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/* Simulates MSG_DONTWAIT using fcntl() and O_NONBLOCK. */
static void fd_modify(int fd, int flags, int add, int shouldRemove)
{
int status;
if (flags & MSG_DONTWAIT) {
status = errno;
int f = fcntl(fd, F_GETFL);
fcntl(fd, F_SETFL, (f | add) & ~shouldRemove);
errno = status;
}
}
static void set_nonblock(int fd, int flags)
{
fd_modify(fd, flags, O_NONBLOCK, 0);
}
static void clear_nonblock(int fd, int flags)
{
fd_modify(fd, flags, 0, O_NONBLOCK);
}
int MLton_recv(int s, void *buf, int len, int flags)
{
int ret;
set_nonblock(s, flags);
ret = recv(s, buf, len, flags & ~MSG_DONTWAIT);
clear_nonblock(s, flags);
return ret;
}
int MLton_recvfrom(int s, void *buf, int len, int flags, void *from,
socklen_t *fromlen)
{
int ret;
set_nonblock(s, flags);
ret = recvfrom(s, buf, len, flags & ~MSG_DONTWAIT, from, fromlen);
clear_nonblock(s, flags);
return ret;
}
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