X-Git-Url: http://www.dolda2000.com/gitweb/?a=blobdiff_plain;f=lib%2Fmtio.c;h=957cbc21b90cc1714689629e7a0f0c081005ba19;hb=2931529e223c46eb32293bd5b104a84ca4df5ac6;hp=b994cc20761aee71953e5eeb0c57db25aad9f2a5;hpb=945d02f51b66c1ca7b8ae959cd06b4f9ebbd0954;p=ashd.git

diff --git a/lib/mtio.c b/lib/mtio.c
index b994cc2..957cbc2 100644
--- a/lib/mtio.c
+++ b/lib/mtio.c
@@ -31,14 +31,9 @@
 #include <utils.h>
 #include <mt.h>
 #include <mtio.h>
+#include <bufio.h>
 
-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;
@@ -63,39 +58,30 @@ 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;
-    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)
@@ -107,29 +93,165 @@ static int mtclose(void *cookie)
     return(0);
 }
 
-#ifdef HAVE_GLIBC_STDIO
-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;
-    ret = fopencookie(d, mode, iofuns);
-    if(!ret)
+    if(!(ret = funstdio(d, r?mtread:NULL, w?mtwrite:NULL, NULL, mtclose))) {
 	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);
 }
-#else
-#error "No stdio implementation for this system"
-#endif
+
+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;
+    if(!(ret = bioopen(d, &ops))) {
+	free(d);
+	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);
+}