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ape/bsd/bind.c, ape/bsd/listen.c: Use _syserrno.

--- a/sys/src/ape/lib/bsd/bind.c

+++ b/sys/src/ape/lib/bsd/bind.c

@@ -61,7 +61,9 @@

 	n = write(cfd, msg, strlen(msg));

 	if(n < 0){

-		errno = EOPNOTSUPP;	/* Improve error reporting!!! */

+		_syserrno();

+		if(errno == EPLAN9)

+			errno = EOPNOTSUPP;

 		close(cfd);

 		return -1;

 	}

--- a/sys/src/ape/lib/bsd/listen.c

+++ b/sys/src/ape/lib/bsd/listen.c

@@ -143,7 +143,9 @@

 		_sock_inaddr2string(r, msg + 9, sizeof msg - 9);

 		n = write(cfd, msg, strlen(msg));

 		if(n < 0){

-			errno = EOPNOTSUPP;	/* Improve error reporting!!! */

+			_syserrno();

+			if(errno == EPLAN9)

+				errno = EOPNOTSUPP;

 			close(cfd);

 			return -1;

 		}