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Make more Windows socket fixes and improvements

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This change makes send() / sendto() always block on Windows. It's needed
because poll(POLLOUT) doesn't guarantee a socket is immediately writable
on Windows, and it caused rsync to fail because it made that assumption.
The only exception is when a SO_SNDTIMEO is specified which will EAGAIN.

Tests are added confirming MSG_WAITALL and MSG_NOSIGNAL work as expected
on all our supported OSes. Most of the platform-specific MSG_FOO magnums
have been deleted, with the exception of MSG_FASTOPEN. Your --strace log
will now show MSG_FOO flags as symbols rather than numbers.

I've also removed cv_wait_example_test because it's 0.3% flaky with Qemu
under system load since it depends on a process being readily scheduled.
This commit is contained in:
Justine Tunney 2024-09-18 19:54:56 -07:00
parent ce2fbf9325
commit 87a6669900
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GPG key ID: BE714B4575D6E328
41 changed files with 584 additions and 184 deletions
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5
libc/sock/send.c
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@ -21,6 +21,7 @@
#include "libc/calls/struct/iovec.h"
#include "libc/calls/struct/iovec.internal.h"
#include "libc/dce.h"
#include "libc/intrin/describeflags.h"
#include "libc/intrin/strace.h"
#include "libc/macros.h"
#include "libc/sock/internal.h"
@ -78,7 +79,7 @@ ssize_t send(int fd, const void *buf, size_t size, int flags) {
}
END_CANCELATION_POINT;
DATATRACE("send(%d, %#.*hhs%s, %'zu, %#x) → %'ld% lm", fd,
MAX(0, MIN(40, rc)), buf, rc > 40 ? "..." : "", size, flags, rc);
DATATRACE("send(%d, %#.*hhs%s, %'zu, %s) → %'ld% lm", fd, MAX(0, MIN(40, rc)),
buf, rc > 40 ? "..." : "", size, DescribeMsg(flags), rc);
return rc;
}