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getpid: use tos

--- a/sys/src/libc/9sys/getpid.c

+++ b/sys/src/libc/9sys/getpid.c

@@ -1,17 +1,9 @@

 #include	<u.h>

 #include	<libc.h>

+#include	<tos.h>

 int

 getpid(void)

 {

-	char b[20];

-	int f;

-

-	memset(b, 0, sizeof(b));

-	f = open("#c/pid", 0);

-	if(f >= 0) {

-		read(f, b, sizeof(b));

-		close(f);

-	}

-	return atol(b);

+	return _tos->pid;

 }

-- 

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