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--- a/sys/include/ape/errno.h

+++ b/sys/include/ape/errno.h

@@ -13,6 +13,7 @@

 #define E2BIG	1

 #define EACCES	2

 #define	EAGAIN	3

+#define EWOULDBLOCK	3

 #define EBADF	4

 #define EBUSY	5

 #define ECHILD	6

--- a/sys/include/ape/time.h

+++ b/sys/include/ape/time.h

@@ -52,6 +52,12 @@

 #ifdef _POSIX_SOURCE

 extern void tzset(void);

+

+struct timespec {

+	time_t tv_sec;

+	long tv_nsec;

+};

+extern int nanosleep(const struct timespec *req, struct timespec *rem);

 #endif

 #ifdef __cplusplus

--- a/sys/src/ape/lib/ap/posix/mkfile

+++ b/sys/src/ape/lib/ap/posix/mkfile

@@ -10,6 +10,7 @@

 	sigset.$O\

 	sysconf.$O\

 	tzset.$O\

+	nanosleep.$O\

 </sys/src/cmd/mksyslib

--- /dev/null

+++ b/sys/src/ape/lib/ap/posix/nanosleep.c

@@ -1,0 +1,22 @@

+#define _PLAN9_SOURCE

+#include "../plan9/lib.h"

+#include <sys/types.h>

+#include <time.h>

+#include "../plan9/sys9.h"

+

+int

+nanosleep(struct timespec *req, struct timespec *rem)

+{

+	int ms;

+

+	ms = req->tv_sec * 1000 + (req->tv_nsec + 999999) / 1000000;

+	if(_SLEEP(ms) < 0) {

+		if(rem) {

+			rem->tv_sec = rem->tv_nsec = 0; /* needs better handling */

+		}

+		return -1;

+	}

+	if(rem)

+		rem->tv_sec = rem->tv_nsec = 0;

+	return 0;

+}