Attempted to add epoll, but getting segfault

Jason Kridner · Jason Kridner · commit 84d8d4fb2f2c · 2012-05-04T03:26:13.000+01:00
Test:
cd bonescript
node-waf configure build &amp;&amp; node misctest.js
diff --git a/.settings.xml b/.settings.xml
@@ -1,4 +1,4 @@
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+<settings version="0.0.4"   ><auto><configurations debug="0"   ><config path="blinkled.js" name="blinkled" extension="js" args=""  /><config path="bone101.js" name="bone101" extension="js" args="" /><config path="footest.js" name="footest" extension="" args=""  /><config path="input.js" name="input" extension="" args="" /></configurations><panel>{"ext/editors/editors":{"parent":{"visible":2,"flex":1},"visible":2,"flex":1},"ext/tree/tree":{"parent":{"visible":true,"width":"200"},"visible":true,"flex":1,"state":"normal"},"ext/console/console":{"parent":{"visible":2,"height":200},"visible":true,"flex":1},"ext/settings/settings":{"parent":{"visible":true,"width":"200"},"visible":false,"flex":1,"state":"normal"},"ext/openfiles/openfiles":{"parent":{"visible":true,"width":"200"},"visible":false,"flex":1,"state":"normal"}}</panel><tree_selection path="/workspace/bonescript/misctest.js" type="file"/><tree>["folder[1]","folder[1]/folder[2]"]</tree><console><input>this.subdir
 
 
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+</input></console><customtypes/><zen>0.7</zen><recentfiles>[{"caption":"misc.cpp","value":"/workspace/bonescript/misc.cpp"},{"caption":"misctest.js","value":"/workspace/bonescript/misctest.js"},{"caption":"footest.js","value":"/workspace/footest.js"},{"caption":"input.js","value":"/workspace/input.js"},{"caption":"index.js","value":"/workspace/bonescript/index.js"},{"caption":"epolltest.c","value":"/workspace/epolltest.c"},{"caption":"blinkled.js","value":"/workspace/blinkled.js"},{"caption":"polltest.c","value":"/workspace/polltest.c"},{"caption":"wscript","value":"/workspace/bonescript/wscript"},{"caption":"LICENSE","value":"/workspace/LICENSE"}]</recentfiles><extensions/><files active="/workspace/bonescript/misc.cpp"><file path="/workspace/bonescript/index.js" type="file" size="19586" name="index.js" contenttype="application/javascript; charset=utf-8" modifieddate="Fri, 04 May 2012 02:29:54 +0100" creationdate="" lockable="false" hidden="false" executable="false" scriptname="/var/lib/cloud9/bonescript/index.js"/><file path="/workspace/input.js" type="file" size="745" name="input.js" contenttype="application/javascript; charset=utf-8" modifieddate="Fri, 04 May 2012 02:29:54 +0100" creationdate="" lockable="false" hidden="false" executable="false" scriptname="/var/lib/cloud9/input.js" state="{&quot;scrolltop&quot;:775,&quot;scrollleft&quot;:0,&quot;selection&quot;:{&quot;start&quot;:{&quot;row&quot;:0,&quot;column&quot;:0},&quot;end&quot;:{&quot;row&quot;:0,&quot;column&quot;:0}}}"/><file path="/workspace/blinkled.js" type="file" size="364" name="blinkled.js" contenttype="application/javascript; charset=utf-8" modifieddate="Fri, 04 May 2012 02:29:54 +0100" creationdate="" lockable="false" hidden="false" executable="false" scriptname="/var/lib/cloud9/blinkled.js"/><file path="/workspace/bonescript/misc.cpp" type="file" size="1372" name="misc.cpp" contenttype="text/x-c; charset=utf-8" modifieddate="Fri, 04 May 2012 03:22:37 +0100" creationdate="" lockable="false" hidden="false" executable="false" scriptname="/var/lib/cloud9/bonescript/misc.cpp" changed="1" state="{&quot;scrolltop&quot;:775,&quot;scrollleft&quot;:0,&quot;selection&quot;:{&quot;start&quot;:{&quot;row&quot;:71,&quot;column&quot;:11},&quot;end&quot;:{&quot;row&quot;:71,&quot;column&quot;:11}}}"/><file path="/workspace/epolltest.c" type="file" size="1012" name="epolltest.c" contenttype="text/x-c; charset=utf-8" modifieddate="Fri, 04 May 2012 02:29:54 +0100" creationdate="" lockable="false" hidden="false" executable="false" scriptname="/var/lib/cloud9/epolltest.c" state="{&quot;scrolltop&quot;:775,&quot;scrollleft&quot;:0,&quot;selection&quot;:{&quot;start&quot;:{&quot;row&quot;:20,&quot;column&quot;:20},&quot;end&quot;:{&quot;row&quot;:20,&quot;column&quot;:20}}}"/><file type="file" name="misctest.js" path="/workspace/bonescript/misctest.js" scriptname="/var/lib/cloud9/bonescript/misctest.js" changed="0" modifieddate="Fri, 04 May 2012 03:04:13 +0100" state="{&quot;scrolltop&quot;:775,&quot;scrollleft&quot;:0,&quot;selection&quot;:{&quot;start&quot;:{&quot;row&quot;:3,&quot;column&quot;:42},&quot;end&quot;:{&quot;row&quot;:3,&quot;column&quot;:42}}}"/></files></auto><general name="General" saveallbeforerun="true" openfiles="true"/><beautify name="Beautify"><jsbeautify name="JS Beautify" preserveemptylines="true" keeparrayindentation="false" braces="end-expand"/></beautify><editors name="Editor"><code name="Code Editor" overwrite="false" selectstyle="line" activeline="true" showinvisibles="false" showprintmargin="true" printmargincolumn="80" softtabs="true" tabsize="4" scrollspeed="2" fontsize="12" wrapmode="false" wraplimitmin="" wraplimitmax="" gutter="true" highlightselectedword="true" autohidehorscrollbar="true"/></editors><search><word key="attachInterrupt"/><word key="rx"/><word key="analogRead"/><word key="digitalWrite"/><word key="HIGH"/><word key="output"/><word key="socket"/><word key="readFile"/><word key="pinmode"/><word key="eeproms"/><word key="eeprom"/><word key="eeproms"/><word key="socket.emit"/><word key="muxOption"/><word key="ex"/><word key="export"/><word key="getpinmode"/><word key="omap_mux"/><word key="readout"/><word key="omap_mux"/><word key="muxstruct"/><word key="socket.emit"/><word key="mode"/><word key="socket"/><word key="spawn"/><word key="socket.on"/><word key="fibers"/><word key="pinObject"/><word key="pull"/><word key="pinmode"/><word key="events"/><word key="gpmc_ben1"/><word key="opensync"/></search><breakpoints   /></settings>
diff --git a/bonescript/misc.cpp b/bonescript/misc.cpp
@@ -6,14 +6,17 @@
 #include <fcntl.h>
 #include <sys/epoll.h>
 #include <sys/types.h>
+#include <stdio.h>
+#include <errno.h>
 
