X-Git-Url: http://www.dolda2000.com/gitweb/?a=blobdiff_plain;f=lib%2Fmtio.c;h=b911f72fd2e0d59e160b4a705f6ae5cb144ed7b3;hb=595adb9922885c2a05bc6917ee8f8f02f496e618;hp=4211996eb698b2e69ba1c9d82f387d61e73c3515;hpb=96fc434adc5dde46b139d93cbdf13ce366c4d53c;p=ashd.git

diff --git a/lib/mtio.c b/lib/mtio.c
index 4211996..b911f72 100644
--- a/lib/mtio.c
+++ b/lib/mtio.c
@@ -16,131 +16,68 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
 #include <stdlib.h>
 #include <stdio.h>
-#include <fcntl.h>
 #include <unistd.h>
+#include <fcntl.h>
 #include <string.h>
-#include <time.h>
 #include <errno.h>
-#include <sys/select.h>
 #include <sys/socket.h>
 
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
 #include <log.h>
 #include <utils.h>
 #include <mt.h>
 #include <mtio.h>
+#include <bufio.h>
 
-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)
+static ssize_t mtrecv(struct stdiofd *d, void *buf, size_t len)
 {
-    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;
-    free(bl);
-    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;
+    struct msghdr msg;
+    char cbuf[512];
+    struct cmsghdr *cmsg;
+    struct iovec bufvec;
+    socklen_t clen;
+    ssize_t ret;
+    int i, *fds;
     
-    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);
+    msg = (struct msghdr){};
+    msg.msg_iov = &bufvec;
+    msg.msg_iovlen = 1;
+    bufvec.iov_base = buf;
+    bufvec.iov_len = len;
+    msg.msg_control = cbuf;
+    msg.msg_controllen = sizeof(cbuf);
+    if((ret = recvmsg(d->fd, &msg, MSG_DONTWAIT)) < 0)
+	return(ret);
+    for(cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
+	if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_RIGHTS)) {
+	    fds = (int *)CMSG_DATA(cmsg);
+	    clen = (cmsg->cmsg_len - ((char *)fds - (char *)cmsg)) / sizeof(*fds);
+	    for(i = 0; i < clen; i++) {
+		if(d->rights < 0)
+		    d->rights = fds[i];
+		else
+		    close(fds[i]);
 	    }
 	}
-	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);
-	}
     }
+    return(ret);
 }
 
-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;
     ssize_t ret;
     
     while(1) {
-	ret = read(d->fd, buf, len);
+	if(d->sock)
+	    ret = mtrecv(d, buf, len);
+	else
+	    ret = read(d->fd, buf, len);
 	if((ret < 0) && (errno == EAGAIN)) {
 	    ev = block(d->fd, EV_READ, d->timeout);
 	    if(ev < 0) {
@@ -158,39 +95,63 @@ 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 mtsend(struct stdiofd *d, const void *buf, size_t len)
+{
+    struct msghdr msg;
+    struct cmsghdr *cmsg;
+    char cbuf[CMSG_SPACE(sizeof(int))];
+    struct iovec bufvec;
+    ssize_t ret;
+    int cr;
+    
+    msg = (struct msghdr){};
+    msg.msg_iov = &bufvec;
+    msg.msg_iovlen = 1;
+    bufvec.iov_base = (void *)buf;
+    bufvec.iov_len = len;
+    cr = -1;
+    if(d->sendrights >= 0) {
+	msg.msg_control = cbuf;
+	msg.msg_controllen = sizeof(cbuf);
+	cmsg = CMSG_FIRSTHDR(&msg);
+	cmsg->cmsg_level = SOL_SOCKET;
+	cmsg->cmsg_type = SCM_RIGHTS;
+	cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+	*((int *)CMSG_DATA(cmsg)) = d->sendrights;
+	cr = d->sendrights;
+	d->sendrights = -1;
+	msg.msg_controllen = cmsg->cmsg_len;
+    }
+    ret = sendmsg(d->fd, &msg, MSG_DONTWAIT | MSG_NOSIGNAL);
+    if(cr >= 0)
+	close(cr);
+    return(ret);
+}
+
+static ssize_t mtwrite(void *cookie, const void *buf, size_t len)
 {
     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 = mtsend(d, buf, len);
 	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)
@@ -198,29 +159,175 @@ static int mtclose(void *cookie)
     struct stdiofd *d = cookie;
     
     close(d->fd);
+    if(d->rights >= 0)
+	close(d->rights);
+    if(d->sendrights >= 0)
+	close(d->sendrights);
     free(d);
     return(0);
 }
 
-static cookie_io_functions_t iofuns = {
-    .read = mtread,
-    .write = mtwrite,
-    .close = mtclose,
-};
-
-FILE *mtstdopen(int fd, int issock, int timeout, char *mode)
+FILE *mtstdopen(int fd, int issock, int timeout, char *mode, struct stdiofd **infop)
 {
     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;
+    d->rights = d->sendrights = -1;
+    if(!(ret = funstdio(d, r?mtread:NULL, w?mtwrite:NULL, NULL, mtclose))) {
+	free(d);
+	return(NULL);
+    }
+    fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
+    if(infop)
+	*infop = d;
+    return(ret);
+}
+
+struct bufio *mtbioopen(int fd, int issock, int timeout, char *mode, struct stdiofd **infop)
+{
+    static struct bufioops ops = {
+	.read = mtread, .write = mtwrite, .close = mtclose,
+    };
+    struct stdiofd *d;
+    struct bufio *ret;
     
+    if(!strcmp(mode, "r")) {
+    } else if(!strcmp(mode, "w")) {
+    } else if(!strcmp(mode, "r+")) {
+    } else {
+	return(NULL);
+    }
     omalloc(d);
     d->fd = fd;
     d->sock = issock;
     d->timeout = timeout;
-    ret = fopencookie(d, mode, iofuns);
-    if(!ret)
+    d->rights = d->sendrights = -1;
+    if(!(ret = bioopen(d, &ops))) {
 	free(d);
-    else
-	fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
+	return(NULL);
+    }
+    fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
+    if(infop)
+	*infop = d;
     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);
+}