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Make send() block in non-blocking mode

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Justine Tunney 2024-09-16 21:09:28 -07:00
parent 3c58ecd00c
commit 774c67fcd3
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GPG key ID: BE714B4575D6E328
2 changed files with 20 additions and 1 deletions
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9
libc/sock/send-nt.c
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@ -54,7 +54,14 @@ textwindows ssize_t sys_send_nt(int fd, const struct iovec *iov, size_t iovlen,
ssize_t rc;
struct Fd *f = g_fds.p + fd;
sigset_t m = __sig_block();
bool nonblock = (f->flags & O_NONBLOCK) || (flags & _MSG_DONTWAIT);
// we don't check O_NONBLOCK because we want to avoid needing to call
// WSAPoll() every time we write() to a non-blocking socket. WIN32 is
// unsafe at canceling socket sends. lots of code doesn't check write
// return status. good programs that sincerely want to avoid blocking
// on send() operations should have already called poll() beforehand.
bool nonblock = flags & _MSG_DONTWAIT;
flags &= ~_MSG_DONTWAIT;
rc = __winsock_block(f->handle, flags, -nonblock, f->sndtimeo, m,
sys_send_nt_start, &(struct SendArgs){iov, iovlen});