rmtwrite
#define rmtwrite_with_restart(a, b, c) rmtwrite((a), (b), (c))
while (((r = rmtwrite(fd, buf, bsz)) < 0) && errno == EINTR)
ssize_t rmtwrite(int, const void *, size_t);
#define write rmtwrite
int rmtwrite(const char *, int);
wrote = rmtwrite(wp->tblock[0]+size,