 using namespace std;
 using namespace node;
 using namespace v8;
 
 static Handle<Value> PollpriAsync(const Arguments&);
 static int Pollpri(eio_req *);
-static int PollpriAfter(eio_req *);
+//static int PollpriAfter(eio_req *);
+static void PollpriAfter(ev_io* req, int revents);
 extern "C" void init(Handle<Object>);
 
 struct pollpri_request {
@@ -36,26 +39,45 @@ static Handle<Value> PollpriAsync(const Arguments& args) {
     pr->cb = Persistent<Function>::New(cb);
     strncpy(pr->path, *path, path.length() + 1);
     
-    eio_custom(Pollpri, EIO_PRI_DEFAULT, PollpriAfter, pr);
-    ev_ref(EV_DEFAULT_UC);
+    int epfd = epoll_create(1);
+    int fd = open(pr->path, O_RDWR | O_NONBLOCK);
+    printf("open(%s) returned %d: %s\n", pr->path, fd, strerror(errno));
+    struct epoll_event ev;
+    struct epoll_event events;
+    ev.events = EPOLLPRI;
+    ev.data.fd = fd;
+    int n = epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &ev);
+    printf("epoll_ctl(%d) returned %d (%d): %s\n", fd, n, epfd, strerror(errno));
+    ev_io pollpri_watcher;
+    ev_init(&pollpri_watcher, PollpriAfter);
+    pollpri_watcher.data = pr;
+    ev_io_set(&pollpri_watcher, epfd, EV_READ);
+    ev_io_start(EV_DEFAULT_ &pollpri_watcher);
+
+    //eio_custom(Pollpri, EIO_PRI_DEFAULT, PollpriAfter, pr);
+    //ev_ref(EV_DEFAULT_UC);
+    printf("Leaving PollpriAsync\n");
     return(Undefined());
 }
 
 static int Pollpri(eio_req *req) {
     struct pollpri_request * pr = (struct pollpri_request *)req->data;
+    printf("Entered Pollpri\n");
     return(0);
 }
 
-static int PollpriAfter(eio_req *req) {
+//static int PollpriAfter(eio_req *req) {
+static void PollpriAfter(ev_io* req, int revents) {
+    printf("Entered PollpriAfter\n");
     HandleScope scope;
-    ev_unref(EV_DEFAULT_UC);
+    //ev_unref(EV_DEFAULT_UC);
     struct pollpri_request * pr = (struct pollpri_request *)req->data;
     Local<Value> argv[2];
     argv[0] = Local<Value>::New(Null());
     argv[1] = String::New(pr->path);
     pr->cb->Call(Context::GetCurrent()->Global(), 2, argv);
-    pr->cb.Dispose();
-    free(pr);
+    //pr->cb.Dispose();
+    //free(pr);
 }
 
 extern "C" void init(Handle<Object> target) {
diff --git a/bonescript/misctest.js b/bonescript/misctest.js
@@ -1,6 +1,6 @@
 var misc = require('./misc');
 
 console.log('Calling pollpri');
-misc.pollpri('my path', function(err, data) {
+misc.pollpri('/sys/class/gpio/gpio34/value', function(err, data) {
     console.log(''+data);
 });
