|
|
if (avail) {
|
|
pipefds[i].revents |= POLLIN;
|
|
}
|
|
} else {
|
|
pipefds[i].revents |= POLLERR;
|
|
}
|
|
} else if (GetConsoleMode(pipefds[i].handle, &cm)) {
|
|
if (CountConsoleInputBytes()) {
|
|
pipefds[i].revents |= POLLIN; // both >0 and -1 (eof) are pollin
|
|
}
|
|
} else {
|
|
// we have no way of polling if a non-socket is readable yet
|
|
// therefore we assume that if it can happen it shall happen
|
|
pipefds[i].revents |= POLLIN;
|
|
}
|
|
}
|
|
if (pipefds[i].revents) {
|
|
++gotpipes;
|
|
}
|
|
}
|
|
// if we haven't found any good results yet then here we
|
|
// compute a small time slice we don't mind sleeping for
|
|
if (sn) {
|
|
if ((gotsocks = WSAPoll(sockfds, sn, 0)) == -1) {
|
|
return __winsockerr();
|
|
}
|
|
} else {
|
|
gotsocks = 0;
|
|
}
|
|
|
|
// add some artificial delay, which we use as an opportunity to also
|
|
// check for pending signals, thread cancelation, etc.
|
|
waitfor = 0;
|
|
if (!gotinvals && !gotsocks && !gotpipes) {
|
|
now = timespec_real();
|
|
if (timespec_cmp(now, deadline) < 0) {
|
|
remain = timespec_sub(deadline, now);
|
|
millis = timespec_tomillis(remain);
|
|
waitfor = MIN(millis, 0xffffffffu);
|
|
waitfor = MIN(waitfor, __SIG_POLL_INTERVAL_MS);
|
|
if (waitfor) {
|
|
POLLTRACE("poll() sleeping for %'d out of %'lu ms", waitfor,
|
|
timespec_tomillis(remain));
|
|
if ((rc = _park_norestart(waitfor, sigmask)) == -1) {
|
|
return -1; // eintr, ecanceled, etc.
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// we gave all the sockets and all the named pipes a shot
|
|
// if we found anything at all then it's time to end work
|
|
if (gotinvals || gotpipes || gotsocks || !waitfor) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// the system call is going to succeed
|
|
// it's now ok to start setting the output memory
|
|
for (i = 0; i < nfds; ++i) {
|
|
if (fds[i].fd < 0 || __isfdopen(fds[i].fd)) {
|
|
fds[i].revents = 0;
|
|
} else {
|
|
fds[i].revents = POLLNVAL;
|
|
}
|
|
}
|
|
for (i = 0; i < pn; ++i) {
|
|
fds[pipeindices[i]].revents = pipefds[i].revents;
|
|
}
|
|
for (i = 0; i < sn; ++i) {
|
|
fds[sockindices[i]].revents = sockfds[i].revents;
|
|
}
|
|
|
|
// and finally return
|
|
return gotinvals + gotpipes + gotsocks;
|
|
}
|
|
|
|
textwindows int sys_poll_nt(struct pollfd *fds, uint64_t nfds, uint32_t *ms,
|
|
const sigset_t *sigmask) {
|
|
int rc;
|
|
BLOCK_SIGNALS;
|
|
rc = sys_poll_nt_impl(fds, nfds, ms, sigmask ? *sigmask : 0);
|
|
ALLOW_SIGNALS;
|
|
return rc;
|
|
}
|
|
|
|
#endif /* __x86_64__ */
|