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ape/stdio: set errno to EMFILE when running out of streams

--- a/sys/src/ape/lib/ap/stdio/_IO_newfile.c

+++ b/sys/src/ape/lib/ap/stdio/_IO_newfile.c

@@ -5,6 +5,7 @@

 #define _PLAN9_SOURCE

 #include <lock.h>

+#include <errno.h>

 FILE *_IO_newfile(void)

 {

@@ -21,7 +22,9 @@

 	}

 	f = fx;

 	unlock(&fl);

-	if(f->state!=CLOSED)

+	if(f->state!=CLOSED){

+		errno = EMFILE;

 		return NULL;

+	}

 	return f;

 }

--- a/sys/src/ape/lib/ap/stdio/fdopen.c

+++ b/sys/src/ape/lib/ap/stdio/fdopen.c

@@ -2,6 +2,7 @@

  * Posix stdio -- fdopen

  */

 #include "iolib.h"

+#include <errno.h>

 /*

  * Open the named file with the given mode, using the given FILE

  * Legal modes are given below, `additional characters may follow these sequences':

@@ -15,12 +16,15 @@

 FILE *fdopen(const int fd, const char *mode){

 	FILE *f;

+	if(fd < 0){

+		errno = EBADF;

+		return NULL;

+	}

 	if((f = _IO_newfile()) == NULL)

 		return NULL;

 	f->fd=fd;

 	if(mode[0]=='a')

 		lseek(f->fd, 0L, 2);

-	if(f->fd==-1) return NULL;

 	f->flags=0;

 	f->state=OPEN;

 	f->buf=0;