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Rewrite special file handling on Windows

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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
This commit is contained in:
Justine Tunney 2023-10-14 01:06:00 -07:00
parent aca2261cda
commit 2db2f40a98
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
53 changed files with 485 additions and 299 deletions
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27
libc/calls/poll-nt.c
View file

@ -58,10 +58,10 @@
// Polls on the New Technology.
//
// This function is used to implement poll() and select(). You may poll
// on both sockets and files at the same time. We also poll for signals
// while poll is polling.
textwindows int sys_poll_nt(struct pollfd *fds, uint64_t nfds, uint32_t *ms,
const sigset_t *sigmask) {
// 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;
@ -72,7 +72,6 @@ textwindows int sys_poll_nt(struct pollfd *fds, uint64_t nfds, uint32_t *ms,
struct timespec started, deadline, remain, now;
int i, rc, sn, pn, gotinvals, gotpipes, gotsocks;
BLOCK_SIGNALS;
started = timespec_real();
deadline = timespec_add(started, timespec_frommillis(ms ? *ms : -1u));
@ -128,7 +127,7 @@ textwindows int sys_poll_nt(struct pollfd *fds, uint64_t nfds, uint32_t *ms,
__fds_unlock();
if (rc) {
// failed to create a polling solution
goto Finished;
return rc;
}
// perform the i/o and sleeping and looping
@ -170,8 +169,7 @@ textwindows int sys_poll_nt(struct pollfd *fds, uint64_t nfds, uint32_t *ms,
// compute a small time slice we don't mind sleeping for
if (sn) {
if ((gotsocks = WSAPoll(sockfds, sn, 0)) == -1) {
rc = __winsockerr();
goto Finished;
return __winsockerr();
}
} else {
gotsocks = 0;
@ -190,8 +188,8 @@ textwindows int sys_poll_nt(struct pollfd *fds, uint64_t nfds, uint32_t *ms,
if (waitfor) {
POLLTRACE("poll() sleeping for %'d out of %'lu ms", waitfor,
timespec_tomillis(remain));
if ((rc = _park_norestart(waitfor, sigmask ? *sigmask : 0)) == -1) {
goto Finished; // eintr, ecanceled, etc.
if ((rc = _park_norestart(waitfor, sigmask)) == -1) {
return -1; // eintr, ecanceled, etc.
}
}
}
@ -221,9 +219,14 @@ textwindows int sys_poll_nt(struct pollfd *fds, uint64_t nfds, uint32_t *ms,
}
// and finally return
rc = gotinvals + gotpipes + gotsocks;
return gotinvals + gotpipes + gotsocks;
}
Finished:
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;
}