{
struct stdiofd *d = cookie;
int ev;
- size_t off;
ssize_t ret;
- off = 0;
- while(off < len) {
+ while(1) {
if(d->sock)
- ret = send(d->fd, buf + off, len - off, MSG_DONTWAIT | MSG_NOSIGNAL);
+ ret = send(d->fd, buf, len, MSG_DONTWAIT | MSG_NOSIGNAL);
else
- ret = write(d->fd, buf + off, len - off);
- if(ret < 0) {
- if(errno == EAGAIN) {
- ev = block(d->fd, EV_WRITE, d->timeout);
- if(ev < 0) {
- /* If we just go on, we should get the real error. */
- continue;
- } else if(ev == 0) {
- errno = ETIMEDOUT;
- return(off);
- } else {
- continue;
- }
- } else {
- return(off);
+ ret = write(d->fd, buf, len);
+ if((ret < 0) && (errno == EAGAIN)) {
+ ev = block(d->fd, EV_WRITE, d->timeout);
+ if(ev < 0) {
+ /* If we just go on, we should get the real error. */
+ continue;
+ } else if(ev == 0) {
+ errno = ETIMEDOUT;
+ return(-1);
}
} else {
- off += ret;
+ return(ret);
}
}
- return(off);
}
static int mtclose(void *cookie)
fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
return(ret);
}
+
+struct pipe {
+ struct charbuf data;
+ size_t bufmax;
+ int closed;
+ struct muth *r, *w;
+};
+
+static void freepipe(struct pipe *p)
+{
+ buffree(p->data);
+ free(p);
+}
+
+static ssize_t piperead(void *pdata, void *buf, size_t len)
+{
+ struct pipe *p = pdata;
+ ssize_t ret;
+
+ while(p->data.d == 0) {
+ if(p->closed & 2)
+ return(0);
+ if(p->r) {
+ errno = EBUSY;
+ return(-1);
+ }
+ p->r = current;
+ yield();
+ p->r = NULL;
+ }
+ ret = min(len, p->data.d);
+ memcpy(buf, p->data.b, ret);
+ memmove(p->data.b, p->data.b + ret, p->data.d -= ret);
+ if(p->w)
+ resume(p->w, 0);
+ return(ret);
+}
+
+static int piperclose(void *pdata)
+{
+ struct pipe *p = pdata;
+
+ if(p->closed & 2) {
+ freepipe(p);
+ } else {
+ p->closed |= 1;
+ if(p->w)
+ resume(p->w, 0);
+ }
+ return(0);
+}
+
+static ssize_t pipewrite(void *pdata, const void *buf, size_t len)
+{
+ struct pipe *p = pdata;
+ ssize_t ret;
+
+ if(p->closed & 1) {
+ errno = EPIPE;
+ return(-1);
+ }
+ while(p->data.d >= p->bufmax) {
+ if(p->w) {
+ errno = EBUSY;
+ return(-1);
+ }
+ p->w = current;
+ yield();
+ p->w = NULL;
+ if(p->closed & 1) {
+ errno = EPIPE;
+ return(-1);
+ }
+ }
+ ret = min(len, p->bufmax - p->data.d);
+ sizebuf(p->data, p->data.d + ret);
+ memcpy(p->data.b + p->data.d, buf, ret);
+ p->data.d += ret;
+ if(p->r)
+ resume(p->r, 0);
+ return(ret);
+}
+
+static int pipewclose(void *pdata)
+{
+ struct pipe *p = pdata;
+
+ if(p->closed & 1) {
+ freepipe(p);
+ } else {
+ p->closed |= 2;
+ if(p->r)
+ resume(p->r, 0);
+ }
+ return(0);
+}
+
+void mtiopipe(FILE **read, FILE **write)
+{
+ struct pipe *p;
+
+ omalloc(p);
+ p->bufmax = 4096;
+ *read = funstdio(p, piperead, NULL, NULL, piperclose);
+ *write = funstdio(p, NULL, pipewrite, NULL, pipewclose);
+}