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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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11
libc/sock/recvfrom-nt.c
View file

@ -59,14 +59,13 @@ textwindows ssize_t sys_recvfrom_nt(int fd, const struct iovec *iov,
return einval();
ssize_t rc;
struct Fd *f = g_fds.p + fd;
sigset_t m = __sig_block();
bool nonblock = (f->flags & O_NONBLOCK) || (flags & _MSG_DONTWAIT);
flags &= ~_MSG_DONTWAIT;
rc = __winsock_block(f->handle, flags, nonblock, f->rcvtimeo, m,
sys_recvfrom_nt_start,
sigset_t waitmask = __sig_block();
rc = __winsock_block(f->handle, flags & ~_MSG_DONTWAIT,
(f->flags & O_NONBLOCK) || (flags & _MSG_DONTWAIT),
f->rcvtimeo, waitmask, sys_recvfrom_nt_start,
&(struct RecvFromArgs){iov, iovlen, opt_out_srcaddr,
opt_inout_srcaddrsize});
__sig_unblock(m);
__sig_unblock(waitmask);
return rc;
}