fossil: import from plan 9

R=rsc https://codereview.appspot.com/7988047
2013-09-23 23:00:39 +02:00 · 2013-09-23 23:00:39 +02:00 · 6f4d00ee45
commit 6f4d00ee45
parent fea86f0639
50 changed files with 22325 additions and 0 deletions
--- a/src/cmd/fossil/9lstn.c
+++ b/src/cmd/fossil/9lstn.c
@ -0,0 +1,184 @@
+#include "stdinc.h"
+
+#include "9.h"
+
+typedef struct Lstn Lstn;
+struct Lstn {
+	int	afd;
+	int	flags;
+	char*	address;
+	char	dir[NETPATHLEN];
+
+	Lstn*	next;
+	Lstn*	prev;
+};
+
+static struct {
+	VtLock*	lock;
+
+	Lstn*	head;
+	Lstn*	tail;
+} lbox;
+
+static void
+lstnFree(Lstn* lstn)
+{
+	vtLock(lbox.lock);
+	if(lstn->prev != nil)
+		lstn->prev->next = lstn->next;
+	else
+		lbox.head = lstn->next;
+	if(lstn->next != nil)
+		lstn->next->prev = lstn->prev;
+	else
+		lbox.tail = lstn->prev;
+	vtUnlock(lbox.lock);
+
+	if(lstn->afd != -1)
+		close(lstn->afd);
+	vtMemFree(lstn->address);
+	vtMemFree(lstn);
+}
+
+static void
+lstnListen(void* a)
+{
+	Lstn *lstn;
+	int dfd, lfd;
+	char newdir[NETPATHLEN];
+	
+ 	vtThreadSetName("listen");
+
+	lstn = a;
+	for(;;){
+		if((lfd = listen(lstn->dir, newdir)) < 0){
+			fprint(2, "listen: listen '%s': %r", lstn->dir);
+			break;
+		}
+		if((dfd = accept(lfd, newdir)) >= 0)
+			conAlloc(dfd, newdir, lstn->flags);
+		else
+			fprint(2, "listen: accept %s: %r\n", newdir);
+		close(lfd);
+	}
+	lstnFree(lstn);
+}
+
+static Lstn*
+lstnAlloc(char* address, int flags)
+{
+	int afd;
+	Lstn *lstn;
+	char dir[NETPATHLEN];
+
+	vtLock(lbox.lock);
+	for(lstn = lbox.head; lstn != nil; lstn = lstn->next){
+		if(strcmp(lstn->address, address) != 0)
+			continue;
+		vtSetError("listen: already serving '%s'", address);
+		vtUnlock(lbox.lock);
+		return nil;
+	}
+
+	if((afd = announce(address, dir)) < 0){
+		vtSetError("listen: announce '%s': %r", address);
+		vtUnlock(lbox.lock);
+		return nil;
+	}
+
+	lstn = vtMemAllocZ(sizeof(Lstn));
+	lstn->afd = afd;
+	lstn->address = vtStrDup(address);
+	lstn->flags = flags;
+	memmove(lstn->dir, dir, NETPATHLEN);
+
+	if(lbox.tail != nil){
+		lstn->prev = lbox.tail;
+		lbox.tail->next = lstn;
+	}
+	else{
+		lbox.head = lstn;
+		lstn->prev = nil;
+	}
+	lbox.tail = lstn;
+	vtUnlock(lbox.lock);
+
+	if(vtThread(lstnListen, lstn) < 0){
+		vtSetError("listen: thread '%s': %r", lstn->address);
+		lstnFree(lstn);
+		return nil;
+	}
+
+	return lstn;
+}
+
+static int
+cmdLstn(int argc, char* argv[])
+{
+	int dflag, flags;
+	Lstn *lstn;
+	char *usage = "usage: listen [-dIN] [address]";
+
+	dflag = 0;
+	flags = 0;
+	ARGBEGIN{
+	default:
+		return cliError(usage);
+	case 'd':
+		dflag = 1;
+		break;
+	case 'I':
+		flags |= ConIPCheck;
+		break;
+	case 'N':
+		flags |= ConNoneAllow;
+		break;
+	}ARGEND
+
+	switch(argc){
+	default:
+		return cliError(usage);
+	case 0:
+		vtRLock(lbox.lock);
+		for(lstn = lbox.head; lstn != nil; lstn = lstn->next)
+			consPrint("\t%s\t%s\n", lstn->address, lstn->dir);
+		vtRUnlock(lbox.lock);
+		break;
+	case 1:
+		if(!dflag){
+			if(lstnAlloc(argv[0], flags) == nil)
+				return 0;
+			break;
+		}
+
+		vtLock(lbox.lock);
+		for(lstn = lbox.head; lstn != nil; lstn = lstn->next){
+			if(strcmp(lstn->address, argv[0]) != 0)
+				continue;
+			if(lstn->afd != -1){
+				close(lstn->afd);
+				lstn->afd = -1;
+			}
+			break;
+		}
+		vtUnlock(lbox.lock);
+
+		if(lstn == nil){
+			vtSetError("listen: '%s' not found", argv[0]);
+			return 0;
+		}
+		break;
+	}
+
+	return 1;
+}
+
+int
+lstnInit(void)
+{
+	lbox.lock = vtLockAlloc();
+
+	cliAddCmd("listen", cmdLstn);
+
+	return 1;
+}