X-Git-Url: http://git.dolda2000.com/gitweb/?a=blobdiff_plain;f=lib%2Fmtio.c;h=b2f55f8ef6e2c9ded84dbee955617f450f0adb06;hb=e6fbc5e5b16049336cb7357d387b0f08e91fad59;hp=c861261d6c44ffa4272bbfb974087181936e666e;hpb=e1cdf02ebc900813c2395c58ee528440a9699e18;p=ashd.git
diff --git a/lib/mtio.c b/lib/mtio.c
index c861261..b2f55f8 100644
--- a/lib/mtio.c
+++ b/lib/mtio.c
@@ -16,123 +16,29 @@
along with this program. If not, see .
*/
+#ifdef HAVE_CONFIG_H
+#include
+#endif
#include
#include
-#include
#include
+#include
#include
-#include
#include
-#include
#include
-#ifdef HAVE_CONFIG_H
-#include
-#endif
#include
#include
#include
#include
-struct blocker {
- struct blocker *n, *p;
- int fd;
- int ev;
- time_t to;
- struct muth *th;
-};
-
-static struct blocker *blockers;
-
-int block(int fd, int ev, time_t to)
-{
- struct blocker *bl;
- int rv;
-
- omalloc(bl);
- bl->fd = fd;
- bl->ev = ev;
- if(to > 0)
- bl->to = time(NULL) + to;
- bl->th = current;
- bl->n = blockers;
- if(blockers)
- blockers->p = bl;
- blockers = bl;
- rv = yield();
- if(bl->n)
- bl->n->p = bl->p;
- if(bl->p)
- bl->p->n = bl->n;
- if(bl == blockers)
- blockers = bl->n;
- return(rv);
-}
-
-void ioloop(void)
-{
- int ret;
- fd_set rfds, wfds, efds;
- struct blocker *bl, *nbl;
- struct timeval toval;
- time_t now, timeout;
- int maxfd;
- int ev;
-
- while(blockers != NULL) {
- FD_ZERO(&rfds);
- FD_ZERO(&wfds);
- FD_ZERO(&efds);
- maxfd = 0;
- now = time(NULL);
- timeout = 0;
- for(bl = blockers; bl; bl = bl->n) {
- if(bl->ev & EV_READ)
- FD_SET(bl->fd, &rfds);
- if(bl->ev & EV_WRITE)
- FD_SET(bl->fd, &wfds);
- FD_SET(bl->fd, &efds);
- if(bl->fd > maxfd)
- maxfd = bl->fd;
- if((bl->to != 0) && ((timeout == 0) || (timeout > bl->to)))
- timeout = bl->to;
- }
- toval.tv_sec = timeout - now;
- toval.tv_usec = 0;
- ret = select(maxfd + 1, &rfds, &wfds, &efds, timeout?(&toval):NULL);
- if(ret < 0) {
- if(errno != EINTR) {
- flog(LOG_CRIT, "ioloop: select errored out: %s", strerror(errno));
- /* To avoid CPU hogging in case it's bad, which it
- * probably is. */
- sleep(1);
- }
- }
- now = time(NULL);
- for(bl = blockers; bl; bl = nbl) {
- nbl = bl->n;
- ev = 0;
- if(FD_ISSET(bl->fd, &rfds))
- ev |= EV_READ;
- if(FD_ISSET(bl->fd, &wfds))
- ev |= EV_WRITE;
- if(FD_ISSET(bl->fd, &efds))
- ev = -1;
- if((ev < 0) || (ev & bl->ev))
- resume(bl->th, ev);
- else if((bl->to != 0) && (bl->to <= now))
- resume(bl->th, 0);
- }
- }
-}
-
struct stdiofd {
int fd;
int sock;
int timeout;
};
-static ssize_t mtread(void *cookie, char *buf, size_t len)
+static ssize_t mtread(void *cookie, void *buf, size_t len)
{
struct stdiofd *d = cookie;
int ev;
@@ -157,7 +63,7 @@ static ssize_t mtread(void *cookie, char *buf, size_t len)
}
}
-static ssize_t mtwrite(void *cookie, const char *buf, size_t len)
+static ssize_t mtwrite(void *cookie, const void *buf, size_t len)
{
struct stdiofd *d = cookie;
int ev;
@@ -176,8 +82,6 @@ static ssize_t mtwrite(void *cookie, const char *buf, size_t len)
} else if(ev == 0) {
errno = ETIMEDOUT;
return(-1);
- } else {
- continue;
}
} else {
return(ret);
@@ -194,25 +98,135 @@ static int mtclose(void *cookie)
return(0);
}
-static cookie_io_functions_t iofuns = {
- .read = mtread,
- .write = mtwrite,
- .close = mtclose,
-};
-
FILE *mtstdopen(int fd, int issock, int timeout, char *mode)
{
struct stdiofd *d;
FILE *ret;
+ int r, w;
+ if(!strcmp(mode, "r")) {
+ r = 1; w = 0;
+ } else if(!strcmp(mode, "w")) {
+ r = 0; w = 1;
+ } else if(!strcmp(mode, "r+")) {
+ r = w = 1;
+ } else {
+ return(NULL);
+ }
omalloc(d);
d->fd = fd;
d->sock = issock;
d->timeout = timeout;
- ret = fopencookie(d, mode, iofuns);
+ ret = funstdio(d, r?mtread:NULL, w?mtwrite:NULL, NULL, mtclose);
if(!ret)
free(d);
else
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);
+}